Maintenance and Safety Manual Saw Chain, Guide Bar and Drive Sprocket
Chain Saw Safety If you do not have experience and specialized training for dealing with chain saw kickback, then OREGON® urges you to use only low-kickback saw chains which have this green* label: ATTENTION: READ THIS The saw chain in this package is low kickback saw chain. It met the reduced kickback requirements of ANSI B175.1 when tested on a representative sample of chain saws. Its safety features significantly reduce the hazard of kickback while maintaining high cutting performance.
Chain Saw Safety Your chain saw is only as good as your cutting system (saw chain, guide bar, and drive sprocket). They function as a team while doing the actual work of cutting wood and therefore must be maintained as a team. A properly maintained saw chain, guide bar, and drive sprocket will provide excellent cutting performance. An improperly maintained saw chain will cause damage to the guide bar and drive sprocket, will cut poorly, and will create potential safety hazards.
Chain Saw Safety Recommended Personal Protective Equipment Wear gloves to prevent slippage and to protect hands. Wear protective pants or chaps to protect legs. Wear chain saw protective boots or safety boots and gaiters to protect feet. Wear hard hat to protect head. Wear ear protection to protect ears. Wear safety goggles, glasses or face shield to protect eyes. NOTE: Dress properly — do not wear clothing that is too tight or too loose.
Contents Saw Chain OREGON® Saw Chain Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 OREGON® Saw Chain Maintenance Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Saw Chain Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 OREGON® End-user Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 OREGON® Round Ground Saw Chain. . . . . . . . . . . . . . . . .
SAW CHAIN OREGON® Saw Chain Terms Saw Chain Pitch Saw chain pitch is the distance between any three consecutive rivets, divided by two. OREGON® saw chain pitches are: ÷2 1/4" .325" 3/8" .404" 3/4" Saw Chain Gauge Saw chain gauge is the drive link’s thickness where it fits into the guide bar groove. The industry standard for saw chain gauges are: .043" (1.1 mm) .050" (1.3 mm) .058" (1.5 mm) .063" (1.6 mm) Harvester applications: .063" (1.6 mm) .080" (2 mm) .122" (3.
NOTE: Highlighted parts below indicate kickback-reducing “bumper link” features: bumper tie strap, bumper drive link, and ramped depth gauge.
SAW CHAIN OREGON® Saw Chain Maintenance Tools Filing Tools Assembled Filing Guide Round File Guide Bar-mounted Filing Guide Sharpening Kit Flat File File Handle Depth Gauge Tool Filing Vise Grinders Sure Sharp® 12-volt Grinder Bench-model Chain Grinder Mini Grinder Grinding Wheels Saw Chain Repair Tools Saw Chain Breaker 4 Rivet Spinner Pocket Saw Chain Breaker
Saw Chain Identification OREGON® Saw Chain Type Saw Chain Gauge in. mm Cutter Type End View Side View KickbackCutter Reducing Sequence Features (if any)* Round Ground – 1/4" 25AP Micro Chisel® SAW CHAIN OREGON® Saw Chain Part Micro Chisel® .050" 1.3 Standard Round Ground – 3/8" Low Profile™ Chamfer Chisel™ 90PX Micro-Lite® .043" Low Vibration 1.1 90SG Micro-Lite® .043" Low Vibration LowKickback 1.1 91PX Low Vibration XtraGuard® .050" LowKickback 1.
SAW CHAIN Saw Chain Identification OREGON® Saw Chain Part OREGON® Saw Chain Type Saw Chain Gauge in. mm Cutter Type End View Side View KickbackCutter Reducing Sequence Features (if any)* Round Ground – .325" 20BPX 21BPX 22BPX Micro Chisel® .050" .058" .063" 1.3 1.5 1.6 Micro Chisel® Standard Micro Chisel® 95VPX 20LPX 21LPX 22LPX Micro Lite™ .050" LowKickback 1.3 .050" .058" .063" 1.3 1.5 1.6 Super 20 Standard Chisel Standard Round Ground – 3/8" 72V 73V 75V Vanguard® .050" Low.
OREGON® Saw Chain Type Saw Chain Gauge in. mm Cutter Type End View Side View KickbackCutter Reducing Sequence Features (if any)* Round Ground – 3/8" (cont.) 72LPX 73LPX 75LPX Super 70 .050" .058" .063" 1.3 1.5 1.6 72JPX 73JPX 75JPX Super 70 .050" .058" .063" 1.3 1.5 1.6 SAW CHAIN OREGON® Saw Chain Part Chisel Standard Chisel Skip Round Ground – .404" Micro Chisel® 27X Micro Chisel® .063" 1.6 27AX Micro Chisel® .063" 1.6 58L 59L Super Guard® .058" .063" 1.5 1.
