Air Conditioning Compressor Pressure Switch Is Not Working On Certain Series C Articulated Trucks {1408} Caterpillar

Articulated Truck

735C (S/N: LFJ1-UP; TFJ1-UP)

740C EJECTOR (S/N: TFN1-UP)

745C (S/N: LFK1-UP; TFK1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the following solution.

Illustration 1	g06001162
View showing air conditioning compressor pressure switch and wires secured with cable strap (1) 355-3148 Pressure Switch (2) 3S-2093 Cable Strap

Problem

An improper connection of the wires on air conditioning compressor pressure switch (1) may be caused from the wires being pulled too tightly by over-tightening cable strap (2).

Solution

Perform the following instructions to resolve the improper connection of the wires on the air conditioning compressor pressure switch.

1. When checking the connection of the wires on air conditioning compressor pressure switch, if an improper connection is found:

   1. Remove the original cable straps which secure the wires to the air conditioning compressor pressure switch.
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      Illustration 2	g06001172
      View showing air conditioning compressor pressure switch and wires correctly secured with cable straps (1) 355-3148 Pressure Switch (2) 3S-2093 Cable Straps (3) 25 mm loop

   2. Position the wires forming 25 mm loop (3) above pressure sensor (1) to achieve a proper connection.

   3. Use two cable straps (2) to secure the wires as shown in Illustration 2.

      Note: Ensure that the cable straps are not over-tightened which can cause an improper connection.

   4. Verify the operation of the air conditioning compressor pressure switch.