OWNER’S MANUAL Safety, Assembly, Operating, and Maintenance Instructions and ILLUSTRATED PARTS MANUAL Model MB (18 HP) ™ Please Read and Save These Instructions For Safety, Read All Safety and Operation Instructions Prior to Operating Machine Effective Date: 09-01-06 P/N 4000-3
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 customers. If for any reason this product does not perform to your expectations, please contact us at (970) 221-5614. Every customer is important to us. Your satisfaction is our goal. Please. . .
Table of Contents Owner’s Manual General Information ________________ 3 HIGHLIGHTED INFORMATION _____________ GLOSSARY ____________________________ IDENTIFYING NUMBER LOCATIONS________ ENGINE SERIAL NUMBER LOCATION ______ SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS ______________ 3 3 3 4 Specifications 4 _______________________ 5 Component Identification ___________ 8 Safety Instructions _________________ 11 BEFORE OPERATING ___________________ OPERATING ___________________________ MAINTENANCE
Table of Contents REPLACING/REPAIRING ________________ Drive Belts __________________________ Engine/PTO Belt ____________________ Ground Drive Belt ___________________ Fuel Filter ___________________________ Blade Overload Shear Bolts ____________ PTO Shear Pin _______________________ Mower Blades ________________________ ADJUSTMENTS ________________________ Transmission Control _________________ Steering Lever Position Adjustment _____ Steering Handles Adjustment __________ Neutral Position Adjustment ___
General Information HIGHLIGHTED INFORMATION Walker Manufacturing recommends that any service 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 operation or maintenance of a Walker Mower are caused by disregarding basic safety precautions or specific warnings. Such accidents, in most cases, can be prevented by being aware of the dangers present.
General Information Serial Number Tractor Serial Number Location Serial Number Engine Serial Number Location SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS Serial Number Mower Deck Serial Number Location ENGINE SERIAL NUMBER LOCATION The Briggs & Stratton engine model, type, and code numbers are located on the left hand of the engine shroud. For the mower model covered by this manual, contact a Briggs & Stratton servicing dealer.
Specifications MODEL MB ENGINE Manufacturer/Model Briggs & Stratton Vanguard, 2 Cyl. OHV (Air-Cooled) Displacement 34.7 cu. in. (570 cc) HP (@ 3600 RPM) 18.0 Max. RPM (No Load) 3600 ± 100 Governed RPM 3600 ± 100 Max. Torque [ft-lb (N⋅ m) @ RPM] 29.5 (40.5) @ 2400 Idle RPM 1750 Spark Plug Type Champion RC14YC Spark Plug Gap .030 in. (.75 mm) Crankcase Capacity 1.5 qts (1.
Specifications MODEL MB TRANSMISSION (continued) Neutral Transmission Release by Manual Dump Valve Final Drive Direct Drive Axle from Transaxle 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) Reverse m.p.h.
Specifications MODEL MB DIMENSIONS (continued) 48 in. (122 cm) SD Model (with Deflector) 53-3/4 in. (137 cm) 56 in. (142 cm) SD Model (with Deflector) 61-3/4 in. (157 cm) 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. (3 to 10 cm) Height Adjustment 7 Positions - 1/2 in.
Component Identification NOTE: Control Identification shown in Operating Instructions section.
Component Identification Oil Fill Fuel Filter Oil Dipstick Tailpipe Fuel Pickup Line Muffler Cylinder Head Cooling Fins Left Hand Drive Wheel Fuel Tank and Cap Tailwheel Fork and Wheel Rear View and Left Side View 9
Component Identification Steering Levers Dampening Springs LH Transmission Control Arm RH Transmission Control Arm LH Transaxle Expansion Reservoir RH Transaxle Expansion Reservoir LH Transaxle RH Transaxle RH Transaxle Lockout Rod LH Transaxle Lockout Rod Parking Brake Linkage Positive (+) Battery Cable Negative (-) Battery Cable Fuel Tank Fuel Pump Fuel Tank Cap Parking Brake PTO Clutch Lever Flexible PTO Spider Coupling Fuel Filter Air Cleaner Cover Latch Fuel Pickup Line Oil Fill Air Cleane
Safety Instructions Pay particular attention to any information labeled DANGER, WARNING, CAUTION, IMPORTANT, and NOTE in this manual. When you see the Safety Alert Symbol ( ), read, understand, and follow the instructions. Failure to comply with safety instructions may result in personal injury.
