SkyTrak 6036 Service Manual - Manual (Page 188)

Engine: Cummins 4BT3.9
7.10 Model 6036 Legacy
7.6.3 Radiator/Oil Cooler and Coolant
Heater 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 instrument cluster 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.
Note: If engine removal is required, the radiator and oil
cooler can be removed from the vehicle along with the
engine as one unit.
a. Oil Cooler and Radiator Removal
Note: Always install new hex-head elastic locknuts.
1. Level the vehicle, ground the attachment, place the
travel select lever in NEUTRAL (N), engage the
neutral lock lever, engage the parking brake switch
and shut off the engine.
2. Remove the ignition key. Secure accident prevention
tags to the steering wheel and key ignition switch.
(Refer to Section 1.5, “Accident Prevention Tag
Usage.”)
3. Unlock, unlatch and open the side and rear engine
access doors. Allow the engine to cool before
proceeding. Draining the cooling system while the
engine is hot can cause cracks in the engine block.
4. Disconnect the negative (-) battery cable (Fig. 7-7, 1)
and positive (+) battery cable (2) from the battery (3).
Disconnect the negative (-) grounding cable (4) from
the vehicle frame (5).
5. Remove the battery hold-down nuts (6) threaded
hold-down rods (7) and hold-down bracket (8).
Remove battery from vehicle. Store battery in a cool,
dry area.
Figure 7- 7 Battery and Cable Location
6. Slowly turn the radiator cap (not shown) to the first
stop, and allow any pressure to escape. Remove the
radiator cap.
7. Place a suitable container beneath the radiator
petcock (Fig. 7 -8, 1).
8. Place a funnel at the base of the radiator to channel
the drained coolant into the container. Open the
radiator petcock (Fig. 7-8, 1), and allow the coolant
to drain into a suitable container. Transfer the coolant
into a properly labeled container. Dispose of
properly. Close the radiator petcock.
Figure 7-8 Drain the Radiator
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.
WARNING:
Hot coolant can cause
severe burns or eye injury. NEVER remove the
radiator cap while the engine is hot. The
cooling system is under pressure. Wear
protective clothing and safety glasses.
MA8410
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OA1310
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