JLG G12-55A Service Manual - Manual (Page 74)

Cab and Covers
4-8 G10-55A, G12-55A
4.4 CAB REMOVAL
Note: To help ensure safety and optimum performance,
replace the cab if it is damaged. Refer to the appropriate
parts manual for ordering information.
Inspect the cab, its welds and mounts. If modification,
damage, a cracked weld and/or fatigued metal is
discovered, replace the cab. Contact the local distributor
with any questions about the suitability or condition of a
cab.
Note: Remove and label cab components as needed
before removing the cab from the machine. Label,
disconnect and cap hydraulic hoses. Transfer cab parts
to the replacement cab after the replacement cab is
securely mounted on the machine.
1. Park the machine on a firm, level surface. Allow
sufficient overhead and side clearance for cab
removal. Level the machine, fully retract the boom,
lower the boom, place the travel select lever in the
(N) NEUTRAL position, engage the park brake and
shut the engine OFF.
2. Block all four wheels to help prevent the machine
from moving. Assure that there is sufficient overhead
and side clearance for cab removal.
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect the battery.
5. Place a funnel at the base of the radiator to channel
the drained coolant into the container. Loosen the
drain petcock and allow the coolant to drain.
6. Transfer the coolant to a container with a cover, and
label as “Used Antifreeze.” Dispose of the used
coolant at an approved recycling facility.
7. Tighten the radiator drain petcock.
8. Disconnect the cab heater hoses. Refer to Section
4.3.7, “Heater/Air Conditioning System (if
equipped).”
9. Remove the necessary dash panels to gain access
to the electrical wiring connections. Label and
disconnect the harnesses. Push the harness
connectors through the opening in the cab.
10. Remove the boom joystick from is mounting
position. Refer to Section 4.3.4, “Boom Joystick
Assembly.” Label, disconnect and cap all hydraulic
hoses attached to the boom joystick. Cap all fittings
and openings to keep dirt and debris from entering
the hydraulic system.
11. Remove the frame level and attachment tilt and
auxiliary control joystick. Refer to Section 4.3.5,
“Frame Sway, Auxiliary and Outrigger Control
Joysticks.” Label, disconnect and cap all hydraulic
hoses attached to the joystick. Cap all fittings and
openings to keep dirt and debris from entering the
hydraulic system.
12. Label, disconnect and cap all hydraulic hoses
attached to the steering orbitrol valve. Cap all fittings
and openings to keep dirt and debris from entering
the hydraulic system.
13. Label, disconnect and cap all hydraulic hoses
attached to the steering orbitrol valve. Cap all fittings
and openings to keep dirt and debris from entering
the hydraulic system.
14. Label, disconnect and cap all hydraulic hoses
attached to the service brake valve. Cap all fittings
and openings to keep dirt and debris from entering
the hydraulic system.
15. Push all the hydraulic hoses through the opening in
the cab.
16. Disconnect the throttle cable from the throttle
assembly. Refer to Section 4.3.3, “Throttle Pedal.”
17. Disconnect the engine air filter and hydraulic oil
reservoir breather from their brackets at the top of
the cab. Move the air filter and breather clear from
the cab so they do not become damaged during cab
removal.
18. Remove the fuel tank from the cab. Refer to Section
7.6.2, “Fuel Tank.”
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.