JLG 4017 Service Manual - Manual (Page 90)

Engine: Perkins 1004-40T
7.4 4017
7.2 ENGINE SERIAL NUMBER
The Perkins 1004-40T serial number Is stamped on a
plate which is secured to the engine block, near the fuel
injector pump. Information contained in the serial number
is required in correspondence with the engine
manufacturer.
7.3 SPECIFICATIONS AND
MAINTENANCE INFORMATION
For engine, coolant and oil specifications, and
maintenance information, refer to Section 2, “General
Information and Specifications.”
Note: Detailed Perkins engine service instructions
(covering disassembly, inspection, internal repair,
assembly, adjustment and troubleshooting information)
are provided in the appropriate Perkins engine service
manual.
7.4 ENGINE COOLING SYSTEM
7.4.1 Radiator Pressure Cap
For a 99° C (210° F) system, use a .9 kPa (13 psi) radiator
cap. An incorrect or malfunctioning cap can result in the
loss of coolant and a hot-running engine.
7.4.2 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 posi-
tion 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 leak-
ing 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, 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. Slowly turn the radiator cap (1) 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 (2) and slowly remove to allow the coolant
to drain. Drain approximately two liters (2 quarts) of
coolant. Transfer the coolant into a properly labeled
container. Dispose of properly if coolant needs to be
replaced. Reinstall and tighten the drain plug.
7. Remove the two capscrews securing the thermostat
housing to the engine.
8. Remove the thermostat housing, old gasket and
thermostat. Clean all gasket surfaces. DO NOT let
any debris into the thermostat opening.
IMPORTANT: ALWAYS use the correct thermostat and
install a new gasket. NEVER operate the engine without
a thermostat, or engine damage will result.
MZ0080
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