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THEORY OF OPERATION<br />
BACKHOES<br />
BACKHOE HYDRAULIC SYSTEM<br />
NOTE: Model 48 backhoe swing system shown.<br />
Bucket<br />
Dipperstick<br />
Left or Right<br />
Stabilizer<br />
Boom<br />
LH<br />
Swing<br />
RH<br />
Swing<br />
(Open Center Only)<br />
Power Beyond<br />
Circuit Relief<br />
Restrictor<br />
Orifice<br />
Anti-Cavitation<br />
Check Valve<br />
Load Check<br />
Valve<br />
In<br />
Restrictor<br />
Orifice<br />
Main System Relief<br />
Out<br />
Anti-Cavitation<br />
Check Valve<br />
Circuit Relief<br />
LH<br />
Swing<br />
RH<br />
Swing<br />
Model 47 Backhoe<br />
Swing System<br />
3-8 6/22/99
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