Clockwise and counter clockwise rotation
Port B
System
pressure
Port A
System
pressure
Counterclockwise rotation
Pressure limiter valves
Controls
Port B
Controls
Port A
Port B
System
pressure
Port A
System
pressure
Clockwise rotation
Pressure limiter valves
Controls
Port A
Controls
Port B
* Clockwise rotation as seen from
shaft end of pump
*
* Counterclockwise rotation as seen
from shaft end of pump
*
If you change pressure limiter settings, you must also change the HPRV valve to maintain proper PL
function. Refer to table below for corresponding settings.
Pressure limiter setting (bar)
PL setting
150
180
200
230
250
280
300
330
350
380
400
410
420
430
440
450
460
470
480
HPRV
setting
200
230
250
280
300
330
350
380
400
420
450
480
510
1. Install 600 bar [10 000 psi] pressure gauges in the high pressure gauge ports (MA and MB).
2. Install a 50 bar [1000 psi] pressure gauge in the charge pressure gauge port (M3).
Ensure charge pressure is properly set before checking pressure limiter.
3. Start the prime mover and operate at normal speed.
4. Use a 14 mm wrench for H1P 69-100 or a 17 mm wrench for H1P 115-250 to loosen the locking nut
(L024).
5. Activate the control input until pressure in the high side of the system loop stops rising. This pressure
is the PL setting.
6. Return the pump to neutral and adjust the PL setting using a 6 mm internal hex wrench for H1P
69-100 or a 5 mm internal hex wrench for H1P 115-250 .
7. Turn the adjusting screw clockwise to increase the PL setting, counter clockwise to decrease it.
The adjustment is very sensitive. Change per turn is 90 bar [1305 psi].
The model code on the serial plate gives the factory setting of the PL (Pressure Limiter). The PL setting
is referenced to charge pressure. Subtract charge pressure from system pressure gauge readings to
compute the effective PL setting.
The model code on the serial plate gives the factory setting of the PL (Pressure Limiter). The PL setting is
referenced to charge pressure. Subtract charge pressure from system pressure gauge readings to
compute the effective PL setting.
8. Repeat steps 4. and 5. until you reach the desired PL setting.
Service Manual
H1P 069—H1P 280 Axial Piston Single Pumps
Adjustments
36 |
©
Danfoss | January 2021
AX152886482551en-000601