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75 - 5

Assembly

Note: See Torque Setting Figures.

Clean each part in a suitable solvent and dry using

compressed air.

Inspect all parts and renew as required.

Care must be taken not to let dust or dirt adhere to parts

after cleaning and that parts do not become dented,

scratched or damaged.

Fit new 'O'-rings, and seals when assembling together with

a new back up ring.

Take care to install the back up ring in the proper position.

Apply grease or hydraulic oil to all new oil seals and 'O'-

rings, and clean hydraulic fluid to all sliding parts before

installation.

1 Cylinder head assembly.

a Assemble the bushing A using a jig B and

press C.

b Assemble the wiper ring D using a jig E and press

c Assemble the back up ring F and U-ring G.

2 Buffer ring assembly.

Note: After installing the square ring K in the groove, bend

the buffer ring FF into a U-shape J and set it in the groove

H, then press on the outer circumference of the ring to fit it

into place. Bending the ring in too small a radius causes

wrinkles which remain in the ring after installation. Keep the

bending radius at 6 mm or greater. Make sure there are no

wrinkles in the ring after installation.

Note: Be careful to install the seal in the proper direction.

Installing it backwards causes extremely high pressure to

build up between it and the U-ring and could cause

deformation of the cylinder head.

a Install the snap ring M to prevent the bushing A

from coming off.

Section E Hydraulics

9803/6410

Section E

75 - 5

Issue 1

Hydraulic Rams

jcb JS130 User Manual

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