5. The pressure ripples at zero flow and partial flow
shall not exceed ±50 psi (3.5 bar).
6. Case drain flow shall be stable.
Control Option Adjustment Procedures - Remote
Compensator
1. Be sure the pin (24) is not in the compensator
spool. See Figure 16.
2. Attach a vent line, with needle valve, into the vent
line, between the compensator and tank.
3. Close the valve in the vent line.
4. Start the pump and adjust the load to deadhead
(no flow). If there is a check valve installed before the
pressure gauge, allow some flow in the circuit (up to
10% of full flow).
5. Open the vent valve, and set the “minimum
pressure adjustment screw” (see Fig. 11) to 250 ± 25
psi (17 ± 1.7 bar).
6. Close the vent valve. Set the “upper pressure limit
adjustment” to the maximum desired compensator
setting. See Figure 11 for adjuster location.
7. Open and close the vent port several times. When
the valve is open, discharge pressure should drop to
the differential setting of 250 ± 25 psi (17 ± 1.7 bar).
When it is closed, discharge pressure should go to
the maximum compensator setting. Cycle the pump
from deadhead to full flow with the compensator
vented or unvented.
8. If flow is within accepted limits, and no leaks are
detected, remove the needle valve from the vent port.
9. The pump is now ready for remote control.
Control Option Adjustment Procedures - Load
Sensing Compensator
1. Make sure the pin (24, Fig. 16) is in the
compensator spool.
2. Install a sense line between the load valve and the
speed valve.
3. Open the load valve.
4. Back the upper pressure limit adjustment screw out
two (2) turns. (Fig. 12, page 16)
5. Using a speed valve, adjust the pump to zero flow
(deadhead). Note: if there is a check valve installed
before the pressure gauge, allow some flow in the
circuit (up to 10% of full flow).
6. Adjust the pressure differential adjustment screw to
∆
250 ± 25 psi (17 ± 1.7 bar). (Fig. 12)
7. Using the speed valve, adjust the pump to partial
flow (25-50% of full flow).
8. Close the load valve.
9. Set the upper pressure limit adjustment to the
desired compensator setting.
10. Open and close the load valve several times.
When the load valve is open, discharge pressure
should drop down to the pressure differential setting
of
∆
250 ± 25 psi (17 ± 1.7 bar). When the load valve
is closed, discharged pressure should go to the
maximum compensator setting.
11. Using the load valve, adjust the discharge
pressure from 500 psi (34.5 bar) to 2500 psi (172.4
bar). The differential pressure should be at
∆
250 ± 25
psi (17 ± 1.7 bar) throughout the range.
12. Using the speed valve, cycle the pump from zero
flow (deadhead) to full flow.
13. If flow is within accepted limits, and no leaks are
detected, the compensator is ready for operation.
Control Option Adjustment Procedures - Horse
Power Limiting Compensator
1. Be sure the proper orifice is installed in the pump
discharge port.
2. Install the sense line into the circuit.
16
Form No. R92.00 Rev. 10/03
Figure 13
PUMP ASSEMBLY (continued)
Figure 11
Figure 12
