PR120H
MECHANICAL MAINTENANCE
Version: 5
Page: 18 of 24
Date: 2022.12.13
No Description Qty Material
1 Indicator screw 1 Stainless steel(304)
2 Indicator 1 Plastic(ABS)
3 Circlip 1 Stainless steel(304)
4 Thrust washer 1 Stainless steel(304)
5 Outside washer 1 polyoxymethylene
6 Body 1 Extruded aluminum alloy(6005-T5)
7 Guide(piston) 2 polyoxymethylene
8 O-ring(pinion top) 1 NBR
9 Bearing(pinion top) 1 polyoxymethylene
10 Inside washer 1 polyoxymethylene
11 Cam 1 #45
12 Pinion 1 #45
13 Bearing (pinion bottom) 1 polyoxymethylene
14 O-ring(pinion bottom) 1 NBR
15 Spring 0~12 Spring steel
16 Bearing (piston) 2 polyoxymethylene
17 O-ring(piston) 2 NBR
18 Piston 2 Die-Cast aluminum(101A)
19 Plug 2 NBR
20 O-ring(adjust screw) 2 NBR
21 Nut (adjust screw) 2 Stainless steel(304)
22 Adjust screw 2 Stainless steel(304)
23 Stop screw 2 Stainless steel(304)
24 Nut (stop screw) 2 Stainless steel(304)
25 O-ring(end cap) 2 NBR
26 End-cap 2 Die-Cast aluminum(ADC12)
27 End-cap screw 8 Stainless steel(304)
Disassembly of the actuator
1. Safely disconnect all electric power and supply lines connected to the actuator and or accessories.
2. Disassemble all the accessories of the actuator (solenoid, limit switch box, extra.)
3. Disassemble the actuator off the valve.
4. Remove indicator screw [1] if fit, Lift position indicator [2] off shaft, it may be necessary to pry gently with
a screwdriver.
5. Unscrew the end caps screw [27]
Caution: When the actuator is a spring return unit, make sure that the actuator is in the failed position
before disassembling.
6. Remove stroke adjustment screw [22] together with nut [21] and o-rings [20]
7. Remove the end caps [26]
8. To rotate the pinion [12] counterclockwise so that the pistons [18] will exit the body [6]
Caution: Air pressure should not be used to remove the pistons from body.
9. Remove the circlip [3] and the washers [4] and [5]
10. Remove the pinion [12] cam [11] and internal washer [10] from the body of the actuator, with
downward force to the top of pinion
11. Clean the components of the actuator perfectly
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