Lull 944E-42 Service Manual - Manual (Page 106)

Engine
7-4 944E-42
7.2 ENGINE SERIAL NUMBER
The Cummins QSB 4.5 serial number is stamped on a
plate which is typically located on the engine rocker
cover, but may be located on the side of the gear housing.
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 Cummins engine service instructions
(covering disassembly, inspection, internal repair,
assembly, adjustment and troubleshooting information)
are provided in the appropriate Cummins engine service
manual.
7.4 ENGINE COOLING SYSTEM
7.4.1 Radiator Pressure Cap
Use a 16 psi (1,1 bar) radiator cap. An incorrect or
malfunctioning cap can result in the loss of coolant and a
hot-running engine.
7.4.2 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, 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. Properly disconnect the batteries.
5. Remove the engine cover.
6. Slowly turn the radiator cap (1) to the first stop and
allow any pressure to escape. Remove the radiator
cap.
7. Place a suitable container beneath the radiator
drain.
8. Place a funnel at the base of the radiator to channel
the drained coolant into a container. Loosen the
drain petcock (2) and slowly 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 petcock (2).
9. Label, disconnect and cap the hoses attached to the
hydraulic oil cooler (3). Cap all fittings to keep dirt &
debris from entering the hydraulic system.
10. Label, disconnect and cap the hoses attached to the
transmission oil cooler (4). Cap all fitting to keep dirt
& debris from entering the system.
11. Unplug the electrical connection (5) at the radiator
fan (6).
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