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- Lawn Mower
- MDD
- Owner's Manual
Walker MDD Owner's Manual
Summary of MDD
Page 1
Owner’s manual safety, assembly, operating, and maintenance instructions model mdd (20.9 hp diesel) please read and save these instructions effective date: 02-15-05 for safety, read all safety and operation p/n 7000-8 instructions prior to operating machine ™.
Page 2: Foreword
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 (97...
Page 3: Table Of Contents
Table of contents general information ________________ 1 highlighted information _____________ 1 glossary ____________________________ 1 identifying number locations________ 1 engine serial number location ______ 2 servicing of engine and drivetrain components ______________ 2 specifications _______...
Page 4: Table Of Contents
Table of contents maintenance instructions __________ 46 maintenance schedule chart _______ 46 important tips for care of the kubota engine _______________ 47 fuel system _________________________ 47 starting/stopping _____________________ 47 cooling system ______________________ 47 air cleaner syst...
Page 5: General Information
General information 1 highlighted 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- a...
Page 6: General Information
General information 2 tractor serial number location mower deck serial number location engine serial number location refer to the engine manual that accompanies this manual for the location of the engine serial number. For the mower model covered by this manual, an en- gine manual is available cover...
Page 7: Specifications
Specifications 3 model mdd engine manufacturer/model kubota d722, 3 cyl., diesel (liquid cooled) displacement 44.0 cu. In. (722 cc) hp (@ 3600 rpm) 20.9 max. Rpm (no load) 3800 governed rpm 3600 max. Torque [ft-lb (n·m) @ rpm] 34 (46.1) @ 2600 idle rpm 1000 ± 50 spark plug type n/a spark plug gap n/...
Page 8: Specifications
Specifications 4 model mdd transmission (continued) service brake dynamic braking through hydrostatic transmission parking brake mechanical pin lock in transmission gear neutral transmission release by manual dump valve final drive gear drive axle transmission fluid factory service mobil 1 synthetic...
Page 9: Specifications
Specifications 5 model mdd dimensions (tractor and mower)* length 91 in. (231 cm) width 49 in. (124 cm) height 44 in. (112 cm) wheel base (tractor) 42-1/4 in. (107 cm) tread width (tractor) 29-3/4 in. (76 cm) mower deck width of cut sd/ghs 42 or 48 in. (107 or 122 cm) cutting height 1 to 4 in. (3 to...
Page 10: Specifications
Specifications 6 model mdd drive belts engine pto walker p/n 7230 jackshaft drive gates 3vx355 (p/n 6231) ground drive walker p/n 7248 blower (ghs model) gates 3vx280 (p/n 7234-1) ghs system (optional) blower 4 x 10 x 1/4 in. (10 x 25 x 1 cm) three-blade paddle wheel (driven by mower engine) blower ...
Page 11: Component Identification
Component identification 7 front view and right side view note: control identification shown in operating instructions section. Catcher door safety latch grass handling system 9.5 bushel catcher tilt-up latch counterweight spring and protective cover deck support pins and height adjustment hitch pin...
Page 12: Component Identification
Component identification 8 left hand drive wheel instrument panel box (shock mounted) instrument panel guard catcher lift / dump handle radiator catcher door gas spring removable grass catcher screen (not visible) catcher exhaust deflector catcher door catcher door handle dump plate anti-scuff rolle...
Page 13: Component Identification
Component identification 9 donaldson air cleaner air cleaner cover radiator guard radiator ghs blower rh hydrostatic transmission neutral safety switch battery negative (-) battery cable air restriction indicator precleaner tube jackshaft pto gearbox dipstick turbine precleaner rh transmission locko...
Page 14: Component Identification
Component identification 10 exhaust manifold oil fill cap alternator water temperature gauge sender thermostat housing and thermostat radiator screen (removable) radiator fan and shield engine stop lever linkage (fuel shut-off valve) throttle control linkage lever injection pump injectors air intake...
Page 15: Safety Instructions
Safety instructions 11 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. Fail- ure to comply with safety instructions may result in personal injury...
Page 16: Safety Instructions
Safety instructions 12 6. 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 l...
Page 17: Safety Instructions
Safety instructions 13 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. 10. Avoid sudden starts or stops. Before backing the machine up...
Page 18: Safety Instructions
Safety instructions 14 maintenance 1. To prevent accidental starting of the engine when servicing or adjusting the machine, re- move the key from the ignition switch and dis- connect the electrical plug on the fuel shut-off solenoid. 2. To reduce fire hazards, keep the engine free of grass, leaves, ...
