Lull 944E-42 Service Manual - Manual (Page 743)

9.233 Model 644E-42/944E-42 Rev. 6/04
Electrical System
e. Solenoid Coil and Cartridge Valve Replacement
If a solenoid coil (15 through 20) is suspected of
malfunctioning, label and disconnect the wire harness
connector (21) at the coil and test the coil for proper
resistance. Solenoids 15 through 18 should have a
resistance reading of 8.6 ohms. Proportional solenoids
19 and 20 should have a resistance reading of 7.2 ohms.
Replace solenoid if open or shorted to ground. Also
inspect the valve cartridges, o-rings, and the other
hydraulic and electrical components in the circuit to
accurately determine the cause of the problem.
If testing more than one coil, insure that the wire harness
connectors are correctly re-connected.
9.14.12 Boom Sensor (Proximity Switch)
The boom lift sensor (22) is located at the rear of, and on
the right side of the outer boom (23). When the boom is
lifted above 40°, the boom sensor sends a signal to one
of the Stabil-TRAK indicators on the dash panel.
Note: The boom sensor has a yellow L.E.D. (24) that is
illuminated when the boom is below 40°.
a. Boom Sensor Replacement and Adjustment
Boom Sensor Removal
1. Unlock and open the engine cover (26).
Single Joystick Pilot Select Valve Solenoids
Function Abbreviation on Valve
Transfer Carriage (15) TR
Auxiliary Hydraulics (16) AX
Extend/Retract (17) EXT
Lift/Lower (18) HO
Attachment Tilt Down (19) CTB
Attachment Tilt Up (20) CTA
MU6350
Front
14
15
16
17
18
19
20
21
21
MU4470
22
23
24
25
4110390
1.
2.
OU0780
26