3 engine serial number, 4 specifications and maintenance information, 2 engine cooling system – JLG G12-55A AccuPlace Service Manual User Manual

Page 82: 1 radiator pressure cap, 2 thermostat replacement, Engine cooling system, To section 7.2.2, “thermostat replacement, Engine serial number, Specifications and maintenance information, Radiator pressure cap

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Engine

7.4

G10-55A & G12-55A AccuPlace

7.1.3

Engine Serial Number

The Perkins 1104D serial number is stamped on top of
the engine. Information contained in the serial number is
required in correspondence with the engine
manufacturer.

7.1.4

Specifications and Maintenance
Information

For engine, coolant and oil specifications, and
maintenance information, refer to Section 2, “General
Information and Specifications.”

Detailed Perkins engine service instructions (covering
disassembly, inspection, internal repair, assembly,
adjustment and troubleshooting information) are
provided in the appropriate Perkins engine service
manual.

7.2

ENGINE COOLING SYSTEM

7.2.1

Radiator Pressure Cap

For a 210° F (99° C) system, use a 13 psi (90 kPa)
radiator cap. An incorrect or malfunctioning cap can
result in the loss of coolant and a hot-running engine.

7.2.2

Thermostat Replacement

Before considering thermostat replacement, check the
coolant level, fan belt tension and instrument cluster
temperature indicator.

• If the engine seems to take a long time to warm

up, the thermostat may be stuck in the open
position and requires replacement.

• If the engine runs hot, check the temperature of

the upper radiator hose.

• If the hose is not hot, the thermostat may be

stuck in the closed position.

• If the engine has overheated, performance may

suffer, indicating other damage including a
leaking cylinder head gasket, cracked cylinder
head or block, and/or other internal engine
damage.

a. Thermostat 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. Slowly turn the radiator cap to the first stop and allow

any pressure to escape. Remove the radiator cap.

6. Place a funnel at the base of the radiator to channel

the drained coolant into the container. Loosen the
drain plug and slowly remove to allow the coolant to
drain. Transfer the coolant into a properly labeled
container. Dispose of properly if coolant needs to be
replaced. Replace the radiator drain plug.

7. Disconnect the Engine Water Temperature Sender.

8. Remove the two capscrews securing the thermostat

housing (1) to the engine.

9. Remove the thermostat housing, old gasket and

thermostat. Clean all gasket surfaces. DO NOT let
any debris into the thermostat opening.

Note: ALWAYS use the correct thermostat and install a
new gasket. NEVER operate the engine without a
thermostat, or engine damage will result.

MY2750

1

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