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Section H
32 - 2
Rams
Dismantling and Assembly
The numerical sequence shown on the illustration is
intended as a guide to dismantling.
For assembly the sequence should be reversed.
Dismantling
1
Fix the ram assembly on a locally manufactured
strip/rebuild bench as shown at A.
2
Remove both end caps, using a special spanner (refer
to Service Tools). Pull the piston rod assembly from
the cylinder.
Note 1: DO NOT allow the piston rod to come into contact
with the cylinder bore. The cylinder bore may be damaged
by careless dismantling.
3
Position the piston rod assembly on a bench in place of
the ram cylinder. Remove the seal and wear rings from
the piston head.
Note 2: The piston head cannot be removed from the rod. If
there is damage to the rod or piston head, replace the
complete assembly.
Carefully inspect the bore of the cylinder and the piston
4
rod outer diameter for scoring, nicks and burrs. If such
damage is visible the components must be renewed.
Note 3: If burrs are evident on the ends of the piston rod at
positions C or D remove by careful filing.
Both end cap assemblies are the same, dismantle as
follows:
5
Remove the 'O' ring 5, end cap seal 6 and wiper seal 7.
6
The bearing bush 8 can be renewed if necessary.
However, time will be saved if a complete end cap and
bush assembly is obtained.
9803/3280
Power Track Rod
Purchased from www.WorkshopManuals.co.uk
Steering
Assembly
Clean the threads of the end caps and cylinder using a
1
wire brush.
2
Use JCB Cleaner & Degreaser to ensure that all
threads are free from grease, hydraulic oil and sealant.
Allow 15 minutes for solvent to dry before applying
JCB Threadlocker and Sealer (High Strength).
Ensure that lubricants used during assembly do not
come into contact with the JCB Threadlocker and
Sealer (High Strength).
3
Refer to Section E Rams - JCB Ram Sealing
Procedure for the correct method of fitting seals to the
end cap and piston head.
4
Clamp the cylinder vertically and lower the piston rod
assembly in from the top, as shown at B. Take care not
to allow the piston rod to come into contact with the
cylinder bore. Be sure to engage the piston head new
wear rings and seal carefully into the cylinder. If the
piston head wear rings or seal are damaged during this
stage, they must be renewed.
5
Apply JCB Activator to threads of the end caps and
cylinder. Allow Activator to dry for 15 minutes before
bringing into contact with the JCB Threadlocker and
Sealer (High Strength).
Note 4: Neither the JCB Threadlocker and Sealer (High
Strength) nor Activator must be allowed to contact seals,
bearing rings or 'O' rings.
6
Apply JCB Threadlocker and Sealer (High Strength) to
threads of the ends caps, fit new 'O' ring 5.
7
Ensure that there are no burrs at the ends of the piston
rod, see Dismantling - Note 3:
8
Fit an end cap over the piston rod. Apply light hand
pressure to the cap to engage the gland seal on the
piston rod. DO NOT use excessive force. Screw on the
first end cap and then fix the assembly on the
strip/rebuild bench as shown at A. Fit the remaining
cap and then torque tighten both caps.
Note 5: If hydraulic oil contacts the uncured JCB
Threadlocker and Sealer (High Strength) a weakening of the
bond will result. Cure times vary according to the ambient
temperature. Allow a minimum of 2 hours between
assembly and filling the ram with oil.
Torque Settings
Item
Nm
kgf m
678
69.2
1
Note 6: Cold weather operation. When operating in
conditions which are consistently below freezing, it is
recommended that the track rod is operated slowly to its full
extent in both directions before commencing normal
working.
Section H
32 - 2
lbf ft
500
Issue 1
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