SAW CHAIN Saw Chain Identification OREGON® Saw Chain Part OREGON® Saw Chain Type Saw Chain Gauge in. mm Cutter Type End View Side View KickbackCutter Reducing Sequence Features (if any)* Square Ground – 3/8" 72CL 72CLX 75CL 75CLX Super Guard® .050" .050" .063" .063" 1.3 1.3 1.6 1.6 Chisel 72CK 72CKX 75CK 75CKX Super Guard® .050" .050" .063" .063" 1.3 1.3 1.6 1.6 Chisel 72CJ 72CJX 75CJ 75CJX Super Guard® .050" .050" .063" .063" 1.3 1.3 1.6 1.
Saw Chain Gauge OREGON® Saw Chain Type in. mm Cutter Type End View Side View KickbackCutter Reducing Sequence Features (if any)* Specialty – .325" M20LPX M21LPX M22LPX .050" Multicut™ .058" .063" 1.3 1.5 1.6 SAW CHAIN OREGON® Saw Chain Part Chisel Standard Specialty – 3/8" 72RD 73RD 75RD M72LPX M73LPX M75LPX 3/8" Ripping Chain .050" .058" .063" 1.3 1.5 1.6 .050" Multicut™ .058" .063" 1.3 1.5 1.6 Semi-Chisel Standard Chisel Standard Specialty – .404" 27R 27RA .
SAW CHAIN Saw Chain Drive Link Number Identification 72 Nearly all OREGON® saw chains are named by a part number made up of a number (see below), followed by one, two or three letters (see facing page). OREGON® Part number Examples: 18HX, 72LPX, 91VG The Numbers: 18 HX, 72 LPX, 91 VG The numbers are stamped on the saw chain’s drive links and indicate the physical size of the saw chain (pitch and gauge). 72 72 Chain Number Pitch Gauge in. mm 11 3/4" .122" 3.1 16 .404" .063" 1.6 18 .404" .
A LPX LX M P PS PX PXL R RA RD S SG VG VPX VXL Low vibration round-ground chisel cutter, bumper drive link, standard sequence Round-ground chisel cutters, ramped depth gauges, equal pitch, standard sequence Specially-built chain designed for cutting in extremely dirty or abrasive conditions Chamfer Chisel™ cutter, bumper drive link, standard sequence PowerSharp® chain, ramped depth gauges, guidance drive links, standard sequence (no hand maintenance required) Low-vibration Chamfer Chisel™ cutter
SAW CHAIN OREGON® End-user Symbols Each of these four symbols represents a large category of saw chain users. OREGON® saw chains are listed under one or more of these symbols, generally indicating the type of user for whom the saw chain is intended.
P/N Gauge 25AP* .050" 1.3 mm Use Kickback-Reducing Features ROUND GROUND SAW CHAIN 25AP – 1/4" Micro Chisel® End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
ROUND GROUND SAW CHAIN 90PX – Micro-Lite™ – 3/8" Low Profile™ Micro-Lite® Chamfer Chisel™ P/N Gauge 90PX .043" 1.1 mm Use Kickback-Reducing Features End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
P/N Gauge 91PXL .050" 1.3 mm Use Kickback-Reducing Features Low-Kickback ROUND GROUND SAW CHAIN 91PXL – 3/8" Long Top Plate – Low-Profile™ Semi-Chisel End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
ROUND GROUND SAW CHAIN 91VXL – 3/8" Long Top Plate – Low-Profile™ Semi-Chisel P/N Gauge 91VXL .050" 1.3 mm Use Kickback-Reducing Features End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
P/N Gauge 95VPX .050" 1.3 mm Use Kickback-Reducing Features Low-Kickback ROUND GROUND SAW CHAIN 95VPX – Micro-Lite™ – .325" Micro Chisel® End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
ROUND GROUND SAW CHAIN 72V, 73V, 75V – Vanguard® – 3/8" Vanguard® Chisel P/N Gauge 72V .050" 1.3 mm 73V .058" 1.5 mm 75V .063" 1.6 mm Use Kickback-Reducing Features Low-Kickback End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
