OPERATOR’S MANUAL AutoDrive Lawn Tractor Model 604 ™ Model U604H Shown IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forestcovered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.
SECTION 1: TABLE OF CONTENTS PAGE FINDING YOUR MODEL NUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 CALLING CUSTOMER SUPPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 IMPORTANT SAFE OPERATION PRACTICES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 SAFETY LABLES FOUND ON YOUR UNIT. . . . . . . . . . . . . . . . . . . . .
SECTION 4: IMPORTANT SAFE OPERATION PRACTICES WARNING: THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS WHICH, IF NOT FOLLOWED, COULD ENDANGER THE PERSONAL SAFETY AND/OR PROPERTY OF YOURSELF AND OTHERS. READ AND FOLLOW ALL INSTRUCTIONS IN THIS MANUAL BEFORE ATTEMPTING TO OPERATE YOUR LAWN MOWER. FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY. WHEN YOU SEE THIS SYMBOL, HEED ITS WARNING.
3. CHILDREN • Disengage all attachment clutches, thoroughly depress the brake pedal, and shift into neutral before attempting to start engine. Tragic accidents can occur if the operator is not alert to the presence of children. Children are often attracted to the machine and the mowing activity. Never assume that children will remain where you last saw them. • Your mower is designed to cut normal residential grass of a height no more than 10". Do not attempt to mow through unusually tall, dry grass (e.g.
• Keep all nuts, bolts and screws tight to be sure the equipment is in safe working condition. • Do not change the engine governor settings or overspeed the engine. Excessive engine speeds are dangerous. • Never tamper with safety devices. Check their proper operation regularly. Use all guards as instructed in this manual. • Observe proper disposal laws and regulations. Improper disposal of fluids and materials can harm the environment and the ecology.
Slope Gauge LINE , RE P R E SEN TIN G A 1 5 ° SL OPE OR A FENCE POST A CORNER OF A BUILDING A POWER POLE SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE USE THIS PAGE AS A GUIDE TO DETERMINE SLOPES WHERE YOU MAY NOT OPERATE SAFELY. FOL DO N D OTT ED 15° WARNING Do not mow on inclines with a slope in excess of 15 degrees (a rise of approximately 2-1/2 feet every 10 feet). A riding mower could overturn and cause serious injury.
SECTION 5: ATTACHMENTS & ACCESSORIES MODEL NUMBER OEM-190-601 OEM-190-602 OEM-190-112 OEM-190-118 OEM-190-603 OEM-190-604 OEM-190-822 OEM-190-823 DESCRIPTION FastAttach Twin Bagger Grass Collector (For 42-inch Decks Only) FastAttach Twin Bagger Grass Collector (For 46-inch Decks Only) Mulch Kit (For 42-inch Decks Only) Mulch Kit (For 46-inch Decks Only) FastAttach Grille Guard (mounts on front of tractor) TracPac Storage Container (mounts on rear of tractor) FastAttach 46-inch Front Dozer Blade 42-inch Two
SECTION 7: CONTROLS B D I N* M F* A + 1/10 P P H G C J E K L NOTE: Steering Wheel not shown for clarity.
IGNITION SWITCH IMPORTANT: When To start the engine, insert key into the ignition switch and turn clockwise to the START position. Release key to the ON position once engine has fired. See Figure 4. Refer to STARTING THE ENGINE in the OPERATION section of this manual for detailed starting instructions. The ignition switch is also used to operate the headlights.
ELECTRIC PTO (POWER TAKE-OFF) KNOB BRAKE PEDAL To engage the power to the cutting deck or other attachments, pull outward on the PTO knob. Push the PTO knob inward to disengage the power to the attachments. BRAKE The brake pedal is located on the right front side of the tractor above the AutoDrive pedal along the running board. The brake pedal can be used for sudden stops or setting the parking brake.
SHIFT LEVER F The shift lever is located on the left side of the fender and has three positions, FORWARD, NEUTRAL and REVERSE. The brake pedal must be depressed and the tractor must not be in motion when the moving shift lever. The cruise control button is located on the tractor dash panel to the left of the ignition switch. Push the cruise control button while traveling forward at a desired speed. While holding the button in, release pressure from the AutoDrive pedal.
