JLG 4013PS Service Manual - Manual (Page 70)

Cab and Covers
4-8 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
4.3.9 Heater/Defroster System
a. Heater Assembly Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the transmission control lever in
(N) NEUTRAL, engage the park brake and shut the
engine OFF.
2. Place a Do Not Operate 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.
4. Properly disconnect the battery.
5. Remove the belly pan.
6. Slowly turn the radiator cap to the first stop and allow
any pressure to escape. Remove the radiator cap.
7. Place a funnel at the base of the radiator to channel
the drained coolant into the container. Loosen the
drain plug and slowly remove to allow the coolant to
drain. Transfer the coolant into a suitable, covered
container and label as "Used Coolant". Dispose of
the used coolant at an approved recycling facility.
Clean and reinstall the drain plug.
8. Remove the cab bottom and heater shield (5).
9. Remove the cab floor mat to gain access to the
heater assembly mounting bolts.
Note: Label all hoses to ensure correct installation.
10. Loosen the hose clamps and disconnect the heater
hoses (6).
11. Remove the heat duct hoses (7) from the back side
of the heating unit assembly.
12. Label and disconnect the electrical connectors
attached to the heater assembly.
13. Remove the heater assembly mounting bolts.
14. Carefully lift the heater assembly and remove from
the cab.
b. Heater Assembly Installation
1. Lower the heater assembly into the cab to its original
orientation. Secure with the previously used
hardware.
2. Connect the wiring harness connections to the
blower.
3. Connect the previously labeled hoses to the heater.
Secure with hose clamps.
4. Fill the cooling system completely with coolant,
allowing time for the coolant to fill the engine block.
The cooling system capacity is listed in Section 2.4,
“Fluids, Lubricants and Capacities.”
5. Properly connect the battery.
6. Start the engine and run at low idle. Check for any
visual signs of fluid leakage. STOP the engine
immediately if any leakage is noted, and make any
necessary repairs before continuing.
7. Wait for the engine to cool and check the coolant
level. Add coolant to the overflow bottle as required
to bring the coolant to the proper level.
8. Replace the cab bottom and heater shield.
MZ2050
5
MZ2040
6
7