jcb JS300 Service Manual page 712

Tracked excavators - tier 4i isuzu engine

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Section E - Hydraulics

Hydraulic System

Hydraulic Operation and Schematics

Auxiliary Circuit

K Fig 15. ( T E-52)

For Schematic,

An auxiliary circuit gives a bi-directional flow to the

equipment being used:

The Option pedal 53 can be selected back or forward

depending on the direction the operator wants the

equipment to move.

Pilot pressure from the pedal 53 selects the auxiliary spool

via port pa2.

The hammer/auxiliary solenoid B is energised in aux mode

which does not allow pilot pressure to select the hammer/

auxiliary changeover valve 27.

Flow from pump 2 crosses the selected hammer spool and

exits the valve block at port A2.

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