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Walker MB (18 HP) Owner's Manual
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Walker MB (18 HP) Owner's Manual

18hp rider lawn mower
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OWNER'S MANUAL
Safety, Assembly, Operating, and Maintenance Instructions
and ILLUSTRATED PARTS MANUAL
Please Read and Save These Instructions
For Safety, Read All Safety and Operation
Instructions Prior to Operating Machine
Model MB (18 HP)
™
Effective Date: 10-01-04
P/N 4000-1
Price $5.00

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  • Page 1 OWNER’S MANUAL Safety, Assembly, Operating, and Maintenance Instructions and ILLUSTRATED PARTS MANUAL Please Read and Save These Instructions For Safety, Read All Safety and Operation Instructions Prior to Operating Machine Model MB (18 HP) ™ Effective Date: 10-01-04 P/N 4000-1 Price $5.00...
  • Page 2 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.

  • Page 3: Table Of Contents

    Table of Contents Owner’s Manual General Information ________________ 3 HIGHLIGHTED INFORMATION _____________ 3 GLOSSARY ____________________________ 3 IDENTIFYING NUMBER LOCATIONS________ 3 ENGINE SERIAL NUMBER LOCATION ______ 4 SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS ______________ 4 Specifications _______________________ 5 Component Identification Safety Instructions _________________ 11 BEFORE OPERATING ___________________ 11 OPERATING ___________________________ 12...
  • Page 4 Table of Contents ADJUSTMENTS ________________________ 51 Steering Levers ______________________ 51 Tilt-Up Deck Adjustable Stop ___________ 51 ELECTRICAL SYSTEM __________________ 51 Illustrated Parts Manual TRACTOR DECALS _____________________ 52 BODY / CHASSIS ASSEMBLY ____________ 54 MAIN COMPONENT POWER TRANSMISSION ________________ 56 ENGINE GROUP _______________________ 58 HYDROSTATIC GROUND DRIVE ASSEMBLIES ____________________ 60 STEERING CONTROL ASSEMBLIES_______ 62...

  • Page 5: General Information

    Walker Manufacturing recommends that any ser- vice requiring special training or tools be performed by an authorized Walker Mower Dealer. There are several general practices to be aware of in the area of safety. Most accidents associated with the oper-...

  • Page 6: Engine Serial Number Location

    If you have any difficulty finding an authorized outlet or obtaining war- ranty service, please contact our Service Department for assistance: Walker Manufacturing Company 5925 E. Harmony Road Fort Collins, CO 80528 1-970-221-5614 Service manuals are available for each of these...

  • Page 7: Specifications

    Specifications MODEL ENGINE Manufacturer/Model Displacement HP (@ 3600 RPM) Max. RPM (No Load) Governed RPM Max. Torque [ft-lb (N m) @ RPM] Idle RPM Spark Plug Type Spark Plug Gap Crankcase Capacity Crankcase Lubricant Fuel Tank Capacity Fuel Cooling System ELECTRICAL SYSTEM Battery Charging System...
  • Page 8 Specifications MODEL TRANSMISSION (continued) Transmission Fluid Factory Service Transmission Fluid Capacity Transmission Cooling Ground Travel Speed Forward m.p.h. (km/h) Reverse m.p.h. (km/h) BLADE DRIVE PTO Shaft Blade Spindle Blade Drive Clutch and Brake Max. Blade Speed [22 in. (56 cm) Blade] @ 3600 RPM Engine TIRE SIZE Deck Caster Wheel...
  • Page 9 Counterweight Springs 564 lb (256 kg) 709 lb (322 kg) 744 lb (337 kg) 769 lb (349 kg) Walker P/N 4230 Walker P/N 4248 Contour-Molded, with Nylon Backed Vinyl Cover and Integral Foam Cushion 3/16 Plate Steel 11 Gauge Steel...