Safety Instructions 6. 7. 8. 9. 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. Prolonged exposure to loud noise can cause impairment or loss of hearing. Operator hearing protection is recommended.
Safety Instructions 9. 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. 16. In case of a clogged or plugged mower deck: 10. Avoid sudden starts or stops. Before backing the machine up, look to the rear to be sure no one is behind the machine. Watch carefully for traffic when crossing or working near roadways. 11.
Safety Instructions 5. If the engine must be running to perform a maintenance adjustment, keep hands, feet, and clothing away from moving parts. Do not wear jewelry or loose clothing. 6. Always use the proper engine service manual when working on the engine. Unauthorized maintenance operations or modifications to the engine may result in unsafe operating conditions. 7.
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.
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.
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. IMPORTANT: Make sure battery is securely mounted in the frame. A loose battery may cause damage to the case resulting in acid leakage and severe damage to the machine.
Assembly Instructions PTO Shaft Guard Installation Mower Deck Installation on Tractor Position the shaft guard as shown and mount with two 1/4-20 x 1/2 in. bolts. Deck Installation 1. Lightly grease each deck support arm (2) on the tractor. Refer to Mower Deck Installation photo for location of deck support arm. 2. Engage the deck carrier frame tube sockets on the tractor support arms (refer to PTO Shaft Guard Installation photo for socket location).
Assembly Instructions Spring Tension Adjustment Nut Located Under Lower Spring Hook (not visible) Counterweight Springs Clip Onto Body With Body Tilted Up 5. Raise mower body (instead of lifting the front of deck) and clip the counterweight springs to the receptacle on front of body. Lower the body to tension the springs. (Refer to Deck Counterweight Spring Installation photo.) 6. With the counterweight springs connected, the weight on the deck caster wheels should be 15 to 25 Ib (6.8 to 11.3 kg).
Assembly Instructions Deck Leveling 1. 2. Check the side-to-side level. Rotate each blade sideways and measure the distance from blade tip to ground on each side. If measurements vary more than 1/8 in. (3 mm), add a washer shim under the deck support pins on the low side to level the deck. 3. Check the front-to-rear level. Rotate the blades to point forward. Measure the distance from blade tip to ground on the front and rear. The rear of the blade should be 1/8 to 1/4 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 checked. (For a mower with frequent operation, some of these items will not need to be checked every day, but the operator should be aware of the condition of each.
Assembly Instructions DANGER Handle gasoline with care. Gasoline is highly flammable and its vapors are explosive. Use safe refueling procedures: • DO NOT fill fuel tank with the engine running. • If the engine is hot, allow to cool before refueling. • Use an approved fuel container. • Fuel the mower outdoors. • DO NOT smoke while refueling. • Avoid spilling fuel; use a funnel or spout. • DO NOT overfill the fuel tank; fill up to about 1 in. (25 mm) below the top of tank.
Assembly Instructions CHECK MOWER BLADE CONDITION, SHARPNESS, AND SECURITY OF MOUNTING The blade mounting nut should be tightened to 60 ftlb (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 REQUIRED Tilt-Up Latch Deck Secured in Tilt-Up Position Position the hitch pins in the four deck support pins. Refer to the “Cutting Height Adjustment” decal on the deck gearbox cover.
Operating Instructions CONTROL IDENTIFICATION, LOCATION, AND FUNCTION seconds. If the engine does not start, return the key 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. Release the key when the engine starts, and it will return to the RUN position. To stop the engine, rotate the key counterclockwise to the “O” position.
Operating Instructions Engine Choke Forward Speed Control (FSC) 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. As soon as possible, move the choke to the OFF position. A warm engine requires little or no choke for starting.
