Exmark Viking Hydro 920000 - Manual (Page 26)

Maintenance
Figure 8
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 the speed control
lever to the middle speed position and place the
drive levers in 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 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 8) 1 1/2 turns
only. Make sure engine is not running. Lift
the charge pump housing upward and wait for
a steady flow of oil to flow 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.
Replace Emissions Air Intake
Filter
Service Interval: Every 500 hours
1. Stop engine, wait for all moving parts to stop, and
remove key or spark plug wire(s). Engage parking
brake.
2. Remove the filter from the vent hose.
3. Insert a new filter into the end of the vent hose.
Wheel Hub-Slotted Nut
Torque Specification
Service Interval: After the first 100 hours
Every 500 hours thereafter
See Figure 9 to determine which slotted nut has been
installed on the unit.
Figure 9
1. Style A (black finish) 3. Style B (yellow zinc)
2. .03 inch (.76 mm) 4. .24 inch (6 mm)
• Style A (black finish):
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