  • Page 10: Component Identification

    Component Identification Fuel Pickup Line Fuel Tank and Cap Forward Speed Control (FSC) Friction Adjustment Deck Support Arm Deck Lift Handle (Cutting Height Adjustment) Deck Discharge Shield Tilt-Up Latch Tilt-Up Hook Footrests Front View and Right Side View NOTE: Control Identification shown in Operating Instructions section.
  • Page 11 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...
  • Page 12 Component Identification LH Transmission Control Arm LH Transaxle Expansion Reservoir and Hose LH Transaxle LH Transaxle Lockout Rod Positive (+) Battery Cable Negative (-) Battery Cable Fuel Pump Fuel Filter Air Cleaner Cover Oil Fill Oil Dipstick Rubber Bumpers (Body Support) LH Tail Weight Steering Levers Dampening Springs...

  • Page 13: Safety Instructions

    Any person using procedures, tools, or control techniques not recommended by Walker Manufacturing must take full responsibility for safety. The Walker Rider Lawnmower has been designed with many safety features to protect the operator from personal harm or injury. However, it is necessary for the operator to use safe operating procedures at all times.

  • Page 14: Operating

    Safety Instructions Do not wear loose fitting clothing that could get caught in moving parts. Do not operate this machine while wearing shorts; always wear adequate protective clothing, including long pants. Wearing safety glasses, safety shoes, and a helmet is advisable and required by some local ordinances and insurance regulations.

  • Page 15: Maintenance

    Safety Instructions Watch for holes, rocks, and roots in the terrain and for other hidden hazards. When mowing tall grass, mow higher than desired to expose any hidden obstacles. Then, clean the area and mow to the desired height. 10. Avoid sudden starts or stops. Before backing the machine up, look to the rear to be sure no one is behind the machine.
  • Page 16 Safety Instructions If the engine must be running to perform a main- tenance adjustment, keep hands, feet, and clothing away from moving parts. Do not wear jewelry or loose clothing. Always use the proper engine service manual when working on the engine. Unauthorized maintenance modifications to the engine may result in...

  • Page 17: Safety, Control, And Instruction Decals

    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)
  • Page 18 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...

  • Page 19: Assembly Instructions

    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.

  • Page 20: Pto Shaft Guard Installation

    Assembly Instructions PTO Shaft Guard Installation Position the shaft guard as shown and mount with two 1/4-20 x 1/2 in. bolts. Carrier Frame Tube Sockets PTO Shaft Guard Installation Tilt-Up Roller Wheel Installation NOTE: A 2-1/2" diameter tilt-up roller wheel (P/N 9772) is required for decks installed on the Model MB tractor.
  • Page 21 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.

  • Page 22: Deck Leveling

    Assembly Instructions Deck Leveling Position mower on a smooth, level surface. Set the cutting height to the highest position - 4 in. (102 mm) - for easy access under the deck to measure blade height. Refer to ADJUSTING CUTTING HEIGHT in Operating Instructions. NOTE: A block of wood cut 4 in.

  • Page 23: Preoperating Checklist

    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 checked.
  • Page 24 Also, cylinder head cooling fins should be inspected and cleaned if any build-up of debris is noted. Contact your Walker dealer to perform this procedure. CHECK SECURITY OF DRIVE TIRE MOUNT-...
  • Page 25 Assembly Instructions Tilt-Up Latch Deck Secured in Tilt-Up Position CAUTION Do not operate machine with deck tilt-up pivot joint unlocked. DANGER Do not operate the mower with deck in tilt- up position. Do not move the tractor with the deck in the tilt-up position. CHECK MOWER BLADE CONDITION, SHARP- NESS, AND SECURITY OF MOUNTING The blade mounting nut should be tightened to 60 ft-...

  • Page 26: Operating Instructions

    Operating Instructions CONTROL IDENTIFICATION, LOCATION, AND FUNCTION CAUTION Before operating the mower, become fa- miliar with the location and function of all operator controls. Knowing the location, function, and operation of these controls is important for safe and efficient opera- tion of the mower.

  • Page 27: Engine Choke

    Operating Instructions Engine Choke The choke control lever (black knob) is located on the left side of the seat. To start a cold engine, move the choke control forward to the ON position. After engine starts, move choke control toward the OFF position, keeping enough choke to allow the engine to run smoothly as it warms up.

