Pontiac FIREBIRD 1972 Service Manual page 1173

9-20 1972 PONTIAC SERVICE MANUAL
control orifice (2). This lower pressure is transmitted to
external circuit through the steering gear allows oil to
the bottom end of the pump control valve (9) via orifice
recirculate through the entire system.
(1 1) and passage (8), resulting in a pressure unbalance on
the valve itself. The flow control valve moves away from
the discharge fitting, but due to the force of the flow
MODERATE TO HIGH SPEED OPERATION
control spring (10) the valve remains closed to the bypass
hole (5). The oil pressure does not build up high enough When operating at moderate to high speed (Fig. 9-1 8), it
to cause the pressure relief valve to actuate, because the
is desirable to limit the temperature rise of the oil. This is
. . . . . . . . .
INTERNAL L o w PRESSURE
o r
LOW PRESSURE DISCHARGE OIL
RESERVOIR AND RETURN OIL
RING ROTOR LEAKAGE OIL
SUPERCHARGE OIL
Fig. 9-18 Oil Flow
-
Moderate to High Speed (Flow Controlling)