Aerotech ACS Hardware Manual page 49

ACS Hardware Manual
D A N G E R : The collet cover is under tension from internal springs. Removing the collet cover
screws incorrectly can result in personal harm and damage to the equipment.
Step 5: Refer to Figure
cannot be removed at once, as the cap is under tension from several springs and will be damaged or
cause bodily harm if removed without caution.
Step 6: Obtain four M4 x 0.7 x 12 mm long socket head cap screws and thread them into the holes where
the previous screws were removed. Tighten each one until it bottoms out in its hole.
Step 7: Loosen the four remaining collet cover screws, 1/4 turn at a time. Loosen the screws in a cross
pattern (i.e., loosen screw number 2, then screw number 6, then screw number 8, then screw
number 4, then return to screw number 2). Repeat this process until the longer screws are
supporting the tension of the springs entirely. It is then safe to remove the remaining collet cover
screws completely.
Step 8: Using the same method as in Step 7, remove the longer screws until the spring tension is
completely relieved.
Step 9: Carefully slide the collet piston assembly out from its housing. Use caution not to tilt the piston
assembly in its housing as this could cause damage to the housing, seals, or piston.
Step 10: It is now safe to remove the collet cover retaining ring. This can be done with a flat-head screwdriver
or a pair of needle nosed pliers.
Step 11: Remove the collet cover and the springs from the collet piston.
Step 12: There are two seals on the piston itself. One is an external seal that seals the piston against its
housing; the other is an internal seal that seals the piston against the collet sleeve. To remove the
seals, carefully pry them out of their housings with a small screwdriver or pick. Use caution not to
scratch the surface of the piston.
Step 13: Thoroughly clean seal mounting surfaces, the chamfers, and all surfaces that the new seals may
come in contact with. Even small particles or debris can damage the seals during installation.
Step 14: Lubricate the new seals with o-ring lubricant as specified in
Step 15: Press the new seals over the chamfer and into their respective grooves. Be sure to align the seals
such that the open end (when looking at a cross section) is facing away from the collet, as shown in
Figure 4-3. The direction of the seal is extremely important in sealing the piston. Make sure that the
seals sit into their mounting grooves by running a fingernail around the edge. If the seal is tilted or
twisted slightly its function will be severely compromised.
Step 16: Reinstall the springs.
Step 17: Place the collet cover over the piston and reinstall the collet cover retaining ring.
Step 18: Reinstall the collet piston assembly into its housing. There are chamfers to help guide the piston into
place, but use caution not to twist or damage the seals. It is recommended that a small amount of o-
ring lubricant be used.
www.aerotech.com
4-1. Remove every other collet cover screw (i.e., screws 1, 3, 5, and 7). All screws
Chapter 4
Maintenance
Section 4.2.
49