Maintenance & Safety Manual for Saw Chain, Guide Bars, and Drive Sprockets O ® ★ CE 194 ★ IN S S IN 7 ★ REGON ® ★ ★★ ★★ ★ ★★ ★ ★ ★ Maintenance and Safety Manual 7 REGON Oregon ® Maintenance & Safety Manual O Saw Chain, Guide Bar and Drive Sprocket CE 194 Blount, Inc. Oregon Cutting Systems Group 4909 S.E. International Way (97222-4607) P.O. Box 22127 • Portland, Oregon • 97269-2127 (503) 653-4706 www.oregonchain.com Oregon Distribution Ltd.
Chainsaw Safety IMPORTANT SAFETY MESSAGE SAFETY SYMBOL: This safety symbol is used to highlight safety messages. When you see this symbol, read and follow the safety message to avoid severe personal injury. There is a risk of serious injury to the saw operator or bystanders. All cutting chain can kick back, which can lead to dangerous loss of control of the chainsaw and result in serious injury to the saw operator or bystanders.
Chainsaw Safety WHAT IS KICKBACK? Kickback is the violent backward and/or upward motion of the chainsaw guide bar occurring when the chain near the nose or tip of the guide bar contacts any object, such as another log or branch, or when the wood closes in and pinches the saw chain in the cut. BE AWARE OF KICKBACK 1. Be alert at all times to guard against a possible kickback reaction. Always be POTENTIAL KICKBACK SITUATION aware of the position of your bar’s nose. 2.
Chainsaw Safety, (Continued) MAKE PROPER WORK PRACTICES A HABIT Use only a righthanded grip to hold your saw (right hand on the trigger, left hand on the front handle). Keep your left arm straight for better control. Hold saw firmly with both hands. Keep thumb firmly locked under front handle. Stand to the side of the chainsaw, never behind it. Run engine at full throttle. Use low-kickback saw chain and a reduced-kickback guide bar.
Introduction/Contents Your chainsaw is only as good as your chain, guide bar, and sprocket. They function as a team while cutting wood and must be maintained as a team. A properly maintained chain, bar, and sprocket will provide excellent cutting performance. An improperly maintained chain will cause damage to the bar and sprocket, will cut poorly, and will create potential safety hazards. This manual addresses the maintenance of only Oregon® manufactured chains, bars, and sprockets.
2 The Four Oregon® Saw End-Use Chain Symbols Each of these four symbols represents a generalized category of chain saw use. Oregon® chains are listed in this manual under one or more of these symbols, generally indicating the type of use for which the product is intended.
The Five Oregon® Symbols Chain for Periodic Saw Maintenance 3 To keep your cutting system of chain, bar, and sprocket working at peak efficiency - and to minimize wear - there are a number of things every user should do periodically. There are specific maintenance tasks that should be performed and there are more general “common-sense” things to do, some of which need to occur with greater frequency, some with lesser frequency. And there are some things you should never do.
Saw Chain 4 OREGON® CHAIN TERMS CHAIN PITCH Chain pitch is the distance between any three consecutive rivets, divided by two. Oregon® chain pitches are: 1/4," .325", 3/8," .404," and 3/4." ÷2 CHAIN GAUGE Chain gauge is the drive link’s thickness where it fits into the guide-bar groove. The industry standard for gauges is: .043," .050," .058" and .063." Oregon® chain gauges of .063," .080" and .122" are used for Harvester applications.
Saw Chain 5 OREGON® CHAIN TERMS (CONTINUED) THE PARTS OF A SAW CHAIN NOTE Parts below named in Bold Face indicate kick- back-reducing links and features: bumper tie straps, bumper drive links, and ramped depth gauges.
6 Saw Chain OREGON® CHAIN-MAINTENANCE TOOLS FILING TOOLS 햲 ASSEMBLED FILE GUIDE *Asst’d. P/N’s 햴 ROUND FILE *Asst’d. P/N’s 햷 SHARPENING KITS 햳 *Asst’d. P/N’s 햵 DEPTH-GAUGE 햶 TOOLS FLAT FILE P/N 12211 햸 BAR-MOUNT FILING GUIDE P/N 23736A *Asst’d. P/N’s FILE HANDLE P/N 30870B (100 CT.) *See pages 35-63 for part numbers, file sizes, and other help selecting the right tools for your Oregon® chain.
Saw Chain 7 OREGON® CHAIN-MAINTENANCE TOOLS GRINDERS SURE SHARP® 12-VOLT GRINDER P/N 28588 BENCH-MODEL CHAIN GRINDER P/N 511A GRINDING WHEELS FOR 511A GRINDER *Asst’d. P/N’s See page 8 MINI GRINDER P/N 108181 BAR-MOUNTED CHAIN GRINDER P/N 109178 (12 V) P/N 109176 (115 V) GRINDING WHEELS FOR MINI GRINDER & BAR-MOUNTED GRINDERS *Asst’d.
8 Saw Chain 511-A GRINDER WHEELS GRINDING WHEEL PART NUMBER GRINDING WHEEL WIDTH CORRESPONDS TO FILE SIZE DIAMETER(S) OR534-18 OR534-316 OR534-516 1/8" 3/16" 5/16" 5/32" or 4.5mm 3/16" or 7/32" 5/16" MINI GRINDER AND BAR-MOUNTED CHAIN GRINDER WHEELS GRINDING WHEEL PART NUMBER GRINDING WHEEL WIDTH CORRESPONDS TO FILE SIZE DIAMETER(S) OR4125-18 OR4125-316 1/8" 3/16" 5/32" or 4.
Saw Chain 9 CHAIN IDENTIFICATION OREGON® CHAIN PART NUMBER FILING OREGON® CHAIN SPEC’S CHAIN GAUGE TYPE CUTTER TYPE END VIEW CUTTER KICKBACKSEQUENCE REDUCING SIDE FEATURES VIEW (IF ANY) * 1/4" – PITCH CHAIN 25AP PAGE .050" MICRO CHISEL STANDARD MICRO CHISEL® .050" .058" .063" MICRO CHISEL® STANDARD 20LP, M20LP PAGE 21LP, M21LP 22LP, M22LP SUPER 20 .050" .058" .063" CHISEL STANDARD 33LG 34LG 35LG PAGE SUPER GUARD® .050" .058" .063" CHISEL STANDARD 33SL 34SL 35SL PAGE PRO GUARD™ .
