Danfoss H1 P Installation guide

Brand: Danfoss

Model: H1 P

Type: Installation guide

Danfoss H1 P is a high-performance pump designed for demanding applications, providing exceptional pressure relief and control capabilities. Its robust construction ensures reliable operation, while its adjustable charge pressure relief valve allows for precise pressure regulation. The H1 P's compact size and efficient design make it suitable for a wide range of industrial and mobile applications, including construction, agriculture, and manufacturing.

CHARGE PRESSURE

RELIEF VALVE REMOVAL

1. Clean pump externally with clean solvent to

remove debris.

2. Using a 27 mm wrench, remove the charge

pressure relief valve. (V10)

1. Lubricate the external O-rings using petroleum

jelly.

2. Install the new charge pressure relief valve.

Using a 27 mm socket, torque to 47-57 N•m

[35-42 lbf•ft]

CHARGE PRESSURE

RELIEF VALVE

INSTALLATION

CHARGE PRESSURE

RELIEF VALVE

ADJUSTMENT

1. Install a 50 bar [1000 psi] pressure gage in charge pressure gauge port M3 (next to the adjust-

ment screw). Install a 10 bar [100 psi] gauge at one of the case drain pressure ports L1, L2,

L3, or L4. Operate the system with the pump in neutral (zero displacement) when measuring

charge pressure.

2. The table shows the acceptable pump charge pressure range for some nominal charge relief

valve settings (refer to the model code located on the serial number plate). These pressures

assume 1800 pump rpm and a reservoir temperature of 50°C (120°F), and are referenced to

case pressure.

3. Adjust valve. Clockwise rotation of the adjusting screw increases the setting, and counter-

clockwise rotation decreases the setting.

4. Torque locknut to 17.5 N•m [12.9 lbf•ft] using a 19 mm socket.

5. When desired charge pressure is achieved, rem

ove the gauges and plug the ports.

Charge pressure ranges

Model code Measured charge pressure*

20 bar [290 psi] ± 1.5 bar [21.8 psi]

24 bar [348 psi] ± 1.5 bar [21.8 psi]

26 bar [377 psi] ± 1.5 bar [21.8 psi]

30 bar [345 psi] ± 1.5 bar [21.8 psi]

* This is the actual charge pressure port

gauge reading minus the case pressure

port gauge reading. Factory set at 1800

min

-1

(rpm) with a reservoir temperature

of 50° C (120° F)

Listed pressures assume a

pump speed of 1800 rpm. At

higher pump speeds (with

higher charge ﬂows) the

charge pressure will rise over

the rated settings.

V10

60 N•m [45 lbf•ft]

27 mm

Adjusting screw

5 mm

Locknut

19 mm

Case drain port L2

17.5 N•m

[12.9 lbf•ft]

0 - 10 bar [0 - 100 psi]

95-136 N•m [70-100 lbf•ft]

Charge pressure gauge port M3

0 - 50 bar [0 - 1000 psi]

20-27 N•m [15-20 lbf•ft]

1/4 inch

9/16 inch

Service Kit Instructions

H1 pump

Charge pressure relief valve replacement procedure

Danfoss H1 P Installation guide

Danfoss H1 P Installation guide

Danfoss H1 P Installation guide

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