JLG G12-55A Service Manual - Manual (Page 69)

4-3 G10-55A, G12-55A
Cab and Covers
4.2 OPERATOR’S CAB
4.2.1 Cab Safety
4.2.2 Serial Number Decal
The cab serial number decal is located on the left side of
the cab, behind the seat. Information specified on the
serial number plate includes the cab model number, the
cab serial number and other data. Write this information
down in a convenient location to use in cab
correspondence.
4.3 CAB COMPONENTS
4.3.1 Steering Column and Orbitrol Valve
a. Orbitrol Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the travel select lever in the (N) NEUTRAL
position, engage the parking brake and turn 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 battery.
Note: It may be necessary to remove the main dash
panel to gain access to the appropriate hydraulic hoses.
Refer to Section 9.11.1, “Analog Gauges.”
5. Label, disconnect and cap the four hoses from the
side of the steering valve (1). Cap the fittings on the
steering valve. Label, disconnect and plug the load
sense hose at the front of the steering valve. Cap the
fitting on the steering valve.
6. Remove the steering wheel (2), disconnect and
remove the travel select lever (3), disconnect the
instrument panel harness connector (4).
7. Remove the steering assembly through the dash
panel opening.
8. Support the steering valve, and remove the four hex-
head capscrews and four lockwashers.
Note: DO NOT disassemble the orbitrol valve. The
orbitrol valve is not serviceable and must be replaced in
its entirety, if defective.
WARNING
DO NOT service the machine without following all
safety precautions as outlined in the “Safety Practices”
section of this manual.
WARNING
The protection offered by this ROPS/FOPS will be
impaired if subjected to any modification or structural
damage, at which time replacement is necessary.
ROPS/FOPS must be properly installed using
fasteners of correct size and grade, and torqued to
their specified value.
WARNING
DO NOT weld, grind, drill, repair or modify the cab in
any way. Any modification or damage to cab structural
components requires cab replacement. Refer to page
2-9 in the Operators & Safety Manual.
To help ensure optimum safety, protection and
performance, replace the cab if it is damaged. Refer to
the appropriate parts manual for ordering information.
MY0121
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