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Maintenance
Note: Do Not change hydraulic system oil (except
for what can be drained when changing lter), unless
it is felt the oil has been contaminated or been
extremely hot.
Changing oil unnecessarily could damage hydraulic
system by introducing contaminates into the system.
Hydraulic System Air Purge
Service Interval: As required
Air must be purged from the hydraulic system
when any hydraulic components, including oil
lter, 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 (
Figure 21). Air in other parts of
the hydraulic system will be purged through normal
operation once the charge pump is “primed”.
Figure 21
1. Charge pump cap 2. Loosen 1 1/2 turns only
1. Stop engine and wait for all moving parts to stop.
Raise the rear of the machine up onto jack stands
high enough to raise the drive wheels off the
ground.
2. Check oil level as stated in Check Hydraulic Oil
Level section.
3. Start engine and move throttle control ahead to
full throttle position. Move RH motion control
lever inward (together) and move both levers
forward with equal pressure.
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 position.
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
with step
4.
4. Thoroughly clean the area around each of the
charge pump housings.
5. To “prime” charge pump, loosen two hex socket
head capscrews (shown in Figure 21) 1 1/2 turns
only. Make sure engine is not running. Lift
the charge pump housing upward and wait for
a steady ow of oil to ow out from under the
housing. Retighten the capscrews. Do this for
both pumps.
Note: Hydraulic reservoir can be pressurized up
to 5 psi to speed this process.
6. If either drive wheel still does not rotate, stop
and repeat steps 4 and 5 above for the respective
pump. If wheels rotate slowly, the system may
prime after additional running. Check oil level
as stated in Check the Hydraulic Oil Level
section.
7. Allow unit to run several minutes after the charge
pumps are “primed” with drive system in the full
speed position. Check oil level as stated in Check
the Hydraulic Oil Level section.
8. Check hydro drive linkage adjustment as stated in
Hydro Drive Linkage Adjustment section in
Adjustments.
Wheel Hub Nut Torque
Specication
Service Interval: After the rst 100 hours
Every 500 hours thereafter
Torque the nut on the wheel motor tapered shaft to
175-225 ft-lb (237-305 N-m).
Note: Do Not use anti-seize compound on the
wheel hub.
Check Spark Arrester
(if equipped)
Service Interval: Every 50 hours
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