23 - 4
Typical Ram
Dismantling and Assembly
The numerical sequence shown on the illustration is intended
as a guide to dismantling.
For assembly the sequence should be reversed.
When Dismantling
Discard all seals and 'O' rings.
!!
WARNING
If air or hydraulic pressure is used to force out the piston
assembly ensure that the end cap is fitted securely.
Severe injury can be caused by a rod being released
suddenly.
HYD 1-3
When Assembling
Thoroughly clean the threads of piston head 6, piston rod 2,
end cap 1 and cylinder with a wire brush. Use new seals and
'O' rings throughout. Ensure that all threads are free from
grease, hydraulic oil and old locking fluids using JCB
Cleaner/Degreaser. Allow solvent to dry for 15 minutes
before applying JCB Activator.
Ensure that lubricants used during assembly do not come
into contact with the locking fluids.
When fitting seal 4A, ensure that internal seal 4B remains
seated squarely in its groove and not twisted.
Before fitting the end cap 1 onto the piston rod 2, wrap tape
around the piston rod threads to protect the gland seal from
damage and the threads from oil and grease.
Apply JCB Activator to the threads of the piston head 6.
Allow to dry for 15 minutes before bringing into contact with
JCB Threadlocker.
Note: Threadlocker and Activator must not contact seals,
bearing rings or 'O' rings.
Apply JCB Threadlocker & Sealer (High Strength) to all
threads of the piston rod. Fit and torque-tighten the piston
head.
Taking care to retain the end cap 1 at the further end of the
piston rod from the cylinder, coat the thread of the cylinder
with JCB Activator. Next apply JCB Threadlocker to the
thread of the end cap. Wait 15 minutes before bringing the
two together and then torque-tighten the end cap into the
cylinder.
Note: If hydraulic oil contacts uncured Threadlocker, a
weakening of the bond will result. Cure times vary according
to the ambient temperature. Allow approximately 1 hour at 20
°C between assembly and filling the ram with oil.
Note: When fitting cylinder and piston eye bushes 10, ensure
that the split in the bush is set at 90° to the longitudinal
centreline of the cylinder.
Torque Settings
Item Nm kgfm lbf ft
Lift ram 1 678 69 500
6 405 41 300
Compensating ram 1 450 46 332
6 300 31 221
Crowd ram 1 678 69 500
6 405 41 300
Note: Cold weather operation. When operating in conditions
which are consistently below freezing, it is recommended
that the rams are operated slowly to their full extent before
commencing normal working.
Section E
Hydraulics
9803/8500
Section E
23 - 4
Issue 4*
Rams
*
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