PL valve adjustment Clockwise
P109552
060/068
A
B
1
2
3
Clockwise
rotation
4
C
D
Legend:
Controls pressure ports: B = 1, A = 2, C = 3, D = 4
Lock nut torque = 20 Nm [15 lb•ft]
PL valve adjustment Counterclockwise
P109553
060/068
A
B
1
2
3
Counterclockwise
rotation
4
C
D
Legend:
Controls pressure ports: A = 1, B = 2, D = 3, C = 4
Lock nut torque = 20 Nm [15 lb•ft]
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 17 mm wrench 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 an internal hex wrench.
Wrench size is in the diagram on the previous page.
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.
8. Repeat steps 4. and 5. until you reach the desired PL setting.
Service Manual
H1T 045/053, 060/068 Axial Piston Tandem Pumps
Adjustments
44 |
©
Danfoss | September 2020 AX152886481761en-000405
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