SETTING THE CUTTING HEIGHT STOPPING THE ENGINE Select the height position of the cutting deck by placing the deck lift lever in any of the six different cutting height notches on the right side of the fender. Then adjust the deck wheels so that they are at least 1/4 inch to 1/2 inch above the ground when the tractor is on a smooth, flat surface such as a driveway.
• While continuing to hold the cruise button in, lift your foot from the AutoDrive pedal (you should feel the cruise latch engage). To turn the tractor’s headlights off: ™ • Turn the key either into the On position (to leave the engine running) or the Off position (to shut the engine off). Refer to Figure 4. • If properly engaged, the cruise control button and the AutoDrive pedal should lock in the down position, and the tractor will maintain the same forward speed.
MOWING • The operator must remain in the tractor seat at all times. If the operator should leave the seat without pushing the PTO knob inward into the disengaged (OFF) position, the tractor’s engine will shut off. This tractor is equipped with one of MTD’s high quality cutting decks. The following information will be helpful when using the cutting deck with your tractor.
• With the tractor parked on a firm, level surface, place the lift lever in the top notch (highest position) and rotate the blade nearest the discharge chute so that it is parallel with the tractor. adjustment and proceed, if necessary, to the next step. • Loosen the two jam nuts on the rear side of the deck stabilizer bracket. See Figure 8A. • Locate the two lock nuts on the opposite side of the stabilizer bracket. See Figure 8A.
SEAT ADJUSTMENT • Replace hex nut and lock washer and retighten the jam nut after proper adjustment is achieved. To adjust the position of the seat, move the seat adjustment lever (located under the seat) to the left and slide the seat forward or backwards. See Figure 9. Make sure seat is locked into one of the six adjustment positions before operating the tractor. NOTE: Threading the ball joints too far onto the drag links will cause the front tires to "toe-in" too far.
• Loosen, but do NOT remove, the hex nut found on the right side of the brake assembly. See Figure 12. Hex Nut • Using a feeler gauge, set the gap between the brake disc and the brake puck at .011". • Re-tighten the hex nut loosened earlier. Set Gap at .011" Brake Disc NOTE: Compression Spring View shown from beneath tractor.
CLEANING THE ENGINE AND DECK • Lower the deck by moving the lift lever into the bottom notch on the right fender. Any fuel or oil spilled on the machine should be wiped off promptly. Do NOT allow grass, leaves, and dirt to accumulate around the cooling fins of the engine or on any other part of the machine, especially the pulleys and other moving parts. Clean the underside of the deck with a wisk broom, putty knife or forced air after each mowing.
CHANGING THE DECK BELT(S) All belts on your tractor are subject to wear and should be replaced if any signs of cracking, shredding or rotting are present. IMPORTANT: The V-belts found on your tractor are specially designed to engage and disengage safely. A substitute (non-OEM) V-belt can be dangerous by not disengaging completely. For a proper working machine, use factory approved belts.
Engine Pulley Deck Stop (mounted on tractor) Belt Guard PTO belt PTO Engagement Plate (mounted on tractor) Idler Pulleys Right Hand Pulley Left Hand Pulley NOTE: Belt covers not shown for clarity.
Variable-speed Pulley Battery Tray Opening Drive belt (Lower) Shift Lever Rear Idler Pulley Belt Keeper Drive belt (Upper) Electric PTO Clutch (if so equipped) Front Idler Pulley Idler Bracket Belt Keeper to AutoDrive pedal ™ Double-Idler Bracket Engine Pulley (Upper Portion) Transmission Idler Pulley Single-speed Transmission NOTE: Transmission Pulley Front of Tractor View shown from above tractor.
• Remove the hex bolt from the center of the engine pulley (or the electric PTO clutch on units so equipped) and gently lower it off of the engine crankshaft. Be careful not to lose any washers or spacers which may be found on top of the engine pulley or the electric PTO clutch. See Figure 18. Using two 9/16" wrenches, remove the pin from the speed control assembly. See Figure 20. Idler Adj.
