Emerson Hytork XL26 Installation, Operation & Maintenance Instructions Manual page 5

Installation Operation & Maintenance Instructions
MAC050515 EN Rev. C
May 2016
11 To keep the Spring Pack Assembly intact (see Fig. 5), leave the
Retractor Rod in place. To disassemble the Spring Pack, 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.
9.2 Changing spring sets on XL26 to XL681
12 If 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 re-
lieving 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
13 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.
9.4 Piston disassembly
14 Rotate the Pinion using a wrench to drive the Pistons apart and
remove from the Body by pulling the Pistons.
9.5 Pinion disassembly
15 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.
16 Carefully remove Pinion Top Bearing (9) from the Body.
9.6 Inspection
17 Clean and examine all parts for damage and wear. Emerson Pro-
cess Management recommends 'O' Rings, DURASTRIP Bear-
ings, SAFEKEYS, Washers, etc. are replaced using a HYTORK
XL Spares Kit.
End cap disassembly steps
End cap disassembly steps
XL1127 to XL4581
Fig. 5 End Cap Disassembly
1
XL26 to XL681 2/3
1
2/3
10 Assembly Instructions
Note: The grease used in ALL HYTORK Standard Model Actua-
tors is a Lithium Based Grease. Check with EMERSON PROCESS
MANAGEMENT for high and low temperature applications.
10.1 Pinion assembly
1 Lightly grease all 'O' Rings, 'O' Ring grooves, bearing grooves
and Pinion.
2 Assemble the Top Pinion Bearing (9) to the Pinion, ensuring that
the recess openings are facing away from the gear form, then
assemble items (8), (17) and (18).
3 Lightly grease the Pinion bores in the Body (11) and insert the
Pinion being careful not to damage the 'O' Rings.
4 When the Pinion is in place, install the DURASTRIP Thrust Bear-
ing (5), Thrust Washer (25) and the snap ring (Circlip) (6) into the
narrow groove at the top of the Pinion (ensuring the snap ring fits
properly into the groove).
5 Only open the snap ring (Circlip) enough to just clear the Pinion
diameter as opening too far will damage the snap ring. If damage
occurs replace with a new part.
IMPORTANT: The snap ring (Circlip) has one side with bevelled
edges which must go DOWN onto the Thrust Washer (25); the
square edge side must face UPWARDS.
10.2 Alignment of pinion for correct piston assembly.
Standard rotation is clockwise with the Pistons moving towards each
other (When viewed from above the slot at the top of the Pinion, see
Fig. 6).
4
Extractor rods
4
Extractor
plates
5
4
5
7
4
Hold nuts
Adjusting nut
Hytork XL
6
6
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