Page 23
45-J Desel - Servce & Parts Manual
January 2022
Secton 10 - Hydraulc System
Hydraulic Pumps
Note:
Refer to Section 25 - Hydraulics.
An internal combustion engine drives the Drive and Functions Pumps.
The Drive Pump is a variable displacement axial piston pump that provides hydraulic power to the
Drive Motors. This is a hydrostatic drive system.
The Functions Pump is a variable displacement pump that provides hydraulic power to the Functions
Manifold.
Remove
Disconnect the battery.
Place a large container under the engine
and pumps to catch fluid that will be lost
during pump replacement. Dispose of
used fluid properly.
Close the ball valve(s) on the Hydraulic
Tank to prevent fluid loss when the hoses
are removed.
Tag and disconnect hydraulic hoses, and
IMMEDIATELY cap or cover the openings
to prevent contamination.
Remove the bolts that secure the
Functions Pump. Remove the pump.
Remove the bolts that hold the Drive
Pump to the engine. Remove the pump.
Installation is reverse of removal. Apply
one (1) drop of Loctite® 242 or equivalent
to each mounting bolt.
Open the ball valves on the Hydraulic
Tank.
Loosen the output hose fittings at the
hydraulic pumps to flood with hydraulic
fluid. Tighten fittings.
1.
2.
3.
4.
5.
6.
7.
8.
9.
DRIVE
PUMP
FUNCTION
PUMP
Art 5509
Failure to open the ball valves on the Hydraulic Tank will result in
damage to the pumps������
DO NOT operate the hydraulic pump until you have filled them with fluid
and bled all air out of them������ Severe damage will occur������
