Changing Hydrostatic Transmission Fluid; Cleaning; Engine Air Cleaner System; Donaldson Radialseal™ Air Cleaner - Walker MS (13 HP) Owner's Manual

Maintenance Instructions

Changing Hydrostatic Transmission Fluid

The hydrostatic fluid should be changed every 1000
hours or two (2) years. Also, the fluid should be
changed if the natural color of the fluid has become
black or milky (indicating possible overheating
or water contamination of fluid). The transmission
may be refilled using any of the fluids listed in
Specifications. The fluid is changed as follows:
1. Park the mower on a level surface and stop the
engine.
2. Remove the lower drain plug and the air bleed
plug. Allow the fluid to drain out.
IMPORTANT: Clean any dirt from around the
plugs and reservoir cap before removing them.
3. Reinstall the lower drain plug, making sure the
rubber O-ring on the plug is in place and in good
condition.
4. Refill the transmission through the air bleed plug
hole until it is as full as possible.
IMPORTANT: Avoid fluid contamination when
filling the transmission. Use clean container,
spout, funnel, etc. when pouring the fluid into the
air bleed opening and reservoir.
5. Rotate the transmission input shaft about five (5)
revolutions to allow any trapped air to escape.
6. Before installing the air bleed plug, fill the reser-
voir with fluid allowing a small amount to leak out
of the air bleed plug hole.
7. Install the air bleed plug and fill the reservoir to
the COLD level line.
48
LUBRICATION/CLEANING

CLEANING

Engine Air Cleaner System

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, eliminating
the possibility of dust leaks due to improper filter instal-
lation. Intake design, internal baffling, and a
Vacuator™ valve provide dust separation and auto-
matic 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 Donaldson air filter ele-
ments for replacement (Donaldson P822686 or
Walker 5090-1). Aftermarket filters may not seal
properly or filter efficiently.
Canister
Radialseal™
Filter Element
Air Cleaner Components
(shown with cover being removed)
IMPORTANT: The Donaldson air cleaner uses a dry
paper-type air filter element. NEVER apply oil to the
paper element.
Cover
Cover Latch
Vacuator™
Valve