311B, 312B, 315B, 320B, 322B, 325B and 330B Excavators Air Conditioning and Heating Refrigerant System - Flush Caterpillar


Refrigerant System - Flush
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Table 1
Required Tools    
Tool     Pt. No.     Part Description     Qty    
(A)     153-8537     Air Conditioner Flushing Unit     1    
(B)     153-9033     Adapter Kit     1    
(C)     153-8538     Refrigerant Flushing Solution     1    

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

Personal injury can result from contact with refrigerant.

This system is under pressure at all times, even if the engine is not running. Heat should never be applied to a charged system.

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 caution when a fitting is removed. Slowly loosen the fitting. If the system is still under pressure, evacuate the system recovering the refrigerant before removing the fitting.

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.

Before any checks of the air conditioning and heating system are made, move the machine to a smooth horizontal surface. Lower all implements to the ground. Make sure the transmission is in neutral or park and that the parking brake is engaged. Keep all other personnel away from the machine or where they can be seen.

----------------------


NOTICE

Do not use solvents, compressed air, etc., in order to clean any of the system components.


Flush the system if a component failure caused metal particles or other foreign material to be circulated through the system.

Debris in the system can cause a new compressor to fail immediately after starting. Use the following procedure in order to flush the system.

  1. Determine the type of refrigerant that is in the system.

    Note: Use a Refrigerant Identifier (analyzer) in order to prevent the contamination of tools from refrigerant that is not R-134a.

  1. Recover refrigerant.

    ReferenceRefer to Service Manual, "Air Conditioning and Heating" for procedures about the removal and about the installation of components.

  1. Remove the compressor.

  1. Remove the expansion valve.

  1. Remove the receiver-dryer.

  1. Flush the remainder of the system. Use the tools in Table 1.

    Note: Further instructions are provided with the Air Conditioner Flushing Unit .

  1. Replace any failed component.

  1. Install a new receiver-dryer.

  1. Install a new compressor.

    Note: A new compressor comes from the AVSpare parts department with the correct amount of refrigerant oil.

  1. Clean the expansion valve and determine the condition of the expansion valve.

  1. Install the expansion valve. If necessary, replace the expansion valve.

  1. Evacuate the system. Refer to the Testing and Adjusting, "Refrigerant System - Evacuate" section for the proper procedure.

  1. Charge the system. Refer to the Testing and Adjusting, "Refrigerant System - Charge" section for the proper procedure.

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