3 dual hydraulic oil temperature switch, Dual hydraulic oil temperature switch – Lull 944E-42 Service Manual User 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.