3
Form No. R32.00 Rev. 4/99
A pressure gauge located at the pump must be used
when making adjustment to insure the pressure
settings do not exceed limits specified for the particular
pump of maximum system pressure.
Make all pressure settings with 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
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 a
maximum rated volume at the factory unless otherwise
specified.
Stop adjustment of 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 follow-
ing steps:
1. Set the pump at minimum pressure.
2. Hand tighten the volume screw until it touches cam
ring. NOTE: The pump should be at full flow for this
step.
PRESSURE & VOLUME ADJUSTMENT SENSITIVITY
Pressure
Adjustment
PUMP SIZE 15B 20B 30B
Pressure
Change/Turn
PSI
(bar)
230
(16)
310
(21)
230
(16)
Maximum
Torque
Ft-lbs.
(m-kg)
15
(2)
20
(3)
15
(2)
Volume
Adjustment
Flow Change
Turn
gpm
(lpm)
10
(38)
10
(38)
13
(49)
Approx. Min.
Flow Adj.
gpm
(lpm)
2
(7.5)
2
(7.5)
3.5
(13)
Maximum
Torque
Ft-lbs.
(m-kg)
21
(3)
29
(4)
21
(3)
CAUTION
- Turning the maximum volume
control in too far can force the cam ring over-
center and destroy the pump.
3. See Pressure and Volume Adjustment Sensitivity
chart below.
4. Deadhead the pump, 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 output flow is incorrect, switch pump to deadhead
and readjust per above.
PVR15 KIT LIST
WEAR PLATE KITS
MODEL
KIT NUMBER
15B
252620
20B
252621
VANE KITS
Includes Item: 7.
MODEL
KIT NUMBER
All Models
250310
SEAL KITS
Includes Item: 13,14,15,16,17,24,25,27,28,29,34,37,39.
MODEL
KIT NUMBER
All Buna N
250008
All Viton
250009
COMPLETE REBUILD KITS
MODEL
KIT NUMBER
15B
252777
20B
252778
ROTATING KITS
Includes Items: 3,6, and 21.
MODEL
KIT NUMBER
15B
127894
20B
130690
