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OWNER’S MANUAL Safety, Assembly, Operating, and Maintenance Instructions and ILLUSTRATED PARTS MANUAL Model MB (18 HP) ™ Please Read and Save These Instructions Effective Date: 10-01-04 For Safety, Read All Safety and Operation P/N 4000-1 Instructions Prior to Operating Machine Price $5.00...
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Foreword Thank you. . .for purchasing a Walker mower. Every effort has been made to provide you with the most reliable mower on the market, and we are sure you will be among our many satisfied custom- ers. If for any reason this product does not perform to your expectations, please contact us at (970) 221-5614.
General Information • HIGHLIGHTED INFORMATION STEERING LEVERS steer the tractor by con- trolling the two transaxles. Walker Manufacturing recommends that any ser- • vice requiring special training or tools be performed TRACTOR is the prime mover, including the en- by an authorized Walker Mower Dealer. There are gine, drive train, operator seat, and controls to several general practices to be aware of in the area operate the mower.
General Information Serial Number Serial Number Tractor Serial Number Location Engine Serial Number Location SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS The detailed servicing and repair of the engine, tran- saxle and gearboxes are not covered in this manual. Serial Number Only routine maintenance and general service instructions are provided.
Specifications MODEL ENGINE Manufacturer/Model Briggs and Stratton Vanguard, 2 Cyl. OHV (Air-Cooled) Displacement 34.7 cu. in. (570 cc) HP (@ 3600 RPM) 18.0 3600 ± 100 Max. RPM (No Load) 3600 ± 100 Governed RPM ⋅ Max. Torque [ft-lb (N m) @ RPM] 29.5 (40.5) @ 2400 Idle RPM...
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Specifications MODEL TRANSMISSION (continued) Transmission Fluid Factory Service 20W50 Multi-Viscosity Motor Oil (Minimum SL Grade Oil) Transmission Fluid Capacity 79 fl oz (2336 ml) Transmission Cooling Cooling Fan Mounted on Drive Pulley Ground Travel Speed Forward m.p.h. (km/h) 0-8 (0-13) Infinitely Variable Reverse m.p.h.
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Specifications MODEL DIMENSIONS (continued) Height 39 in. (99 cm) Wheel Base (Tractor) 38-1/2 in. (98 cm) Tread Width (Tractor) 29-3/4 in. (76 cm) MOWER DECK Width of Cut 36-, 42-, 48-, or 56-in. (91, 107, 122 or 142 cm) Cutting Height 1 to 4 in.
Component Identification NOTE: Control Identification shown in Operating Instructions section. Tilt-Up Latch Fuel Pickup Line Counterweight Spring and Protective Cover Fuel Tank and Cap Deck Support Deck Support Pin and Height Adjustment Hitch Pins Forward Speed Tilt-Up Control (FSC) Deck Handle Friction Adjustment Deck Support Arm...
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Component Identification Oil Fill Oil Dipstick Muffler Fuel Filter Cylinder Head Cooling Fins Left Hand Tailpipe Drive Wheel Electric Clutch Tailwheel Fork and Wheel PTO Belt Left Hand Protective Cover Transaxle Rear View and Left Side View...
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Component Identification Steering Levers LH Transmission Dampening Springs Control Arm RH Transmission Control Arm RH Transaxle Expansion LH Transaxle Reservoir Expansion and Hose Reservoir and Hose RH Transaxle LH Transaxle RH Transaxle Lockout Rod LH Transaxle Lockout Rod Parking Brake Positive (+) Parking Brake Battery Cable...
Safety Instructions Pay particular attention to any information labeled Walker Manufacturing cannot predict every poten- DANGER, WARNING, CAUTION, IMPORTANT, tially dangerous situation. Therefore, items labeled and NOTE in this manual. as such in this manual do not cover all conceivable situations.
Safety Instructions Do not wear loose fitting clothing that could get 12. The electrical system battery contains sulfuric caught in moving parts. Do not operate this acid. Avoid any contact with skin, eyes, and machine while wearing shorts; always wear clothing.
Safety Instructions Watch for holes, rocks, and roots in the terrain 16. In case of a clogged or plugged mower deck: and for other hidden hazards. When mowing Disengage the blade clutch (PTO) and turn tall grass, mow higher than desired to expose the engine off before leaving the seat.
