325F Excavator Machine Systems Heating and Air Conditioning Unit - Remove and Install Caterpillar


Heating and Air Conditioning Unit - Remove and Install
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325F Excavator Machine Systems [UENR6794]
OPERATOR STATION
AIR CONDITIONER GP
325F Excavator Machine Systems Heating and Air Conditioning Unit - Remove and Install
1.1. Removal Procedure
3.1. Installation Procedure
4.1. Disassembly Procedure
5.1. Assembly Procedure

Removal Procedure

Start By:

  1. Remove the seat.

------ WARNING! ------

Personal injury can result from contact with refrigerant.

Contact with refrigerant can cause frost bite. Keep face and hands away to help prevent injury.

Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.

Always use precaution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated area.

Personal injury or death can result from inhaling refrigerant through a lit cigarette.

Inhaling air conditioner refrigerant gas through a lit cigarette or other smoking method or inhaling fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or death.

Do not smoke when servicing air conditioners or wherever refrigerant gas may be present.

Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.


  1. Recover the air conditioning. Refer to Service Manual, SENR5664, "Air Conditioning and Heating Systems with R-134a Refrigerant" for the recovery and the charging procedure. Refer to Special Publication, NENG2500, "Air Conditioning Tools" for the correct tools.


    Illustration 1g02561096
    Under cab

  2. Disconnect hose assembly (3). Remove switch (2). Remove bolts (1).


    Illustration 2g02561097
    Under cab

  3. Clamp hoses (4) as shown to contain coolant. Disconnect hoses (4).


    Illustration 3g02561116

  4. Remove panels (5).


    Illustration 4g02561119

  5. Remove duct (7). Remove frame (8).


    Illustration 5g02561121

  6. Disconnect harness assemblies (9). Disconnect antenna leads (10).


    Illustration 6g02561122

  7. Disconnect harness assemblies (11).


    Illustration 7g02561123

  8. Disconnect harness assembly (12).


    Illustration 8g02561133

  9. Disconnect harness assembly (13).


    Illustration 9g02561576

  10. Open panel (14).


    Illustration 10g02561577

  11. Relocate harness assembly (15). Remove filter housing (16).


    Illustration 11g02561176

  12. Remove bolts (20). Remove ducts (19). Remove air conditioner group (21).

Installation Procedure

  1. Install air conditioner group (21) in the reverse order of removal.

Disassembly Procedure



    Illustration 12g02566678

  1. Disconnect harness assembly (1). Remove actuator motor (2).


    Illustration 13g02566681


    Illustration 14g02564117

  2. Remove cover (3). Disconnect harness assemblies (5). Remove actuator motors (4). Slide out core (6).


    Illustration 15g02566716


    Illustration 16g02566717

  3. Remove cover (7). Remove evaporator (8).


    Illustration 17g02566720

  4. Disconnect harness assembly (9) from blower control.


    Illustration 18g02561537

  5. Disconnect harness assembly (12). Remove hose (11). Remove fan (10).

Assembly Procedure



    Illustration 19g02561537

  1. Install fan (10). Connect harness assembly (12). Install hose (11).


    Illustration 20g02566720

  2. Connect harness assembly (9) to blower control.


    Illustration 21g02566717


    Illustration 22g02566716

  3. Install evaporator (8). Install cover (7).


    Illustration 23g02564117


    Illustration 24g02566681

  4. Slide in core (6). Install cover (3). Install actuators motors (4). Connect harness assemblies (5).


    Illustration 25g02566678

  5. Install actuator motor (2). Connect harness assembly (1).

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