  • Page 28: Parking Brake

    (one hour prior to and one hour after the recommended interval). This reminder is only used one time. 100-hour intervals are acceptable. Walker and the engine manufacturers recommend engine oil changes every 50 hours in extremely dirty or dusty conditions or for units with less than 100 hours annual use.
  • Page 29 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...

  • Page 30: Starting The Engine

    Operating Instructions STARTING THE ENGINE CAUTION Before operating the mower, read and un- derstand all Safety Instructions and Operat- ing Instructions. WARNING NEVER run the engine in an enclosed or poorly ventilated area. Engine exhaust contains carbon monoxide, an odorless and deadly gas.
  • Page 31 Control setting until familiar with all operat- ing characteristics. Remember it is not necessary to hold the steering levers forward (a unique Walker feature); always PULL on the levers for steering or for reverse motion of the mower. Learn to operate the mower with your left hand on the steering levers and right hand on Forward Speed Control.

  • Page 32: Engaging The Mower

    NOTE: If the tractor creeps forward or back- ward with the FSC lever in the NEUTRAL-PARK position, the transmission control needs to be adjusted. Contact your Walker Dealer. ENGAGING THE MOWER Set the engine throttle at about 1/2 speed. DO NOT attempt to engage the blade clutch at high engine speeds.

  • Page 33: Stopping The Machine

    If the brake system malfunctions and the blades do not stop within five (5) seconds, the brake should be repaired or replaced before operating the mower. Contact your Walker Dealer. Turn the ignition switch OFF. WARNING Remove the key from the ignition switch when leaving the mower unattended.

  • Page 34: Transaxle Lockouts

    Operating Instructions TRANSAXLE LOCKOUTS IMPORTANT: DO NOT TOW this mower with the transmission lockout engaged. Towing can produce 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).

  • Page 35: Recommendations For Tilt-Up Deck Operation/Transport

    Operating Instructions Make sure the mower is leveled properly for a smooth cut. Refer to Deck Leveling in Assembly Instructions . 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.

  • Page 36: Maintenance Instructions

    Maintenance Instructions MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MB Service Item Check Engine Crankcase Oil Level Check/Clean Engine Air Cooling System* Clean Grass Buildup Under Deck Service Mower Blades Check Security of Air Cleaner System Lubricate Grease Fittings and Oil Points* Check Transaxle Fluid Check Tire Pressure Check Drive Belts (Engine, PTO, Ground Drive)

  • Page 37: Important Tips For Care Of The Briggs & Stratton Engine

    Maintenance Instructions IMPORTANT TIPS FOR CARE OF THE BRIGGS & STRATTON ENGINE Fuel System Fuel must be clean - free from water, dirt, and or- ganic material. Clean the fuel filter on a regular basis and when contamination is suspected or found in the fuel. Starting Start engine with the throttle advanced off idle (1/4 to 1/2 throttle).

  • Page 38: Lubrication

    Maintenance Instructions LUBRICATION WARNING DO NOT attempt to lubricate the machine with the engine running. Disengage the PTO clutch, shut off the machine, and re- move the ignition key. Proper lubrication is an important maintenance pro- cedure. It reduces wear and makes the machine quieter and easier to operate.

  • Page 39: Grease Fitting And Oil Point Lubrication

    Maintenance Instructions Remove the dipstick and oil drain plug, and drain oil into a suitable container. Be sure to allow ample time for complete drainage. Before removing the oil filter, clean the area around the filter to keep dirt and debris out of the engine.
  • Page 40 Maintenance Instructions Ident Location Lubrication Ident Type Places LUBRICATION Lubrication Location Type Places...
  • Page 41 Maintenance Instructions 21 & 24 18 & 23 Chassis and Deck Lubrication Points LUBRICATION...

  • Page 42: Mower Deck Gearbox Lubrication

    Maintenance Instructions Mower Deck Gearbox Lubrication The mower deck gearboxes (tee gearbox and blade drive gearboxes) are connected as a unitized assembly, and oil flows freely between them. The gearboxes are permanently lubricated (oil filled) and sealed requiring no scheduled lubrication. However, the gearbox oil seals should be checked every 25 hours for indication of an oil leak;...

