Lull 944E-42 Service Manual User Manual download pdf (Page 717)

100

101

9.207

Model 644E-42/944E-42 Rev. 6/04

Electrical System

a. Cab Heater Controls Removal

Note: After determining which control knob is not

functioning, remove only the suspect control knob. In

order to remove either control, the cab heater and fan

control panel must be removed from the dash panel.

1. Unlock and open the engine cover (11).

2. If the vehicle has dual batteries, disconnect both

negative battery cables (12 and 13) from both

batteries.

To access the lower battery (14), loosen the knob

(15) far enough so that the lip (16) on the upper

battery box clears the knob. Lift up the upper battery

box (17) and swing it out, so that the box clears the

hydraulic tank support bracket, to gain access to the

lower negative battery cable (12). Disconnect the

lower negative battery cable.

3. Remove the setscrew from the variable speed fan

control knob (7) or temperature control knob (6).

4. Remove the screws (9) and backing locknuts from

the cab heater and fan control panel (10).

5. Pull the control panel out from the dash panel, and if

removing variable speed fan control (7), remove the

cab harness connector.

6. If removing the temperature control knob (6),

disconnect the cable connector and remove control

knob.

7. Remove the hex locknut from the suspect control

shaft.

8. Remove the control from the panel.

9. If removing the air conditioning rocker switch, label

and disconnect the cab harness connector. Carefully

pry the switch out of the mounting hole.

b. Disassembly

DO NOT disassemble the cab heater and air conditioning

variable speed fan, temperature controls or the air

conditioning switch. The controls and switch are not

serviceable. Replace controls or switch if found to be

defective.

c. Cleaning and Drying

Without submerging the variable speed fan, temperature

controls or the air conditioning switch, clean them with an

approved solvent and dry with a clean, lint-free cloth.

d. Inspection and Replacement

For additional information refer to Section 9.8.36, “Cab

Heater & Air Conditioning Blower Motor Circuit &

Troubleshooting.”

4110390

OU0780

MU0650

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