Page 19: Safety Instructions
Safety instructions 15 adjacent to blower discharge chute through body (5804) sd deck discharge shield (5848) front body adjacent to rh steering lever (7818) hydrostat oil reservoir (5810-2) on body adjacent to clutch control lever (5806) right side of front body, below front body latch release (782...
Page 20: Safety Instructions
Safety instructions 16 instrument panel (7823-4) fender, rh side (7802) catcher door hinge bar, lh and rh sides (5868) left side of operator seat (7819) right side, below operator seat (7809) top of blower housing (5819) deck carrier frame (8653) jackshaft support adjacent to dipstick (7827) gear ax...
Page 21: Assembly Instructions
Assembly instructions 17 setup instructions walker mowers are shipped partially assembled. After uncrating the tractor and mower deck, initial setup is required. Note: during the process of unpacking, any dam- aged or missing parts should be noted and reported to the delivering carrier immediately (...
Page 22: Assembly Instructions
Assembly instructions 18 battery charging 1. Charge the battery at 15 amps for 10 minutes. Do not exceed 20 amps maximum recom- mended charging rate. Charge until specific gravity is at least 1.250. Total charging time should not exceed one (1) hour. 2. After charging the battery, adjust the electro...
Page 23: Assembly Instructions
Assembly instructions 19 deck caster wheel installation note: if semi-pneumatic wheels are installed, make sure the spacer washers fit over the spacer tube and are not caught between the fork and the end of the tube. The washers should move freely on the axle spacer tube. 5. Grease the caster wheel ...
Page 24: Assembly Instructions
Assembly instructions 20 tilt-up spring and roller wheel installation on rear discharge deck mower deck installation on tractor deck installation 1. Lightly grease each deck support arm (2) on the tractor. Refer to mower deck installation photo on next page for location of deck support arm. 2. Engag...
Page 25: Assembly Instructions
Assembly instructions 21 6. Raise the front mower body (instead of lifting the front of deck) and clip the counterweight springs to the receptacle on front of body. Lower the front body to tension the springs. (refer to deck counterweight spring instal- lation photo.) mower deck installation (pto sh...
Page 26: Assembly Instructions
Assembly instructions 22 deck leveling 1. 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 27: Assembly Instructions
Assembly instructions 23 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 ope...
Page 28: Assembly Instructions
Assembly instructions 24 check hydrostatic transmission oil level refer to lubrication for checking hydrostatic transmission fluid level in maintenance instruc- tions . Check battery electrolyte level refer to checking/servicing the battery in maintenance instructions . Check functions of instrument...
Page 29: Operating Instructions
Operating instructions 25 control identification, location, and function operating controls engine throttle the throttle control lever (red knob) is located on the left side of the seat and is used to control engine speed. Moving the lever forward toward the fast position increases engine speed; mov...
Page 30: Operating Instructions
Operating instructions 26 forward speed control (fsc) forward speed control (fsc) has two functions: one is to set forward travel speed, and the other is to establish the neutral-park position. When the fsc lever is moved into the forward posi- tion, a friction lock holds any forward speed setting f...
Page 31: Operating Instructions
Operating instructions 27 transmission lockout levers the transmission lockout levers disengage the hy- drostatic transmissons. By lifting the lever on top of the transmission and locking it into place with the lockout cam, the hydrostatic transmissions are re- leased to permit freewheeling. By rele...
Page 32: Operating Instructions
Operating instructions 28 throttle blade clutch (pto) pull up to engage parking brake left wheel steering lever reverse drive wheel motion position right wheel steering lever the forward speed control also establishes the neutral-park position of the steering levers forward speed control lever (fsc)...
Page 33: Operating Instructions
Operating instructions 29 instrument panel instrument panel this illustration shows the configuration of the switches and indicators located on the instrument panel. Light switch (optional) hourmeter circuit breaker - 10 amp (headlights, safety interlock switch system, fuel solenoid hold, powerfil ®...
Page 34: Operating Instructions
30 operating instructions voltmeter the voltmeter displays battery and charging system voltage. An indication of low or high voltage (the red area) indicates an electrical system failure. The cause of the failure should be determined and cor- rected. Water temperature gauge the water temperature gau...
Page 35: Operating Instructions
Operating instructions 31 light switch (for optional lights) operates headlights (when installed). Hourmeter the hourmeter displays operating time accumu- lated while the ignition switch is in the on position. The hourmeter provides maintenance reminders after certain hours of operation. The hourmet...
