JLG G12-55A AccuPlace Service Manual - Manual (Page 83)

7.5 G10-55A & G12-55A AccuPlace
Engine
b. Thermostat Installation
1. Install the engine thermostat, thermostat gasket and
thermostat housing. Secure with the two capscrews.
2. Connect the Engine Water Temperature sender.
3. Connect the battery negative (-) cable to the battery
negative (-) terminal.
4. Open the radiator cap, and fill the radiator
completely with a 50/50 mixture of ethylene glycol
and water. Replace and tighten the radiator cap. Add
coolant to the overflow bottle until the bottle is 1/4 to
1/2 full. This overfilling will compensate for any air
trapped in the cooling system.
5. Run the engine to operating temperature. Visually
check for leaks with the engine running. Check the
coolant level in the overflow bottle and fill, or drain,
as necessary.
7.2.3 Radiator Replacement
Before considering radiator replacement for other than
obvious damage, conduct a cooling system pressure test,
check the coolant specific gravity, coolant level, fan belt
tension and dash panel temperature indicator.
• 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. Radiator 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 suitable container beneath the radiator
drain.
7. Place a funnel at the base of the radiator to channel
the drained coolant into a container. Loosen the
drain cock 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. Tighten the radiator drain cock.
8. Label, disconnect and cap the hose attached to the
coolant recovery tank. Remove the coolant recovery
tank.
9. Loosen the clamps on the hoses attached to the
radiator. Work the hoses off the radiator. Position the
hoses out of the way to allow radiator removal, or
remove the hoses from the engine. Inspect the
hoses, and replace if necessary.
10. Loosen the clamps on the hoses attached to the oil
cooler. Work the hoses off the oil cooler. Position the
hoses out of the way to allow radiator removal, or
remove the hoses from the engine. Inspect the
hoses, and replace if necessary.
11. Remove the radiator fan shroud.
12. Remove the nuts and washers from the radiator and
oil cooler mounts.
13. Carefully lift the radiator and oil cooler out of the
engine compartment.
Note: If more clearance is needed to remove the
radiator, the engine fan may be removed for easier
access.
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MY1040