Lull 944E-42 Service Manual - Manual (Page 192)

Electrical System
9-34 944E-42
9.11.16 Stabilizer Brake Switch
The stabilizer brake switch (2) works in conjunction with
the Stabil-Trak system. With the boom above 40° and the
service brake depressed, the Stabil-Trak system
engages. If the Stabilizer Brake Switch is suspect in the
proper operation of the Stabil-Trak system, refer to
Section 10.4, “Stabil-TRAK™ System
Test.”.
a. Stabilizer Brake Switch 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.
5. Label and disconnect the electrical connectors
attached to the stabilizer brake switch.
When Service Brake Valve Mounting Plate Does Not
Have Threaded Mounting Hole
Remove switch dust cover (3) and bottom locknut (4).
Remove switch body with top locknut still attached (5),
from the mounting plate.
When Service Brake Valve Mounting Plate Has
Threaded Mounting Hole
Remove switch dust cover (6). Remove the switch by
loosening the locknut (7) and unscrewing the switch (8)
from the mounting plate.
b. Stabilizer Brake Switch Installation
When Service Brake Valve Mounting Plate Does Not
Have Threaded Mounting Hole
1. Thread the top locknut (9) onto the shaft of the
switch. Leave enough threads at the bottom of the
shaft for the thickness of the plate and second
locknut.
2. Insert switch body through the top of the service
brake switch bracket. There should be approximately
5 threads on the switch shaft beyond the mounting
plate.
3. Thread the bottom locknut (10) onto the switch body
until finger tight against the service brake valve
mounting plate.
4. Use a wrench and fully tighten the top locknut
against the service brake valve mounting plate.
MU6970
6
2
2
3
4
5
7
8
MU6980
9
10
11