P/N Gauge 72LGX, JGX .050" 1.3 mm 73LGX, JGX .058" 1.5 mm 75LGX, JGX .063" 1.6 mm Use ROUND GROUND SAW CHAIN 72LGX/JGX, 73LGX/JGX, 75LGX/JGX – Super Guard® – 3/8" Chisel Kickback-Reducing Features End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
ROUND GROUND SAW CHAIN 27X, 27AX – Micro-Chisel® – .404" Micro-Chisel® P/N Gauge 27X, 27AX .063" 1.6 mm Use Kickback-Reducing Features End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
P/N Gauge 68LX, 68JX .063" 1.6 mm Use ROUND GROUND SAW CHAIN 68LX, 68JX – Super Chisel® – .404" Chisel End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
SQUARE GROUND SAW CHAIN 72CL/CLX, 75CL/CLX – Super Guard® – 3/8" Chisel P/N Gauge 72CL, CLX .050" 1.3 mm 75CL, CLX .063" 1.6 mm Use Kickback-Reducing Features End View Square Ground Saw Chain < 6.0 cu in. / 100 cc < 36" 90 cm 72CK/CKX, 75CK/CKX – Super Guard® – 3/8" Chisel P/N Gauge 72CK, CKX .050" 1.3 mm 75CK, CKX .063" 1.6 mm Use Kickback-Reducing Features End View Square Ground Saw Chain < 6.0 cu in. / 100 cc 22 < 36" 90 cm See page 11 for saw chain descriptions.
P/N Gauge 72CJ, CJX .050" 1.3 mm 75CJ, CJX .063" 1.6 mm Use SQUARE GROUND SAW CHAIN 72CJ/CJX, 75CJ/CJX – Super Guard® – 3/8" Chisel Kickback-Reducing Features End View Square Ground Saw Chain < 6.0 cu in. / 100 cc < 36" 90 cm 68CL, 68CJ – Super Chisel® – .404" Chisel P/N Gauge 68CL, 68CJ .063" 1.6 mm Use End View Square Ground Saw Chain > 4.0 cu in.
SPECIALTY SAW CHAIN 25A Carving Saw Chain – OREGON Sculptor® – 1/4" Micro Chisel® P/N Gauge 25A .050" 1.3 mm End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
Micro Chisel® P/N Gauge 25F .050" 1.3 mm End View SPECIALTY SAW CHAIN 25F Carving Saw Chain – OREGON Sculptor® – 1/4" (Full-House) 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
SPECIALTY SAW CHAIN M91VXL – Multicut™ – 3/8" Low Profile™ Semi-Chisel P/N Gauge M91VXL .050" 1.3 mm Use Kickback-Reducing Features End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
P/N Gauge M72LPX .050" 1.3 mm M73LPX .058" 1.5 mm M75LPX .063" 1.6 mm SPECIALTY SAW CHAIN M72LPX, M73LPX, 75LPX – Super 70, Multicut™ – 3/8" Chisel Use Kickback-Reducing Features End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
SPECIALTY SAW CHAIN 72RD, 73RD, 75RD – Ripping Saw Chain – 3/8" Semi-Chisel P/N Gauge 72RD .050" 1.3 mm 73RD .058" 1.5 mm 75RD .063" 1.6 mm Use End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
P/N Gauge 27R .063" 1.6 mm Use SPECIALTY SAW CHAIN 27R, 27RA – Ripping Saw Chain – .404" Micro Chisel® End View 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
HARVESTER SAW CHAIN 16H, 18HX – Harvester Saw Chain, Micro Chisel® – .404" Micro Chisel® P/N Gauge 16H .063" 1.6 mm 18HX .080" 2.0 mm Use End View * 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
P/N Gauge 11BC .122" 3.1 mm Use HARVESTER SAW CHAIN 11BC – Chipper, Harvester Saw Chain – 3/4" Chipper End View * 5-3/4" x 3/16" x 7/8" 146 mm x 4.8 mm x 22.
SAW CHAIN The Four Basic Saw Chain Rules Attention Chain Saw 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 saw chain, guide bar, and drive sprocket — and reduce safety hazards at the same time. Rule Number 1 Your saw chain must be correctly tensioned More saw chain and guide bar problems are caused by incorrect saw chain tension than by any other single factor.
