Lull 944E-42 Service Manual - Manual (Page 725)

9.215 Model 644E-42/944E-42 Rev. 6/04
Electrical System
3. Label and disconnect the hydraulic oil filter pressure
switch leads (3) from the harness connectors.
4. Remove the hydraulic oil filter pressure switch (1)
from the hydraulic oil filter.
b. Disassembly
DO NOT disassemble the hydraulic oil filter pressure
switch. Replace a defective or faulty switch with a new
part.
c. Cleaning and Drying
DO NOT submerge the hydraulic oil filter pressure switch.
Clean only with an approved solvent and dry with a clean,
lint-free cloth.
d. Inspection and Replacement
Inspect switch wiring for continuity and shorting. Replace
a defective or faulty switch with a new part.
e. Installation and Testing
1. Apply clean hydraulic oil to the threads (4) on the
hydraulic oil filter pressure switch (1). Thread the
switch into the top of the hydraulic oil filter. Torque
switch to 25 - 40 lb-ft (34 - 54 Nm).
2. Connect the hydraulic oil filter pressure switch
leads (3) to the harness connectors.
3. If the vehicle has dual batteries, connect both
negative battery cables (7 and 8) to both batteries.
Connect the lower negative battery cable (7) to the
negative (-) terminal on the lower battery (9). Swing
the upper battery box (12) in and make sure that the
lip (11) on the upper battery box slides below the
knob (10). Secure in place with the knob.
4. Lower and lock engine cover. To release and lower
the engine cover (5) from the fully raised position, lift
up slightly on the cover and push the upper part of
the right gas shock (6) (orange tab) to the left. Line
up the upper part of the shock lock tube with the
lower part of the gas shock and pull the cover down
to the closed position.
5. Clear the area around the vehicle of personnel and
any obstructions to vehicle travel.
6. Start the engine, check for hydraulic fluid leaking at
the hydraulic oil filter pressure switch, and allow the
hydraulic fluid to reach operating temperature.
7. Cycle the boom several times and check whether the
hydraulic oil filter restriction indicator illuminates on
the front dash panel.