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Section E
87 - 2
Dismantling and Assembly
- Slew Ram
Dismantling
The numerical sequence shown on the illustration is intended
as a guide to dismantling.
For assembly the sequence should be reversed.
Place ram assembly on a locally manufactured strip/rebuild
bench as shown, or alternatively, hold the ram in a suitable
vice taking care not to damage machined faces.
Remove cylinder 6 using special spanner (see Service
Tools). Tap the cylinder off the piston head assembly using a
suitable drift (e.g. nylon).
Position the piston rod assembly in a vice, use soft jaws and
stand the assembly vertical whilst clamping on the eye end.
Remove seal 8 and wear rings 7 and 9 from piston head.
Extract dowel 10 from the piston head using a metric screw
threaded into the extractor hole.
Remove piston head from rod using special spanner (see
Service Tools).
Remove 'O' ring 12.
Lift the end cap assembly 13 off the piston rod. Remove 'O'
ring 14, rod wiper seal 15 and rod seal 16 from the end cap
assembly. Check the end cap bearing 13A for damage,
scores or nicks.
Item 18 is the metering orifice plate and item 17 its retaining
wire, do not remove these items unless problems with the
metering are suspected.
Ensure that metal components are free from scoring, nicks
and burrs. A damaged rod will impair the life of the seals.
Check the bore of the ram cylinder for damage.
9803/3280
Hydraulics
Hydraulic Rams
S266380
Purchased from www.WorkshopManuals.co.uk
Assembly
Clean threads of piston rod, piston head, end cap and
cylinder using a wire brush. 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).
Refer to JCB Ram Sealing Procedure for the correct
method of fitting seals to the end cap and piston head.
Apply JCB Activator to threads of end cap and cylinder.
Allow Activator to dry for 15 minutes before bringing into
c ont ac t w it h t he JCB Thread loc ker and Sealer (High
Strength).
Note: Neither the JCB Threadlocker and Sealer (High
Strength) nor Activator must be allowed to contact seals,
bearing rings, or 'O' rings.
Fit locking dowel 10 to piston head/rod as follows:
1
Fit 'O' ring 12 into piston head 11.
2
Fit piston head to piston rod and torque tighten to 405
Nm (300 lbf ft).
3
New ram Shaft and piston head fitted.
-
If both are required, the following procedure should
be followed:
a
Drill through piston head into piston rod. Use an
undersized diameter drill first as a guide and then
drill with the correct size diameter drill to suit; refer
to the table for drill diameters and depths.
Remove all swarf and contamination. Insert dowel
b
10 into drilled hole, make sure tapped extractor
hole is to outside.
4
New piston head fitted on a pre-drilled piston rod.
-
Re- drill and dowel BOTH the piston head and
piston rod at 90° from the existing drilled dowel
hole in the piston rod. Follow the procedures
described in step 3.
5
New piston rod fitted to a pre-drilled piston head.
-
Use the pre-drilled hole in the piston head. Care
must be taken not to elongate the existing hole in
the piston head.
a
Use a drill the same diameter as the pre-drilled hole
in the piston head to make a 'centre mark' in the
piston rod. DO NOT drill the piston rod at this
stage.
...........continued
Section E
87 - 2
Issue 1
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