10 Saw Chain CHAIN IDENTIFICATION (CONTINUED) OREGON® CHAIN PART NUMBER FILING OREGON® CHAIN CUTTER TYPE SPEC’S CHAIN GAUGE END SIDE TYPE VIEW VIEW CUTTER KICKBACKSEQUENCE REDUCING FEATURES (IF ANY) 3/8" – PITCH CHAIN (CONTINUED) 72DG,DJ 73DG 75DG PAGE SPEED GUARD™ .050" .058" .063" SEMI-CHISEL (DG) ST’D. (DJ) SKIP 72JG,LG 73JG,LG 75JG,LG PAGE SUPER GUARD® .050" .058" .063" CHISEL (JG) SKIP (LG) ST’D. 72JP,LP,M72LP PAGE SUPER 70 .050" .058" 73JP,LP,M73LP 75LP,M75LP .
Saw Chain 11 CHAIN IDENTIFICATION (CONTINUED) OREGON® FILING OREGON® CHAIN CUTTER TYPE CHAIN SPEC’S CHAIN GAUGE END SIDE PART TYPE VIEW VIEW NUMBER CUTTER KICKBACKSEQUENCE REDUCING FEATURES (IF ANY) .404" – PITCH CHAIN 16H 18H PAGE 26, 26P 27, 27A 27P PAGE 61 54 HARVESTER .063" .080" MICRO CHISEL® STANDARD MICRO CHISEL® .058" .
12 Saw Chain CHAIN DRIVE-LINK NUMBER IDENTIFICATION Nearly all Oregon® chains are named by a part number made up of a number (see below), and letters (see pages 13-14). Oregon® Part-number Examples: 27A, 72LP, 91VG, M72LP 27 A, 72 LP, 91 VG, M 72 LP First, note the numbers: These numbers are stamped on the chain’s drive links and indicate the physical size of the chain (pitch and gauge). ÷2 72 CHAIN NUMBER 11 16 18 20 21 22 25 27 33 34 35 50 51 52 58 59 72 73 75 90 91 95 PITCH GAUGE 3/4" .
Saw Chain 13 CHAIN LETTER IDENTIFICATION The Letters: 27 A , 72 LP , 91 VG , M 72 LP The letters represent cutter type and sequence, kickback-reducing features, or other physical traits of the chain.
14 Saw Chain CHAIN LETTER IDENTIFICATION (CONTINUED) JG Round-ground chisel cutters with ramped depth gauges, bumper tie straps and skip sequence Round-ground chisel JP cutters with bumper drive links and skip sequence L Chisel cutters with standard sequence LG Round-ground chisel cutters with ramped depth gauges and standard sequence (33LG is a low vibration chain) LP Low-vibration, round ground chisel cutters with bumper drive links and standard sequence LX Power Sharp chain with ramp
Saw Chain 15 THE FOUR BASIC SAW-CHAIN RULES ATTENTION CHAINSAW USERS: Oregon® urges you to become familiar with the four basic saw-chain rules. Users who know and follow these rules can count on superior performance from their chain, bar, and sprocket – and – reduce safety hazards at the same time. RULE NUMBER 1 YOUR CHAIN MUST BE CORRECTLY TENSIONED More chain and bar problems are caused by incorrect chain tension than by any other single factor. See pages 18-21 on how to tension your chain.
16 Saw Chain RULE NUMBER 3 YOUR CHAIN MUST BE SHARP When your chain is sharp, it does the work. When it’s not, you do the work – and your cutting attachments will wear more rapidly. See pages 22-26 for instructions on how to sharpen your chain. See pages 35-63 to find maintenance specifications for each Oregon® chain type. RULE NUMBER 4 YOUR CHAIN’S DEPTH GAUGES MUST BE SET CORRECTLY Depth-gauge setting and depth-gauge shape are critical to performance and safety.
Saw Chain 17 HOW TO MAINTAIN CHAIN ATTENTION: Oregon® urges dealers, chainsaw users, and anyone who services saw chain to become familiar with proper chain-maintenance techniques and the possible dangers which can result if chain is not properly maintained. WARNING Failure to follow the instructions below can result in severe injury to the saw operator, bystanders, or the person performing maintenance. Always turn off your saw’s engine before handling the chain, guide bar or sprocket.
18 Saw Chain HOW TO TENSION YOUR CHAIN Basic Chain-Tensioning Tasks ▲ Before use ■ Often ● Daily ◆ Weekly Never ▲ Tension chain before each use ■ Tension chain often, or at each refueling Never tension your chain right after cutting. Chain tensioned while hot can cool and shrink, causing tension to be too tight. Let chain cool first. R EAD THE WARNING ON PAGE 17. NOTE Always wear protective gloves. 1. Turn the engine off. 2. Loosen barmounting nuts on the side of your saw. 3.
Saw Chain 19 HOW TO TENSION YOUR CHAIN (3a CONTINUED) Turn your saw’s tension-adjustment screw until the bottoms of the lowest tie straps and cutters come up and just touch the bottom of the bar rail. While still holding the nose up, tighten your saw’s rear barmounting nut first, then tighten the front mounting nut. 3b. I F YOU HAVE A STANDARD SPROCKET- NOSE BAR Pull the bar nose up, and keep it up as you adjust tension. Tension must be tighter on a sprocket-nose bar than on a solid-nose bar.
20 Saw Chain HOW TO TENSION YOUR CHAIN (CONTINUED) 3c. I F YOU HAVE AN INTENZ ® SPROCKET- NOSE BAR Turn the tension-adjust slot until the bottoms of the lowest cutters and tie straps come up and solidly contact the bottom of the bar rail. Tighten your saw’s rear bar-mounting nut first, then tighten the front mounting nut. It is not necessary to hold the nose up when adjusting tension on Intenz® bars. NOTE When replacing a standard bar with an Intenz® bar, the saw's adjustment pin must be removed.