NOTE: The hex flange nut has a right-handed • After cleaning the battery and terminals, apply a light coat of petroleum jelly or grease to the terminals and over the positive terminal boot. (normal) thread pattern. Do NOT attempt to force the nut in the incorrect direction. Doing so may damage the nut and create a safety hazard. • Always keep the boot positioned over the positive terminal to prevent shorting.
SECTION 11: LUBRICATION WARNING: Always stop the engine and disconnect the spark plug wire(s) and ground against the engine before performing any maintenance. ENGINE Lubricate the engine with motor oil as instructed in the separate engine manual packed with your unit. PIVOT POINTS Lubricate all pivot points (AutoDrive pedal, brake pedal, etc.) at least once a season with light oil. ™ LINKAGE Lubricate all the pivot points on the drive, brake and lift linkage at least once a season with SAE 30 engine oil.
SECTION 12: TROUBLESHOOTING GUIDE Trouble Possible Cause(s) Corrective Action Engine will Safety switch not crank button not depressed. Battery installed incorrectly. There is one safety switch in the starting circuit of your unit: the brake pedal switch. Make certain the actuator is fully depressing the button on this switch. The Operator must be seated on the tractor in order to start the engine, also. The battery must be installed with negative terminal attached to black ground wire.
Model 604 13 28 24 25 37 23 12 21 30 27 2 4 36 29 35 16 40 41 4 10 19 4 22 19 22 41 33 2 32 22 26 40 14 8 20 4 15 31 1 34 39 42 7 19 1 19 22 3 8 38 42 9 9 18 1 6 22 26
Tractor Body REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 PART NO.
Model 604 49 43 42 39 46 45 41 37 48 44 30 6 40 36 47 16 38 28 35 32 28 31 11 34 27 33 29 50 51 6 14 2 13 52 8 14 18 5 19 8 12 17 21 10 20 6 23 25 19 21 22 24 6 14 8 3 6 28 53 1 5 4 15 28 17 26 16 9 7
Lift Assembly REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 PART NO. 747-1130 683-0197 711-0332 712-0206 712-0431 712-3004A 712-3083 714-0104 714-0145 716-0106 720-0311 732-0874 732-0934 14 15 16 17 18 19 20 21 22 23 24 25 26 27 736-0275 736-0921 736-3019 736-3084 738-0138 738-0143 741-0225 741-0715 746-0968 747-1111 756-1154 783-0678 783-0720A 710-0260 DESCRIPTION Deck Stabilizer Rod Lift Shaft Assembly Clevis Pin, .5 x .
Model 604 24 43 42 23 19 6 38 21 14 20 4 2 20 13 22 11 18 7 13 22 8 30 13 15 12 42 41 5 28 1 30 2 11 32 35 3 2 35 44 40 45 34 35 32 46 31 33 37 36 29 30 37 29 33 31 27 39 32 10 17 9 16 26 25
Steering Assembly REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 PART NO. 683-0304 710-0604A 783-0726A 783-0727 783-0728 710-0514 711-1409 711-1408 712-0240 712-0241 712-0431 712-0459 712-3004A 717-1550A 717-1554 723-0448A 736-0169 736-3084 738-1001 741-0475 741-0656 738-0372 731-1869 731-1904 638-0019 638-0021 638-0020 638-0022 683-0128A DESCRIPTION Lower Frame Assembly Self-tapping Screw, 16-18 x .
Model 604 4 22 13 5 29 58 21 21 2 2 79 35 13 19 78 13 25 41 87 84 11 18 36 85 57 58 19 28 68 31 7 13 47 69 62 40 8 44 43 19 26 1 42 37 27 24 9 76 13 35 88 12 30 3 32 20 23 10 19 47 34 15 17 49 23 39 14 64 33 75 33 31 21 58 63 53 45 50 70 23 72 54 38 55 73 58 77 65 56 71 61 6 46 58 56 86 60 35 66 59 21 90 69 64 23 83 91 89 52 68 81 12 80 16 32 82
Drive System REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 PART NO.
