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CLEANING. Walker DSD56, MB | Manualzz

Maintenance Instructions

Oil Filter

Oil Filter


Oil Drain


Transaxle Oil Drain Plug, Filter, and

Guard Location

(Shown with Deck Support Arms

Removed for Clarity)

3. Reinstall drain plugs.

4. Remove the oil reservoir hose attached to the elbow on top of the transaxles and remove the elbows to access the oil fill openings.

5. Fill the transaxles with 20W-50 (API Service

Class SL or higher) oil through the opening where the elbows were. Fill up to the opening.

6. Before reinstalling the elbows, screw the locking nut on the elbows down until they are snug

(the o-ring on the elbow will be to the bottom of the o-ring groove).

7. Reinstall the elbows. When the elbow begins to be snug, position the elbow as it was when removed and tighten the locknut.

8. Fill reservoir to 1/4-1/2 in. (6-13 mm) with

20W-50 (API Service Class SL or higher) oil.

9. Start and drive the unit for 1 - 2 minutes.

10. If the transaxles sound noisy or have poor steering response, recheck oil level in both transaxles by removing the elbows (check oil level at fill opening).

11. If oil needs to be added refer back to steps 4-10.




If a pressure washer is used on the exposed working parts, avoid water on the electrical parts and the engine cooling system.

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. Also, visually check inside cylinder head shroud and between cylinder head fins for material packed in this area which would prevent cooling airflow; remove shroud and clean as required.

IMPORTANT: Yearly or every 100 hours, remove engine cooling shroud and clean cylinder head cooling fins to prevent overheating. Make sure cooling shroud is reinstalled properly.

Rotating Engine Screen

Keep Engine Screen Clean



Maintenance Instructions



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

Check Airflow with Hand

Clean Cooling Fins and Fan - Model MBV

Cylinder Head Cooling Fins

It is essential for performance and longevity of the air-cooled engine to keep the cylinder head cooling fins clean and free of obstruction. After every 8

hours of operation, check the performance of the cooling system by starting the engine, holding a hand adjacent to the cylinder head, and feeling the cooling airflow. If there is little or no airflow, clean the cooling fins as follows:


Make sure to keep hands clear of exhaust pipe, muffler, and moving parts when checking airflow.

Cooling System Airflow

Every 100 hours, inspect and clean the cooling fins

(more often when operating in extremely dusty, dirty conditions). Remove the two (2) cooling fin access panels in the engine shroud and clean the cooling fins and external surfaces using compressed air.

Make sure to reinstall the access panels before oper ating the engine.

Engine Cooling

Fin Access Panels

Engine Air

Intake Screen

Kohler Engine


Engine Air Intake Screen and Cooling Fin Access Panels

Maintenance Instructions

Engine Air Cleaner System

Cummins/Fleetguard OptiAir™ Air Cleaner

A remote mounted Cummins/Fleetguard OptiAir™ 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, eliminating the possibility of dust leaks due to improper filter installation. Intake design, internal baffling, and a dust ejection valve provide dust separation and automatic precleaning action. Daily or frequent servicing of the air cleaner is not

required. Use the air restriction gauge on the air cleaner outlet to indicate when the air filter needs servicing -- a red flag will appear when the filter is overly restricting airflow into the engine.

IMPORTANT: Use only Cummins/Fleetguard air filter elements for replacement (Walker 2090-1 or

2090-3). Aftermarket filters may not seal properly or filter efficiently.


IMPORTANT: The Cummins/Fleetguard air cleaner uses a dry paper-type air filter element.

NEVER apply oil to the paper element.

Air Restriction


Push Button to Reset

Indicator After Service

Air Restriction Gauge Location

Air Cleaner



Air Cleaner



Air Cleaner



Air Cleaner Cover

Dust Ejection




Air Restriction







Engine Air Cleaner System Components



Maintenance Instructions

Inspect the paper element after every 100 hours of service and replace the element and safety filter

yearly (or when dirty or damaged). More frequent replacement may be required when operating in extremely dusty conditions as indicated by the air restriction gauge. Service the air cleaner as follows:

1. Lift Mono Latch Twist Lock™ and twist the

OptiAir™ cover to the left into the “open” position to remove the air cleaner cover. Wash the cover and dust ejection valve. Check that these components are in good condition. The dust ejection valve is subject to wear and deterioration and should be replaced yearly or when damaged. The lips of the valve should close and fit together; any cracks, deformation, or wear in the valve is cause for replacement.

