OPERATING
BETTCHER
AIRSHIRZ
®
INSTRUCTIONS
INDUSTRIES, INC. Rev. September 24, 2016
Page 69
9.4.13.3 Dual Power Cylinder Disassembly and Repair (See Fig. #64) (Continued)
Thoroughly clean the outside of the power cylinder. Be sure to work over a table to catch loose
parts.
Remove the four (4) screws, flat washers, lockwashers, and hex nuts, holding both halves of the
power cylinder together. Note the location and number of fasteners. Hold the cylinder assembly
with one hand, and remove the rear cylinder with a gentle twisting motion with the other.
Clean the rod and make sure it is free of dirt and burrs. Check that there are no sharp edges at the
cross-hole; otherwise the seals may be damaged. Apply a thin coat of Bettcher
®
Max-Z-Lube to
the surface of the rod. Hold the rear piston and carefully pull the front cylinder off the piston rod,
using a twisting motion to prevent damage to the lip seal.
Put a clevis pin or other rod of 1/8 inch (3mm) diameter into the rod end bearing to act as a handle.
Remove the piston screw, and then remove the rear piston. Lubricate the piston rod, and pull it out
through the center plate.
Examine all seals:
•
O-rings with a wide flat band, pinch marks, cracks or nicks, should be replaced. Remove
defective O-ring. Clean the groove. Apply Bettcher
®
Max-Z-Lube to the new O-ring and
install into groove.
•
The lip seal for the rod should be replaced if air had been leaking from the rod, if it was
removed, or if the inner lip appears uneven or worn. Use tweezers or small wire to pry lip
seal inward and pull it out from the inside of the cylinder. Clean the groove between the
cylinder flange and bearing (refer to figure #65). Apply Bettcher
®
Max-Z-Lube all over the
new seal and squeeze it into the front cylinder housing from the same side it was removed.
Use a blunt object to coax it into position. Be sure that the lip is facing toward the inside
cylinder as shown.
•
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 cylinder flange and the edge
of the seal to remove dirt and grease. Use a small screwdriver, or pair of tweezers, to dig
into the old seal and pry it out of its groove and into the center of the hole. Remove the 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 protection facing outward.
Use a screwdriver blade to
push 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 the rod into the cylinder body from inside. Confirm that the wiper is
seated properly into the groove as the rod extends into it.
Do not use a damaged rod, as it
may destroy the wiper.
Remove the rod.
