TM 10-5410-228-24
3.9.10 Thermal Expansion Valve Replacement Continued.
a. Removal (Refer to Figure 3-15)
The capillary tube and sensor bulb are fragile. Make sure the capillary tube and sensor bulb
are not damaged or detached from power assembly while removing/installing the thermal
expansion valve or other components.
(1)
Remove tape and insulation from tubing as required.
(2)
Remove two screws (1) securing valve body (2) to power assembly (3).
NOTE
Do not remove clamp.
(3)
Loosen two clamps (4) securing sensor bulb (5) to tube assembly (6).
(4)
Remove power assembly (3) with sensor bulb (5), capillary tube (7) and cage assembly (8) from
valve body (2) and ECU.
(5)
Remove grommet (9) from slot in frame of ECU.
(6)
Remove cage assembly (8) from power assembly (3).
(7)
Remove nut (10), lockwasher (11), two flat washers (12), screw (13) and clamp (14) securing
valve body (2) to mount (15). Discard lockwasher (11).
(8)
Remove two nuts (16), two lockwashers (17), four flat washers (18) and two screws (19) securing
mount (15) to ECU. Discard two lockwashers (17).
Removal and brazing of refrigerant tube assemblies shall be in accordance with safety
requirements. All safety requirements applicable to brazing of tubes shall be observed.
(9)
Remove valve body (2) from two tube assemblies (20 and 21) and evaporator coil distributor (22).
b. Installation (Refer to Figure 3-15)
(1)
Install valve body (2) on evaporator coil distributor (22) and two tube assemblies (21 and 20).
(2)
Install two screws (19), four flat washers (18), two new lockwashers (17) (Item 18, Appx E) and
two nuts (16) to secure mount (15) to ECU.
(3)
Install screw (13), two flat washers (12), clamp (14), new lockwasher (11) (Item 18, Appx E) and
nut (10) to secure valve body (2) to mount (15).
(4)
Position sensor bulb (5) on tube assembly (6) in a 4 or 8 o'clock position relative to tube
assembly (6).
(5)
Apply heat sink compound to contact area between sensor bulb (5) and tube assembly (6).
(6)
Tighten two clamps (4) to secure sensor bulb (5) to tube assembly (6).
(7)
Install grommet (9) (Item 5, Appx E) in slot on frame at ECU.
(8)
Route capillary tube (7) through grommet (9).
(9)
Apply oil to seals on cage assembly (8).
(10) Install cage assembly (8) in power assembly (3). Make sure lugs of cage assembly (8) align with
slots in power assembly (3).
(11) Install power assembly (3) in valve body (2).
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