Operating Instructions Parking Brake Hourmeter The parking brake functions by locking a detent arm into the transaxle outer control gear teeth. Moving the lever FORWARD engages the parking brake; moving the lever BACKWARD releases the brake. The hourmeter, which is located on the right front of the body, displays operating time accumulated while the ignition switch is in the ON position. IMPORTANT: Stop the tractor completely before engaging the parking brake.
Operating Instructions The Forward Speed Control also Establishes the Neutral-Park Position of the Steering Levers LEFT WHEEL STEERING LEVER FORWARD SPEED CONTROL LEVER (FSC) RIGHT WHEEL STEERING LEVER Full Forward Ground Speed Position Forward Position (No Control Change) Intermediate Ground Speed Position Neutral-Park Position Neutral-Park Position Reverse Drive Wheel Motion Position Engaged Position PARKING BRAKE Fast Throttle Position Disengaged Position Engaged Position Idle Position THRO
Operating Instructions STARTING THE ENGINE IMPORTANT: DO NOT crank the engine continuously for more than 10 seconds at a time. If the engine does not start, turn the key to the OFF position and allow a 60 second cool-down period between starting attempts. Failure to follow these guidelines can damage the starter motor and shorten battery life. CAUTION Before operating the mower, read and understand all Safety Instructions and Operating Instructions. 3.
Operating Instructions WARNING Beginning Recommendations are: ♦ Learn operation of the mower in an open area away from buildings, fences, and obstructions. Learn operation on flat ground BEFORE operating on slopes. In case either of the transmission drive belts break during operation, and if the machine is on a slope, the machine will freewheel down the slope. To maintain control, immediately (1) Release the steering levers and simultaneously (2) Move the FSC to the NEUTRAL-PARK position.
Operating Instructions 3. Reverse direction of the mower by pulling both levers backward. NOTE: Smooth action on the steering levers will produce smooth mower operation. Remember to keep the engine and ground speed slow until learning the control response. 4. The FSC may be adjusted forward for faster ground speed and backward for slower ground speed. When mowing, ground speed should be adjusted to match the load on the cutter blades, i.e.
Operating Instructions CAUTION If the cutting blades strike a stationary object while mowing, stop the mower immediately, disconnect the spark plug wires, lift the deck, and inspect the deck and blades thoroughly for damage. Make sure that the blade timing has not been disturbed (the blades should be at 90 degrees to each other). Refer to REPLACING/REPAIRING the Blade Overload Shear Bolts in Maintenance Instructions if blades are out of time.
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. Hydro Lockout Rod To move the mower with the engine NOT running (dead battery, maintenance, etc.), the transaxles are unlocked (released). 1. Raise the body. 2. Pull up the transaxle lockout rods on both the RH and LH transaxles and secure into place by shouldering both rods in the chassis notch area. 3.
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. Maximum Recommended Side Slope - Do Not Operate on Steep Slopes • Avoid damage to the grass by slipping and skidding of the drive tires.
CAUTION Maintenance Instructions Maintenance procedures requiring special training or tools should be performed by a trained technician. MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MB Service Item Daily 25 Hours 50 Hours 100 Hours 250 Hours Ref.
Maintenance Instructions IMPORTANT TIPS FOR CARE OF THE BRIGGS & STRATTON ENGINE Fuel System • Fuel must be clean - free from water, dirt, and organic 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). This will aid starting, especially in cold weather. • Keep the battery fully charged.
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 above the FULL mark on the dipstick. WARNING DO NOT attempt to lubricate the machine with the engine running. Disengage the PTO clutch, shut off the machine, and remove the ignition key. Proper lubrication is an important maintenance procedure. It reduces wear and makes the machine quieter and easier to operate.
Maintenance Instructions 3. Remove the dipstick and oil drain plug, and drain oil into a suitable container. Be sure to allow ample time for complete drainage. 4. Before removing the oil filter, clean the area around the filter to keep dirt and debris out of the engine. 5. Remove the old oil filter and wipe off the filter mounting surface on the engine. Oil Fill Dipstick Dipstick and Oil Fill (view from above left side of tractor) LUBRICATION 7. Install the new oil filter on the engine.
