HUB 1920876 - Caterpillar

Illustration 1. Ducts Installed On The Lunch Box
(A) 230-4621 Duct
(B) 230-4620 Duct
The 230-4620 Duct and the 230-4621 Duct improve the airflow in the cab for the operator. The ducts snap into position. Remove the airflow louvers from the lunch box. Reinstall the louvers in the ducts. The ducts are snapped into position in order to replace the louvers on the lunch box.
Evaporator Core Temperature Sensor Relocation
Relocating the evaporator core temperature sensor may improve the vent temperature by 2.7-4.4? C (5-8? F).
Note: New software must be flashed in the 171-2545 Control Assembly or in the 233-9518 Control Assembly when the sensor is relocated. Use a 232-4958 Test Circuit Assembly in order to flash the new software.
Illustration 2. Dimensions For Temperature Sensor Location
(A) 70.0 mm (2.75 inch)
(B) 56.0 mm (2.25 inch)
Illustration 3. Pictorial View Of The Temperature Sensor Location
Insert the probe into the coil fins at a 45? angle. Insert the probe to a depth of 82 mm (3.2 inch). Secure a cable strap to the probe in order to make sure that the probe is not inserted deeper than the specified dimension. Refer to Illustration 2 and Illustration 3 for the correct location of the temperature sensor.
Illustration 4. Wire Routing For The Temperature Sensor
Illustration 5. Sensor Wire Routing Between The Filter Inlet And
The Main Case
Route the evaporator sensor wire between the joint of the filter inlet housing and the main case. Relocation of the evaporator sensor is completed.
Use the following procedure to reflash the controller:
Remove the 168-4605 Control Panel Group. Insert a thin blade screwdriver into the slot in order to release the spring-loaded clips on each end of the control panel. The panel is easily removed when the clips are released.
Unplug the 4-pin connector. The short harness to the control panel may require the use of a screwdriver in order to release the retainer clip on the DT connector.
Plug the 4-pin connector into the 232-4958 Test Circuit Assembly.
Turn the key for the engine start switch to the ON position. The 232-4958 Test Circuit Assembly will power up the heating and air conditioning control and the blower fan.
Turn the key for the engine start switch to the OFF position.
Unplug the 232-4958 Test Circuit Assembly. Reconnect the control panel to the 4-pin connector.
Turn the key for the engine start switch to the ON position.
Push the fan speed knob in order to power the system ON.
Hold down both the automatic temperature control switch and the fan speed knob. The control panel will display the parameter codes 0 through 20 and parameter code 36 on the Liquid Crystal Display (LCD) panel. Rotate the fan speed knob clockwise through the parameter codes.
Check parameter value "08P". The cutoff temperature for the compressor should be ?0.5? C (31? F). Reference Testing and Adjusting, RENR3899, "Troubleshooting Air Conditioner Control (Parameter Codes)".
Relabel the control assembly to identify it as a 231-2790 Control Assembly. The 231-2790 Control Assembly has a 08P parameter value that is set to ?0.5? C (31? F). The reprogramming is complete.
Drain Tube Damage
Damage to