SAW CHAIN Rule Number 3 Your saw chain’s depth gauges must be set correctly Depth gauge setting and depth gauge shape are critical to performance and safety. See pages 38 – 39 for instructions on how to set depth gauges. Rule Number 4 Your saw chain must be sharp When your saw chain is sharp, it does the work. When it’s not, you do the work — and your guide bar and drive sprocket will wear more rapidly. See pages 40 – 41 for instructions on how to sharpen your saw chain.
SAW CHAIN Saw Chain Maintenance ATTENTION: DEALERS, CHAIN SAW USERS, AND ANYONE WHO SERVICES SAW CHAIN. IMPORTANT SAFETY INFORMATION. OREGON® urges you to become familiar with proper saw chain maintenance techniques, and the possible dangers which can result if saw chain is not properly maintained. Warning Failure to follow the instructions below can result in severe injury to the chain saw operator, bystanders, or the person performing maintenance.
Read operation and handling warnings on previous page. SAW CHAIN How to Tension your Saw Chain without Intenz® Note: Always wear protective gloves. 1. Turn the engine off. Note: Never tension your saw chain right after cutting when the saw chain has expanded in length from the heat. Saw chain tensioned while hot will contract when it cools, and can damage your guide bar and saw chain. ONLY TENSION SAW CHAIN WHEN THE SAW CHAIN HAS COOLED. 2. Loosen guide bar mounting nuts on the side of your chain saw. 3.
SAW CHAIN Saw Chain Maintenance How to Tension your Saw Chain without Intenz® (cont.) 5. With either type of guide bar, hold the nose up and tighten your chain saw’s rear guide bar mounting nut first, then tighten the front nut. 6. Pull the saw chain by hand along the top of the guide bar several times, from the engine to the guide bar’s tip. Saw chain should feel snug but still pull freely. Note: If you have a sprocket-nose guide bar you should now perform the snap test.
SAW CHAIN How to Tension your Saw Chain with Intenz® 1. Turn the engine off. 2. Loosen the guide bar mounting nuts on the side of the chain saw. 3. Insert a screwdriver or Scrench in the Intenz™ slot of the guide bar. I ® ENZ NT PATENT (BREVET) #6,061,915 4. Turn the screwdriver or Scrench to move the guide bar forward, away from the chain saw as far as possible. I ENZ NT ® 5. Tighten the back guide bar mounting nut, then tighten the front nut.
SAW CHAIN Saw Chain Maintenance How to Set Depth Gauges Read operation and handling warnings on page 34. Note: • On-chain saw depth gauge setting requires proper saw chain tension, as shown on pages 35 – 37, prior to filing. • Pages 13 – 31 show the correct depth gauge setting and the part number of the correct depth gauge tool for each of the different OREGON® saw chain types. • Find the page (13 – 31), which gives the correct filing specifications for your OREGON® saw chain type.
SAW CHAIN Note: Do not file or alter the tops of kickback-reducing bumper tie straps or bumper drive links. 4. File from the inside of the round ground saw chain cutters to the outside. (For square ground saw chain, file from the outside of the cutter to the inside.) outside inside 5. After lowering, always file off the front corner of each depth gauge parallel to its original rounded or ramped shape.
SAW CHAIN Saw Chain Maintenance How to Sharpen Cutters Read operation and handling warnings on page 34. Note: • On-chain saw sharpening requires proper saw chain tension. • Pages 13 – 31 show the correct maintenance specifications and the correct maintenance tool part numbers for each of the OREGON® saw chain types. • Find the correct filing specifications for your OREGON® saw chain type. • If unsure of your OREGON® saw chain’s type, part number or filing specification, ask your OREGON® saw chain dealer.
SAW CHAIN 4. If damage is present on the chrome surface of top plates or side plates, file back until such damage is removed. 5. Keep all cutter lengths equal. A A=B B 6. Recheck depth gauges. If resetting of the depth gauges is necessary, follow instructions on pages 38 – 39. Note: Do not file or alter the tops of kickback-reducing bumper tie straps or bumper drive links.
SAW CHAIN Saw Chain Maintenance – Square Filing Who should perform square filing? Most chain saw users will probably never need to use square saw chain, nor learn to perform square filing. But in areas where the timber is larger and the guide bars used are longer, the performance advantages of square saw chain can outweigh the fact that square 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.
SAW CHAIN But whichever direction you choose, be sure your file and your cutting edges stay positioned as shown in the preceding File Positioning section. File all cutters on one side of the saw chain, then reverse the saw chain and repeat the process. Use the same file positions for cutters on the opposite side of the saw chain. Tools Only use files specially designed for square chisel cutters, available from your chain saw dealer.