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Safety Instructions If the engine must be running to perform a main- 11. Use care when charging the battery or per- tenance adjustment, keep hands, feet, and forming maintenance on the battery and clothing away from moving parts. Do not wear electrical system: jewelry or loose clothing.
Safety Instructions SAFETY, CONTROL, AND INSTRUCTION DECALS Safety, Control, and Instruction Decals are installed on the machine; if any are missing, illegible, or damaged, a replacement should be ordered and installed before putting the machine into operation. The Decal Part Number is listed below and in the Parts Section. Each End of Mower Deck (5808) SD Deck Discharge Shield (5848) LH Fender (5802-2)
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Safety Instructions SAFETY, CONTROL, AND INSTRUCTION DECALS Safety, Control, and Instruction Decals are installed on the machine; if any are missing, illegible, or damaged, a replacement should be ordered and installed before putting the machine into operation. The Decal Part Number is listed below and in the Parts Section. Front Body Adjacent to LH Steering Lever (7818) Upper Guard...
Assembly Instructions SETUP INSTRUCTIONS Walker Mowers are shipped partially assembled to our distribution network, and are typically assembled by the selling dealer. For any additional assembly besides the following, contact your Walker dealer. Battery Service The battery is a completely sealed, non serviceable battery.
Assembly Instructions PTO Shaft Guard Installation Mower Deck Installation on Tractor Deck Installation Position the shaft guard as shown and mount with two 1/4-20 x 1/2 in. bolts. Lightly grease each deck support arm (2) on the tractor. Refer to Mower Deck Installation photo for location of deck support arm.
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Assembly Instructions Spring Tension Adjustment Nut Located Under Lower Spring Hook (not visible) Counterweight Springs Clip Onto Body With Body Tilted Up Hitch Pins Lock Deck On Support Arms Deck Counterweight Spring Installation Raise mower body (instead of lifting the front of deck) and clip the counterweight springs to the receptacle on front of body.
Assembly Instructions Check the side-to-side level. Rotate each blade Deck Leveling sideways and measure the distance from blade Position mower on a smooth, level surface. Set tip to ground on each side. If measurements the cutting height to the highest position - 4 in. vary more than 1/8 in.
Assembly Instructions PREOPERATING CHECKLIST Before operating the mower for the first time, and as a routine before daily operations, it is important to make sure the mower is properly prepared and ready for operation. The following is a list of items to be Body Rod checked.
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Assembly Instructions CHECK ENGINE COOLING SYSTEM DANGER Check that the engine cooling air intake screen is free of obstruction by grass clippings or debris and clean Handle gasoline with care. Gasoline is high- if required. Also, cylinder head cooling fins should be ly flammable and its vapors are explosive.
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Assembly Instructions CHECK MOWER BLADE CONDITION, SHARP- NESS, AND SECURITY OF MOUNTING The blade mounting nut should be tightened to 60 ft- lb (81.3 N ⋅ m). If blade sharpening is required, refer to CHECKING/SERVICING for Sharpen Mower Blades in Maintenance Instructions. ADJUST MOWER CUTTING HEIGHT, IF RE- QUIRED Position the hitch pins in the four deck support pins.
Operating Instructions CONTROL IDENTIFICATION, LOCATION, AND seconds. If the engine does not start, return the key FUNCTION to the “O” position for at least 60 seconds before making a restart attempt. Prolonged cranking can damage the starter motor and shorten battery life. CAUTION Release the key when the engine starts, and it will return to the RUN position.
Operating Instructions Engine Choke Forward Speed Control (FSC) The choke control lever (black knob) is located on Forward Speed Control (FSC) has two functions: the left side of the seat. To start a cold engine, move One is to set forward travel speed, and the other is the choke control forward to the ON position.
Operating Instructions Parking Brake Hourmeter The hourmeter, which is located on the left front of The parking brake functions by locking a detent arm the body, displays operating time accumulated into the transaxle outer control gear teeth. Moving while the ignition switch is in the ON position. the lever BACKWARD engages the parking brake;...
