HYDRAULIC SYSTEM GRT9165 SERVICE MANUAL
2-14
Published 10-01-2020 Control # 699-00
HYDRAULIC PUMPS
NOTE: Refer to Figure 2-4 for pump locations.
Pumps No. 1, 2, and 3 are mounted on drive pads of the
torque converter. Pump No. 4 is mounted on a drive pad of
the engine.
The purpose of these pumps is to convert mechanical
energy into fluid energy for the operation of the crane’s
hydraulic components.
For specifications of each pump, see List Of Specifications,
page 1-3.
Maintenance
Pump No. 1 Removal
1. Remove hardware as needed to gain access to the
pump. The pump is bolted to the engine’s torque
converter.
2. Tag and disconnect the supply line from the pump. Cap
or plug the line and port.
3. Tag and disconnect the pump distribution lines from the
pump. Cap or plug the lines and ports.
4. Remove the capscrews, washers, spacer, and gaskets
attaching the pump to the drive pad on the torque
converter. Remove the pump.
5. Clean the gasket material from the drive pad of the
torque converter and from the pump.
6. Cover the drive pad’s opening to prevent dirt from
entering.
Pump No. 1 Installation
1. Clean the pump and the torque converter drive pad with
Loctite® cleaning solvent 7070 or similar non-
chlorinated solvent.
2. Apply gasket material Loctite® Master Gasket 518 to
pump and drive pad mounting surfaces. (This material
partially cures in 4 hours and fully cures in 48 hours.)
3. Apply Loctite® 243 to the threads of the capscrews.
Install pump, spacer, and gaskets on drive pad with
capscrews and washers. Make sure the splines mesh
properly.
4. Torque capscrews to recommended torque.
5. Connect the distribution and supply lines to the pump as
tagged during removal. On lines that use them, discard
any old O-ring and install a new O-ring in its place.
CAUTION
Absolute cleanliness is essential when working on the
hydraulic pumps. The presence of dirt and foreign
materials in the system can result in serious damage or
inadequate operation.
CAUTION
Keep the pump as level as possible to avoid damaging
the input spline.
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