Saw Chain 21 5. Check tension often during operation, especially during the first half-hour. If chain loosens: stop, let chain cool, and readjust tension. HOW TO LUBRICATE YOUR CHAIN Basic Lubrication Tasks ▲ Before use ■ Often ● Daily ◆ Weekly Never ▲ Each time you fill your gas tank, fill your oil reservoir with clean bar-and-chain oil. ■ Be sure your chain, bar, and sprocket are always receiving oil from the saw during operation.
22 Saw Chain HOW TO SHARPEN CHAIN Basic Sharpening Tasks ▲ Before use ■ Often ● Daily ◆ Weekly Never ▲ Sharpen chain before each use. ■ Sharpen chain often, or as needed. R EAD THE WARNING ON PAGE 17. NOTES Sharpening your chain while it is on the saw requires proper chain tension, as shown on pages 18-21 prior to filing. Pages 35-63 show the correct maintenance specifications and the correct maintenance-tool part numbers for each of the Oregon® chain types.
Saw Chain 23 • Abnormal chain wear. • Wear patterns on the chain that may indicate a worn bar or sprocket. • Loose rivets (if you can rotate the rivets with your fingers, they’re too loose). 4. Use the correct sharpening specifications for your Oregon® chain type. See pages 35-63. • If unsure of your Oregon® chain's type, or part number, ask your Oregon® chain dealer. • For Sharpening Chain with a Grinder see below. • For Sharpening Chain with a Round File see pages 25-26. 5.
24 Saw Chain 2. To set the proper grinder head angle, use the recommended top-plate cutting angle (See pages 35-63 for correct angles for each Oregon® chain type.) 3. Dress vitrified grinding wheels often to maintain correct shape (see illustration). Use either a rotary wheel dresser or a dressing brick. Full Radius, for all round-ground chains except 11H For 11H Chain Only: 3/16" Partial Radius & 1/8” Flat NOTE: • To avoid burning cutters, use light intermittent strokes.
Saw Chain 25 SHARPENING WITH A ROUND FILE 1. Be sure 1/5th, or 20%, of the file’s diameter is always held above the cutter’s top plate. The best way to do this is with an Oregon® File Guide. The file guide automatically keeps 20% of the file's diameter above the cutter's top plate.. = 1/5th or 20% above top plate 2. Keep the correct Top-plate Filing Angle line on your file guide parallel with your chain. 3. Sharpen cutters on one side of the chain first.
26 Saw Chain 5. Keep all cutter lengths equal. A B A=B HOW TO SET DEPTH GAUGES Basic Depth-Gauge Tasks ▲ Before use ■ Often ● Daily ◆ Weekly Never ■ Set depth gauges often, every 3 or 4 sharpenings, or more often if needed. R EAD THE WARNING ON PAGE 17. NOTES Setting your depth gauges while the chain is on the saw requires proper chain tension, as shown on pages 18-21 prior to filing.
Saw Chain 27 HOW TO SET DEPTH GAUGES (CONTINUED) Most Oregon® chains have a number stamped on each depth gauge indicating the correct depth-gauge setting. EXAMPLE: .025" 25 .025" DEPTHGAUGE SETTING ■1. Use a depth-gauge tool with the correct built-in setting for your chain and check your depth gauges every 3 or 4 sharpenings or more often if needed. 2. Be sure the heel and toe of the cutter are both down, resting on the bar rail, before any filing is done.
28 Saw Chain HOW TO SET DEPTH GAUGES (CONTINUED) 4. If the depth gauge extends above the slot, file the depth gauge down level with the top of the tool using a flat file. Never file the depth gauge down so far that you exceed the depth-gauge setting specified in this manual for your Oregon® chain. Do not file or alter the tops of kickback-reducing bumper tie straps or bumper drive links, except on 33SL, 34SL, and 35SL chains. Only 33SL, 34SL, and 35SL require filing of the bumper tie straps.
Saw Chain 29 ** **Do not round off the depth gauges on Vanguard chain after filing them down. NOTE On many chains, it may be helpful to tip the depth-gauge tool on end and place it in front of the cutting corner in order to protect the cutting surfaces when rounding off depth gauges. SETTING THE WIDE-TRACK DEPTH GAUGES ON VANGUARD CHAIN Most experienced timber cutters know that if their newly-sharpened chain fails to cut, then the next step is to check and probably lower the depth gauges.
30 Saw Chain 3. The area where depth-gauge filing occurs on Vanguard chain is identified by a witness mark. Do not file outside the witness mark and do not round off Vanguard depth gauges after lowering them. 3. Always file Vanguard depth gauges from the inside out. HOW TO INSTALL NEW CHAIN PARTS R EAD THE WARNING ON PAGE 17. NOTE Use only new Oregon® parts to repair Oregon® chain. And only use parts which are the correct size and type for your chain. 1.
Saw Chain 31 3. Place the preset tie strap on a flat outer surface of a chain-breaker anvil. Be sure the rivets are pointing up. 4. Assemble chain to the preset tie strap. 5. Assemble tie strap with dot, or LubrilinkTM contour face up, and the notch toward the drive-link tangs. Assemble bumper tie strap in the correct direction, with the notch toward the drive-link tangs. 6. Be sure parts are assembled in the correct location, sequence and direction. Check the illustrations on pages 4 and 5.
32 Saw Chain HOW TO BREAK OUT RIVETS CAUTION Always wear approved safety accessories for hands and face when breaking out rivets. 1. Place the chain segment you wish to break in the correct slot of the anvil, according to pitch. NOTE For Vanguard OK NO chain cutters with wide-track depth gauges, be sure that the depth gauge curls downward, into the recessed area of the anvil. 2. Position rivet head directly under the punch.
Saw Chain 33 HOW TO BREAK OUT RIVETS (CONTINUED) REMOVING RIVETS FROM BROKEN DRIVE LINKS 1. When removing rivets from broken drive links, hold the two broken segments together in their original (unbroken) positions as you place the chain link in the anvil. 2. Perform steps 1 and 2 from “How to Break Out Rivets.” on the previous page.
34 Saw Chain HOW TO BREAK IN A NEW CHAIN Basic Break-In Tasks ▲ Before use ■ Often ● Daily ◆ Weekly Never The life of your new chain can be extended by taking these few simple steps before using it. ▲1. Before the first use, soak the chain overnight to allow oil to penetrate all chain components. ▲ 2.Run new chain at half throttle for several minutes before doing any cutting in order to allow oil to reach all parts of the bar and chain. Let sprocket, bar, and chain warm up fully. ■ 3.