SAW CHAIN Saw Chain Maintenance How to Install New Saw Chain Parts Read operation and handling warnings on page 34. Note: Use only OREGON® parts to repair OREGON® saw chain, and only use parts which are the correct size and type for your saw chain. 1. Remove rivets, and parts to be replaced, as shown under “How to Break Out Rivets,” pages 46 – 47. Never reassemble a saw chain with old preset tie straps — always use new preset tie straps. 2.
SAW CHAIN 4. Assemble saw chain to the preset tie strap. 5. Assemble tie strap with brandmark, Lubrilink™ contour or dot 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 2 – 3. If unsure, ask your OREGON® dealer. 7. To form rivet heads, use an OREGON® rivet spinner.
SAW CHAIN Saw Chain Maintenance How to Break Out Rivets Note: Always wear approved safety accessories for hands and face when breaking out rivets. 1. Select proper anvil slot number on saw chain breaker anvil which matches the drive link number on the saw chain to be broken (see Saw Chain Drive Link Number Chart on the next page). 25 3/8 72 3/8 2.
1. When removing rivets from broken drive links, hold the two broken segments together in their original (unbroken) positions as you tighten the saw chain link in the adjustable anvil. SAW CHAIN Removing Rivets from Broken Drive Links 2. See steps 1 – 3 from “How to Break Out Rivets” on the previous page. Saw Chain Drive Link Number Chart Anvil Slot Number Drive Link Number 1/4 .325 90/ 91 3/8 .
SAW CHAIN Saw Chain Maintenance 48 How to Break in a New Saw Chain The life of your new saw chain can be extended by taking these few simple steps before using it. 1. Oil your saw chain prior to use.
SAW CHAIN 2. Never run any saw chain on a worn drive sprocket rim or spur system*, especially a new saw chain. Replace your rim or spur system after every two saw chains, or sooner. or 3. Run new saw chain at half throttle for several minutes before doing any cutting in order to allow oil to reach all parts of the guide bar and saw chain. Allow the chain saw and the cutting system to warm up fully.
SAW CHAIN Saw Chain Troubleshooting Most saw chain problems are caused by four things: incorrect saw chain tension, incorrect filing, lack of lubrication and cutting any material other than wood. Here are the things you should look for, and the corrective actions you should take: Problem Cuts slow, cuts rough, or won’t hold an edge Look closely at your saw chain’s cutters, and compare them to the 12 illustrations below. 1 2 Light abrasive damage on side plates. Remedy: See A.
SAW CHAIN Remedies: A. File cutters back until all damage is removed. (pictures 1, 2, and 3) B. Resharpen cutters while holding your file at the correct top plate filing angle for your saw chain. Be sure your file guide is stamped with your saw chain’s correct top plate angle. (pictures 4 and 5) C. Either your file was too small or it was held too low. Resharpen cutters with a file of the correct size, held in the correct position. Use the correct file guide. (pictures 6 and 8) D.
SAW CHAIN Saw Chain Troubleshooting Problem Cutters and tie straps wear heavily or break 13 Excessive heel wear on cutters and opposite tie straps. Remedy: See H. 14 Cracks under rear rivet holes on cutters and opposite tie straps. Remedy: See H. 15 Tie straps between cutters, broken in the center. Remedy: See I. 16 Bottoms of tie straps and cutters worn out of square. Remedy: See J. Remedies: H. Replace worn or cracked cutters and/or tie straps.
Drive links wear heavily or break 17 Straight bottoms. Remedy: See K. 20 Peening in front or back. Remedy: See M. 18 Concave bottoms. Remedy: See K. 21 Drive link tang is turned up. Remedy: See N. 19 SAW CHAIN Problem Battered and broken bottoms. Remedy: See L. 22 Worn fronts. Remedy: See O. 23 Sides worn round or thin at bottoms. Remedy: See P. Remedies: K.
SAW CHAIN Saw Chain Troubleshooting N. Drive sprocket has worn down until drive link tangs hit bottom. Replace drive sprocket. Sharpen drive link tangs as shown in the illustration below, if possible. If not, replace the saw chain. (picture 21, previous page ) O. Remove damage from sides of drive links with a flat file. Sharpen drive link tangs as shown in the illustration below. Use a thin file to open the groove lead-in at the guide bar’s tail. (picture 22, previous page) P.
