Regulator - Hitachi ZW180 Technical Manual

REGULATOR

The regulator controls flow of the main pump by
receiving various kinds of signal pressure.
The regulator includes spring (1), sleeve 1 (2), sleeve 2
(7), spool 1 (3), spool 2 (6), piston (4), load piston (5),
inner spring (8) and outer spring (9).
The regulator opens and closes the circuit to servo
piston 1 (10) by receiving various kinds of signal
pressure, and controls delivery flow of the pump by
changing the displacement angle of swash plate (11).
NOTE: Primary pilot pressure (Pg) is always
applied to servo piston 2 (12).
COMPONENT OPERATION / Pump Device
3
Pi1
ST
Pd1
5 7
10
Pd1 - Own Pump Pressure
ST - Pump Torque Control
Pressure
T - Returning to Hydraulic
Oil Tank
T3-1-4
2
Air
T
Vent
T
6
Increase
Decrease
Displacement Angle
Pi1 - Pump Control
Pressure 1
Pi2 - Pump Control
Pressure 2
Pg - Primary Pilot
Pressure
(From Pilot Pump)
1
4
Pi2
Pg
T
8, 9
12
T4GB-03-01-006