Micro Chisel® 1/4" 35 MICRO CHISEL® Kickback Reducing Features Not a Lowkickback Chain FILING 햲 End View Use Chain Type Gauge 25AP .050" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 85° 30° 10° TOOLS FOR FILING Part No. 70504 37534 22290 OR534-18 OR4125-18 Description 5/32" Round File (12-Pack) 5/32" Assembled File Guide .025" Depth-gauge Tool 1/8" Grinding Wheel, 5-3/4" Dia. 1/8" Grinding Wheel, 4-1/8" Dia.
36 Micro Chisel® .325" MICRO CHISEL® Kickback Reducing Features Not a Lowkickback Chain Low-vibration Chain End View Use Chain Type Gauge 20BP 21BP 22BP .050" .058" .063" FILING 햲 DEPTH-GAUGE SETTING 햳 TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 85° 30° TOOLS FOR FILING Part No. 70503 31690 31941 OR534-316 OR4125-316 10° Description 3/16" Round File (12-Pack) 3/16" Assembled File Guide .
Super 20 .325" 37 CHISEL® Kickback Reducing Features Not a Lowkickback Chain Low-vibration Chain FILING 햲 End View Use Chain Type Gauge 20LP, M20LP 21LP, M21LP 22LP, M22LP .050" .058" .063" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 25° 10° TOOLS FOR FILING Part No. 70503 31690 31941 OR534-316 OR4125-316 Description 3/16" Round File (12-Pack) 3/16" Assembled File Guide .
38 Super Guard® .325" CHISEL® Kickback Reducing Features End View Not a LowChain Type kickback Chain 33LG No Bumper 34LG Tie Straps 35LG Low-vibration Chain FILING 햲 DEPTH-GAUGE SETTING 햳 Use Gauge .050" .058" .063" TOP-PLATE CUTTING ANGLE 60° .025" HEEL DOWN 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 25° TOOLS FOR FILING Part No. 70511 31692 31941 OR534-18 OR4125-18 10° Description 4.5 mm Round File (12-Pack) 4.5 mm Assembled File Guide .
Pro Guard™ .325" 39 CHISEL® Kickback Reducing Features End View A LowChain Type kickback Chain 33SL With Bumper 34SL Tie Straps 35SL Low-vibration Chain FILING 햲 DEPTH-GAUGE/BUMPER TIE STRAP SETTING 햳 Use Gauge .050" .058" .063" TOP-PLATE CUTTING ANGLE Depth gauge setting includes cutter depth gauge and bumper tie strap. 햴 60° 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 25° TOOLS FOR FILING Part No. 70511 31692 31941 OR534-18 OR4125-18 10° Description 4.
40 Micro-Lite™ .325" MICRO CHISEL® Kickback Reducing Features A Low-kickback Chain Low-vibration Chain Narrow-kerf Chain FILING 햲 End View Use Chain Type Gauge 95VP .050" DEPTH-GAUGE SETTING 햳 TOP-PLATE CUTTING ANGLE 60° .025" HEEL DOWN 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 80° 30° TOOLS FOR FILING Part No. 70503 31690 31941 OR534-316 OR4125-316 10° Description 3/16" Round File (12-Pack) 3/16" Assembled File Guide .
Ripping Chain .325" 41 MICRO CHISEL® End View Not a LowChain Type kickback Chain 95R (Micro-Lite ) Narrow-kerf Chain Low-vibration Chain Gauge .050" TM FILING 햲 DEPTH-GAUGE SETTING 햳 Use TOP-PLATE CUTTING ANGLE 50° .030" HEEL DOWN 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 75° 90° 5° TOOLS FOR FILING Part No. 70503 22291 OR534-316 OR4125-316 Description 3/16" Round File (12-Pack) .030" Depth-gauge Tool 3/16" Grinding Wheel, 5-3/4" Dia.
42 Oregon® Vanguard 3/8" OREGON® VANGUARD Kickback Reducing Features Chain Type Gauge 72V 73V 75V .050" .058" .063" Low-kickback Performance Low-vibration Chain FILING 햲 DEPTH-GAUGE SETTING End View 햳 Use TOP-PLATE CUTTING ANGLE 60° .025" HEEL DOWN 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 10° 25° TOOLS FOR FILING Part No. 70502 31686 31941 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .
S-70 3/8" 43 SEMI CHISEL Kickback Reducing Features Not a Lowkickback Chain FILING 햲 End View Use Chain Type Gauge 72AP, 72DP 73DP 75DP .050" .058" .063" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 85° 90° 35° TOOLS FOR FILING Part No. 70502 31686 22290 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .025" Depth-gauge Tool 3/16" Grinding Wheel, 5-3/4" Dia.
44 Speed Guard™ 3/8" SEMI CHISEL Kickback Reducing Features Not a Lowkickback Chain End View Use Chain Type Gauge 72DG*, 72DJ* 73DG* 75DG* .050" .058" .063" *Recently obsoleted Oregon® chain part numbers FILING 햲 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .030" 햴 햵 SIDE-PLATE ANGLE 85° TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 30° 90° TOOLS FOR FILING Part No. 70503 31690 22291 OR534-316 OR4125-316 Description 3/16" Round File (12-Pack) 3/16" Assembled File Guide .
Super Guard® 3/8" 45 CHISEL Kickback Reducing Features Not a Lowkickback Chain FILING 햲 End View Use Chain Type Gauge 72JG, 72LG 73JG, 73LG 75JG, 75LG .050" .058" .063" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 10° 25° TOOLS FOR FILING Part No. 70502 31686 22290 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .
46 Super 70 3/8" CHISEL Kickback Reducing Features Not a Lowkickback Chain Low-vibration Chain End View Use Chain Type Gauge 72JP, 72LP, M72LP 73JP, 73LP, M73LP 75LP, M75LP .050" .058" .063" FILING 햲 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 10° 25° TOOLS FOR FILING Part No. 70502 31686 31941 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .
XtraGUARD® 3/8" 47 SEMI CHISEL Kickback Reducing Features A Lowkickback Chain With Bumper Tie Straps End View Use Chain Type Gauge 72SG* 73SG* 75SG* .050" .058" .063" *Recently obsoleted Oregon® chain part numbers FILING 햲 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .030" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 85° 30° 90° TOOLS FOR FILING Part No. 70503 31690 22291 OR534-316 OR4125-316 Description 3/16" Round File (12-Pack) 3/16" Assembled File Guide .
48 Square-Ground Chain 3/8" CHISEL Kickback Reducing Features Not a Lowkickback Chain FILING 햲 End View Chain Type Gauge 72CJ, 72CJX, 72CK, 72CKX, 72CL, 72CLX .050" 75CJ, 75CJX, 75CK, 75CKX, 75CL, 75CLX .063" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 40°-50° .025" 햴 햵 SIDE-PLATE ANGLE Use TOP-PLATE FILING ANGLE 햶 GULLET FILING (SEE PAGE 66) 90° 15° TOOLS FOR FILING Part No. 22290 12211 Description .
Ripping Chain 3/8" 49 SEMI CHISEL Kickback Reducing Features Not a Lowkickback Chain FILING 햲 End View Use Chain Type Gauge 72RD 73RD 75RD .050" .058" .063" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 50° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 75° 10°-15° TOOLS FOR FILING Part No. 70502 22290 OR534-316 OR4125-316 10° Description 7/32" Round File (12-Pack) .025" Depth-gauge Tool 3/16" Grinding Wheel, 5-3/4" Dia. 3/16" Grinding Wheel, 4-1/8" Dia.
50 Micro-liteTM 3/8" CHAMFER CHISEL Kickback Reducing Features A Low-kickback Chain Use Chain Type Gauge 90SG .043" With Bumper Tie Straps Low-vibration Chain Narrow-kerf Chain FILING 햲 End View DEPTH-GAUGE SETTING 햳 TOP-PLATE CUTTING ANGLE .025" 50° HEEL DOWN 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 75° 90° 30° TOOLS FOR FILING Part No. 70511 31692 31941 OR534-18 OR4125-18 Description 4.5mm Round File (12-Pack) 4.5mm Assembled File Guide .
XtraGUARD® 3/8" 51 CHAMFER CHISEL Kickback Reducing Features A Lowkickback Chain With Bumper Drive Links FILING End View Use Chain Type Gauge 91P .050" DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE FILE-GUIDE ANGLE 80° 90° 30° TOOLS FOR FILING Part No. 70504 37534 31941 OR534-18 OR4125-18 Description 5/32" Round File (12-Pack) 5/32" Assembled File Guide .025" Drop-Center Depth-gauge Tool 1/8" Grinding Wheel, 5-3/4" Dia.
52 Low Profile 3/8" CHAMFER CHISEL Kickback Reducing Features End View Not a LowChain Type kickback Chain 91VS, M91VS No Bumper Tie Straps Low-vibration Chain FILING DEPTH-GAUGE SETTING Use Gauge .050" TOP-PLATE CUTTING ANGLE 60° .025" SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE FILE-GUIDE ANGLE 80° 90° 30° TOOLS FOR FILING Part No. 70504 37534 31941 OR534-18 OR4125-18 Description 5/32" Round File (12-Pack) 5/32" Assembled File Guide .
XtraGUARD® 3/8" 53 CHAMFER CHISEL Kickback Reducing Features End View A LowChain Type kickback Chain 91VG With Bumper Tie Straps Low-vibration Chain FILING DEPTH-GAUGE SETTING Use Gauge .050" TOP-PLATE CUTTING ANGLE 60° .025" SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE FILE-GUIDE ANGLE 80° 90° 30° TOOLS FOR FILING Part No. 70504 37534 31941 OR534-18 OR4125-18 Description 5/32" Round File (12-Pack) 5/32" Assembled File Guide .
54 Micro Chisel® .404" MICRO CHISEL Kickback Reducing Features End View Use 26P, 27P 26, 27, 27A Not a Lowkickback Chain FILING 햲 Chain Type Gauge 26, 26P 27, 27A, 27P .058" .063" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .030" 햴 SIDE-PLATE ANGLE 햵 TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 80° 10° 35° TOOLS FOR FILING Part No. 70502 31686 22291 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .
Ripping Chain .404" 55 MICRO CHISEL End View Not a Lowkickback Chain FILING 햲 Chain Type Gauge 27R 27RA (skip) .063" .063" 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 50° .030" 햴 햵 SIDE-PLATE ANGLE Use TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 75° 10°-15° TOOLS FOR FILING Part No. 70502 22291 OR534-316 OR4125-316 10° Description 7/32" Round File (12-Pack) .030" Depth-gauge Tool 3/16" Grinding Wheel, 5-3/4" Dia. 3/16" Grinding Wheel, 4-1/8" Dia.
56 Super Chisel™ .404" CHISEL Kickback Reducing Features Not a Lowkickback Chain End View Use Chain Type Gauge 50L* 51L* 52L* .050" .058" .063" *Recently obsoleted Oregon® chain part numbers FILING 햲 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 25° TOOLS FOR FILING Part No. 70502 31686 22290 OR534-316 OR4125-316 10° Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .
Micro-Bit® .404" 57 CHIPPER Kickback Reducing Features Not a Lowkickback Chain End View Use Chain Type Gauge 58CP* 59CP* .058" .063" *Recently obsoleted Oregon® chain part numbers FILING 햲 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .030" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 90° 10° 35° TOOLS FOR FILING Part No. 70502 31686 22291 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .
58 Super Guard® .404" CHISEL Kickback Reducing Features Not a Lowkickback Chain End View Use Chain Type Gauge 58J, 58L, 58LG* 59J, 59L, 59JG*, 59LG* .058" .063" *Recently obsoleted Oregon® chain part numbers FILING 햲 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 60° 25° TOOLS FOR FILING Part No.
Square-Ground Chain .404" 59 CHISEL Kickback Reducing Features Not a Lowkickback Chain End View Use Chain Type Gauge 50AJ*, 50AL* 58CJ, 58CL, 51AJ*, 51AL* 59CJ, 59CK, 59CL, 52AJ*, 52AK*, 52AL* .050" .058" .063" *Recently obsoleted Oregon® chain part numbers FILING 햲 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 40°-50° .025" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 GULLET FILING (SEE PAGE 66) 85° 15° TOOLS FOR FILING Part No. 22290 12211 Description .