Saw chain cuts crookedly, leads to one side or cuts unevenly 27 SAW CHAIN Problem Damage to cutters on one side of the saw chain. Remedy: See S. 28 Inconsistent sharpening. Remedy: See S. Remedy: S. File cutters back enough to remove all damage and incorrect angles. Keep cutter lengths and depth gauge settings equal (pictures 27 and 28).
Guide Bar Terms Saw chain lead-ins Rails Groove Guide bar saw chain oil hole or Lubri-Jet® hole Adjustment hole GUIDE BAR Nose attachment rivet holes Nose sprocket grease hole Nose rivets Tail Nose sprocket Guide bar body Solid nose armor tip Tail Intenz® saw chain-tensioning mechanism Guide bar body Laminated guide bar Tip guard Tail Guide bar body POWER MATCH 56 Reduced-weight guide bar with aluminum insert ® REDUCED WEIGHT
Guide Bar Maintenance Tools Spanner wrench “Scrench” Flat file with handle Grease gun Guide bar groove cleaner GUIDE BAR 57
How the OREGON® Guide Bar Part Numbering System Works OREGON® 10-digit guide bar part numbers are printed on the guide bar package and etched on the guide bar body. Here’s what each digit means: GUIDE BAR 24 0 RN D D025 LENGTH 8" 10" 11" 12" 13" 14" 15" 16" 18" 20" 21" 22" 24" 26" 25" 27" 28" 30" 32" 33" 34" 36" 37" 42" GAUGE 4 = .043" 0 = .050" 8 = .058" 3 = .
PITCH A B D E F G H BAR MOUNT TOOTH COUNT 1/4" .325" 3/8" 3/8" .404" .325" 3/8" 10 10 or 12 9 or 11 7 or 9 10 12 11 SOLID NOSE M Medium (1.33") A041 A061 A064 A074 A089 A095 A218 A318 D007 D009 D024 D025 D033 D096 D176 D196 E031 K041 K095 K216 Z095 GUIDE BAR SPROCKET NOSE INTENZ® T041 T074 T095 T218 T318 Power Match® solid body guide bars may be stamped with XXX, ZZZ or other letters as they can have different noses installed on the body, thereby changing the part number.
Guide Bar Maintenance ATTENTION: DEALERS, CHAIN SAW USERS, AND ANYONE WHO SERVICES SAW CHAIN. IMPORTANT SAFETY INFORMATION. Warning Always turn off your chain saw’s engine before handling the guide bar. Failure to do so can result in severe injury. GUIDE BAR For proper mounting of your guide bar, refer to the operator’s manual for your chain saw. Note: • Never use guide bar as a lever to lift, twist, or pry. • A guide bar requires constant supply of oil during operation.
8. u 9. u 10. u With saw chain on the guide bar, hold a straightedge against the guide bar body and against a cutter side plate. A good groove will hold the saw chain straight, leaving a small gap between the straightedge and guide bar body. A worn grove will let the saw chain lean until straightedge is flush with guide bar body. Replace guide bar if groove is worn.
Replacing OREGON® Power Match® Guide Bar Noses GUIDE BAR NOTE: Select a new Power Match® nose with the correct pitch for your guide bar and saw chain. Reduced-kickback Double Guard® replacement noses can be installed on any Power Match® guide bar and can be used with the same drive link count loop of saw chain. 1. Note that your OREGON® Power Match® guide bar nose is marked, on one side only, with dimple or “X”. Always strike on this side of Power Match® guide bar noses.
es 4. With the guide 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 guide bar body, hit only the rivet head. Strike only on the “X” side; To check installation, grip the guide bar body in one hand, and twist. Nose and body should feel like a single, solid piece.
Replacing OREGON® Pro-Lite® Nose Sprockets GUIDE BAR 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 guide bar’s nose. 2. Use a small screwdriver to spread the guide bar nose rails just enough to remove the old nose sprocket. Clean out debris from the sprocket area. 3. Inside the nose sprocket package you’ll find the new sprocket wrapped in a tissue.
5. Align the drive sprocket’s inner race holes with the holes in the guide bar nose. Insert rivets into each hole through the guide bar. On used guide 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. 7. Grease the new nose sprocket. Clean out guide bar grease hole before using lubricant. Pump grease into hole until excess grease appears around the nose sprocket teeth of the guide bar. GUIDE BAR 6.
