Toro 30986 Operator's Manual page 43

4. Locate filter under engine base and place drain pan
under filter (Figure 55).
5. Remove the old filter and wipe the filter adapter
gasket surface clean (Figure 55).
1. Hydraulic filter
2. Gasket
6. Apply a thin coat hydro fluid to the rubber gasket
on the replacement filter.
7. Install replacement hydraulic filter onto the filter
adapter. Do not tighten.
8. Remove plastic bag from reservoir opening and
allow filter to fill with hydraulic fluid.
9. When the hydraulic filter is full, turn the oil filter
clockwise until the rubber gasket contacts the filter
adapter, then tighten the filter an additional 1/2 turn
(Figure 55).
10. Clean up any spilled fluid.
11. If there is no fluid, add Mobil 1 15W-50 synthetic
motor oil or equivalent synthetic oil to approximately
1/4 inch (6 mm) below the top of reservoir baffle.
Important: Use oil specified or equivalent.
Other fluids could cause system damage.
12. Start engine and let run for about two minutes to
purge air from the system. Stop the engine and
check for leaks. If one or both wheels will not drive,
refer to Bleeding Hydraulic System.
13. Recheck 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 fluid is changed or after
work is performed on the system.
Air must be purged from the hydraulic system when any
hydraulic components, including oil filter, are removed
or any of the hydraulic lines are disconnected. The
Figure 55
3. Adapter
critical area for purging air from the hydraulic system is
between the oil reservoir and each charge pump located
on the top of each variable displacement pump. Air
in other parts of the hydraulic system will be purged
through normal operation once the charge pump is
primed.
1. Disengage the PTO and set the parking brake.
2. Stop the engine and wait for all moving parts to stop
before leaving the operating position.
3. Raise the rear of the machine up onto 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
full throttle position. Move the speed control lever
to the middle speed position and place the drive
levers into the drive position.
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.
Note: 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, turn off
engine. The pumps may be damaged if the pump
becomes too hot. If either drive wheel still does not
rotate continue to next step.
1. Charge pump cap
6. Thoroughly clean the area around each of the charge
pump housings.
7. To prime the charge pump, loosen two hex socket
head capscrews (Figure 56) 1-1/2 turns only. Make
sure engine is not running. Lift charge pump housing
upward and wait for a steady flow of oil to flow out
from under housing. Retighten capscrews. Do this
for both pumps.
Note: Hydraulic reservoir can be pressurized to up
to 5 psi to speed this process.
43
Figure 56
2. Socket head screw