Lull 944E-42 Service Manual - Manual (Page 426)

Hydraulic System
8.174 Model 644E-42/944E-42 Rev. 6/04
h. Pump Installation
1. Place the pump (1) and a new oiled o-ring (2) into
position on the transmission. Align the pump gear
shaft coupling with the internal transmission gear so
that the machined teeth mesh together.
2. Align the bolt holes with the pump mount holes.
Secure the pump to the transmission with four plain
washers (3) and capscrews (4). Torque the
capscrews to 69-78 lb-ft (94-106 Nm).
3. Assemble the front outlet hose (5) onto the front
port. Place a new oiled o-ring (6) into position over
the opening and secure the front outlet hose (5) with
two flange halves (7) and four capscrews (8). Torque
the capscrews to 33-37 lb-ft (45-50 Nm).
4. Assemble the rear outlet hose (9) onto the rear port.
Place a new oiled o-ring (10) into position over the
opening and secure the rear outlet hose (9) with two
flange halves (11) and four capscrews (12). Torque
the capscrews to 33-37 lb-ft (45-50 Nm).
5. Prime the pump by filling the pump inlet opening with
fresh, filtered hydraulic oil from a clean container
before attaching the inlet tube (13).
6. Place a new oiled o-ring (14) into position over the
opening and secure the inlet tube (13) with two
flange halves (15) and four capscrews (16). Torque
the capscrews to 50-90 lb-ft (68-122 Nm).
7. Check all routing of hoses, wiring 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 vehicle 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.
Note: Check for leaks and repair as required before
continuing.
i. Pump Test
Refer to Section 8.7, “Hydraulic System Testing.”
1. Perform a flow meter test on both pumps.
2. Check the load sense at the accumulator charge/
secondary function valve.
3. Check the system functions.
MU1990
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WARNING:
Avoid prolonged engine
operation in closed areas with inadequate
ventilation. Failure to properly ventilate exhaust
fumes can result in death or serious injury.
WARNING:
Hydraulic oil leaking under
pressure can penetrate the skin and cause
severe personal injury. DO NOT use your hand
or any part of your body to check for hydraulic
leaks. When checking for hydraulic leaks, wear
safety glasses and gloves to help provide
protection from spraying hydraulic oil. Use a
piece of cardboard or paper to search for
leaks.
MU1890
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