Operation and maintenance manual

Section 230-0050
SM 1394 Rev1 12-04
5
Body System - Main Hydraulic Pump
3. Remove cap from the inlet line and install a new
'O' ring in the split flange fitting. Secure inlet line to
inlet port 'A' on the pump with bolts and lockwashers,
as removed during removal.
4. Before connecting the outlet line to outlet port 'B' on the
pump, fill the pump with hydraulic oil as specified in
Section 300-0020, LUBRICATION SYSTEM.
5. Remove cap from the outlet line and install a new
'O' ring in the split flange fitting. Secure outlet line to
outlet port 'B' on the pump with bolts and lockwashers,
as removed during removal.
Note: It is very important that the pump cavity is filled
with hydraulic oil. This will ensure proper lubrication of
the internal parts of the pump when it is initially
operated.
6. Fill hydraulic oil tank with hydraulic oil as specified
in Section 300-0020, LUBRICATION SYSTEM. Install
filler cap on hydraulic tank filler neck.
START-UP PROCEDURE
Before starting the engine and running the pump,
back-off the system relief valve on the body control
valve, until the adjusting screw spring tension is
relieved. Refer to Section 230-0060, BODY
CONTROL VALVE, for details. This avoids the
possibility of immediate damage to the pump if the
relief valve pressure setting had been increased,
beyond the recommended operating pressure, before
removal of the pump. Loosen the bolts at flange fitting
on outlet line at port 'B' on the pump to allow
entrapped air to bleed out at initial start-up.
Note: Always install steering lock bar when working in
the articulation area.
Place the battery master switch in the 'On' position and
the steering lock bar in the 'Locked' position. Start the
engine and run the pump at idle for two or three
minutes and with no pressure. When oil runs out of
pump outlet port 'B' in a steady stream, tighten outlet
line flange fittings. During the break-in period, the
pump should run free and not develop an excessive
amount of heat. If the pump becomes hot to touch, it is
binding and might seize. In this instance the pump will
have to be rebuilt with extra care to prevent binding.
If the pump is running properly, engine speed and
hydraulic system pressures can gradually be
increased to normal operating values. Adjust the
system relief valve to the proper setting as described
INSTALLATION
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
WARNING
To prevent personal injury and property
damage, be sure lifting equipment is properly
secured and of adequate capacity to do the job
safely.
1. Coat pump driveshaft with molybdenum disulphide
grease and install gasket (20) on mounting face of the
pump assembly.
2. Support pump assembly with suitable lifting
equipment and position on the transmission housing.
Secure pump assembly to transmission housing with
bolts (4) and lockwashers (5), as removed during
removal.
Fig. 7 - Installing Front Cover
Fig. 6 - Installing Driveshaft and Gear in Body Housing
SM - 1868
SM - 1869