New Holland T8010 Manual page 795

16
1. SIGNAL LINE PRESSURE
2. PUMP CASE DRAIN
3. CONTROL PISTON PRESSURE
4. PISTON PUMP OUTLET PRESSURE
Pressure and Flow Delivery and Compensation Principle
When oil is required in the system, the flow is controlled by the difference in pressure at opposite ends of the
compensator spool.
When a control valve is operated, pressure at the outlet of the piston pump will drop slightly. This will enable the
spring and signal line pressure to shift the flow compensator spool away from the spring end, allowing oil from the
control piston to drain past the spool land to tank.
As the oil drains out of the control piston, the swash plate angle will increase and the pump flow will rise until the
flow demand has been met. The flow from the pump is determined by the size of the orifice in the control valve
which is being operated. This orifice is created by limiting the main valve spool travel within the control valve.
When a control valve is operated, the oil pressure in the circuit being supplied will increase to its operating
pressure. This pressure will be transmitted through the sensing line to the spring end of the compensator spool.
Section 35 - Hydraulic Systems, 3PT - Chapter 2
18
15
4
3
14. OUTLET PORT (NOT SHOWN)
15. FLOW COMPENSATOR SPOOL
16. HIGH PRESSURE COMPENSATOR SPOOL
17. HIGH PRESSURE SPRING
21 19
1
2
35-2-38
17
18. FLOW COMPENSATOR SPOOL
19. HIGH PRESSURE COMPENSATOR SPOOL
21. COMPENSATOR ASSEMBLY
RH02B010