Remove the remaining hydrolock seal and
guide lock ring from the outside of the piston and the
O-ring and two backup rings from the inside of the
Do not damage the O-rings during
piston. Remove the rod spacer.
installation of the holding valve. If the
holding valve turns freely then gets hard
Remove the cylinder head from the rod.
to turn, then easy to turn; remove the
holding valve and check the O-rings.
Remove the O-ring and backup ring from the
They have probably been damaged by a
outside of the head and the wear ring, buffer seal,
sharp edge of a port.
deep Z rod seal, and wiper ring from the inside of the
If necessary, remove the holding valve from
The holding valve should turn by hand
the port block.
until compression of the O-rings begins.
Carefully install the holding valve into the port
block until fully seated.
Clean all parts with solvent and dry with
compressed air. Inspect all parts for serviceability.
When installing new seals and rings,
avoid stretching seals or scratching the
Before installing new seals and rings,
grooved or gland surfaces.
clean all surfaces and carefully remove
burrs and nicks.
excessive wear or damage should be
Lubricate new seals and rings with clean
Stone out minor blemishes and polish with a
fine crocus cloth.
Install the wear ring into the head
Clean with solvent and dry with compressed
air any parts that have been stoned and polished.
Inspect the barrel carefully for scoring.
Steps 1, 2, 3, and 4 are used only if the
holding valve has been removed.
Check the inside of the port block for any
sharp edges or burrs and remove as necessary with
Install new O-rings onto the holding valve, refer
to Figure 2-8-22.
Lubricate the holding valve and O-rings with
clean hydraulic oil.