JLG G12-55A Service Manual - Manual (Page 78)

Cab and Covers
4-8 G10-55A, G12-55A
Note: When the engine is initially started, run it briefly at
low idle and check the machine for any visual sign of
fluid leakage. STOP the engine immediately if any
leakage is noted, and make any necessary repairs
before continuing.
10. Wait for the engine to cool and check the coolant
level. Add coolant as required to bring the coolant to
the proper level.
11. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
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 cab, its welds and mounts. If modification,
damage, a cracked weld and/or fatigued metal is
discovered, replace cab. Contact local distributor with
any questions about 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 machine on a firm, level surface. Allow
sufficient overhead and side clearance for cab
removal. Level machine, fully retract boom, lower
boom, place transmission control lever in (N)
NEUTRAL position, engage park brake and shut
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 engine cover. Allow the system fluids to cool.
4. Properly disconnect the batteries.
5. If equipped with cab heater:
• Place a funnel at base of radiator to channel
drained coolant into container. Loosen drain
petcock and allow coolant to drain.
• Transfer the coolant to a container with a cover,
and label as “Used Antifreeze.” Dispose of the
used coolant at an approved recycling facility.
• Tighten the radiator drain petcock.
• Disconnect cab heater hoses. Refer to Section
4.3.7, “Heater/Air Conditioning System (if
equipped).”
6. Remove necessary dash panels to gain access to
electrical wiring connections. Label and disconnect
harnesses. Push harness connectors through
opening in the cab.
7. Remove boom joystick from is mounting position.
Refer to Section 4.3.4, “Boom and Tilt 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.
8. Remove frame level and attachment tilt and auxiliary
control joystick. Refer to Section 4.3.5, “Frame Level,
Auxiliary and Outrigger Control Joysticks.” Label,
disconnect and cap all hydraulic hoses attached to
joystick. Cap all fittings and openings to keep dirt
and debris from entering hydraulic system.
9. 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.
10. 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.
11. 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.
12. Push all hydraulic hoses through opening in cab.
13. Disconnect the throttle cable from the throttle
assembly. Refer to Section 4.3.3, “Throttle Pedal.”
14. Disconnect engine air filter and hydraulic oil
reservoir breather from their brackets at top of cab.
Move air filter and breather clear from cab so they do
not become damaged during cab removal.
15. 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.