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9. Check for fuel leaks and make any needed repairs.
Servicing the Hydraulic System
Replacing the Hydraulic Filter
Change the hydraulic filter:
• After the first 8 operating hours.
• After every 200 operating hours.
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.
Important
Do not substitute automotive oil filter or
severe hydraulic system damage may result.
3. Remove hydraulic reservoir cap and temporarily cover
opening with a plastic bag and rubber band to prevent
all hydro fluid from draining out.
4. Locate filter under engine base and place drain pan
under filter (Fig. 46).
5. Remove the old filter and wipe the filter adapter gasket
surface clean (Fig. 46).
1
Figure 46
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 hydro fluid.
3
2
m–1256
3. Adapter
36
9. When fluid overflows filter turn the oil filter clockwise
until the rubber gasket contacts the filter adapter, then
tighten the filter an additional 1/2 turn (Fig. 46).
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
Bleeding Hydraulic System, page 36.
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 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 Hydraulic fluid level.
5. Start engine and move throttle control to 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.
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