HUSCO HYDRAULIC CIRCUIT 750,760,860
BACKHOE VALVE
GENERAL DESCRIPTION. (NEUTRAL FLOW)
Oil is drawn from the Hydraulic Reservoir through a 125 Micron Suction Strainer
into the Tandem Gear Type Pumps.
Oil from the inner Pump flows to the Steering Flow Priority Valve
Mounted on the Chassis. If the closed centre Steering Orbitrol Unit is in neutral the
oil is automatically directed to the Loader Control Valve. As oil enters the control
Valve the flow is restricted by a bypass compensating Spool which is in the closed
position, at this point the pressure begins to rise & opens the Spool against a 20 Bar
rated spring allowing the oil to enter the Block.
The open centre Loader Control Valve is a three spool monobloc which supplies oil
to the Loader Beam / Bucket & 7 in 1 Bucket (If fitted). On machines fitted with
standard Loader Buckets the ports of the Center Spool are blanked off.
If all the Spools are in the neutral position the oil flows through the open centre of
the Loader Valve to the Backhoe Control Valve.
Oil from the outer Pump flows through to the new Unloader Valve mounted on the
Chassis where it joins the flow from the outer pump to the Loader Control Valve.
The 7 Spool Backhoe Monobloc Control Valve is of the closed centre type. If all
Spools are in the neutral position oil passes through a parallel Gallery Via a return
line 6 Bar rated check valve through the Return Line Filter & Cooler back to Tank.
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