Changing Hydrostatic Transmission Fluid - Model Ms, Mc, Md, Mt - Walker MT Detailed Instructions

3. If the fluid is below the COLD mark (or the trans-
mission is not performing properly), loosen the air
bleed plug (located on the top of transmission
case next to the plastic reservoir).
a. If a small amount of fluid leaks from around
the air bleed plug:
* The transmission is full of fluid.
* Tighten the plug and fill the reservoir to the
COLD level mark.
b. If no fluid leaks from around the air bleed plug:
* Slowly add fluid into the reservoir until fluid
starts to leak from around the plug.
(Transmissions are serviced from the fac-
tory with Mobil 1 (15W50) Synthetic Oil).
When it is necessary to add fluid, refer to
Specifications for the proper fluid.
* As soon as there is fluid leaking from
around the air bleed plug, tighten the plug
and fill the reservoir to the COLD level
mark. Wipe any excess oil off of the trans-
mission housing.
IMPORTANT: DO NOT overfill the transmission res-
ervoir. This will result in oil leaking out of the reservoir
cap vent when the transmission warms up. It is prefer-
able to add fluid to the transmission when it is cold and
make sure the oil is not above or below the COLD
level mark.
IMPORTANT: The transmission reservoir has a fine
mesh screen in the bottom to trap dirt and foreign par-
ticles from entering the transmission. When filling the
reservoir, fluid will flow quite slowly through this
screen; so it is essential that there is fluid at the bleed
plug before the transmission is considered full.
IMPORTANT: Any attempt to remove or in any way al-
ter the filtering screen in the transmission reservoir
could cause damage to the transmission and will VOID
any transmission warranty.
SERVICE INSTRUCTIONS
July 2006
Changing Hydrostatic Transmission Fluid - Model MS,
MC, MD, MT
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 is re-
filled using the factory service fluid noted in TRANS-
MISSION Specifications.
follows:
1.
2.
3.
4.
5.
6.
7.
WALKER MANUFACTURING COMPANY
Page: 2-14
The fluid is changed as
Park the mower on a level surface and stop the
engine.
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.
Reinstall the lower drain plug, making sure the rub-
ber O-ring on the plug is in place and in good con-
dition.
Refill the transmission through the air bleed plug
hole until it is as full as possible.
IMPORTANT: Avoid fluid contamination when
filling the reservoir. Use clean container, spout,
funnel, etc. when pouring the fluid into the reservoir.
Rotate the transmission input shaft about five (5)
revolutions to allow any trapped air to escape.
Before installing the air bleed plug, fill the reservoir
with fluid allowing a small amount to leak out of the
air bleed plug hole.
Install the air bleed plug and fill the reservoir to the
COLD level line.