JLG 4017 Service Manual - Manual (Page 91)

7.5 4017
Engine: Perkins 1004-40T
b. Thermostat Installation
1. Install the engine thermostat, thermostat gasket and
thermostat housing. Secure with the two capscrews.
Torque to 24 Nm (18 lb-ft).
2. Connect the negative (-) battery cable to the battery
negative (-) terminal.
3. 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.
4. 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.
5. Close and secure the engine cover.
7.4.3 Radiator/Oil Cooler and Replacement
Before considering radiator or oil cooler 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/Oil Cooler Removal
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in NEUTRAL (N), engage
the park brake and shut off the engine.
2. Place an Accident Prevention Tag on both the
ignition key switch and the steering wheel, stating
that the machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool. Draining the cooling system while the engine is
hot can cause cracks in the engine block.
4. Remove the negative (-) battery cable from the
battery negative (-) terminal.
5. Remove engine cover to ease removal of radiator/oil
cooler.
6. Remove the radiator guard cover (3) and the lower
engine protective cover.
7. Disconnect and plug the hoses to the overflow bottle.
Remove the three bolts holding the overflow bottle
bracket and remove the overflow bottle.
8. Slowly turn the radiator cap to the first stop and allow
any pressure to escape. Remove the radiator cap.
9. Place a suitable container beneath the radiator
drain.
10. Place a funnel at the base of the radiator to channel
the drained coolant into the container. Loosen the
drain plug (4) 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.
11. Loosen the radiator clamp on the top radiator hose
(5). Work the hose off the radiator. Position the hose
out of the way to allow radiator removal, or remove
the hose from the engine. Inspect the hose, and
replace if necessary.
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