Main Pump - Hitachi ZW180 Technical Manual

MAIN PUMP

The main pump supplies pressure oil to operate the
cylinders and other hydraulic components. The pump
is provided with a regulator to control the delivery flow.
Shaft (5) is connected to cylinder block (1) in the pump.
Shaft (5) and cylinder block (1) rotate together.
1 - Cylinder Block
2 - Plunger
COMPONENT OPERATION / Pump Device
1
3 - Servo Piston 1 (2 Used)
4 - Swash Plate
When cylinder block
reciprocates inside the cylinder block due to the tilting
of swash plate (4), and delivers the hydraulic oil.
The main pump delivery flow is controlled by changing
the displacement angle of swash plate (4) with servo
piston 1 (3) and servo piston 2 (6), which increase or
decrease the stroke of plunger (2).
2 3 4
6
8
5 - Shaft
6 - Servo Piston 2
T3-1-2
(1) rotates, plungers (2)
5
7
7 - Feedback Lever
8 - Link
T4GB-03-01-002