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Operating Instructions The Forward Speed Control also Establishes the Neutral-Park Position of the Steering Levers FORWARD SPEED LEFT WHEEL RIGHT WHEEL CONTROL LEVER (FSC) STEERING LEVER STEERING LEVER Full Forward Forward Position Ground Speed (No Control Change) Position Intermediate Neutral-Park Ground Speed Position Position...
Operating Instructions STARTING THE ENGINE IMPORTANT: DO NOT crank the engine con- tinuously for more than 10 seconds at a time. If the engine does not start, turn the key to the CAUTION OFF position and allow a 60 second cool-down period between starting attempts.
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Operating Instructions WARNING Beginning Recommendations are: ♦ Learn operation of the mower in an open In case either of the transmission drive area away from buildings, fences, and ob- belts break during operation, and if the structions. Learn operation on flat ground machine is on a slope, the machine will BEFORE operating on slopes.
Operating Instructions Reverse direction of the mower by pulling both IMPORTANT: DO NOT engage the blade clutch levers backward. when transporting the mower across drives, side- walks, loose materials, etc. DO NOT engage the NOTE: Smooth action on the steering levers blade clutch with the PTO shaft disconnected will produce smooth mower operation.
Operating Instructions STOPPING THE MACHINE ADJUSTING CUTTING HEIGHT Slow the engine to idle; put the throttle in the WARNING IDLE position. Pull the steering levers to the NEUTRAL-PARK The engine must be stopped before ad- position and then move the FSC lever backward justing cutting height.
Operating Instructions TRANSAXLE LOCKOUTS IMPORTANT: DO NOT TOW this mower with the transmission lockout engaged. Towing can produce Hydro Lockout Rod excessive internal pressure and damage the transaxle. To move the mower with the engine NOT running (dead battery, maintenance, etc.), the transaxles are unlocked (released).
Operating Instructions • Make sure the mower is leveled properly for a smooth cut. Refer to Deck Leveling in Assembly Maximum Recommended Instructions . Side Slope - Do Not Operate on Steep Slopes • Use an alternating stripe mowing pattern for best appearance and vary the direction of the stripe each time the grass is mowed to avoid wear patterns in the grass.
Maintenance Instructions CAUTION Maintenance procedures requiring special training or tools should be performed by a trained technician. MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MB Ref. Service Item Daily Hours Hours Hours Yearly Page Check Engine Crankcase Oil Level Check/Clean Engine Air Cooling System* Clean Grass Buildup Under Deck Service Mower Blades...
Maintenance Instructions BRIGGS & STRATTON TIPS IMPORTANT TIPS FOR CARE OF THE Air Cleaner BRIGGS & STRATTON ENGINE • Use only Briggs & Stratton air cleaner elements. Aftermarket elements may not seal in the air cleaner Fuel System housing, allowing dirt to enter the engine. Also, af- •...
Maintenance Instructions LUBRICATION LUBRICATION IMPORTANT: DO NOT operate engine without sufficient oil supply in the crankcase. DO NOT operate with oil level below the LOW mark or WARNING above the FULL mark on the dipstick. DO NOT attempt to lubricate the machine with the engine running.
Maintenance Instructions LUBRICATION Remove the dipstick and oil drain plug, and drain Install the new oil filter on the engine. Turn the oil into a suitable container. Be sure to allow oil filter clockwise until the rubber gasket con- ample time for complete drainage. tacts the sealing surface, then tighten the filter an additional 1/2 to 3/4 turn.
Maintenance Instructions LUBRICATION Mower Deck Gearbox Lubrication NOTE: Since the gearboxes are connected as a unit by connector tubes, it is necessary to add The mower deck gearboxes (tee gearbox and blade oil slowly. Allow a few minutes after adding oil drive gearboxes) are connected as a unitized for the oil to flow throughout the assembly and assembly, and oil flows freely between them.
Maintenance Instructions CLEANING CLEANING Clean these areas of dirt and debris Engine Air Cooling System To prevent engine overheating and possible engine damage, clean grass clippings, chaff and dirt from the rotating engine air intake screen every 8 hours of operation.
Maintenance Instructions CLEANING • Use a bright light inside the element to inspect for Using the carrier frame lift handle, raise deck to damage. Check the element very carefully for pin the TILT-UP position and insert the deck hook holes or other damage that will allow dirt to leak into the tilt-up latch on the tractor body.
