Emerson Hytork XL Series - Changing Spring Sets on XL26 to XL681; Double-Acting End Cap Disassembly; Piston Disassembly; Pinion Disassembly

November 2022
Installation, Operation and Maintenance Manual
MAC050515 EN Rev. 0
13Disassembly Procedure
Section 9: Disassembly Procedure
9.2 Changing Spring Sets on XL26 to XL681
I f only the springs set of the actuator has to be changed, perform steps 1 to 9. These steps
can be performed at both end caps simultaneously or at one end cap only. After step 9,
unscrew the adjusting nut on the retractor rod relieving the spring force while preventing the
rod from turning with a wrench on the hold nuts.
9.3 End Cap Disassembly on Double-Acting Actuators
Remove the SAFEKEY as described previously. The retractor rod is not required for
Double-Acting actuators. Remove the end caps by pulling them free from the body
keeping them square to the end face of the body (11).
9.4 Piston Disassembly
Rotate the pinion using a wrench to drive the pistons apart and remove from the body by
pulling the pistons.
9.5 Pinion Disassembly
Remove the snap ring (Circlip) (6), thrust washer (25) and DURASTRIP thrust bearing (5)
from the top of the pinion and CAREFULLY push the pinion from the body through the
bottom. Take care that the pinion does not damage the pinion bores on removal.
If necessary, remove any burrs, etc. from the top of the pinion before removal.
Carefully remove pinion top bearing (9) from the body.
9.6 Inspection
Clean and examine all parts for damage and wear. Emerson recommends O-Rings,
DURASTRIP bearings, SAFEKEYS, washers, etc. are replaced using a Hytork XL spares kit.
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2/3
4
5
6
7
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2/3
4
5
6
4
4
End cap disassembly
steps XL26 to XL681
End cap disassembly
steps XL1127 to XL4581
Extractor rods
Extractor
plates
Hold nuts
Adjusting nut
Figure 4 End Cap Disassembly