Figure 4-19. Expansion valve removal, repair and installation

TM 5-4120-356-14

REMOVAL

REFER TO PARAGRAPH 4-14 FOR PRELIMINARY

STEPS IN REMOVAL OF EXPANSION VALVE.

DISCONNECT EQUALIZER LINE FROM POWER

ASSEMBLY (2).

3. REMOVE BOLTS (1) FROM BODY FLANGE (7).

4. CAREFULLY LIFT OFF POWER ASSEMBLY (2).

5. REMOVE CAGE ASSEMBLY (3) AND THREE

GASKETS (4, 5, 6).

IF EXPANSION VALVE IS TO BE REPLACED,

DISCONNECT TUBING FROM BODY FLANGE

AND REMOVE BODY FLANGE FROM MOUNTING.

FREE EXPANSION VALVE POWER BULB (8)

BY REMOVING BLACK INSULATION TAPE AND

LOOSENING SCREWS IN CLAMP STRAP. RE-

MOVE TIES FROM CAPILLARY TUBE (9).

REPAIR

REFER TO REMOVAL PROCEDURES AND REMOVE EXPANSION VALVE. IT IS NOT NECESSARY TO REMOVE THE

POWER BULB OR THE BODY FLANGE UNLESS DEFECTS ARE FOUND IN ONE OR BOTH OF THESE ITEMS.

INSPECT POWER ASSEMBLY, CAGE ASSEMBLY AND BODY FLANGE FOR DAMAGE OR DEFECTS WHICH WOULD

IMPAIR SERVICEABILITY. IF SUCH DAMAGE OR DEFECTS ARE FOUND, REPLACE DEFECTIVE PARTS.

INSTALLATION

IF BODY FLANGE HAS BEEN REMOVED, POSITION BODY FLANGE ON MOUNTING PROVISION AND BRAZE

TUBING INTO PLACE.

APPLY HIGH VACUUM GREASE (NSN 9150-00-965-2408) OR EQUIVALENT, TO BOTH SIDES OF THREE

GASKETS (4, 5, 6) AND INSTALL GASKETS ON CAGE ASSEMBLY (3).

INSTALL CAGE ASSEMBLY INTO BODY FLANGE.

INSTALL THE POWER ASSEMBLY ON THE CAGE ASSEMBLY. MAKE SURE THE CAGE ASSEMBLY LUGS LINE UP

WITH THE SLOTS INSIDE THE POWER ASSEMBLY.

CAUTION

DO NOT OVERTORQUE BOLTS (1). OVERTORQUING

OF BOLTS MAY RESULT IN VALVE DAMAGE.

INSTALL TWO BOLTS (1). TIGHTEN BOLTS EVENLY TO 300 INCH POUNDS.

IF POWER BULB HAS BEEN REMOVED, PLACE IT IN THE SAME POSITION OF THE SUCTION TUBE FROM

WHICH IT WAS REMOVED, ASSURING CLEANLINESS AND GOOD PHYSICAL CONTACT.

SECURE POWER BULB BY TIGHTENING SCREWS IN CLAMP STRAP. WRAP POWER BULB WITH BLACK INSULA-

TION TAPE.

CAUTION

USE CARE IN APPLYING LEAK LOCK TO THE THREADS

OF THE EQUALIZER LINE FITTING, SO THAT NONE OF

THE MATERIAL GETS INSIDE THE REFRIGERANT SYSTEM

WHEN THE LINE IS INSTALLED.

APPLY LEAK LOCK (NSN 8030-00-999-6313) OR EQUIVALENT, TO THREADS OF THE EQUALIZER LINE

FITTING AND CONNECT THE EQUALIZER LINE TO THE POWER ASSEMBLY.

REFER TO PARAGRAPH 4-14j FOR FINAL STEPS IN THE INSTALLATION OF THE EXPANSION VALVE

ASSEMBLY.

TS54120-35614/419

F i g u r e 4-19. Expansion valve removal, repair and installation

4-45