CLEANING/ Maintenance Instructions CHECKING/SERVICING Transaxle Cooling Fins Security of Air Cleaner System NOTE: The following inspection is only an external Keeping the cooling fins on the transaxles clean and inspection and should be done without “disturb- free of obstruction is essential to avoid overheat- ing”...
Maintenance Instructions CHECKING/SERVICING Check the battery charge by measuring the specific Check the blades for straightness by marking gravity of electrolyte; if specific gravity is less than the blade tip position inside the deck housing, 1.225, the battery will need to be charged as follows: and then rotating the opposite end of the blade to the same position and comparing.
Maintenance Instructions CHECKING/SERVICING Mower Deck Gearbox Oil Seals Intersection The mower deck gearbox seals should be inspected Wear Area every 25 hours for evidence of oil leaking; particu- Sharpen at Original larly the lower oil seal on the blade drive gear- 30°...
CHECKING/SERVICING/ Maintenance Instructions REPLACING/REPAIRING Blade Brake Action REPLACING/REPAIRING DANGER WARNING To prevent accidental starting of the It is important to check and maintain blade engine when replacing parts or repairing brake action for safe operation of the ma- the machine, remove the key from the chine.
Maintenance Instructions REPLACING/REPAIRING Engine/PTO Belt Remove Bolts to Access To remove the engine/PTO belt: Engine/PTO Belt Remove belt guard from underneath muf- fler. Refer to Remove Belt Guard photo. Relax the belt by depressing the spring- loaded idler arm. Roll the belt off the pulley and remove the belt.
Maintenance Instructions REPLACING/REPAIRING Ground Drive Belt Slide belt off pulleys, then release the To remove the ground drive belt: idler. Raise the spring-loaded idler to relax belt. RH Hydro-Gear LH Hydro-Gear Ground Drive Belt Drive Pulley Idler Pulley Tension Spring Raise Idler Pulley to Hydro Idler Relax Belt...
Maintenance Instructions REPLACING/REPAIRING Fuel Filter Blade Overload Shear Bolts The cutting blade is keyed to the blade hub by two Model MB is equipped with an in-line fuel filter. (2) shear bolts (10-24 x 5/8 in. stainless steel ma- Visually inspect the filter periodically, and replace chine screws).
Maintenance Instructions REPLACING/REPAIRING • Rotate U-joint on shaft to align the shear pin hole Examine ends of the blade carefully, especially the with the hole (and shear pin fragment) in the intersection where the flat section of the blade turns shaft.
ADJUSTMENTS/ Maintenance Instructions ELECTRICAL SYSTEM ADJUSTMENTS Tilt-Up Deck Adjustable Stop Steering Levers When the carrier frame hinge joint is properly ad- justed, the deck lock levers should move in and out An adjustment range of approximately 3 inches is of the engaged and disengaged positions freely. All available on the steering levers - the levers can be ad- four hitch pins used for height adjustment should sit justed forward or aft depending on the arm length of...
(/(&75,&$/ $66(0%/< Refer to Body/Chassis Assembly Refer to Main Component Power Transmission F025 F002 F025 Refer to F034 Hydrostatic Ground F349 Drive Assemblies F009 F002 F004 F061 Refer to Body/Chassis F004 F374 Assembly F026 F374 F086 F002 F029 F028 F031 END VIEWS ARE SHOWN FROM BACK OF PLUG DETAIL A DETAIL C...
LIMITED WARRANTY WALKER MODEL MB RIDER MOWER WHAT THIS WARRANTY COVERS, AND FOR HOW LONG: Walker Manufacturing company will, at its option, repair or replace, without charge, any part covered by this warranty which is found to be defective in material and/or workmanship within one (1) year after date of sale to the original retail purchaser unless the product is used for commercial or rental purposes, in which case this warranty is limited to ninety (90) days.
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Sound - Model MB Vibration - Model MB Sound Test Vibration Level Vibration levels at the operators handles were measured in the vertical, lateral, and Sound test conducted was in accordance 0.6g longitudinal directions using calibrated with 79/113/EEC and was performed on 14 vibration test equipment.