REMOVAL OF PRESSURE LIMITER

1. Clean pump externally with clean solvent to remove debris.

2. Using a 22 mm wrench, remove the pressure limiter. (L100)

1. Lubricate the external O-ring (L020) using petrolium jelly.

2. Install the new pressure limiter. Using a 22 mm socket, torque to 63-77 N•m [46-57 lbf•ft].

INSTALLATION OF PRESSURE LIMITER

PRESSURE LIMITER ADJUSTMENT

To adjust the pressure limiter setting, the motor output shaft must be locked. Lock the vehicle’sbrackes or rigidly fix the work function so it cannot rotate.

1. Install a 600 bar [10,000 psi] pressure gage in the high pressure gauge ports (MA and MB). Install a 50 bar [1000 psi] pressure gauge in the pump charge pressure gauge port (M3).

22 mm

63-77 N•m [46-57 lbf•ft]

L100

L020

2. Start the prime mover and operate at normal speed.

3. Use a 17 mm wrench to loosen the locking nut,

4. Use a 5 mm internal hex wrench to turn the pressure adjusting screw.

5. The factory preset pressure limiter setting is shown on the model code located on the serialnumber plate. It is referenced to charge pressure. The pressure limiter setting is the differencebetween the high and low pressure sides of the system loop. Activate the control input so that pressure increases in the high pressure side of the closed circuit to the pressure limiter pressure setting. The pressure limiter setting is reached when the pressure stops increasing and remains steady (as shown on the gauges).

S ystem pressure gauge po rt MB

(on bottom)

5 mm

Pressure limiterlocking nut

17 mm

P104 465E

12 N•m [8.9 lbf.ft]

System pressure gauge po rt MA

0 - 600 bar [0 - 10,000 psi]

1/4 inch

20-27 N•m [15-20 lbf•ft]

0 - 600 bar [0 - 10,000 psi]

20-27 N•m [15-20 lbf•ft}

Charge pressure gauge po rt M3

0 - 50 bar [0 - 1000 psi]

20-27 N•m [15-20 lbf•ft]

HPR V va lv e

Pressure limiteradjusting screw

1/4 inch1/4 inch

WarningUnintended movement of the machine or mechanism may cause injury to the technician or bystanders. To protect against unin-tended movement, secure the machine or disable/disconnect the machanism while servicing.

© Danfoss, 2013 BLN-10278 • Rev AC • September 2013 1

Service Kit Instructions

H1 pumpPressure limiter replacement procedure

PRESSURE LIMITER ADJUSTMENT

Po rt B System pressure

Po rt A System pressure

Co unterclockwise rotation Pressure limiter valves

Co ntrols Po rt B

Co ntrols Po rt A

Po rt B System pressure

Po rt A System pressure

Clockwise rotation Pr essure limiter valves

Co ntrols Po rt A

Co ntrols Po rt B

P106 250E

6. Return the pump to its neutral (zero flow) position and adjust the pressure limiter setting byrotating the pressure adjusting screw with the internal hex wrench. Clockwise rotation of the pressure adjustment screw will increase the pressure setting, and counterclockwise rotation will decrease the pressure setting. Each complete rotation of the pressure adjusting screw changes the pressure 150 bar [2176 psi].

7. Verify the pressure setting by actuating the control input so that the pump again developespressure in the high pressure circuit. Check pressure difference. Allow the pump to return to its neutral position. The pressure in the high pressure circuit should return to the charge pres-sure setting. Repeat step 6 until desired setting is reached.

8. While holding the pressure adjusting screw stationary, torque lock nut to 12 N•m [8.9 lbf•ft]. Do not overtorque.

9. Shut down the prime mover. Remove gauges and install gauge port plugs. Replace the plas-tic dust plugs (if used).

The pressure limiter setting must be set at 30-50 bar [435-725 psi] below the high pressure relief valve setting. refer to the pump order codeto find the pressure limiter valve and high pressure relief valve option and setting for your pump.

© Danfoss, 2013 BLN-10278 • Rev AC • September 2013 2