SERVICE
Service - 48
Changing the Rear Transaxle Differential
Oil
1.
Remove the rear weights from the hitch bar (if
equipped).
2.
Place a drain pan (minimum 5.5 liter / 6 quart)
under the rear transaxle.
3.
B
Remove the
C
drain plug (B)
from the rear
transaxle and
allow the hydraulic
oil to drain. Re-
move the oil fill
plug (C) from the
rear transaxle to
allow venting.
NOTE: on some
power units, it may be necessary to remove the
rear transaxle skid plate to access the drain plug.
4. Reinstall the plug into the rear transaxle and
torque to 34-39 Nm (25-29 ft-lbs).
5.
Add HydroTorq XL synthetic hydraulic oil (approxi
-
mately 3.8 liters / 4 quarts) to the fill port in the
rear transaxle until the oil is level with the bottom
of the oil fill hole.
6. Reinstall the plug into the rear transaxle and
torque to 34-39 Nm (25-29 ft-lbs).
7. Clean up any spilled oil and dispose of oil in accor-
dance with local laws.
ATTENTION
Oil is hazardous to the environment. Drain oil into
an approved container and dispose of used oil in
accordance with local laws.
8. If the rear transaxle skid plate was removed to ac-
cess the drain plug, reinstall the skid plate.
9.
Reinstall the rear weights (if equipped).
Servicing the Closed Loop Hydrostatic
Drive Circuit
ATTENTION
Service or repair of the closed loop drive circuit
must be performed by an authorized Ventrac dealer.
If any part of the closed loop hydrostatic drive
circuit (the pump, the front drive motor, the rear
drive motor, or any of the three 1/2” hydraulic lines
connecting them together) is serviced or replaced,
the Ventrac closed loop drive circuit filtration pro
-
cedure must be performed. The procedure requires
a special Ventrac remote filtering tool and must be
performed by a Ventrac authorized technician.
Servicing the Hydraulic Cooler
1. Brush dirt and debris from the oil cooler screen in
the right fender.
2. Remove the control panel from the top of the right
fender.
3. Remove any accumulated debris from inside the
fender area.
4.
Blow the dust out of the cooler fins from inside the
fender area using low pressure air.
5. Reinstall the control panel.
Checking the Engine RPM
Check the engine RPM when the engine is warm and
not under load. Observe the tachometer:
•
Low idle speed = 1,550 ±50 RPM
•
High idle speed = 3,600 ±50 RPM
If engine RPM is incorrect, contact your Ventrac dealer.
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