60 Harvester Chain .404" CHIPPER Kickback Reducing Features Use Chain Type Gauge 59AA .063" Harvester, no hand-held applications FILING 햲 End View 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .030" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 90° 10° 35° TOOLS FOR FILING Part No. 70502 31686 22291 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .030" Depth-gauge Tool 3/16" Grinding Wheel, 5-3/4" Dia.
Harvester Chain .404" 61 MICRO CHISEL® Kickback Reducing Features Use Chain Type Gauge 16H 18H .063" .080" Harvester, no hand-held applications FILING 햲 End View 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .050" 햴 SIDE-PLATE ANGLE 햵 TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 80° 10° 35° TOOLS FOR FILING Part No. 70502 31686 38850 OR534-316 OR4125-316 Description 7/32" Round File (12-Pack) 7/32" Assembled File Guide .050" Depth-gauge Tool 3/16" Grinding Wheel, 5-3/4" Dia.
62 Harvester Chain 3/4" CHIPPER Kickback Reducing Features Use Chain Type Gauge 11BC .122" Harvester, no hand-held applications FILING 햲 End View 햳 DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 60° .060" 햴 햵 SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE 햶 FILE-GUIDE ANGLE 85° 35° TOOLS FOR FILING Part No. 90410 26800 OR534-516 90° Description 5/16" Round File (6-Pack) .060" Depth-gauge Tool 5/16" Grinding Wheel, 5-3/4" Dia. WARNING For use on mechanized harvesting equipment only.
Harvester Chain 3/4" 63 SEMI CHISEL Kickback Reducing Features Use Chain Type Gauge 11H .122" Harvester, no hand-held applications FILING End View DEPTH-GAUGE SETTING TOP-PLATE CUTTING ANGLE 50° .070" SIDE-PLATE ANGLE TOP-PLATE FILING ANGLE FILE-GUIDE ANGLE 80° 30° TOOLS FOR FILING Part No. 90410 107617 107529 OR534-516 90° Description 5/16" Round File (6-Pack) 5/16” Assembled 11H File Guide .070" Depth-gauge Tool 5/16" Grinding Wheel, 5-3/4" Dia.
64 Square-Ground Filing WHO SHOULD PERFORM SQUARE GROUND FILING? Most chainsaw users will probably never need to use square ground chain, nor learn to perform squareground filing. But in areas where the timber is larger and the guide bars used are longer, the performance advantages of square-ground chain can outweigh the fact that square-ground filing is more difficult and much less forgiving of filing errors. FILE POSITIONING The file will sharpen the top plate, and the side plate, simultaneously.
Square-Ground Filing 65 FILE DIRECTION Oregon® recommends that square-ground chain be filed from the outside in (in a downward direction). This leaves a better edge on the chromed cutting surfaces and makes it DOWNWARD FILING easier to keep the file’s posiDIRECTION tion, and the resulting cutting edges, in correct alignment as shown in the preceding “File Positioning” section. However, filing from the outside in will wear out your file faster.
66 Square-Ground Filing GULLET FILING Approximately every 5th sharpening, clean out gullets by filing them back with a 7/32" round file. File gullets from the inside out (the side opposite from sharpening). Always leave a 1/8" shelf behind the gullet. BEFORE AFTER If not cleaned out regularly, the outer edge of your gullets will eventually prevent the working corners of your cutters from getting an adequate bite into the wood.
Saw Chain 67 SAW CHAIN TROUBLESHOOTING Most chain problems are caused by three things: incorrect chain tension, incorrect filing, and lack of lubrication. Look closely at your chain’s cutters, and compare them to the following illustrations. See the following pages for “Remedies” to these problems. PROBLEM Chain cuts slow, cuts rough, or won’t hold an edge 햲 햳 햴 Light abrasive damage Severe abrasive Abrasive or impact on side plates. damage on side plates. damage to the top Remedy: See A.
68 Saw Chain SAW-CHAIN TROUBLESHOOTING (CONTINUED) Low depth gauges. Remedy: See E. High depth gauges. Remedy: See F. Square or blunt depth gauges. Remedy: See G. REMEDIES A. File cutters back until all damage is removed. This remedy applies to pictures , and . B. Resharpen cutters while holding your file at the correct top-plate filing angle for your chain. Be sure your file guide is stamped with your chain’s correct top-plate angle. This remedy applies to pictures and . C.
Saw Chain 69 SAW-CHAIN TROUBLESHOOTING (CONTINUED) PROBLEM Cutters and/or tie straps wear heavily or break Excessive heel wear on cutters and opposite tie straps. Remedy: See H. Cracks under rear rivet Tie straps broken holes on cutters and in the center. opposite tie straps. Remedy: See I. Remedy: See H. Bottoms of tie straps and cutters worn out of square. Remedy: See J. REMEDIES H. Replace worn or cracked cutters and/or tie straps.
70 Saw Chain SAW-CHAIN TROUBLESHOOTING (CONTINUED) REMEDIES (CONTINUED) J. Dress the tops of the guide bar’s rails square. If wear is minor, file the bottoms of tie straps and cutters square. If wear is extensive, replace the chain. This remedy applies to picture . PROBLEM Drive links wear heavily or break Straight bottoms. Remedy: See K. Concave bottoms. Remedy: See K. Battered and broken bottoms. Remedy: See L. 21 22 Peening in front or back. Remedy: See M.
Saw Chain 71 SAW-CHAIN TROUBLESHOOTING (CONTINUED) REMEDIES: (K-P) K. Check your guide bar (grooves in bar’s body or nose have worn too shallow), and check your rim or spur drive sprocket (excessive wear is allowing drive links to bottom out). Replace bar, sprocket, or both. Sharpen drive-link tangs, as shown in the illustration on page 72, if possible. If not, replace the chain. This remedy applies to pictures and . L. Maintain proper tension to prevent chain from climbing out of spur drive sprocket.
