Auxiliary Relief Valves Dismantling And Assembly - jcb 214e Service Manual

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Dismantling and Assembly

Auxiliary Relief Valves

Eight A.R.V's are fitted at positions 4H to 4Q. These are

identical in design but have various pressure settings, refer

to Technical Data.

Note: Valve 4Q is only fitted to machines equipped with a

Powerbreaker.

The numerical sequence shown on the illustration is intended

as a guide to dismantling.

For assembly the sequence should be reversed.

Dismantle sub-assembly 14 from item 1 using a special tool

(see Service Tools). The special spanner locates in cross

Dismantle sub-assembly 14 into its component parts.

Make sure that small drilling A is not blocked.

Discard old and worn O-rings and back-up rings.

Renew all O-rings and back-up rings.

Lubricate O-rings and back-up rings with JCB Hydraulic

Fit back-up ring 13 on the upper side of 'O' ring 12 as shown

in the inset.

Fit flat face of sleeve 9 against shoulder of poppet 10.

Torque tighten item 14 using the special tool (see Service

Tools), until its shoulder seats firmly against item 1.

Pressure test the relief valves, refer to Service Procedures,

Excavator Valve - Pressure Testing.

Torque Settings

Excavator Valve

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A.R.V. Position Key

Note: The bucket rod side A.R.V. is only fitted to machines

equipped with a Powerbreaker.

Control Layout

4cx 3cx 214 215 217