Guide Bar Troubleshooting Most guide bar problems occur in the guide bar rails, and are caused by four things: lack of lubrication, incorrect saw chain tension, and accidents or irregular operating techniques which pinch the rails or push the drive links sideways against the guide bar rails. Problem Worn Rail Conditions GUIDE BAR 31 32 Rails are worn down, groove becomes shallow. Remedy: See T. 34 Outsides of rails develop wire edges. Remedy: See T.
38 Rails in the tip of a sprocketnose guide bar have spread, allowing loss of bearings. Remedy: See Y. 39 The sprocket in a sprocket-nose guide bar breaks. Remedy: See Y. Remedies: U. A thin or low rail is caused by one of two things: (1) crookedcutting saw chain, see pages 55, or (2) saw chain leaning over in a worn groove, see picture 23, page 53. Replace the guide bar. Replace the saw chain as well if saw chain continues to lean in the new guide bar. (picture 33) GUIDE BAR T.
OREGON® Drive Sprocket Terms Rim Drive Sprocket Clutch Drum Wear-depth Indicators Splined Hub/Adaptor Rim Drive Sprocket Bore Clutch Skirt Spur Drive Sprocket DRIVE SPROCKET Clutch Drum Bore Clutch Skirt Drive Sprocket Maintenance Tools Grease Gun Installing Drive Sprockets OREGON® drive sprockets can be installed on chain saws having either inboard-clutch or outboard-clutch assemblies.
Drive Sprocket Maintenance ATTENTION: DEALERS, CHAIN SAW USERS, AND ANYONE WHO SERVICES SAW CHAIN. IMPORTANT SAFETY INFORMATION. Warning Always turn off your chain saw’s engine before handling the drive sprocket. Failure to do so can result in severe injury. Your drive sprocket, the third member of the cutting team, deserves regular attention and maintenance just like your guide bar and saw chain.
Drive Sprocket Maintenance 6. l Clean any build-up of sap or debris from splined hub so rim drive sprocket can float freely. 7. u Do not run old saw chain on a new drive sprocket, or a new saw chain on an old drive sprocket*. Use two new saw chains in rotation with each new drive sprocket so all can wear together. Replace drive sprocket every two saw chains, or sooner. or DRIVE SPROCKET 8. u Apply clean lithium-based grease to the clutch drum’s bearings each time the drive sprocket is removed.
Drive Sprocket Troubleshooting Problem Drive Sprocket Wear 40 Worn outer surfaces on rim drive sprockets or spur drive sprockets. Remedy: See Z. 41 42 Worn inner surface on rim drive sprockets or wear on the adaptor’s splines. Remedy: See AA. 43 44 Excessive wear on the inside surface of the drum skirt. Remedy: See DD. Remedies: Z. Such outer surface wear is normal over time. Replace rim drive sprockets and spur drive sprockets when wear is 1/64" (0.4 mm) deep.
Useful Information How a Cutter Works Understanding how cutters work can help you see why proper saw chain maintenance is so important. 1. The depth gauge rides on the wood and controls the depth at which the working corner bites in. 2. The working corner and side plate sever the wood fibers across the grain. 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.
Cutting in Cold Weather 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. 0˚ C 32˚ F Oil Dilute guide bar chain oil 25 percent with clean kerosene or diesel oil. Use twice as much of this diluted oil during operation, and be certain your saw chain is receiving oil from the chain saw. Tension Keep your saw chain correctly tensioned. Check and adjust often. Cutters Keep cutters sharp.
74 |X| Grinding Angles |X| Filing Angles FILING CHART A A B B C C D D
CHAMFER CHISEL™ RIPPING CHAIN SEMICHISEL ROUND GROUND CHISEL MICRO CHISEL® A 30° 30° 30° 30° 25° 25° 25° 45° 25° 25° 35° 30° 10° 10° 30° 30° X Filing | X Grinding 3/16" 4.8 mm | 3/16" 5/32" 4.0 mm | 1/8" 7/32" 5.5 mm | 3/16" 3/16" 4.8 mm | 3/16" 3/16" 4.8 mm | 3/16" 7/32" 5.5 mm | 3/16" 7/32" 5.5 mm | 3/16" - 7/32" 5.5 mm | 3/16" 7/32" 5.5 mm | 3/16" 7/32" 5.5 mm | 3/16" 5/32" 4.0 | 1/8" 7/32" 5.5 mm | 3/16" 7/32" 5.5 mm | 3/16" 4.5 mm | 1/8" 5/32" 4.
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