Page 36: Operating Instructions
Operating instructions 32 1. Before attempting to start the engine, make sure the operator is in the seat, the forward speed control is in neutral-park position, and the blade clutch and parking brake are disengaged. Note: release parking brake to prevent extra load on the starter if the transmissio...
Page 37: Operating Instructions
Operating instructions 33 adjusting ground speed and steering important: if the dsd52 or dsd62 mower deck is installed on the tractor, make sure the dolly wheel is retracted before moving. 1. Move the fsc out of neutral-park position to the desired forward speed. Do not hold forward on steering leve...
Page 38: Operating Instructions
Operating instructions 34 correct operator hand position on the controls 3. Reverse direction of the mower by pulling both levers backward. Note: smooth action on the steering levers will produce smooth mower operation. Remem- ber to keep the engine and ground speed slow until learning the control r...
Page 39: Operating Instructions
Operating instructions 35 blade clutch engaged blade clutch disengaged stopping the machine 1. Slow the engine to a fast idle; put the throttle in the 1/2 throttle position. 2. Pull the steering levers to the neutral position and then move the fsc lever backward to the neutral-park position. 3. Dise...
Page 40: Operating Instructions
Operating instructions 36 cutting height is adjusted by positioning the four re- tainer hitch pins in a series of seven vertical holes on the deck support pins. Lift handles have been pro- vided on each end of the deck to assist in raising the deck while positioning the hitch pins. Cutting heights r...
Page 41: Operating Instructions
Operating instructions 37 recommendations for mowing important: operate the engine at full speed when mowing, to allow the engine to produce full horsepower and to increase efficiency of the engine cooling system. • keep the mower deck and discharge chute clean. • mow with sharp blades. A dull blade...
Page 42: Operating Instructions
Operating instructions 38 recommendations for tilt-up deck operation/transport to avoid potential deck and/or tractor damage while using the tilt-up deck, the following recommenda- tions are offered: • do not move the tractor with the deck in the tilt- up position since both the roller wheels (on th...
Page 43: Operating Instructions
Operating instructions 39 grass handling system (ghs) ghs model only pto and blade gear drive rear discharge mower deck deck discharge chute blower body chute assembly powerfil ® delivery spout dump handle grass catcher catcher door exhaust deflector grass-pak ® vane switch exhaust screen (removable...
Page 44: Operating Instructions
Operating instructions 40 general information the grass handling system (ghs) consists of a rear discharge mower deck connected to a 10 in. (25 cm) blower and a rear mounted grass catcher with 7.0 bushel (246 liters) capacity or optional 9.5 bushel (335 liters) capacity. The ghs blower oper- ates an...
Page 45: Operating Instructions
Operating instructions 41 clogging checklist in case of clogging, there will be a distinct change in the sound of the blower, i.E., the blower sound will stop. Also, the mower deck will begin to leave a trail of grass clippings. When this occurs, stop the engine, disconnect the electrical plug on th...
Page 46: Operating Instructions
Operating instructions 42 • check that the openings in the removable air exhaust screen in the grass catcher are not plugged. If the screen is clogged, refer to cleaning the ghs exhaust screen in this section. Remember, anything that restricts airflow or material flow along the entire path from the ...
Page 47: Operating Instructions
Operating instructions 43 grass catcher screen removal for cleaning dumping the catcher for dumping, the catcher either tailgate dumps into a disposal area or dumps into the optional dump bag. The dump bag is a reusable nylon fabric bag designed to conveniently move grass clippings from the catcher ...
Page 48: Operating Instructions
Operating instructions 44 3. Hook the bottom of the bag over the rear bumper while lifting on the handle strap. 4. Tilt the catcher back to dump into the bag by lifting on the catcher lift handle on the lower front corner of the catcher with the one hand while continuing to hold up on the bag strap ...
Page 49: Operating Instructions
Operating instructions 45 power dump components fork power dump ram actuator rear body panel, rh lift channel cable guide grass catcher door actuator arm catcher door gas spring catcher door cable rod guide cable assembly rear body panel, lh gas spring actuator mount assembly dog leg assembly rubber...
Page 50: Maintenance Instructions
Maintenance instructions 46 maintenance schedule chart - recommended service intervals - model mdd service item daily 25 hours 100 hours 200 hours yearly every 2years ref. Page check engine crankcase oil level x 48 check coolant level in radiator and overflow tank x 60 clean radiator screen and cool...
