Thermo King T-1080S, Maintenance Manual

Page: 137 / 191

Refrigeration Service Procedures
136
Compressor Shaft Seal Change
Procedure
Thermo King recommends changing the
compressor shaft seal when there is a major
system interruption, such as component
replacement or total loss of refrigerant charge.
When the shaft seal is changed, Thermo King also
recommends changing the compressor oil and oil
filter.
The steps for changing the shaft seal are as
follows:
1. Recover refrigerant. Equalize pressure to
slightly positive.
2. Remove compressor.
3. Remove drive pulley and Woodruff key from
the shaft.
4. Clean shaft seal cover of excess dirt.
5. Remove four Torx head screws from shaft seal
cover.
6. Carefully pry the shaft seal cover out of
compressor body using flats at top and bottom
of shaft seal cover.
7. Remove the old hard ring, lip seal, and o-rings
from the seal cover.
8. Loosen the set screws that secure the bellows
to the shaft. These set screws typically use an
1/8 inch Allen wrench which is provided with
the new seal.
9. Remove the old bellows from the shaft. Use a
small prybar or screwdriver on each side of
the bellows, but do not scratch the shaft when
removing the bellows. Be careful not to lose
the spacer that is on the shaft.
10. Ensure the spacer is properly located on the
shaft flat.
11. Back out the set screws from the new bellows
and apply a small amount of blue Loctite 242
(P/N 203-400) to the set screw threads.
12. Apply clean compressor oil to the o-ring
inside the bellows and place the bellows on
the shaft. Leave the orange protective cap on
the bellows.
CAUTION: Keep the orange protective
cap in position until final assembly.
1. Clamp Ring
2. Orange Protective Cap
Figure 222: Cross Section of Set Screw Type
Bellows
1. Set Screw
2. Seal Faces
3. Hard Ring
4. O-ring
5. Bellows
Figure 223: Set Screw Type Bellows Seal
2
1
AGA576
1
2
5
4
3
AGA577