Lull 944E-42 Service Manual - Manual (Page 766)

Stabil-TRAK™ System
10.8 Model 644E-42/944E-42 Rev. 6/04
10.3.2 Stabil-TRAK™ Solenoid Valves
There are five Stabil-TRAK™ solenoid valves (1, 2, 3,
4 and 5) installed in the Stabil-TRAK™ manifold, attached
to the stabilizer cylinder above the left side of the rear
axle.
If a solenoid valve is suspected of malfunctioning,
disconnect the coil wiring lead and test the coil for proper
resistance (7-9 ohms) and for proper voltage from the
harness (12 VDC). Replace the solenoid coil if open or
shorted to ground.
Also inspect the valve cartridge, o-rings, and the other
hydraulic and electrical components in the circuit to
accurately determine the cause of the problem.
All solenoid coils are identical and can be interchanged
for diagnostic purposes.
Note: DO NOT interchange valves 4A (2), 4B (3),
12A (4) or 12B (5) with valve 3 (1). These valves will fit
into the other locations, but are configured differently
internally and will not operate properly if interchanged.
Cartridge valves 4A (2), 4B (3), 12A (4) and 12B (5) are
identical and can be interchanged for diagnostic
proposes.
IMPORTANT: Make sure the .060 orifices are in place
when installing solenoid valves 4A (2) and 4B (3).
In general, if there is a problem with the Stabil-TRAK™
system beyond common electrical troubles, the involved
electrical and hydraulic circuits should each be checked
and the exact source of the problem diagnosed before
any parts are replaced.
10.3.3 Relay Testing
If after checking the electrical system, a relay is suspect,
test the relay as follows:
1. Park the vehicle on a firm, level surface. Level the
vehicle, ground the attachment, place the travel select
lever in the (N) NEUTRAL DETENT position, engage
the parking brake switch and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition key switch and steering wheel, stating that
the vehicle should not be operated. (Refer to Section
1.5, “Accident Prevention Tag Usage.”)
3. Refer to “Fuse Block Relay Locations” on page 9.22
for information on the location of the Stabil-TRAK™
system relays.
4. Refer to “Testing Relays from the Fuse Block” on
page 9.32 for instructions on testing the suspected
relay.
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