Loader Shovel Spool - jcb 214e Service Manual

Backhoe loader

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Loader Valve - Variable Flow

Loader Shovel Spool

The loader shovel spool operates in the same manner as the

auxiliary spool, refer to Auxiliary Spool.

The shovel valve section also houses auxiliary relief valves

(items 30 and 30A).

Under normal operating conditions, with the shovel in the

' carry' position, the mechanical linkage keeps the shovel

level as the arms are raised, to prevent spillage of the load.

If, as illustrated, the shovel is fully tipped when the arms are

being raised, the shovel is unable to tip further, producing

back pressure in the head side of the shovel rams and

cavitation in the rod side.

As the arms continue to rise, the back pressure increases

until it reaches the setting of A.R.V. 30A. This A.R.V. then

opens, allowing the excess back pressure to be dumped to

exhaust and prevent the rams and linkage from being

The rod side A.R.V. 30 senses a higher pressure in the

exhaust gallery than in the service port and therefore opens

to allow exhaust oil to overcome the cavitation.

The shovel service may also be fitted with a 'return to dig'

detent solenoid 12.

Circuit Descriptions

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4cx 3cx 214 215 217