JCB Ram Sealing Procedure (continued)
Fit new piston head seals:
6 Use a blunt instrument (892/01027) shown at F, lever
the inner seal G into the piston head seal groove, do not
let the seal twist. There are identification marks on the
outer diameter of the seal, make sure the marks are
visible and the seal is free to rotate, if not remove the
seal and refit
7 Fit outer seal H using the same procedure as step 6.
Check the external grooves are visible.
8 Ensure O ring is fitted into the internal seal groove on
the piston head. Screw the piston head onto the thread
of the piston rod, refer to the relevant section for torque
figure and completion of ram assembly.
9 Fit the piston head retaining dowel, see ram dismantling
and assembling relevant section
10 Fit wear rings J and K. Rotate the wear rings so that the
piston retention dowel is covered by the wear ring, NOT
as shown at L.
Fit the piston rod and head assembly into the cylinder:
11 Insert the piston/rod assembly into the cylinder. Align
the rod and head assembly until parallel with the
cylinder then push the assembly into the cylinder.
12 Fit the end cap, refer to the relevant section for torque
figure and completion of ram assembly.
89 - 2
Section E Hydraulics
9803/3280
Section E
89 - 2
Issue 1
Hydraulic Rams
338470
F
G
338480
H
338490
L
K
J
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