
Hydraulic System
91
B.
To replace a PTO-driven hydraulic pump
, perform the following procedure:
1.
Disengage the pump and turn OFF the engine.
2.
Make sure the parking brake is applied and the vehicle is tagged out for maintenance purposes
(refer to “Locking Out and Tagging Out the Vehicle” on page 21).
3.
Close the shut-off valve (see Figure 7
14).
4.
Disconnect the electric coil on the dump valve (if equipped).
5.
Place a pan under the pump to catch dripping oil and unscrew all hydraulic hoses (4) that are
attached to the pump.
6.
Remove the dump valve (if equipped).
N
OTE
:
The dump valve is usually, but not necessarily, located atop the pump.
N
OTE
:
Always reinstall the dump valve and its components (shims, block assembly) as they were
before uninstallation. Make sure you do not invert them.
7.
Remove the suction block (see Figure 7
7) and save it for the new pump.
Figure 7
-
7 Suction block
8.
Disconnect the drive shaft by removing the 4 bolts that secure the shaft to the PTO.
Some mechanics may rather want to disconnect the drive shaft from the pump.
The choice is up to the mechanics and is based on the type of chassis the vehicle is built on.
Caution!
Before disconnecting the hydraulic hoses from the pump, place a pan under the pump to
catch oil that may drip down from the disconnected lines.
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