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4. Seal Replacement
Inspect the seal housing grooves within the
ram. Using either a clean cloth or compressed
air, remove all dirt and debris from the ram and
body. It is very important that all dust and debris
be removed from the seal/AER as failure to do
so may result in seal failure.
Fit the AER’s to the seal, the tapered surface
of the AER must face the taper of the seal as
shown below. This applies to both outer and
inner AER’s.
FIGURE 20 - AER LOCATION
Install the seal assembly into the ram, pressing
down firmly until the seal fully enters the ram
seal housing.
Engage the seal retaining clip by pushing down
around the periphery using a blunt edged dolly
in the position shown below. A ‘click’ will be
sensed when the seal fully engages.
FIGURE 21 - ENGAGING THE SEAL
When there are no gaps between the ram, AER
and seal the assembly is correct, see below.
FIGURE 21A - INCORRECT AER ASSEMBLY
FIGURE 21B - CORRECT AER ASSEMBLY
Lubricate the seal and tensioner bores with
silicone grease or clean hydraulic oil in
preparation of installing the ram.
Push the ram into the body bore ensuring that
the seal does not become nipped. The outer
seal will be the first to enter and can be used as
a guide to square up the ram prior to entering
the inner seal. Should difficulty be encountered
in entering seals, a slight rotation of the ram
whilst pushing the ram into the body may aid
the installation.
5. Coupler Seals
5a 1/4” BSP Fittings
A simple sealing arrangement exists between
the HydraMax® tensioner body and the coupler.
The seal is a 1500 Bar [21,750 psi] rated Bonded
Seal; it is located inside a counterbore on the
tensioner body behind the coupler. Should the
seal leak or become damaged then it should be
replaced as follows.
Unscrew the male quick-disconnect coupler.
Note:
A 1/4” BSP threaded adaptor is fitted
into the male quick-disconnect coupler. Under
normal circumstances this will remain an
integral part of the coupler and should not be
removed. However, should the adaptor and
coupler become separated or unscrewed, then
the adaptor must be reassembled into the
coupler and re-tightened. The 1/4” BSP adaptor
must never be installed into the tensioner body
before the coupler and seals are attached.
Follow the procedure below if the adaptor has
separated from the coupler.