Page 51: Maintenance Instructions
Maintenance instructions kubota tips 47 important tips for care of the kubota engine fuel system • fuel must be clean - free from water, dirt, and or- ganic material. Fuel contamination will greatly short- en the life of the fuel injection pump and injectors. • change fuel filters on a regular basis...
Page 52: Maintenance Instructions
Maintenance instructions lubrication 48 lubrication proper lubrication is an important maintenance pro- cedure. It reduces wear and makes the machine quieter and easier to operate. Engine oil engine break-in oil no special break-in oil is required. The engine is serviced with 10w-30, service class s...
Page 53: Maintenance Instructions
Maintenance instructions lubrication 49 oil drain location (view from left side of tractor) 4. Before removing the oil filter, clean the area around the filter to keep dirt and debris out of the engine. Oil filter location 5. Remove the old oil filter and wipe off the filter mounting surface on the ...
Page 54: Maintenance Instructions
Maintenance instructions lubrication 50 ident lubrication no. No. Location type places ident lubrication no. No. Location type places 'hfn&dvwhu:khho)run3lyrw *uhdvh %odgh'ulyh*hduer[ 2lo 7hh*hduer['hfn 2lo 'hfn&dvwhu:khho%hdulqj*uhdvh 8qlyhuvdo-rlqw6kdiw$vvhpeo\ *uhdvh 3lyrw$vvhpeo\7low8s'hfn *uhdv...
Page 55: Maintenance Instructions
Maintenance instructions lubrication 51 2 2 3 4 4 13 13 12 12 9 10 11 15 16 14 18 18 20 21 22 19 17 23 24 23 & 32 25 25 26 28 27 30 30 29 31 1 1 5 7 7 8 8 6 6 6 6 chassis and deck lubrication points.
Page 56: Maintenance Instructions
Maintenance instructions lubrication 52 mower deck gearbox lubrication note: these instructions apply to all mower decks with gear-driven blades. Refer to dsd52 or dsd62 mower deck lubrication in this section for the dsd52 or dsd62 deck with belt-driven blades. The mower deck gearboxes (tee gearbox ...
Page 57: Maintenance Instructions
Maintenance instructions lubrication 53 2. Check the oil level in the belt drive gearbox every 100 hours (or sooner if a visible oil leak has developed). With the deck in the normal operating position, remove the level plug in the side of the gearcase. Add sae e.P. (extreme pressure) 90w oil to main...
Page 58: Maintenance Instructions
Maintenance instructions lubrication 54 hydrostatic transmission fluid checking hydrostatic transmission fluid level hydrostatic transmission fluid level should be checked every 25 hours of machine operation. It is preferable to check the fluid level when fluid is cold. Check fluid level as follows:...
Page 59: Maintenance Instructions
Maintenance instructions cleaning 55 cleaning engine air cleaner system there are two main components in the engine air cleaner system: a turbine precleaner and a donald- son radialseal™ air cleaner. Each component is checked, cleaned and maintained on a different schedule based on the filtering act...
Page 60: Maintenance Instructions
Maintenance instructions cleaning 56 donaldson radialseal™ air cleaner a remote mounted donaldson radialseal™ air cleaner provides the air filtering function. The paper filter element slides over an outlet tube inside the air cleaner canister with radial sealing action, eliminat- ing the possibility...
Page 61: Maintenance Instructions
Maintenance instructions cleaning 57 4. 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 necessary. 5. Check the condition and resilience of the radial ...
Page 62: Maintenance Instructions
Maintenance instructions cleaning 58 note: directing pressurized air or water from the fan side of the radiator outward is recom- mended to dislodge material packed on the out- side of the cooling fins. Do not use cold water on a hot radiator. Flushing radiator and changing coolant change engine coo...
Page 63: Maintenance Instructions
Maintenance instructions cleaning 59 4. Lower the deck to the normal operating position and re-engage the deck lock levers. Ghs blower normally, the ghs blower operates with no mainte- nance or cleaning. However, when mowing grass that is dirty and damp (especially springtime mow- ing), a deposit of...
Page 64: Maintenance Instructions
60 maintenance instructions cleaning/ checking/servicing important: in case an oil leak develops on the input shaft, the cooling fan blowing dusty air and oil on the transmission will quickly pack the cooling fins with oily dirt. If this condition occurs, replace the seal immediately to avoid overhe...
