Table of Contents
Advertisement
Section 4: Disassembly Procedure
May 2021
4.2
Single-Acting Actuators
WARNING
!
Observe safety precautions. Remove air pressure and observe normal safety precautions,
including the use of eye protection. Always ensure that Spring-Return actuators are in
fail safe position before attempting any maintenance. Pay particular attention to this
requirement when manual operators are fitted.
1.
2.
3.
WARNING
!
High spring force. If after loosening the screws by 5 mm there is still compression on the
spring pack re-tighten the end cap screws and return the unit to the factory for service.
4.
WARNING
!
High spring force. Do not disassemble the precompressed spring packs, as the springs are
under high force.
5.
6.
7.
8.
9.
10.
8
Remove the indicator assembly (25) from the top of the actuator.
Remove both travel stop bolts (21), after slackening the lock nuts.
Loosen end cap fixing screws evenly (22) until the spring load is relaxed (3 - 5 mm).
Remove end caps (4) and spring packs. In order to avoid the springs falling out
place the actuator with the end cap on top.
Using a suitable wrench in the top of the pinion shaft (2), turn the shaft counter
clockwise to drive the pistons apart. Remove the pistons (3) complete with
backing pads/O-rings, etc.
Remove circlip (24) from the bottom bore of the actuator including thrust
washer (13).
Protect the actuator bore during pinion disassembly, and tap pinion shaft
downward. The travel stop cam (5) is firmly attached to the pinion and needs
to be released before removing the pinion from the actuator body.
Remove the pinion, but take care to protect the actuator bore.
Remove top and bottom O-rings (16 and 17) from the pinion shaft.
Remove top and bottom bearings (10 and 11) from the pinion shaft.
Installation, Operation and Maintenance Manual
DOC.IOM.BRX.EN Rev. 2
Disassembly Procedure
Advertisement
Table of Contents
