JLG G12-55A Service Manual - Manual (Page 73)

4-3 G10-55A, G12-55A
Cab and Covers
4.2 OPERATOR CAB
4.2.1 Cab Safety
DO NOT weld, grind, drill, repair or modify the cab in any
way. Any modification or damage to cab structural
components requires cab replacement.
To help ensure optimum safety, protection and
performance, replace the cab if it is damaged. Refer to
the appropriate parts manual for ordering information.
4.2.2 Serial Number Decal
Cab serial number decal is located on left side of cab,
behind seat. Information specified on serial number plate
includes cab model number, 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 machine on a firm, level surface, level machine,
fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL position, engage
parking brake and turn the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel.
3. Open engine cover. Allow the system fluids to cool.
4. Properly disconnect the batteries.
Note: It may be necessary to remove the main dash
panel to gain access to the appropriate hydraulic hoses.
Refer to Section 9.12.1, “Gauges.”
5. Label, disconnect and cap four hoses from side of
steering valve (1). Cap fittings on steering valve.
Label, disconnect and plug load sense hose at front of
steering valve. Cap fitting on steering valve.
6. Remove the steering wheel (2).
7. Disconnect and remove the transmission
control lever (3).
8. Remove the steering assembly through dash
panel opening.
9. Support the steering valve, and remove the four
hex-head capscrews and four lockwashers (4).
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.
MAL1430
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