3
Form No. 253585 Rev.
04/19
The pressure adjusting screw is located at the end
face of the compensator chamber. See parts page
item number 30. The adjusting screw has a right
hand thread; clockwise adjustment of the screw
increases the pressure; counterclockwise adjustment
reduces the pressure.
A pressure gauge located at the pump must be used
when making adjustments to ensure the pressure
settings do not exceed limits specified for the
particular pump or maximum system pressure.
Make all pressure settings with the pump operating
against a closed circuit, that is with the output of the
pump blocked, and then check pressure throughout
the pump flow range.
Volume Control Adjustment
Adjust volume at minimum pump pressure or at pump
deadhead. The volume adjusting screw is directly
opposite the pressure adjusting screw, see parts page
item number 55. The adjusting screw has a right
hand thread, turning the screw clockwise decreases
the maximum volume, turning the screw
counterclockwise increases the maximum volume.
Pumps are set at maximum rated volume at the
factory unless otherwise specified.
Stop adjusting the volume screw when pressure
begins to drop. See Sales Catalog for complete
pump performance specifications.
ADJUSTMENT PROCEDURES
To adjust the maximum output volume, use the
following steps:
1. Set the pump at minimum pressure.
2. Hand-tighten the volume screw until it touches the
pressure ring.
NOTE:
The pump should be at full flow
for this step.
3. See Pressure and Volume Adjustment Sensitivity
chart below.
4. Deadhead the pump, then turn the volume screw
the proper number of turns to obtain the flow desired.
5. Return pump to flow condition and check flow rate.
If the output flow is incorrect, switch pump to
deadhead and readjust per above.
CAUTION -
Turning the maximum volume
control in too far can force the pressure ring
over-center and destroy the pump.
PRESSURE and VOLUME ADJUSTMENT SENSITIVITY
PUMP SIZE
4B
6B
8B
PRESSURE CODE
10
15
03
06
10
03
06
10
PRESSURE Press Change/Turn
psi (bar) 255 (17.8) 270 (18.6) 115 (7.9) 210 (14.5) 240 (16.5) 115 (7.9) 210 (14.5) 240 (16.5)
ADJUSTMENT Max.Torque
ft./lbs.(kg/m) 4.0 (0.55) 6.0 (0.83) 1.4 (0.19) 2.6 (0.36) 4.0 (0.55) 1.4 (0.19) 2.6 (0.36) 4.0 (0.55)
VOLUME
Flow Change/Turn
gpm (lpm)
3.4 (12.5)
4.6 (17.4)
4.6 (17.4)
ADJUSTMENT Min. Flow Adjust.
gpm (lpm)
1.25 (4.7)
1.25 (4.7)
1.25 (4.7)
Max. Torque
ft./lbs. (kg/m)
2.5 (0.34)
1.0 (0.14)
1.0 (0.14)
