JLG G12-55A Service Manual - Manual (Page 112)

Engine
7-14 G10-55A, G12-55A
2. Place a Do Not Operate Tag on both the ignition key
switch and 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.
5. Loosen the clamp (15) securing the air intake elbow
(16) engine.
6. Loosen the capscrews securing the air cleaner
mounting bracket (17) to the engine fire wall.
7. Remove the air cleaner assembly (17 & 18).
8. Remove the air cleaner mounting bracket (17) from
the air cleaner (18).
7.8.4 Air Cleaner Assembly Installation
(Cummins)
Note: Apply Loctite
®
242 to the capscrew threads
before installation.
1. Install the air cleaner (18) to the air cleaner mounting
bracket (17).
2. Install the air cleaner assembly (17 & 18) to the
engine fire wall.
3. Tighten the previously loosened capscrews.
4. Install the air intake elbow (16) onto the engine.
5. Adjust and tighten the clamp (15).
6. Properly connect the battery.
7. Close and secure the engine cover.
8. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.
7.9 ENGINE REPLACEMENT
7.9.1 Engine Removal
Note: The radiator and oil cooler must be removed from
the machine before engine removal. Refer to
Section
7.4, “Engine Cooling System.” Several additional
components must be removed before engine removal.
They will be addressed in the following procedures.
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 shut the
engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and steering wheel, stating that the machine
should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Properly disconnect and remove the battery.
Properly disconnect and remove the second battery
if equipped.
5. Remove the engine cover. Mark the position of the
cover to help with cover adjustment when being
reinstalled.
6. Remove the oil pan cover underneath the engine
compartment.
7. Drain and remove the radiator assembly. Refer to
Section 7.4.3, “Radiator/Oil Cooler and
Replacement.”
8. Remove the heater hoses attached to the engine (if
equipped).
Note: The engine harness is routed and attached to the
engine using hold-down clamps and plastic wire ties at
various places on the engine. Before removing engine,
ensure that the harness has been completely separated
(disconnected) from the engine. Move the harness clear
of the engine, and with the help of an observer, ensure
that the engine clears the harness during removal.
9. Label and disconnect all electrical wire connections
on the engine.
10. Label and disconnect all electrical wire connections
on the Power Distribution bracket.
11. Remove the Power Distribution bracket.
12. Disconnect and cap the fuel inlet line at the fuel filter
head.
13. Disconnect and cap the fuel return line from the fuel
filter head.
MY5070
18
16 15
17