JLG G12-55A AccuPlace Service Manual - Manual (Page 87)

7.9 G10-55A & G12-55A AccuPlace
Engine
7.6 AIR CLEANER ASSEMBLY
Note: Refer to the appropriate Operation & Safety
Manual for your machine for the correct element change
procedure.
7.6.1 Air Cleaner Assembly 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 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. Remove the battery negative (-) cable from the
battery negative (-) terminal.
5. Remove the clamp securing the air intake elbow to
the air cleaner assembly. Lift the air intake elbow off
the air cleaner.
6. Remove the capscrews and nuts securing the air
cleaner mounting bracket to the air cleaner mounting
plate. Remove the air cleaner assembly.
7.6.2 Air Cleaner Assembly Installation
Note: Apply Loctite ® 242 threadlock to the capscrew
threads before installation.
1. With the air cleaner assembly attached, install the air
cleaner mounting bracket using capscrews and nuts.
2. Place the loosened clamps over the air outlet elbow
and install elbow on the air cleaner assembly.
3. Adjust and tighten both clamps to 30 lb-in (3 Nm)
before starting the machine.
4. Connect the battery negative (-) cable to the battery
negative (-) terminal.
5. Close and secure the engine cover.
7.7 ENGINE REPLACEMENT
7.7.1 Engine Removal
Note: The radiator and oil cooler must be removed from
the machine before engine removal. Refer to
Section
7.2, “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. Disconnect the (+) positive and (-) negative battery
cables and remove the battery.
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 7.2.3, “Radiator 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.
CAUTION
NEVER run the engine with only the inner safety
element installed.