Thermo King SB-210, Manual

Page: 109 / 159

109
Refrigeration Service Operations
NOTE: It is generally good practice to replace
the filter drier whenever the high side is opened
or when the low side is opened for an extended
period of time.
Compressor
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Loosen the compressor belts on Model 50
units.
3. Front seat the discharge and suction service
valves.
4. Recover the refrigerant remaining in the
compressor.
5. Unbolt the discharge and suction service
valves from the compressor.
6. Disconnect the high pressure cutout switch,
the pilot solenoid line, and remove the
compressor oil filter.
7. Support the compressor and remove the
compressor mounting bolts from the flywheel
housing.
8. Lift the service valves out of the way.
9. Slide the compressor to the left until the
coupling pins are clear, and remove the
compressor belts from Model 50 units.
10. Remove the compressor from the front of the
unit. Keep the compressor ports covered to
prevent dust, dirt, etc., from falling into the
compressor.
NOTE: When the compressor is removed
from the unit, the oil level should be noted,
or the oil removed from the compressor
should be measured so that the same amount
of oil can be added before placing the
replacement compressor in the unit.
Installation
1. Slide the compressor into the unit.
2. Place the compressor in position, install the
compressor belts on Model 50 units, and
install the mounting bolts.
NOTE: The compressor drive coupling or
clutch will only slide onto the coupling pins
in either of two positions, which are 180
degrees apart.
3. Install the service valves using new gaskets
soaked in compressor oil. Connect the high
pressure cutout switch, the pilot solenoid
valve line, and install the compressor oil filter.
4. Pressurize the compressor and test for
refrigerant leaks.
5. If no leaks are found, evacuate the
compressor.
6. Back seat the suction and discharge service
valves.
7. Tighten the compressor belts on Model 50
units.
8. Operate the unit at least 30 minutes and then
inspect the oil level in the compressor. Add or
remove oil if necessary.
9. Check the refrigerant charge and add
refrigerant if needed.
Compressor Coupling Removal
(Model 30)
1. After the compressor has been removed from
the unit, use the appropriate Allen tool
provided with removal tool P/N 204-991 to
loosen the center bolt which holds the
coupling to the compressor shaft.
2. Attach the tool to the coupling with the
provided socket head screws and spacers. Two
sets of spacers are provided with the tool, use
the short spacers with shallow compressor
mounting flanges and the longer set for deeper
flanges. The side with the countersunk holes
should be toward the coupling.
3. To prevent the tool and crankshaft from
rotating, use one of the compressor to engine
mounting screws to pin the tool to the flange.
If a nut is used to prevent the bolt from falling
out, the nut should not be tightened.