© Danfoss, 2013 AN262753055643en-000102 | 70342065 • Rev 0102 • March 2018 1
Service Kit Instructions
H1P pumps
Charge pressure relief valve replacement procedure
CHARGE PRESSURE
RELIEF VALVE REMOVAL
1. Clean pump externally with clean solvent to
remove debris.
2. Using a 24 mm wrench, remove the charge
pressure relief valve. (V030)
1. Lubricate the external O-ring (V024) using
petroleum jelly.
2. Install the new charge pressure relief valve.
Using a 24 mm socket, torque to 52 N•m [38
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 (V020) increases the setting, and
counterclockwise rotation decreases the setting (at a rate of approximately 3.9 bar [56.6 psi]
per turn).
4. Torque locknut (V022) to 40 N•m [30 lbf•ft] using a 19mm socket.
5. When desired charge pressure is achieved, remove the gauges and plug the ports.
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
rt gauge reading. Factory set at 1800
-1
(rpm) with a reservoir temperature
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.
Case drain port L4
Charge pressure gauge port M3
V020
6 mm
V022
19 mm
Case drain port L2
40 N•m [30 lbf•ft]
D065 Optional construction port
0 - 10 bar [0 - 100 psi]
95-136 N•m [70-100 lbf•ft]
0 - 10 bar [0 - 100 psi]
9/16 inch
95-136 N•m [70-100 lbf•ft]
0 - 10 bar [0 - 100 psi]
3/16 inch
11-14 N•m [8-10 lbf•ft]
0 - 50 bar [0 - 1000 psi]
1/4 inch
20-27 N•m [15-20 lbf•ft]
P104 466E
5/8 inch
V030
52 N•m
[38 lbf•ft]
24 mm
