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Hydraulics

9803/3280 Issue 1

8 - 1 8 - 1

Circuit Descriptions

Section E Section E

Excavator Valve

Component Key: (JCB 'X' Control Pattern)

A Inlet

B Parallel Gallery

C Load Hold Check Valves

4A Slew Spool

4B Boom Spool

4C Stabiliser Spool

4D Stabiliser Spool

4E Dipper Spool

4F Bucket Spool

Note: Machines with ISO control pattern have the boom and

dipper spools interchanged.

Manual Control - Neutral Circuit

Oil from the loader valve enters the excavator valve at A

and flows through the neutral gallery and around the waists

of the solid spools. It also fills the parallel gallery B but is not

at a high enough pressure to open the load hold check

valves C.

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jcb 215 Service Manual

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