Lull 944E-42 Service Manual - Manual (Page 133)

8-17 944E-42
Hydraulic System
2. Place the pump (2) and a new, oiled o-ring (3) into
position on the transmission. Align the pump shaft
with the internal transmission gear, so that the
machined teeth mesh together.
3. Align the bolt holes with the pump mount holes.
Secure the pump to the transmission with the
previously used hardware. Torque the capscrews (4)
to 69-78 lb-ft (94-106 Nm).
4. Uncap and connect the previously labeled hydraulic
hoses to their appropriate locations.
5. Fill the hydraulic reservoir. Refer to Section 8.5.2,
“Hydraulic Oil Reservoir Filling.”
6. Prime the pump by filling the case drain port with fresh,
filtered hydraulic oil from a clean container before
installing the case drain connector and hose.
7. Check all routing of hoses and tubing for sharp
bends or interference with any rotating members. All
tube and hose clamps must be tight.
8. Start the engine and run at approximately one-third
to one-half throttle for about one minute without
moving the machine or operating any hydraulic
functions.
9. Inspect for leaks and check all fluid levels. The
hydraulic reservoir oil level must be to the middle of
the sight gauge.
c. Pump Test
Refer to Section 8.3.1, “Pressure Checks and
Adjustments.”
8.7 VALVES AND MANIFOLDS
8.7.1 Valve Plate Assembly
The main control valve (5), accumulators (6),
accumulator charge/secondary function valve (7),
auxiliary hydraulic pressure release valve (8) and the pilot
select valve (9) are mounted on the valve plate which is
bolted to the sub plate located under the cab. The sub
plate can be swung down for servicing of components or
removed from the cab mount for valve removal.
Follow the procedure in this section to swing down the
sub plate and valve plate assembly from the machine in
order to service the main control valve (5), accumulators
(6), accumulator charge/secondary function valve (7),
auxiliary hydraulic pressure release valve (8) and the pilot
select valve (9).
a. Sub Plate with Valve Plate Lowering
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, raise the boom, place
the transmission control lever in (N) NEUTRAL,
engage the park brake and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Remove the access plate from the cab floor to gain
access to the hose and tube fittings on the valve
plate which is located under the cab.
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