Lull 944E-42 Service Manual - Manual (Page 180)

Electrical System
9-22 944E-42
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect the batteries.
5. Label and disconnect the pressure switch wiring
connector from the harness connector.
6. Remove the switch from the hydraulic oil filter.
b. Disassembly
DO NOT disassemble the switch. The switch is not
serviceable. Replace switch if found to be defective.
c. Inspection and Replacement
Inspect switch wiring for continuity and shorting. Replace
a defective or faulty switch with a new part.
d. Installation
1. Thread the switch into its fitting on the hydraulic oil
filter. Tighten securely.
2. Connect the switch wiring connector to the harness
connector.
3. Connect the battery negative (-) cable(s) to the
battery negative (-) terminal(s).
4. Start the engine, check for hydraulic fluid leaking at
the hydraulic oil filter pressure switch and allow the
hydraulic fluid to reach operating temperature. Cycle
the boom several times and check whether the
hydraulic oil filter restriction indicator illuminates on
the operator’s display panel.
5. Close and secure the engine cover.
9.11.3 Dual Hydraulic Oil Temperature
Switch
The hydraulic oil temperature switch (6) is threaded into
a fitting at the lower inside wall of the hydraulic oil
reservoir.
a. Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower 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. Properly disconnect the batteries.
5. Label and disconnect the temperature switch wiring
connector from the harness connector.
6. Remove the switch from the hydraulic oil reservoir.
b. Disassembly
DO NOT disassemble the switch. The switch is not
serviceable. Replace switch if found to be defective.
c. Inspection and Replacement
Inspect switch wiring for continuity and shorting. Replace
a defective or faulty switch with a new part.
d. Installation and Testing
1. Thread the switch into its fitting on the hydraulic oil
filter. Tighten securely.
2. Connect the switch wiring connector to the harness
connector.
3. Properly connect the batteries.
4. Start the engine, check for hydraulic fluid leaking at
the hydraulic oil temperature switch and allow the
hydraulic fluid to reach operating temperature. Cycle
the boom several times and check whether the
hydraulic oil temperature warning indicator
illuminates on the operator’s display panel.
5. Close and secure the engine cover.
MU7390
6