72 Saw Chain SAW-CHAIN TROUBLESHOOTING (CONTINUED) SHARPENING DRIVE-LINK TANGS Pointed drive-link tangs help remove chips and debris from your bar groove. Sharpen damaged tangs back to original shape with a round file. PROBLEM Chain has tight joints Tight joints are caused by either: loose tension, or an overworn drive sprocket. Look closely at your chain’s chassis. 24 Peening on bottoms of cutters and tie straps. Remedy: See Q. 25 Peening on front corners of cutters and tie straps.
Saw Chain 73 SAW-CHAIN TROUBLESHOOTING (CONTINUED) REMEDIES: (Q-R) Q. Chain with tight joints cannot be repaired. Replace the chain and maintain proper tension. Replace rim sprocket if worn. This remedy applies to pictures 24 and 25 . R. Replace the spur drive sprocket. Replace the chain. Always maintain proper tension and do not run chain on a worn drive sprocket. This remedy applies to picture 26 . PROBLEM Chain cuts crooked Crooked cutting can be caused by your guide bar as well as your chain.
74 Guide Bars HERE’S HOW THE OREGON® SAW BAR * 20 Length in Inches Gauge 12" 14" 18" 20" 36" (Etc.) 8 RN Oregon® Bar Type 0=.050" POWER MATCH SYMMETRICAL SPROCKET-NOSE BAR RN= Symmetrical replaceable sprocket-nose 8=.058" GN=Symmetrical replaceable sprocket-nose with Guard Mate® holes 3=.063" REDUCED WEIGHT POWER MATCH® BAR 4=.
Guide Bars 75 PART-NUMBERING SYSTEM WORKS D D009 Nose Size A B D E = = = = F = G = H = Sprocket-nose Bars Nose-sprocket Tooth Count = 10 = 10, 11, or 12 = 9, 10, or 11 = 7 or 9 (3/8" low profile “90” or “91” chains only) .404" = 10 or 11 .325" = 12 3/8" = 11 Nose Pitch 1/4" .325" 3/8" 3/8" Solid-nose Laser Tip and Laser-Lite™ Bars Nose Radius X = Extra Small (.95") S = Small (1.12") M = Medium (1.33") L = Large (1.65") Bar Mount A218 A318 A041 A061 A064 A074 A095 D009 D176 (Etc.
76 Guide Bars OREGON® GUIDE-BAR TERMS CHAIN LEAD-INS RAILS GROOVE NOSE-ATTACHMENT RIVET HOLES BAR MOUNT BAR-CHAIN OIL HOLE NOSE SPROCKET GREASE HOLE NOSE SPROCKET TAIL BAR BODY REPLACEABLE SPROCKET NOSE NOSE RIVETS SOLID NOSE ARMOR TIP INTENZ® BUILT-IN TENSIONING SYSTEM OREGON® GUIDE-BAR-MAINTENANCE TOOLS SPANNER WRENCH *Asst’d.
Guide Bars 77 IMPORTANT INFORMATION ON OREGON® INTENZ® GUIDE BARS Intenz® bars are those which have our patented Intenz® chain-tensioning mechanism built right into the bar itself. Read and follow the information about Intenz® bars on this page, and provided inside the packaging sleeves of Intenz® bars. Replacing the bar on saws currently equipped with an Intenz® bar Chainsaws originally equipped with an Intenz® bar do not have a "bar-adjustment pin" for tensioning the chain.
78 Guide Bars OREGON® GUIDE-BAR MAINTENANCE ATTENTION: Oregon® urges dealers, chainsaw users, and anyone who services guide bars to become familiar with proper bar-maintenance techniques and the possible dangers which can result if bars are not properly maintained. WARNING Always turn off your saw’s engine before handling the chain, guide bar or sprocket. Failure to do so can result in severe injury. NOTES Never use guide bar as a lever to lift, twist or pry.
Guide Bars 79 BASIC GUIDE-BAR MAINTENANCE (CONTINUED) ■ Turn nose sprocket while pumping grease until whole sprocket has new grease. Do not push dirt into the hole. ● ● 90 ◆ ◆ With chain on ◆ the bar, hold a straightedge against the bar body and against a cutter side plate. A good groove will hold the chain straight, leaving a small gap between the straightedge and bar body. A worn groove will let the chain lean until straightedge is flush with bar body. Replace bar if groove is worn.
80 Guide Bars HOW TO REPLACE OREGON® POWER MATCH BAR NOSES NOTE Select a new Power Match® nose with the correct pitch for your bar and chain. Reduced-kickback Double Guard® replacement noses can be installed on any Power Match® bar and can be used with the same drive-link-count loop of chain. "X" Side Up 1. Each Oregon® Power Match bar nose is marked, on one side only, with an “X.” Always strike on the “X”-stamped side of Power Match® bar noses.
Guide Bars 81 POWER MATCH® BAR NOSES (CONTINUED) 4. With the bar body, nose, and rivet solidly supported on a strong flat metal surface, peen the Power Match® rivet’s head down with the flat end of a hammer. Do not hit the bar body, hit only the rivet head. Strike only on the “X” side. To check installation, grip the bar body in one hand, the nose in the other hand, and twist. Nose and body should feel like a single, solid piece.
82 Guide Bars HOW TO REPLACE NOSE SPROCKETS ON PRO-LITE®, AND MICRO-LITE™ PRO BARS NOTE Select a new nose sprocket with the correct pitch for your bar and chain. 1. Drill or punch out heads from each of the nose-sprocket rivets. Punch out the remainder of the rivets. Use a punch narrow enough to keep from damaging rivet holes in the bar’s nose. 2. Use a small screwdriver to spread the bar-nose rails just enough to remove the old nose sprocket. Clean out debris from the sprocket area. 3.
Guide Bars 83 PRO-LITE®/MICRO-LITE™ PRO NOSE SPROCKETS (CONTINUED) 4. Once fully inside the nose, hold the sprocket in place, then remove the tissue. 5. Align the sprocket’s innerrace holes with the holes in the bar nose. Insert rivets into each hole through the bar. On used bars the nose rails may tend to spread apart. Use a small clamp to hold the nose rails together when inserting and securing the rivets. 6.
