Thermo King 919180, Manual

Page: 109 / 148

Refrigeration Service Operations
109
Three-way Valve Repair
NOTE: The three-way valve can be repaired in
the unit if leakage or damage to the Teflon seals
should occur.
Removal
1. Remove the refrigerant charge.
2. Clean the exterior surface of the valve.
3. Remove the 1/4 in. copper line from the
three-way valve to the pilot solenoid.
4. Loosen the four 1/4 in. Allen head screws
(do not remove); use tool (see Tool Catalog) to
break the gasket at each side of the center
section.
5. Unsolder the condenser line from the
condenser.
6. Remove the 4 bolts from the valve.
7. Remove the top cap and spring.
8. Remove the spring clip. Observe the slot in
the spool shaft and slide piston away from this
slot.
9. Remove the piston.
10. Remove the center section and stem assembly.
11. Inspect the following parts for wear and
damage:
a. Bottom cap sealing and support areas
b. Center section, sealing surface
c. Top cap, sealing and support surface
The following parts will be discarded:
a. Stem assembly
b. All gaskets
c. Teflon seal and o-ring
12. Remove the screen.
NOTE: The valve body cannot be reconditioned.
Seat positions change and improper sealing will
result.
CAUTION: Do not force the tool into the
brass or against the bolts.
1. Screw 8. O-ring
2. Top Cap 9. Gasket
3. Cap 10. Clip
4. Check Valve Assembly 11. Seat
5. Spring 12. Stem Assembly
6. Piston 13. Screen
7. Teflon Seal 14. Bottom Cap
Figure 67: Three-way Valve Assembly