Toro 31914, Operator'S Manual, Page: 36 / 44

and a rubber band to prevent all of the hydraulic
fluid from draining out.
4. Locate the hydraulic filter under the engine base
and place a drain pan under the filter (
Figure 43 ).
g001043
Figure 43
1. Hydraulic filter
3. Adapter
2. Gasket
5. Remove the old filter and wipe the filter-adapter
gasket surface clean (
Figure 43 ).
6. Apply a thin coat of hydraulic fluid to the rubber
gasket on the new filter.
7. Install replacement hydraulic filter onto the filter
adapter. Do not tighten.
8. Remove the plastic bag from the reservoir
opening and allow the filter to fill with hydraulic
fluid.
9. When the hydraulic filter is full, turn the hydraulic
filter clockwise until the rubber gasket contacts
the filter adapter; then, tighten the filter an
additional 1/2 turn (
Figure 43 ).
10. Clean up any spilled fluid.
11. If there is no fluid, add fluid to approximately
6 mm (1/4 inch) below the top of the reservoir
baffle; refer to
Hydraulic-Fluid Specifications
(page 35) .
12. Start the engine and let it run for about 2 minutes
to purge any air from the system. Shut off the
engine and check for leaks. If 1 or both wheels
do not drive, refer to
Bleeding the Hydraulic
System (page 36) .
13. Check the level and add fluid, if required. Do
not overfill.
Bleeding the Hydraulic
System
The traction system is self-bleeding; however, it may
be necessary to bleed the system if you change the
fluid or after work is performed on the system.
Purge the air from the hydraulic system when
any hydraulic components, including the hydraulic
filter, are removed or any of the hydraulic lines are
disconnected. The critical area for purging air from
the hydraulic system is between the fluid reservoir
and each charge pump located on the top of each
variable-displacement pump. Air in other parts of the
hydraulic system purge through normal operation
once the charge pump is primed.
1. Park the machine on a level surface, disengage
the PTO, and engage the parking brake.
2. Shut off the engine, remove the key, and wait
for all moving parts to stop before leaving the
operating position.
3. Raise the rear of the machine up with jack
stands high enough to raise the drive wheels
off the ground.
4. Check the hydraulic-fluid level.
5. Start the engine and move the throttle control
to the F
AST
position. Move the speed-control
lever midway between the F
AST
and S
LOW
positions and place the drive levers into the
D
RIVE
position.
Note:
If either drive wheel does not rotate, it
is possible to assist the purging of the charge
pump by carefully rotating the tire in the forward
direction.
Important:
It is necessary to lightly touch
the charge-pump cap with your hand to
check the pump temperature. If the cap is too
hot to touch, shut off the engine. The pumps
may be damaged if the pump becomes too
hot. If either drive wheel still does not rotate,
continue to the next step.
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