Thermo King T-1080S, Maintenance Manual

Page: 148 / 191

Refrigeration Service Procedures
147
Figure 234: Align Arrowhead Marks
c. Install the four screws and torque them to
4.43 ± 0.37 ft-lb (6.0 ± 0.5 N•m).
4. Connect the ETV harness or ETV to the main
wire harness at the four-pin connector.
5. Pressurize the low side and test for leaks.
6. If no leaks are found, replace the liquid line
drier then evacuate the low side.
7. Install the evaporator access panels.
8. Open the refrigeration valves and place the
unit in operation.
Reassembly of Piston and Stepper
Motor on Old Style ETV
Use the following procedure to reassemble the
piston and stepper motor if the piston has
accidentally been turned off of the threaded shaft
of the stepper motor.
1. Disassemble the stepper motor and piston
assembly by unscrewing the stepper motor
(small hex) from the piston nut (large nut).
2. Insert the piston into the piston nut. You must
align the rectangular shaft on the piston with
the rectangular hole in the piston nut to allow
the piston to be inserted into the piston nut.
3. Push the piston into the piston nut until the
end of the rectangular shaft is about even with
the top of the piston nut.
4. Make sure the copper washer is in place in the
top of the piston nut.
5. Place the threaded shaft of the stepper motor
into the rectangular shaft of the piston and
turn the piston and piston nut onto the
threaded shaft of the stepper motor.
6. When the threads in the top of piston nut reach
the threads on the bottom of the stepper motor,
carefully continue to turn the piston and piston
nut onto the stepper motor. Make sure that the
copper washer is in place and take care to
avoid cross threading the fine threads on the
stepper motor and in the top of the piston nut.
1. Piston
2. Rectangular Shaft on Piston
3. Piston Nut
4. Copper Washer
5. Threaded Shaft of Stepper Motor
6. Stepper Motor
Figure 235: Stepper Motor and
Piston Assembly Components
ARA2504
1 2 3 4 5 6
1. Align Rectangular Shaft on Piston
with Rectangular Hole in Piston Nut
Figure 236: Insert Piston into Piston Nut
1. Position End of Rectangular Shaft
about Even with Top of Piston Nut
Figure 237: Push Piston into Piston Nut
1
1