Item Port description Wrench size Torque Gauge size
M3 Charge pressure gauge ¼ in 24 N•m [17 lb•ft] 0–50 bar
[0–1000 psi]
L2 Case drain
9/16 in (045/053) 48.5 N•m [35.8 lb•ft] (045/053)
0–10 bar
[0–100 psi]
5/8 in (060/068) 148 N•m [109 lb•ft] (060/068)
See Fastener Size and Torque Chart on page 76 for torques and wrench sizes on other charge pressure
relief valves.
1. Install a 50 bar [1000 psi] pressure gauge in charge pressure gauge port M3.
2. Install a 10 bar [100 psi] gauge at case pressure port L1, L2, or L3.
The table below shows the acceptable pump charge pressure range for some nominal charge relief
valve settings (refer to model code located on serial number plate).
Charge pressure range setting
Current
code
20 22 24 26 28 30 32 34 NA
Old code BK BB BD BF BH CK CB NA CD
Pressure
setting
20 ± 1.5 bar
[290 ± 21.8
psi]
22 ± 1.5 bar
[319 ± 21.8
psi]
24 ± 1.5 bar
[348 ± 21.8
psi]
26 ± 1.5 bar
[377 ± 21.8
psi]
28 ± 1.5 bar
[406 ± 21.8
psi]
30 ± 1.5 bar
[435 ± 21.8
psi]
32 ± 1.5 bar
[464 ± 21.8
psi]
34 ± 1.5 bar
[493 ± 21.8
psi]
36 ± 1.5 bar
[522 ± 21.8
psi]
Listed pressures assume a pump speed of 1800 min
-1
(rpm), a reservoir temperature of 50°C [120°F],
and charge flow of 30 l/min [7.9 US gal/min]; referenced to case pressure. At higher pump speeds or
higher charge flows the charge pressure will rise over the rated setting.
3. Loosen the locknut and rotate the adjusting screw clockwise to increase the setting; or
counterclockwise to decrease it.
4. Subtract the case pressure reading to compute the actual charge pressure.
Pressure change per turn is dependent on charge flow entering pump.
5. While holding the adjusting screw, torque locknut to 40 N•m [30 lbf•ft].
6. When you achieve the desired charge pressure setting, remove the gauges and plug the ports.
Service Manual
H1T 045/053, 060/068 Axial Piston Tandem Pumps
Adjustments
©
Danfoss | September 2020 AX152886481761en-000405 | 41
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