CYLINDER SHAFT
For dents, deep scratches, or damaged chrome plating. File any sharp edges on ends of
shaft to protect the seals upon reassembly. Always protect the shaft finish when clamping
in a vice or when welding against weld splatter.
PISTON RINGS
For cracks or other damage. Particularly check the interlocking ends that they are not
missing or broken.
PISTON SEALS
For signs of severe damage. Do not remove unless replacement is necessary.
PISTON & HEAD GLAND
It is not normally necessary to replace the piston, piston rings, or head gland.
HYDRAULIC CYLINDER REASSEMBLY
GENERAL
As cylinder components are reassembled, be certain all rings, seals, spacers, and
setscrews required in one step are in place before proceeding to the next step. See Group
39 of the Parts Manual for a complete listing of cylinder parts.
A teflon ring must be installed before the piston ring or wear ring is installed since the teflon
ring must first be “walked” into the piston ring groove and then into its own groove. Warm
the teflon ring until reasonably flexible and oil the piston ring or wear ring to aid in the
installation.
Most piston ring breakage is due to careless or hasty assembly at this point.
BOOM LIFT CYLINDERS
With the piston, piston rod, head gland, retaining ring, and rod eye reassembled as a unit,
slide the piston into the cylinder bore. Next, insert and seat the head gland. It may be
necessary to drive the head gland into place using a wood block and hammer. In this
event, cover the rod with rags or a rubber tube to prevent damage from a glancing hammer
blow. The retaining ring is then spun in and tightened to secure the head gland. Install
socket head cap screws. The retaining ring should be secured with Loctite Grade 242. Coat
both grooves around the thread ring as well as the bolt heads with a “silstic” type silicon
sealant to keep moisture out.
NOTE: When installing the piston ring nut on the piston rod, torque to 400 ft. lbs
and then secure with setscrew lock. Use Loctite Grade 242 on ring nut and
setscrews.
BOOM EXTENDED CYLINDERS
With the piston, piston rod, head gland, and retaining ring assembled as a unit, slide the
piston into the cylinder bore. Next, insert the head gland. It may be necessary to tap the
RT500
Service / Parts
276 REVISED:
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