  • Page 43: Cleaning

    Maintenance Instructions CLEANING 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. In certain mowing conditions (dry grass, leaves, tree "cotton", etc.) it may be necessary to check and clean this area several times each day to prevent engine overheating.

  • Page 44: Grass Buildup In Mower Housing

    Maintenance Instructions Use a bright light inside the element to inspect for damage. Check the element very carefully for pin holes or other damage that will allow dirt to leak through the paper media. Replace element if nec- essary. Use a clean, damp cloth and wipe the interior of the air cleaner air cleaner body clean.

  • Page 45: Transaxle Cooling Fins

    Maintenance Instructions Transaxle Cooling Fins Keeping the cooling fins on the transaxles clean and free of obstruction is essential to avoid overheat- transmission fluid transmission life. The cooling fins should be checked every 100 hours; and cleaned if necessary. To clean the fins, use compressed air and/or a pres- sure washer.

  • Page 46: Tire Pressure

    Maintenance Instructions Check the battery charge by measuring the specific gravity of electrolyte; if specific gravity is less than 1.225, the battery will need to be charged as follows: Charge the battery at 15 amps for 10 minutes. DO NOT exceed 20 amps maximum recommended charging rate.

  • Page 47: Drive Belts

    Maintenance Instructions Intersection Wear Area Sharpen at Original 30° Angle 30° Do Not Grind or Sharpen on Underside Mower Blade Profile For Sharpening Blade Balancer Blade Balanced on Magnetic Wall-Mounted Balancer Mount the blade with wing tips pointing up into the housing.

  • Page 48: Blade Brake Action

    Maintenance Instructions Blade Brake Action WARNING It is important to check and maintain blade brake action for safe operation of the ma- chine. Check the function of the cutter blade brake by engaging the blade clutch (PTO), operating the engine at full throttle, then disengaging the clutch and measuring how quickly the blades stop.

  • Page 49: Engine/Pto Belt

    Maintenance Instructions Engine/PTO Belt To remove the 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.

  • Page 50: Ground Drive Belt

    Maintenance Instructions Ground Drive Belt To remove the ground drive belt: Raise the spring-loaded idler to relax belt. LH Hydro-Gear Ground Drive Idler Pulley Reverse the procedure to install the ground drive belt. LH Hydro-Gear Idler Pulley Belt Raise Idler Pulley to Hydro Idler Relax Belt Ground Drive Belt Assembly (Disengaged)

  • Page 51: Fuel Filter

    After reinstalling the blade, check blade timing by moving blades through one (1) complete revolu- tion. Make sure blade tips pass clear of each other. If timing is incorrect, contact your Walker Dealer. PTO Shear Pin The PTO drive shaft connection to the deck gearbox has a shear pin to provide shock load protection to the mower deck drive.

  • Page 52: Mower Blades

    Split Spring Pin Shaft Assembly Cotter Pin PTO Shear Pin IMPORTANT: Use only Walker P/N 8067-13 shear pins for replacement to provide proper shock protection -- these pins are hardened to shear under a specific amount of load. Reinstall the PTO shaft guard.

  • Page 53: Adjustments

    Maintenance Instructions ADJUSTMENTS Steering Levers An adjustment range of approximately 3 inches is available on the steering levers - the levers can be ad- justed forward or aft depending on the arm length of the operator. The levers can be adjusted by loosen- ing the locknut at the pivot point and the locknut hold- ing the lever in position in the adjustment slide.

  • Page 54: Tractor Decals

    ITEM PART DESCRIPTION LOCATION REQ’D SD Use only genuine Walker® replacement parts. Effective Date 10-01-04...
  • Page 55 Refer to Decks Parts Manual for Deck Decals Effective Date 10-01-04 Use only genuine Walker® replacement parts.

  • Page 56: Body / Chassis Assembly

    ITEM PART DESCRIPTION ITEM PART DESCRIPTION REQ’D REQ’D Use only genuine Walker® replacement parts. Effective Date 10-01-04...
  • Page 57 Effective Date 10-01-04 F227 F009 F025 F002 F009 F120 F004 F004 F127 F023 F034 F009 F005 F028 F034 F002 F037 F004 F029 F009 F034 F009 F128 F113 F190 F025 F029 F292 F048 F393 F013 Use only genuine Walker® replacement parts. F016 F048...