Maintenance Instructions Ident No.
Maintenance Instructions 1 LUBRICATION 2 1 3 2 4 5 6 4 7 7 7 6 7 8 20 & 24 9 10 11 11 12 12 22 & 23 13 14 15 16 22 17 18 21 20 19 Chassis and Deck Lubrication Points 39
Maintenance Instructions LUBRICATION 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.
Maintenance Instructions LUBRICATION/CLEANING Drain Plugs Use 3/8" hex wrench to remove filter Transaxle Oil Filter Location Transaxle Drain Plugs (view from underside of tractor) CLEANING 3. Reinstall drain plugs. Engine Air Cooling System 4. Place 6” (15 cm) block under the left hand drive wheel. 5. Fill the transaxles with 20W-50 (API Service Class SL or higher) oil through the reservoir. Fill up to the opening. 6.
Maintenance Instructions CAUTION Operating the engine with a blocked air intake screen, dirty or plugged cooling fins, and/or cooling shrouds removed will cause engine damage from overheating. Clean these areas of dirt and debris CLEANING NOTE: Washing the element in water or cleaning solution is not recommended. Replace the element if it does not clean up with compressed air. • Use a bright light inside the element to inspect for damage.
CLEANING/ CHECKING/SERVICING Maintenance Instructions 1. 2. Raise the deck lock lever handle on each side of the carrier frame and pull out to release carrier frame for tilting action. Using the carrier frame lift handle, raise deck to the TILT-UP position and insert the deck hook into the tilt-up latch on the tractor body.
Maintenance Instructions Security of Air Cleaner System NOTE: The following inspection is only an external inspection and should be done without “disturbing” the filtration components. On a daily basis, visually inspect the external condition of the air cleaner cover. Check for damage. Make sure the cover is in place and the cover latches are secure - do not run the engine without the air cleaner cover in place and secure.
Maintenance Instructions 3. CHECKING/SERVICING Check the blades for straightness by marking the blade tip position inside the deck housing, and then rotating the opposite end of the blade to the same position and comparing. If the difference in blade tip track is more than 1/8 in. (3 mm), the blade is bent and should be replaced. Sharpen at Original 30° Angle 30° Wing Tip Do Not Grind or Sharpen on Underside WARNING Mower Blade Profile For Sharpening DO NOT try to straighten a blade that is bent.
CHECKING/SERVICING/ REPLACING/REPAIRING Maintenance Instructions Spark Plugs Every 100 hours, remove the spark plugs, inspect, clean, and reset the gap (or replace with a new plug). Clean spark plug with a wire brush. If the electrodes are burned short or pitted, replace the plug (refer to Specifications for the proper type of replacement plug). Check the spark plug gap with a wire-type feeler gauge and set the gap between 0.028 and 0.032 in. (0.7 and 0.8 mm). Reinstall and tighten to 17 ft-lb (23 N·m).
Maintenance Instructions REPLACING/REPAIRING Engine/PTO Belt 1. To remove the engine/PTO belt: a. Loosen and remove idler tension bolt and jam nut. b. Relax belt by depressing idler arm. c. Roll the belt off the pulley and remove the belt. Idler Arm Jam Nut Idler Tension Bolt Engine/PTO Belts PTO Pulley Engine/PTO Belt (Disengaged) (Engine Hidden for Clarity) 2. Reverse the removal procedure to replace the engine belt. 1/2" (1.
Maintenance Instructions REPLACING/REPAIRING Ground Drive Belt 1. b. To remove the ground drive belt: a. Slide belt off pulleys, then release the idler. Raise the spring-loaded idler to relax belt. RH Transaxle Ground Drive Belt LH Transaxle Drive Pulley Tension Spring Idler Pulley Hydro Idler Arm Raise Idler Pulley to Relax Belt Ground Drive Belt Assembly (Disengaged) 2. Reverse the procedure to install the ground drive belt.