84 Guide Bars GUIDE-BAR TROUBLESHOOTING Most guide bar problems occur in the bar rails, and are caused by four things: incorrect chain tension, lack of lubrication, and accidents or irregular operating techniques which pinch the rails or push the drive links sideways against the bar rails. Look closely at your guide bar and compare it to the following illustrations. See the following pages for remedies to these problems.
Guide Bars 85 GUIDE-BAR TROUBLESHOOTING (CONTINUED) 33 34 Rails around the tip of solid-nose bars are split at the bottom of the bar groove. Remedy: See V. Rails along the bar body or around the tip of sprocket-nose bars show blue discoloration. Remedy: See W PROBLEM Bar sprocket-nose failure 35 Chipped rails or excessive rail wear just behind the hard stellite alloy on solid-nose bars, or near the nose connection on replaceable-sprocketnose bars. Remedy: See X.
86 Guide Bars GUIDE-BAR TROUBLESHOOTING (CONTINUED) REMEDIES: (T-Y) T. Shallow grooves and wire edges are the result of inadequate lubrication, improper tension or normal wear over time. Use a flat file to square up the bar’s rails and remove wire edges promptly. Left alone, wire edges can break off, chipping away good rail material. This remedy applies to pictures 29 and 30 . U. A low rail is caused by one of two things: (a) crooked-cutting chain or (b) chain leaning over in a worn groove.
Guide Bars 87 GUIDE-BAR TROUBLESHOOTING (CONTINUED) REMEDIES: (T-Y) (CONTINUED) X. Such wear or chipping near the nose often accompanies heavy limbing, but can also be caused by loose chain tension. Invert the bar on the saw periodically to reduce such wear. On replaceable-nose bars with minor wear, install a new nose and file down the nose’s rails as shown on page 81, instruction number 5, for smooth chain flow. If wear is extensive (on solid-nose or replaceable-nose bars), replace the bar.
88 Drive Sprockets OREGON® SPROCKET TERMS RIM SPROCKET SPUR SPROCKET Clutch Drum Dust Cover Clutch Skirt Bore Spur Teeth OREGON® SPROCKET-MAINTENANCE TOOLS GREASE GUN PART NUMBER, EACH: 40469-A 40-PACK: 31187-A
Drive Sprockets 89 OREGON® RIM SPROCKETS WITH WEAR-DEPTH INDICATORS The free-floating rim is the component of a sprocket system which is replaceable. • Popular Oregon® rims have wear-depth indicators. When sprocket wear reaches the depth of the indicator, it’s easy to see that it’s time to replace the rim. WEAR DEPTH INDICATOR RADIAL PORT WEAR DEPTH INDICATOR • Popular Oregon® rims also have a radially ported design which uses centrifugal force to throw off sawdust and debris.
90 Drive Sprockets OREGON® SPROCKET MAINTENANCE ATTENTION: Oregon® urges dealers, chainsaw users, and anyone who services sprockets to become familiar with proper sprocket-maintenance techniques and the possible dangers which can result if sprockets are not properly maintained. WARNING Always turn off your saw’s engine before handling the chain, guide bar or sprocket. Failure to do so can result in severe injury.
Drive Sprockets 91 BASIC SPROCKET-MAINTENANCE TASKS (CONTINUED) ▲■ ▲ ■ Chain tension is especially important when the saw is tipped on its side during felling cuts. Loose chain (and rim-type sprocket, if used), will slide down and out of alignment with the bar. Loose chain tension is the leading cause of sprocket problems. OK ● Clean any buildup of sap or debris from splined hub so rim sprocket can float freely. ◆ Do not run old chain on a new sprocket, or a new chain on an old sprocket.
92 Drive Sprockets SPROCKET TROUBLESHOOTING Most sprocket problems are caused by loose chain tension and failure to replace the sprocket or clutch drum when necessary. Sprockets are inexpensive. One worn inexpensive sprocket can rapidly damage an expensive chain and bar. Do not try to save money by running new chains on old sprockets. Look for the conditions below and replace sprockets and clutch drums promptly.
Drive Sprockets 93 SPROCKET TROUBLESHOOTING (CONTINUED) 40 41 Cracks or breakage on the clutch drum. Remedy: See BB. Obvious wear or discoloration around the outer circumference of the drum skirt. Remedy: See CC. 42 Excessive wear on the inside surface of the drum skirt. Remedy: See DD. REMEDIES: (Z-DD) Z. Such outer surface wear is normal over time. Replace rim sprockets and spur sprockets when wear is 1/64” deep. Never run chain on severely worn sprockets.
94 Saw Chain HOW A CUTTER WORKS Understanding how cutters work can help you see why proper chain maintenance is so important. 1. The depth gauge rides on the wood and controls the depth at which the cutting corner bites in. 2. The cutting corner and side plate sever the cross grains. This is the hardest part of the work. 3. The top-plate cutting angle chisels out the severed wood fibers, lifting them up and out of the kerf.
Saw Chain 95 HOW TO ORDER REPLACEMENT CHAIN For the best possible service, have the following four items of information ready for your Oregon® dealer. 1. Your saw’s make and model. SAW MAN 1100-A 2. Your guide bar’s cutting length. Cutting length (called length) Overall length NOTE Your bar’s cutting length (or “called length”) is different from its overall length. The cutting length is the distance from the front of the saw to the tip of the farthest cutter. 3.
96 Saw Chain READ THE WARNING ON PAGE 17. Cutting frozen wood will cause rapid wear and possible breakage around the rear rivet hole of cutters. Follow the steps below to keep cold-weather wear to a minimum. OIL – use a lighter weight of bar-chain oil, or dilute barchain oil 25 percent with clean kerosene or diesel oil. Use twice as much of this diluted oil during operation, and be certain your chain is receiving oil from the saw. TENSION – Keep your chain correctly tensioned. Check and adjust often.
97 THE OREGON® CUSTOMER-SATISFACTION POLICY LIMITED WARRANTY Oregon® (Oregon Cutting Systems Division, Blount, Inc.) warrants its products to be free from defects in materials and workmanship for as long as they are owned by the original retail purchaser. If you like our products, please tell your friends. If you are not satisfied with our products, for any reason, please tell us. Oregon® wants to provide you with products that perform to your full satisfaction. We welcome you to contact us as shown below.
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