Thermo King T-500R Maintenance Manual page 220

Stepper Motor and Piston Assembly with Piston in Fully Open Position
2. Old Style ETV Only:
a. Lubricate the piston and threads on the new stepper motor and piston assembly with refrigeration oil.
b. Screw the new stepper motor and piston assembly into the valve body.
c. Torque the nut to approximately 118 fT-lb (160 N•m). Hold the valve body with backup wrench to prevent damage to the
refrigeration tubing.
3. New Style ETV Only:
a. Lubricate the O-rings with refrigeration oil. Place one on the stepper motor and piston assembly and place the other in the
valve body.
1
2
1. Bottom Edge of Brass Nut/Piston Housing
2. Bottom Edge of Piston
1
ARA2502
1. Install O-Ring on Stepper Motor and Piston Assembly
2. Install O-Ring in Valve Body
Install O-Rings
Refrigeration Maintenance
ARA2501
0.3 in.
(8 mm)
2
1
2
ARA2503
10-36