2. Remove the filter element by pulling it out of the canister. There will be some initial resistance as the filter seal breaks loose and slides off of the outlet tube. Gently move the end of the filter up and down and side to side or twist to loosen the seal. Use gentle action to minimize the amount of dust dislodged as the filter is removed.

3. Replace the filter element.

NOTE: Washing the element in water or cleaning solution is not recommended. Do not try to clean the element with compressed air.

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. Without removing, visually inspect the condition of the safety filter for damage or holes. The safety filter should only be removed for yearly replacement (or when dirty or damaged).

6. Check the condition and resilience of the radial sealing surface (inside of the open end) of the filter. Replace the filter if any cracks, tears, or other damage to the sealing surface are noted.

7. Use a clean, damp cloth and wipe the interior of the air cleaner canister clean. Use special care to clean both the inside and outside surfaces of the outlet tube.

IMPORTANT: Any dust left on the inside of the outlet tube will go into the engine and cause wear.


8. Check the outside surface of the outlet tube for smoothness and cleanness (this is the sealing surface).

9. Insert and seat the safety filter and OptiAir™ el ement carefully into the canister, applying pres sure at the outer rim of the filter; not at the flexible center. Make sure the filter element is completely in place before installing the cover.

NOTE: DO NOT use petroleum based lubricants on the sealing surfaces of the filter; use tal cum powder or dry silicone lubricants if required for filter installation.


Filter Element


Radial Sealing


Safety Filter

Air Filter Element Replacement

Maintenance Instructions

10. Install the cover with the word “DOWN” properly oriented to the bottom of the canister. Twist the

OptiAir™ cover to the right and put into the

“closed” position.

Mono Latch

Twist Lock™


2 3


Tilt-Up Latch

Orient to Bottom of Canister

Dust Ejection


Proper Orientation of Air Cleaner Cover

11. Check the air intake hose for cuts, nicks, cracks, etc., and the hose clamps for tightness.

12. Reset the air restriction indicator (press button on the end of indicator).

Grass Buildup in Mower Housing


Before raising or removing the mower deck for cleaning, stop the engine, re move the ignition key, and disconnect the spark plug wires.

1. Raise the deck lock lever handle on each side of the carrier frame and pull out to release carrier frame for tilting action.

2. 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.

Deck Secured in TILT-UP Position


Do not operate the mower with deck in tiltup position. Do not move the tractor with the deck in the tilt-up position.

3. Clean grass buildup underneath the deck using a pressure washer (and scraper if required).

NOTE: If the buildup is severe, it may be easier to clean the deck by removing the deck assembly from the tractor and standing the desk assembly on its “nose”.

NOTE: While some degree of material buildup in the mower deck housing can be tolerated, a point is finally reached where cutting quality

deteriorates and clogging begins to occur because of too much buildup on the baffling and housing.

4. Lower the deck to the normal operating position and re-engage the deck lock levers.


Do not operate machine with deck tilt-up pivot joint unlocked.



Maintenance Instructions

Transaxle Cooling Fins

Keeping the cooling fins on the transaxles clean and free of obstruction is essential to avoid overheat-

ing the transmission fluid and short ening transmission life. The cooling fins should be checked every

100 hours; and cleaned if neces sary.

To clean the fins, use compressed air and/or a pressure washer. The cooling fins extend all the way around the housing -- the fins underneath need to be clean as well as the more visible fins above. Also, pay close attention to the area under the drive pulley.

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, contact your dealer immediately to avoid overheating and dam aging the transaxles.

An additional procedure in maintaining transaxle cooling is to inspect the cooling fans. Replace the fan(s) if blades are missing or damaged.



Transaxle Cooling Fans



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