PR120H
MECHANICAL MAINTENANCE
Version: 5
Page: 19 of 24
Date: 2022.12.13
Inspection and maintenance
12. Inspect the components of the actuator for wear or damage and replace where necessary
13. Replace:
On the pinion: O-ring [8], [14]
On the end caps: End cap o-ring [25], O-ring (adjust screw) [20]
On the pistons: O-ring [17]
Assembly of the actuator
Before beginning the assembly to check always that all the o-rings and gaskets that is compatible with buna
or nitrile rubbers are properly housed in their lodgings, and all the components are greased correctly using a
standard commercial grease.
1. Refit the pinion [12] in the body of the actuator [6] ensuring the cam [11] is correctly fit during assembly.
Ensure the pinion will rotate in anticlockwise- clockwise when the stroke adjustment screws [22] are
refitted.
2. Fit washers [5], [4] and circlip [3] to the top of pinion.
3. Refit the pistons [18] in the body [6] keeping in mind that both pistons should engage the gear of the
pinion [12] at the same time.
4. For standard rotation assembly, Rotating the pinion [12] about 40~50o in a
clockwise direction until the pistons are correctly retracted. Check that the pinion output end is square to
the body and is in the correctly aligned.
Note: Obtaining the correct gear tooth and piston alignment could require more than one
attempt.
5. Mount the end cap [26] to the body and tighten the screws [27] distributing the force evenly until the end
cap is securely home. Caution should be taken not to "pinch" the
o-rings during this assembly procedure. In spring return actuators, it will be necessary to insert the spring
cartridges appropriately in their lodgings of the end caps according to the quantity of the springs you use
(see detail).
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