  • Page 58: Main Component Power Transmission

    ITEM PART DESCRIPTION ITEM PART DESCRIPTION REQ’D REQ’D Use only genuine Walker® replacement parts. Effective Date 10-01-04...
  • Page 59 F013 F067 Effective Date 10-01-04 F063 F012 F151 F042 F063 F013 F012 F135 F038 F038 F038 F034 F013 F076 F009 F387 F278 F041 F051 F042 F051 F051 F171 Refer to Body / Chassis Assembly Use only genuine Walker® replacement parts.
  • Page 60 ITEM PART DESCRIPTION ITEM PART DESCRIPTION REQ’D REQ’D...
  • Page 61 F184 F185 Refer to Hydrostatic Ground Drive Assemblies F050 F164 F201 F050 F002 F255 F185 F184 F005 F002 F025 F050 F004 F037 F392 F002 F050 F004 F009 F032 F009 F050 F004 F050 F179 F316 F004 Refer to Body / Chassis Assembly F009 F009...
  • Page 62 ITEM PART DESCRIPTION ITEM PART DESCRIPTION REQ’D REQ’D...

  • Page 63: Engine Group

    F029 F004 F004 F005 F034 F151 F042 F029 F009 F013 F067 F012 F005 F051 F171 F040 F171 F069 F031 F069 F005 F004 F004 F009 F069 F029 F111 F111 Refer to Engine Group F066 F151 F173 F067 Refer to Body / Chassis Assembly F012 F069...

  • Page 64: Steering Control Assemblies

    ITEM PART DESCRIPTION ITEM PART DESCRIPTION REQ’D REQ’D Use only genuine Walker® replacement parts. Effective Date 10-01-04...

  • Page 65: Hydrostatic Ground

    F312 Refer to Hydrostatic Ground F146 Drive Assemblies F391 F009 F010 F146 F391 F008 Refer to Hydrostatic Ground Drive Assemblies F320 F352 F003 F287 Refer to Body / Chassis Body / Chassis Assembly Assembly Use only genuine Walker® replacement parts.

  • Page 66: Electrical Assembly

    ITEM PART DESCRIPTION ITEM PART DESCRIPTION REQ’D REQ’D Use only genuine Walker® replacement parts. Effective Date 10-01-04...
  • Page 67 F086 F002 F028 DETAIL D DETAIL E DETAIL F PUR\WHT BRN\WHT Refer to Main Component Power Transmission F009 Refer to Body/Chassis F004 Assembly F029 F031 DETAIL G DETAIL H RED/WHT BRN/WHT RED/WHT Use only genuine Walker® replacement parts. DETAIL I...

  • Page 68: Wiring Schematic

    DU@H ÃQ6SU 9@T8SDQUDPI ÃIP ÃÃIP RED/WHT INTERLOCK CLUTCH SWITCH Use only genuine Walker® replacement parts. Ã Ã I PÃ Ã Ã Ã Ã Ã Ã DU@H S@R·9 ÃIP ELECTRIC CLUTCH RED/YEL SEAT SWITCH NEUTRAL SWITCH 15 AMP CIRCUIT BREAKER RED/YEL...

  • Page 69: Operator's Notes

    Effective Date 10-01-04 Use only genuine Walker® replacement parts.
  • Page 70 DATE SERVICE ENGINE ITEM HOURS Use only genuine Walker® replacement parts. Effective Date 10-01-04...

  • Page 71: Warranty

    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.
  • Page 72 < 5 mph (< 8 kmh) OPERATOR Humidity: Barometric Pressure: 24.9" HG (759 mm Hg) WALKER MFG. CO. 5925 E. HARMONY ROAD, FORT COLLINS, CO 80528 (970) 221-5614 FORM NO. 040104 PRINTED IN USA 0.6g Tests were performed on 14 July 04 under the...

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