Emerson Hytork XL26 Installation, Operation & Maintenance Instructions Manual page 6

Hytork XL
10.3 Piston assembly
10.3.1 Clockwise rotation
(Pistons moving inwards, Fig. 6).
Piston assembly for
"Standard" operation
Pinion dot
One body dot for
standard mode
Fig. 6 Pinion alignment
6 Align the Pinion by lining up the center of the NAMUR slot in the
top of the Pinion with the single dot on the Body. The top of the
Pinion is marked with a single identification dot to indicate the
correct orientation of the stop faces.
7 Lightly grease all Piston grooves, gear form and Piston 'O' Rings
(4) and fit the 'O' Ring (4) and Wear Ring (3) to the Piston.
8 Fit the Bearing Block (10) to the back of the Piston.
9 Grease the Actuator body bore.
10 Insert the Pistons into the bore, ensuring the piston racks line
up with the pinion gear. (The part number in the front face of the
Piston must be lined up parallel to the Pinion).
11 Push both Pistons together until they are both in contact with the
Pinion, so that when the Pinion is rotated clockwise the Pistons
are drawn together. When the Pistons are together and the racks
are correctly engaged with the Pinion, the top Pinion drive flats
should be at right angles to the axis of the Body.
10.3.2 Counter-Clockwise rotation (Pistons moving inwards,
Fig. 7).
12 Align the NAMUR slot in the top of the Pinion with the two dots
on the Body and assemble the pistons so that the Pinion rotates
anti-clockwise as the Pistons are drawn together.
10.4 Travel stop assembly
(See Fig. 1).
13 With the Pistons together, screw in the CLOSING (cast identity
number 2) Travel Stop (22), complete with Locking Nut (24) and
Thread Seal (23), until it comes into contact with the Pinion stop
face.
14 Rotate the Pinion through 90ø only, driving the Pistons apart and
screw in the OPENING (cast identity number 1) Travel Stop (22),
complete with Locking Nut and Thread Seal, until it comes into
contact with the pinion stop face.
For individual position requirements see chapter 4.
10.5 End cap assembly on double acting actuators.
15 Install the SAFEKEY 'O' Ring seals (12) to the SAFEKEY heads
(13).
16 Lightly grease the End Cap 'O' rings (2), the End Cap grooves
and the ends of the Body bore.
17 Taking one of the End Caps install its 'O' Ring and insert it into
the Body.
Page 6
Installation Operation & Maintenance Instructions
Piston assembly for
"Reverse" operation
Two body dots
for reverse
mode
Pinion dot
18 Holding the SAFEKEY close to the entry hole (cast identity letter
C or D) to prevent kinking, insert the SAFEKEY into the hole and
gently push into place.
19 With the SAFEKEY Head in contact with the Body, tighten with a
screw driver to gently compress the 'O' Ring and create a pres-
sure seal.
20 Repeat the operation for the other End Cap. With the Pistons
together, mount the Position Indicator (7) to the top of the Pinion.
10.6 Spring Return Actuators
10.6.1 Spring set adjustments
The actual selection of the correct spring set can be done by either
referring to the torque charts given in the literature on Spring Return
Actuators or by consulting your local HYTORK representative. After
selecting the appropriate spring set arrange the springs as indicated
bellow.
Table 4 Spring Rating Chart
Spring set Side of actuator
Left
S40
Right
Left
S50
Right
Left
S60
Right
Left
S70
Right
Left
S80
Right
Left
S90
Right
Left
S1C
Right
Spring Colour Coding
S20 Inner = Green
S20 Outer = Pink
S30 Outer = Brown
10.6.2 Installing the Springs.
1 - For XL 1127 to XL4581 place the Retractor plate on top of the
piston.
2 Insert the Springs (26/27) into the face of the Piston and then the
End Cap onto the Springs.
3 Pass the correct HYTORK Retractor Rod through the End Cap
(Fig.6) and screw it into
- For XL 26 to XL681 the Pistons (20)
- For XL 1127 to XL4581 the Retractor plate.
4 Line up the End Cap so that the safety symbol is correctly posi-
tioned for easy reading.
5 Prevent the "hold-nuts " to rotate by one wrench. Use another
wrench, to screw the adjusting nut on the HYTORK Retractor
Rod in until the End Cap is completely engaged in the Body.
6 It will be necessary to push the End Cap into the Body to over-
come the 'O' Ring compression.
7 When the End Caps are in place and the SAFEKEYS fitted
correctly, remove the HYTORK Retractor Rods and replace the
Sealing Bolts (28) and seals (29).
MAC050515 EN Rev. C
May 2016
Outer Inner
S20
S20
S30
S20
S30
S30
S20 S20
S30
S20 S20
S20 S20
S30 S20
S20 S20
S30 S20
S30 S20