TM 5-2410-240-23-1
0011
IMPLEMENT HYDRAULIC SYSTEM CONTINUED
Implement Pump Operation
00011
1. Pressure and Flow Compensator Valve
The pressure and flow compensator valve (Figure 3, Item 9) bolts to the top of the implement pump (Figure 3, Item
1). The pressure and flow compensator valve compensates for pressure and flow variations in the implement
hydraulic system in order to meet system demands.
The flow compensator (margin) spool (Figure 3, Item 10) regulates pump output flow in response to load sensing
(signal) oil pressure (Figure 3, Item 7), boost pressure, and supply pressure from the pump outlet (Figure 3,
Item 2). The load sensing (signal) oil is received through the load sensing line for the implement pump (Figure 3,
Item 1).
The flow supplied by the implement pump (Figure 3, Item 1) is the amount required in order to keep the supply
pressure above load sensing (signal) oil pressure (Figure 3, Item 7) and boost pressure. The difference between
load sensing (signal) oil pressure from the main hydraulic control valve and the supply pressure from pump outlet
(Figure 3, Item 2) is called the margin pressure.
Flow compensator (margin) spool (Figure 3, Item 10) controls the margin pressure.
Margin pressure is equal to the spring force value of margin spring (Figure 3, Item 6).
Margin pressure is adjustable by turning adjusting screw (Figure 3, Item 5).
Load sensing oil relief valve (Figure 3, Item 8) and margin pressure control maximum system pressure. The
pressure compensator spool (Figure 3, Item 11) provides a backup to limit maximum system pressure if the load
sensing oil relief valve fails. The pressure and flow compensator valve (Figure 3, Item 9) has an orifice (Figure 3,
Item 4) in the load sensing oil passage (Figure 3, Item 3) to the actuator piston. The orifice regulates the response
rate of the actuator piston by creating a consistent leak path.
When the load sensing oil relief valve (Figure 3, Item 8) is operating correctly, it controls the maximum system
pressure. Maximum system pressure should be the pressure of the load sensing oil relief valve plus the margin
pressure. If the load sensing oil relief valve is not adjusted correctly, the pressure compensator acts as a backup.
Figure 3. Pressure and Flow Compensator Valve.
0011
