Lull 944E-42 Service Manual - Manual (Page 717)

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
1.
2.
OU0780
11
MU0650
12
13
14
15
16
17