11 boom angle sensor, Boom angle sensor – Lull 944E-42 Service Manual User Manual

Page 188

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Electrical System

9-30

944E-42

c. Single Joystick Function Solenoid Valves

The single joystick commands are actuated, both
electrically and hydraulically, via a set of solenoid
operated cartridges within the single joystick pilot select
valve. The single joystick pilot select valve is located on
the valve plate which is located under the cab floor.

d. Solenoid Coil and Cartridge Valve Replacement

If a solenoid coil (14 through 19) is suspected of
malfunctioning, label and disconnect the wire harness
connector (20) at the coil and test the coil for proper
resistance. Solenoids (14) through (17) should have a
resistance reading of 8.6 ohms. Proportional solenoids
(18) and (19) 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.

9.11.11

Boom Angle Sensor

The boom angle sensor (21) is located at the rear of, and
on the right side of the outer boom. When the boom is
lifted above 40°, the boom sensor sends a signal to one
of the Stabil-Trak indicators on the instrument cluster.

Note: The boom sensor has a yellow L.E.D. (22) that is
illuminated when the boom is below 40°.

a. Boom Angle Sensor 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.

Single Joystick Pilot Select Valve Solenoids

Function

Abbreviation on Valve

Transfer Carriage (14)

TR

Auxiliary Hydraulics (15)

AX

Extend/Retract (16)

EXT

Lift/Lower (17)

HO

Attachment Tilt Down (18)

CTB

Attachment Tilt Up (19)

CTA

MU6351

15

14

FRONT

17

16

19

18

20

MU4471

22

21

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