OPERATING
BETTCHER
AIRSHIRZ
®
INSTRUCTIONS
INDUSTRIES, INC. Rev. September 24, 2016
Page 66
9.4.13.1 Single Power Cylinder Disassembly & Repair (Continued)
•
The wiper should be replaced if it shows any signs of wear. A new wiper has a sharp front
edge where it contacts the rod. Wear produces a widening band of contact at this edge.
Run the blade of a screwdriver around the groove between the base and the edge of the seal
to remove dirt and grease. Use a small screwdriver or tweezers to dig into the old seal and
pry it out of its groove and into the center of the hole. Remove old seal and wipe groove
clean. Apply Bettcher
®
Max-Z-Lube all over the new wiper and angle it into the groove
With the Lip Projection Facing Outward
. Use the blade of the screwdriver to tap the flat
face of the wiper down until it expands into the groove. Fill the region behind the wiper lip
with Bettcher
®
Max-Z-Lube. Apply Bettcher
®
Max-Z-Lube to rod surface and carefully
insert rod into base from inside. Confirm that wiper is seated properly in groove as rod
extends into it.
Do Not
Use a Damaged Rod As It May Destroy the Wiper
. Remove the
rod.
The rod bearing should be replaced if there is excessive side play in the rod, or if abrasive particles
have become embedded. The wiper and lip seal should also be replaced at this time.
Remove the wiper (per above). Use a screwdriver blade entering the base from the inside to push
the bearing out from the rear. Hand force is usually adequate.
Be Careful Not to Gouge the Bore
of the Base
. Remove the lip seal.
Wipe the bore clean and apply a film Bettcher
®
Max-Z-Lube to the bore and to a new lip seal.
Install the lip seal from the front with the lip facing the inside until it is fully down. Set the
bearing squarely over the bore and, using a support peg of slightly less than 1/2 inch (12.7 mm)
diameter, press the bearing until the outer edge is flush with the rear surface of the wiper groove
.239 inch (6.07 mm) from the surface of the base as shown in Figure #63).
Do
Not Over Press as
This Will Damage the Lip Seal
. Install a new wiper (per instructions above).
The wear strip should be replaced if its thickness is worn unevenly, or if the piston shows signs of
having worn against the power cylinder wall.
The rod should be replaced if its surface has become rough, if the coating has worn off, or if there
are any scratches or dings on the portion that slides past the wiper. Use a 1/8 inch (3mm) diameter
rod or a clevis pin inserted into the rod end bearing to act as a handle. Use a Phillips screwdriver
to remove the screw at the top of the piston.