Model 604 40 12* 31 21 20 29 22 25 26 19 31 30 28 27 15 12c 18 21 39 38 13 38 39 1 3 7 16 8 14 5 23 12c 6 14 12* Units with 618-0307C Transmission ONLY 10 4 17 24 2 9 37 3 13 36 32 37 12* 11 34 12* 14 34 12c
Single-speed Transmission REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12a 12b 12c 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 PART NO.
Model 604 1 2 3 4 43 2 42 13 53 10 14 54 15 55 17 16 5 12 11 5 6 7 8 44 18 19 6 45 9 60 56 39 16 26 48 A 50 50 28 23 51 58 41 52 57 29 23 24 25 1 59 72* 61 62 1 21 Units Equipped w/ Electric PTO 68 1 22 29 1 66 69 63 67 31 38 65 64 37 32 36 28 30 37 65 A 70 (PTO belt for 42" deck shown) 33 49 73* 34 27 47 36 71 35 36 46
Power Take-off System REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 PART NO.
Model 604 46-inch Deck 16 57 See PTO breakdown 40 34 19 57 51 15 19 57 76 61 71 17 72 66 57 50 70 63 80 17 69 79 19 51‡ 81/83 25 7 31 22 38 21 32 24 60 55 32 64 65 32 24 73 54 35 29 30 15 15 19 52 27 12 38 †46-inch Deck Brake Assembly 4 74 44 78 77 19 15 49 1 9 62 35 23 29 62 9 56 30 53 75 49 58 59 68 67 67 ‡ A double-pulley spindle is found in this location on 46-inch decks 14 engaged by electric PTOs only. Use 618-0240 on manual PTO decks.
Cutting Decks REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 PART NO.
Model 604 11 (for choke) 7 9 37 13 9 Briggs & Stratton Intek Twin 22 3 35 4 12 2 (for throttle) 20 19 18 21 6 10 5 8 10 5 17 10 5 14 16 (deflector must face forward) 1 15 37 38 (for choke) 7 9 13 9 19 Kohler Single-cylinder 18 36 20 3 2 21 21 25 26 24 27 28 14 1 23 40 (deflector must face forward)
Engine Accessories 34 9 13 Briggs & Stratton Intek Single 4 32 31 9 37 3 29 19 20 18 2 21 5 10 30 6 33 14 28 REF. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 PART NO. 710-0148 710-0599 710-0604A 710-1237 710-1314 710-1315 712-3017 721-0460 726-0205 736-0119 736-0300 751B221535 751-0535 751-0564 751-0616 751-0650 751-0651 751-3140 751-3141 REF. NO. 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 DESCRIPTION Self-tapping Screw, #8-32 x .375 Self-tapping Screw, 1/4-20 x .
Electrical System Model 604 1 8 14 20 10 18/19 9 16 15 3 11 5 13 4 2 17 6 5 13 5 7 Electric PTO harness shown. Manual PTO harness will vary slightly REF. PART NO. NO. 1 625-0051 2 629-0939 629-0944 3 629-0126 4 710-0599 5 712-3006 6 725-1426 7 725-1657A 8 725-1741 9 725-1743 10 725-1745 11 725-1747 12 736-0222 13 736-0329 14 629-0309 15 725-1752 16 783-0462 17 725-3007A 18 729-0357 19 725-1381 20 629-0924 DESCRIPTION Bulb/Socket Headlight Assembly Wiring Harness w/o Ref.
Notes 43
MANUFACTURER’S LIMITED WARRANTY FOR: The limited warranty set forth below is given by MTD PRODUCTS INC (“MTD”) with respect to new merchandise purchased and used in the United States, its possessions and territories. MTD warrants this product against defects in material and workmanship for a period of two (2) years commencing on the date of original purchase and will, at its option, repair or replace, free of charge, any part found to be defective in material or workmanship.