Maintenance Instructions REPLACING/REPAIRING Fuel Filter Blade Overload Shear Bolts Model MB is equipped with an in-line fuel filter. Visually inspect the filter periodically, and replace the filter yearly. The cutting blade is keyed to the blade hub by two (2) shear bolts (10-24 x 5/8 in. stainless steel machine screws). These bolts are designed to shear and protect the blade drive gearbox from damage if the blade encounters a shock load.
Maintenance Instructions 2. Rotate U-joint on shaft to align the shear pin hole with the hole (and shear pin fragment) in the shaft. Use a punch to drive the remaining portion of the old shear pin out. 3. Install new shear pin and secure with cotter pin.
Maintenance Instructions ADJUSTMENTS ADJUSTMENTS 2. Transmission Control IMPORTANT: The proper adjustment of the transaxle control stops is essential for efficient operation and life of the transaxle. These stops are properly adjusted at the factory and should only require readjustment if the transaxle or related control linkage is removed or changed. Adjust the position of the RH lever by turning the stop bolt in the Speed Control Actuator in or out.
Maintenance Instructions ADJUSTMENTS Neutral Position Adjustment - Step 3 1. With the Forward Speed Control (FSC) in neutral, the lever should be straight up. Adjust by loosening the jam nuts on the FSC Rod and turn the rod to attain the straight up position. Tighten the jam nuts. Actuator Rod Length Adjustment 3. Block the tractor up so the drive tires are off the ground. 4. With the FSC in neutral, start the engine.
Maintenance Instructions 6. One at a time adjust the left and right Control Rods to find the center of the neutral window. Shorten the rods until the drive tire turns forward then lengthen it until the drive tire turns in reverse (approximately 1 turn). Position the rods 1/2 way between forward and reverse. Tighten the jam nuts. 7. Lower drive tires onto ground. ADJUSTMENTS 3.
Maintenance Instructions Neutral Switch Adjustment - Step 6 1. ADJUSTMENTS 2. With the steering levers held back, move the FSC lever back from the forward position. With a proper amount of friction adjusted, the FSC lever should move back with a slight amount of resistance (friction). If the FSC lever movement is "stiff", the friction needs to be decreased. 3. The FSC friction is increased or decreased by tightening or loosening the friction adjustment nut.
ADJUSTMENTS/ ELECTRICAL SYSTEM Maintenance Instructions PTO Belt Tension PTO belt tension can be adjusted by lengthening or shortening the position of the adjustment bolt on the idler adjuster (above idler pulley). Optimum adjustment will result in a 1/2 (1.27 cm) deflection of the belt. 4 (10.2 cm) 1/2 (1.
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:,5,1* 6&+(0$7,& ,7(0 3$57 12 12 '(6&5,37,21 1 2 5(4·' ,7(0 3$57 12 12 WALKER MODEL MB Beginning S/N 2007-85248 '(6&5,37,21 RELAY - A RELAY - C IGNITION RELAY IGNITION RELAY IGNITION SWITCH CIRCUITS OFF OFF 30 + 87A OFF 30 + 87A START START 30 + 87 START 30 + 87 RUN RUN PTO ON 30 + 87 30 + 87A RUN PTO ON 30 + 87 30 + 87A RELAY - B 30 + 87A 30 + 87 RUN PTO ON 30 + 87 30 + 87A OFF PUR B + A / S1 + S2 B+A PUR 30 86 ORG G+M S1 = START CIRCUIT S2 = START
LIMITED WARRANTY FOR WALKER MODEL MB RIDER MOWER 1. 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 rental purposes, in which case this warranty is limited to ninety (90) days.
Lwa 97 Sound - Model MB Vibration - Model MB Sound Test Vibration Level Sound test conducted was in accordance with 2000/14/EC and was performed on 31 May 05 under the conditions listed: 0.6g Vibration levels at the operators handles were measured in the vertical, lateral, and longitudinal directions using calibrated vibration test equipment.
