Remove the bridge assembly from the head
assembly. Inspect each sub assembly for any
visible damage/leaks etc.
With the ram fully retracted in the head assembly,
unscrew the quick disconnect couplers.
Replace the seals as described in Section 8.4.
Refit the springs, spring housing and quick
disconnect couplers.
Clean the puller, particularly the thread, and
bridge assembly (if necessary remove the
retaining ring and socket).
Assemble the tensioner onto a suitable bolt
(see Section 6.0) check that the bolt material is
capable of taking the applied load i.e. do not
pressurise to max working pressure if the bolt
is not strong enough to withstand the full load
of the tool. Pressurise for approximately one
minute, a pressure drop of 50 bar is acceptable
during this time.
Having removed the tensioner from the bolt,
coat each sub-assembly in a water repellent
spray such as WD40 or similar.
Replace the dust caps on the quick disconnect
couplers.
8.4 Changing Tensioner Seals
1. Precautions
The following precautions must be taken with
the assembly of the hydraulic seals:
• Avoid sharp edges (cover thread areas)
• Remove all dust, dirt, swarf and foreign
particles.
• Do not use sharp edged tools.
• Lubricate all components before assembly.
Hydraulic seal replacement must only be
carried out should the seals become damaged.
The seals should not be removed during routine
maintenance.
16
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2. Ram
Legend for Figures
1. Seal
2. Ram
3. Anti-Extrusion Ring (AER)
4. Pliers
5. Blunt Edged Dolly
3. Seal Removal
Remove the spring housing retaining screws;
this will allow the spring housing and springs
to be removed.
Note:
As a nominal load is retained in the ram
springs, care must be taken when removing the
final screws, it may be necessary to use some
threaded bar and nuts to gradually release the
spring load.
Fit an open-ended female quick-disconnect
coupler to a tensioner coupler. Remove the two
plastic grub screws located in the ram surface,
fit two appropriate ram extraction bolts and use
them to pull the ram free from the body bore.
To remove the hydraulic seals and Anti-
Extrusion Rings (AER’s):
Using a pair of pliers, grip the sealing lip of the
hydraulic seal and pull the seal away from the
ram. Take care not to damage the edge of the
ram.
FIGURE 19 - REMOVAL OF SEALS
Discard the seal, remove the extraction bolts
and replace the two plastic grub screws.
