JLG sky trak mmv Service Manual page 268

Engine: Cummins 4BTA 3.9
c. Engine Block Heater Removal
1. Level the vehicle, ground the attachment, place the
travel select lever in NEUTRAL [N] and engage the
neutral lock lever, engage the parking brake switch
and shut off the engine. Secure accident prevention
tags to the steering wheel and ignition switch (refer
to Section 1.5, Accident Prevention Tag Usage ).
WARNING:
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.
2. Unlatch and open the engine cover. Allow the engine
to cool before proceeding. Draining the cooling
system while the engine is hot can cause cracks in
the engine block.
3. Remove engine side battery box cover (19). Remove
wing nuts (20) and carriage bolts (21) and set cover
and mounting hardware aside for later re-assembly.
4. Disconnect the negative (-) battery cable (16) at the
negative (-) terminal on the battery in the engine side
battery box.
5. Disconnect the negative (-) cable (17) at the bottom
of the battery equalizer (18).
8.16
DO NOT attempt this
WARNING:
severe burns or eye injury. NEVER remove the
radiator cap while the engine is hot. The cool-
ing system is under pressure. Wear protective
clothing and safety glasses.
6. Place a suitable container beneath the radiator drain
plug (1) or petcock. Slowly turn the radiator cap (2),
located in the upper radiator hose, to the first stop
and allow any pressure to escape. Remove the
radiator cap.
3
1
Hot coolant can cause
2
MM2041
Model MMV Rev. 12/04