WHEEL GP-FINAL DRIVE & BRAKE 3216787 - Caterpillar

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.
A special refrigerant oil is used in the air conditioning system. The oil mixes completely with the refrigerant so that all the components receive lubrication. A check of the refrigerant oil in the compressor will give an indication of the amount of oil that is in the system.Reference: Refer to System Operations, "Refrigerant Compressor" for more information.Note: Generally, the oil in the compressor is checked when there is evidence of a major loss of oil. The following conditions may cause the loss of oil:
Broken refrigerant hose
Hose fitting (leaks)
Badly leaking compressor seal
Component damageComplete Check of Compressor Oil
When the replacement of a component is necessary, follow the procedures below. The procedure determines the amount of refrigerant oil (lost oil) that is needed in the compressor.
Operate the engine at 1000 rpm. Set the temperature on maximum cooling setting. Move the fan speed switch to HIGH. The system will stabilize in a minimum of 10 minutes.
Stop the engine. Remove the refrigerant charge from the system. Install a plug in all open lines. Refer to Testing and Adjusting, "Refrigerant Recovery" for the proper procedure.
Remove the compressor from the machine. Place protective caps on all fittings and hoses.
Illustration 1 g00296421
(1) Pulley. (2) Hose (low pressure). (3) Hose (high pressure). (4) Electrical harness. (5) Service valve (low pressure). (6) Service valve (high pressure). (7) Plug (oil change). (8) Belt (engine driven component).
Place the compressor in a horizontal position so oil plug (7) is facing downward. Remove oil plug (7) from the compressor. Drain the oil into a clean container. Rock the compressor back and forth in order to remove all of the oil. Also, rotate the compressor shaft in order to drain the rest of the oil that is in the oil sump. Inspect the oil for the following items:
Contaminants
Metal chips
Rubber particles
Foreign