770 and 772 Off-Highway Truck/Tractors Evaporator Coil - Remove and Install Caterpillar


Evaporator Coil - Remove and Install
`
1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Start By:

  1. Remove the right side engine enclosure. Refer to Disassembly and Assembly, "Sound Suppression - Remove and Install".

Note: Put identification marks on all hoses, on all hose assemblies, on all harness assemblies, and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss, and this helps to keep contaminants from entering the system.

------ 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 conditioner refrigerant from the air conditioner system. Refer to Service Manual, SENR5664, "Air Conditioning and Heating Systems with R-134a Refrigerant" for the correct procedure. Refer to Special Publication, NEDG2500, "Air Conditioning Tools" for the correct tools.


    Illustration 1g01392126

  2. Remove cover (1) and filter (2).


    Illustration 2g01392160

  3. Remove bolts (3). Remove cover (4).


    Illustration 3g01392402

  4. Remove bolts (5).


    Illustration 4g01392409

  5. Remove bolts (6).


    Illustration 5g01392416

  6. Remove cover (7).


    Illustration 6g01392420

  7. Remove bolt (9). Remove panel assembly (8).


    Illustration 7g01392425

  8. Turn valves (10) to the OFF position.


    Illustration 8g01392447

  9. Loosen clamp (11) and disconnect hose (12). Disconnect harness assembly (13).


    Illustration 9g01392479

  10. Disconnect hose assemblies (14). Loosen clamp (15) and disconnect hose (16).


    Illustration 10g01392577

  11. Remove nuts (17) from both sides of air conditioner assembly (18).

  12. Use two people in order to remove air conditioner assembly (18). The weight of air conditioner assembly (18) is approximately 32 kg (70 lb).


    Illustration 11g01392590

  13. Remove bolts (20). Remove plate (19).


    Illustration 12g01392603

  14. Remove bolts (21). Remove plate (22).


    Illustration 13g01392610

  15. Remove bolt (23).


    Illustration 14g01392616

  16. Mark the position of tube (25) and position tube (25) out of the way.

  17. Remove bolts (26) and remove evaporator coil (24).

Installation Procedure

Note: Cleanliness is an important factor. Before you begin the installation procedure, the exterior of the components should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.



    Illustration 15g01392616

  1. Position evaporator coil (24) and install bolts (26). Reposition tube (25) into the marked locations.


    Illustration 16g01392610

  2. Install bolts (23).


    Illustration 17g01392603

  3. Position plate (22) and install bolts (21).


    Illustration 18g01392590

  4. Position plate (19) and install bolts (20).


    Illustration 19g01392577

  5. Use two people in order to position air conditioner assembly (18). The weight of air conditioner assembly (18) is approximately 32 kg (70 lb).

  6. Install nuts (17) on both sides of air conditioner assembly (18).


    Illustration 20g01392479

  7. Connect hose assemblies (14). Connect hose (16) and tighten clamp (15).


    Illustration 21g01392447

  8. Connect harness assembly (13). Connect hose (12) and tighten clamp (11).


    Illustration 22g01392425

  9. Turn valves (10) to the ON position.


    Illustration 23g01392420

  10. Position panel assembly (8) and install bolt (9).


    Illustration 24g01392416

  11. Install cover (7).


    Illustration 25g01392409

  12. Install bolts (6).


    Illustration 26g01392402

  13. Install bolts (5).


    Illustration 27g01392160

  14. Position cover (4) and install bolts (3).


    Illustration 28g01392126

  15. Install filter (2) and install cover (1).

  16. Charge the air conditioner refrigerant from the air conditioner system. Refer to Service Manual, SENR5664, "Air Conditioning and Heating Systems with R-134a Refrigerant" for the correct procedure. Refer to Special Publication, NEDG2500, "Air Conditioning Tools" for the correct tools.

End By:

  1. Install the right side engine enclosure. Refer to Disassembly and Assembly, "Sound Suppression - Remove and Install".

Information System:

C6.6 Engines for Caterpillar Built Machines Crankshaft Front Seal - Remove and Install
C6.6 Engines for Caterpillar Built Machines Vibration Damper and Pulley - Remove - Pulleys without Split Lock Rings
C6.6 Engines for Caterpillar Built Machines Vibration Damper and Pulley - Install - Pulley with Split Lock Rings
C6.6 Engines for Caterpillar Built Machines Vibration Damper and Pulley - Install - Pulleys without Split Lock Rings
C6.6 Engines for Caterpillar Built Machines Vibration Damper and Pulley - Remove - Pulley with Split Lock Rings
C6.6 Engines for Caterpillar Built Machines Flywheel Housing - Remove and Install - Wet Back End Housing
C6.6 Engines for Caterpillar Built Machines Flywheel Housing - Remove and Install - Standard Housing
C6.6 Engines for Caterpillar Built Machines Crankshaft Rear Seal - Install
C6.6 Engines for Caterpillar Built Machines Crankshaft Rear Seal - Remove
C6.6 Engines for Caterpillar Built Machines Flywheel - Install
24M Motor Grader Power Train Electronic Control System MID 027 - CID 0379 - FMI 03
C6.6 Engines for Caterpillar Built Machines Flywheel - Remove
C6.6 Engines for Caterpillar Built Machines Front Cover - Remove and Install
C6.6 Engines for Caterpillar Built Machines Gear Group (Front) - Remove and Install
C6.6 Engines for Caterpillar Built Machines Idler Gear - Remove
C6.6 Engines for Caterpillar Built Machines Idler Gear - Install
C6.6 Engines for Caterpillar Built Machines Housing (Front) - Remove
C6.6 Engines for Caterpillar Built Machines Housing (Front) - Install
C6.6 Engines for Caterpillar Built Machines Accessory Drive - Remove and Install
C6.6 Engines for Caterpillar Built Machines Crankcase Breather - Remove - Unfiltered Breather
C6.6 Engines for Caterpillar Built Machines Crankcase Breather - Remove - Filtered Breather
C6.6 Engines for Caterpillar Built Machines Crankcase Breather - Install - Unfiltered Breather
C6.6 Engines for Caterpillar Built Machines Crankcase Breather - Install - Filtered Breather
C6.6 Engines for Caterpillar Built Machines Valve Mechanism Cover - Remove and Install - Composite Valve Mechanism Cover