Allied H12E, Service Manual

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General
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Counterbalance Relief Manifold (See Fig. 1-15)
The counterbalance relief (CBR) manifold houses the
counterbalance valve and the high pressure relief valves.
The counterbalance valve is a load holding valve that
blocks return oil fl ow from the motor in the event supply
pressure drops below a set point in
LINE-OUT mode. The
counterbalance valve allows oil to free fl ow in the LINE-
IN mode through a check valve. The high pressure relief
valves act as an overload relief when supply pressure
exceeds the setting of the valve.
Figure 1-15 Counterbalance Relief Manifold
Port A1
Port B
Relief Valve
Port A
Port B
Relief Valve
Counterbalance Valve
Port ACCUM B
Port TS
Port A1
Port B
Port ACCUM A