P109549
New style
Old style
Old style
3. Loosen the locknut and rotate the adjusting screw clockwise to increase the setting;
counterclockwise to decrease it. Subtract the case pressure reading to compute the actual charge
pressure.
Pressure change per turn is dependent on charge flow entering pump.
4. While holding the adjusting screw, torque locknut to 40 N•m [30 lbf•ft].
5. When you achieve the desired charge pressure setting, remove the gauges and plug the ports.
Charge pressure ranges*
Current style - option code Old style - option code
Pressure setting
20
BK
20 bar [290 psi] ± 1.5 bar[21.8 psi]
22
BB
22 bar [319 psi] ± 1.5 bar[21.8 psi]
24
BD
24 bar [348 psi] ± 1.5 bar[21.8 psi]
26
BF
26 bar [377 psi] ± 1.5 bar[21.8 psi]
28
BH
28 bar [406 psi] ± 1.5 bar[21.8 psi]
30
CK
30 bar [435 psi] ± 1.5 bar[21.8 psi]
32
CB
32 bar [464 psi] ± 1.5 bar[21.8 psi]
34
N/A
34 bar [493 psi] ± 1.5 bar[21.8 psi]
N/A
CD
36 bar [522 psi] ± 1.5 bar[21.8 psi]
* This is the actual charge pressure (gauge reading minus case pressure) factory set at 1800 min
-1
(rpm) with a reservoir temperature of 50° C [120° F].
Charge check / HPRV adjustment
The charge check/HPRV combines the charge check and high pressure relief functions. Whenever you
replace a charge check/HPRV, operate the vehicle/machine through its full range of functions to ensure
proper pump operation. The charge check/HPRVs are preset at the factory, no adjustment is possible.
Checking for proper charge check / HPRV operation
If you suspect charge check/HPRV malfunction, swap valves and test operation. If the symptoms switch
direction, replace the faulty valve.
Pressure Limiter Adjustment (060/068 only)
Lock motor output shaft to adjust the pressure limiter setting. Lock the vehicle’s brakes or rigidly fix the
work function so it cannot rotate.
1. Install 600 bar [10,000 psi] pressure gauges in the high pressure gauge ports (MA, MB, MC and MD).
Install a 50 bar [1000 psi] pressure gauge in the charge pressure gauge ports (M3 or AM3).
Ensure charge pressure is properly set before checking pressure limiter.
Service Manual
H1 45/53/60/68 Tandem Closed Circuit Axial Piston Pumps
Adjustments
34 |
©
Danfoss | June 2018
520L0928 | AX00000103en-US0303
