Lull 944E-42 Service Manual - Manual (Page 216)

Engine: Cummins 4BT 3.9, B4.5T and QSB 4.5T
7.14 Model 644E-42/944E-42 Rev. 6/04
7.6.4 Radiator, Transmission Oil Cooler and
Hydraulic Oil Cooler 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, Transmission Oil Cooler and Hydraulic
Oil Cooler Removal
1. Park the vehicle on a firm, level, surface. Level the
vehicle, ground the attachment, place the travel
select lever in the (N) NEUTRAL DETENT position,
engage the parking brake switch and shut off the
engine.
2. Secure accident prevention tags to the steering
wheel and ignition switch. (Refer to Section 1.5,
“Accident Prevention Tag Usage.”)
3. Allow the engine to cool before proceeding. Draining
the cooling system while the engine is hot can cause
cracks in the engine block.
4. Remove the engine hood. (Refer to Section 4.8.2, a.
“Engine Hood Removal,” for proper removal
procedures.)
5. If the vehicle has dual batteries, disconnect both
negative battery cables (1 and 2) from both
batteries.
To access the lower battery (3), loosen the knob (4)
far enough so that the lip (5) on the upper battery box
clears the knob. Lift up the upper battery box (6) and
swing it out, so that the box clears the hydraulic tank
support bracket, to gain access to the lower negative
battery cable (1). Disconnect the lower negative
battery cable.
6. Slowly turn the radiator cap (7), located near the
upper radiator hose, to the first stop and allow any
pressure to escape. Remove the radiator cap. Place
a hose (8) onto the drip leg of the petcock, located at
the base of the radiator to channel the drained
coolant into a container. Open the radiator petcock
(9) and allow the coolant to drain. Transfer the
coolant into a properly labeled container. Dispose of
properly. Close the radiator petcock (9) when
finished and then remove the hose (8).
WARNING:
DO NOT attempt this
procedure when the engine is hot. Wait for the
engine, muffler, and tailpipes to cool down
before proceeding. Failure to do so could result
in severe burns.
MU0650
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MU1440
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