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Revision B December 2013
www.highwayguardrail.com
34
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Note:
If it is possible to stroke the cylinder after repairing, turn gland nut until it
contacts the V-rings and stroke the cylinder to allow the rings to seat and align, then re-
tighten as described above.
B. Double-acting cylinder
1. Follow the exact same procedures as 1, 2, & 3 above.
Note:
On 50.8 & 63.5 mm [2'' and 2-1/2''] bore cylinders there is a retaining ring
assembled just below the threaded area of the tube assembly. This ring must be removed
in order to remove the rod assembly.
2. Double-acting cylinders have two piston cups on the internal threaded end of the
chrome rod. If these cups are worn, they must be replaced to ensure a proper seal.
It is also advisable to check the piston O-ring and the stuffing box O-ring and replace
if signs of wear exist.
Note:
When replacing pistons on the rod, have the O-ring
well-greased
and screw the
piston past the threads to prevent damage to the new O-ring.
3.
Replace the V-rings, spreader, and gland nut as described in 5, 6, 7, & 8, above.
