FLOORPLATE ASSEM. (center) 4V6551 - Caterpillar

Dye
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.
Personal injury can result from hot coolant. Any contact with hot coolant or with steam can cause severe burns. Allow cooling system components to cool before the cooling system is drained.
Table 1
Required Tools    
Part Number     Part Description     Quantity    
192-2331     Leak Detection Lamp Gp     1    In the middle of 1999, Caterpillar began installing dye in the refrigeration systems of Caterpillar machines. The dye is used in order to assist in identifying points of leakage in the refrigeration system.Finding leaks and repairing leaks from refrigerant is important since the air conditioner is a closed circuit system.The system must contain at least 0.4 kg (.88 lb) of refrigerant. Install the manifold gauge set. The manifold gauge set can determine if pressure exists in the system. A leak test can be performed if the system indicates pressure.Note: Refrigerant vapor is heavier than air. For best results, place the black light directly below possible leaks.Note: Leaks that are in the high-pressure side of the system are more easily found if the air conditioner is operated for 5 to 10 minutes. The leak test must be performed immediately after the unit is turned OFF. The leak test for the high-pressure side is performed before the pressures in the system equalize. Leaks that are in the low-pressure side of the system are more easily found if the air conditioner has been turned OFF for 5 to 10 minutes. The leak test for the low-pressure side is performed after the pressures in the system equalize.
Move the black light along possible leak points. When a leak is present, the black light will illuminate the dye that is in the refrigerant.Note: Leaks that are indicated by the presence of dye should always be