Page 65: Maintenance Instructions
61 maintenance instructions checking/servicing security of air filtration components note: the following inspection is only an exter- nal inspection and should be done without “dis- turbing” the filtration components. On a daily basis, visually inspect the external condi- tion of the complete air cl...
Page 66: Maintenance Instructions
62 maintenance instructions checking/servicing sharpen mower blades check mower blade(s) for straightness, sharp- ness, condition of the cutting edge, and balance every 10 hours of operation (or more often when mowing abrasive type grass or operating on sandy soils). Replace blades if worn, bent, cr...
Page 67: Maintenance Instructions
63 maintenance instructions checking/servicing blade balanced on magnetic wall-mounted balancer 7. Mount the blade with wing tips pointing up into the housing. Reinstall the blade, washer, lock washer, and nut. Tighten the nut to 60 ft-lb (81.3 n·m). Note: when reinstalling blades on ghs models, rem...
Page 68: Maintenance Instructions
Maintenance instructions replacing/repairing 64 replacing/repairing important: always use genuine factory re- placement parts. Substitute parts can result in product malfunction and possible injury to the oper- ator and/or others. Drive belts there are five (5) individual belts on ghs models or four...
Page 69: Maintenance Instructions
Maintenance instructions replacing/repairing 65 engine pto drive belt (3 groove power band) 1. To remove the engine pto drive belt: a. Remove the jackshaft drive belt from its idler pulley (by pushing down on cold start lever) and let the belt drop down out of the way. Note: step (a) is not essentia...
Page 70: Maintenance Instructions
Maintenance instructions replacing/repairing 66 jackshaft drive belt 1. To remove the jackshaft drive belt: a. Relax the belt by releasing spring tension from the jackshaft drive idler arm using the cold start lever. Jackshaft drive belt (engaged) jackshaft drive belt (disengaged) cold start lever (...
Page 71: Maintenance Instructions
Maintenance instructions replacing/repairing 67 ghs blower drive belt 1. Remove the ghs blower drive belt tension by depressing the idler pulley on the tightener arm. Roll the belt off the blower pulley. The belt should be clear of the blower pulley, allowing free movement of the blower wheel. Blowe...
Page 72: Maintenance Instructions
Maintenance instructions replacing/repairing 68 hydrostatic ground drive belt 1. To remove the hydrostatic ground drive belt: a. Raise the spring-loaded belt tightener arm and idler pulley to relax belt. B. Slide belt off pulleys, then release the idler. Transmission drive pulley spring idler pulley...
Page 73: Maintenance Instructions
Maintenance instructions replacing/repairing 69 engine fan belt 1. To remove the fan belt: a. Loosen the alternator mounting pivot bolt and the alternator bracket tensioner bolt. B. Pivot the alternator as shown to relax and remove belt. Alternator bracket crankshaft pulley engine fan belt tensioner...
Page 74: Maintenance Instructions
Maintenance instructions replacing/repairing 70 fuel filter model mdd has two (2) fuel filters. Replace both the in-line filter and the kubota filter element every 400 hours of operation. Fuel filter location important: replace fuel filters only in a clean area where the fuel line and connections wi...
Page 75: Maintenance Instructions
Maintenance instructions replacing/repairing 71 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. This system provides prima- ry shock protection in case of blade impact and will normally shear before the indivi...
Page 76: Maintenance Instructions
72 maintenance instructions replacing/repairing/ adjustments reinstall the blades following procedure from sharpen mower blades instructions in checking/ servicing in this section. If blades are replaced, always use walker original equipment blades to ensure safety and optimum performance. The quali...
Page 77: Maintenance Instructions
Maintenance instructions adjustments 73 1. Position the discharge chute so that it is point- ing straight back. A. Turn the ignition switch on and move the blade clutch to the engaged position (engine not running). B. Open the catcher back door and monitor the spout position (as it oscillates) and m...
Page 78
74 '$7( 6(59,&( (1*,1( ,7(0 +2856 8vhrqo\jhqxlqh :donhu uhsodfhphqwsduwv 0$,17(1$1&($1'6(59,&(5(&25'6+((7 bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb...
Page 79
75 limited warranty for walker commercial 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) ye...
Page 80
Walker mfg. Co. • 5925 e. Harmony road, fort collins, co 80528 • (970) 221-5614 form no. 021505 printed in usa © 2005 walker mfg. Co sound - model mdd sound test sound test conducted was in accordance with 79/113/eec and was performed on 28 january 98 under the conditions listed: general condition: ...