35 - 1
Optional Hand Tool Circuit
Description
The oil supply for the optional hand tool circuit is taken from
the excavator valve auxiliary circuit feed lines. When the
auxiliary circuit is selected by the foot pedal, oil is fed via the
Manual Valve 2 to the Flow Regulator Valve 3. Flow
Regulator Spool 3a controls the flow to the hand tool circuit
4, dumping excess oil back to tank via the return line of the
excavator auxiliary circuit. Return oil from the hand tool is
fed directly back to tank. Relief Valve 3b prevents pressure
in the hand tool circuit from rising too far.
Manual Valve 2 is turned off to isolate the hand tool circuit
when the excavator auxiliary circuit is to be used for other
applications.
Component Key
T Tank
1 Excavator Valve Block Auxiliary Lines
2 Manual Valve
3 Flow Regulator Valve
3a Flow Regulator Spool
3b Relief Valve
4 Hand Tool Connection
5 Return Line from Brake Valve
Section E Hydraulics
9803/8550
Section E
35 - 1
Issue 1
Schematic Hydraulic Circuit
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