GP Compressor Motor Housing to Bearing Housing Oring Replacement

Issue:

GP Compressor Motor Housing to Bearing Housing Oring Replacement

Resolution:

GP - Motor-to-Bearing Housing O Ring Replacement

Assuming the compressor is already pulled down and exposed to atmosphere, perform the following:

1. Unbolt the discharge and suction service valves from the compressor.

2. Disconnect the solenoid valve coils, high pressure cutout switch flare, and oil line at the bearing housing.

3. Loosen all the bolts at the motor-bearing housing mating surface. The oil filter housing bolts do not need to be removed.

4. Use an extension and a minimum of a 250 ft-lb impact wrench to loosen the motor rotor bolt. If the rotors continue to spin, it may be necessary to increase the size, or, after loosening the bearing housing bolts, slide the housings apart enough that a maintained pressure will prevent the rotors from turning while the bolt is loosened.

5. Loosen the rotor bolt and bearing housing bolts enough so the O ring can be removed, and the O ring groove inspected for damage. Clean the groove and mating surfaces.

6. Cover all sharp edges with smooth plastic, and slightly stretch the new O ring over the bearing housing. It is important that the new O ring not rub against any rough or sharp edges.

7. Put a thin film of gasket eliminator such as Loctite 515 on the new O ring and install.

8. Reassemble the motor and bearing housings. Install the motor-rotor bolt with one or two drops of Loctite 271 and torque to 150 ft-lb.

9. Torque the motor-bearing housing bolts to 170 ft-lb. If the rotor begins to spin while the impact wrench is being used, allow the wrench to stop until the rotor stops turning, then reapply torque.

10. Install new gaskets and replace the suction and discharge service valves. Torque to 175 ft-lb.

Notes:

Refer to RTAA-SVB12A-EN for detailed instructions.

Resource Available:

• Tech TV Video(s):
  • N/A
• Reference Literature: (Electronic copies can be pulled from e-library at Trane Residential (tranetechnologies.com))
  • IOM: 
  • Service Guide: RTAA-SVB12A-EN
• Other:
  • N/A

Changes:

Other Question/Problem/Cause Statements:

• Leak on compressor between motor and bearing housing.
• GP Compressor Motor Housing to Bearing Housing Oring Replacement
• Leak on compressor between motor housing and bearing housing.
• Is the leak at the split of the compressor field repairable?

Facts:

• RTAA 70-125 Ton (Pueblo)
• Compressor Chiller (Pueblo) (RTUA)
• Water-Cooled Chiller (Pueblo) (RTWA)
• Air-Cooled Chiller (Pueblo) (RTAA 70-125 Ton)