High pressure relief valve (HPRV)
DDC20/24 high pressure relief valve (HPRV) removal
1. Mark the location of each valve for proper reassembly.
2. Remove the HPRV valve plugs (J140/J150).
3. Remove and discard O-rings (QJ020).
4. Use a magnet to remove the valves (N110/P110) and springs (N100/P100).
HPRV removal
P109625
QJ020
J140
QJ020
J150
P100
P110
N100
N110
HPRV plug
Item
Wrench size
Torque
J140/J150
24 mm
78 N•m [57 lbf•ft]
DDC20/24 high pressure relief valve (HPRV) inspection
Inspect the plug and internal parts of cartridge. If parts are worn or damaged, replace the entire
cartridge.
DDC20/24 high pressure relief valve (HPRV) assembly
1. Lubricate and install new O-rings (QJ020) onto each plug (J140/J150).
2. Verify that the springs (N100/P100) are properly retained on the valves (N110/P110).
3. Install the valves (N110/P110) in their original location as noted during disassembly. Ensure each
valve assembly moves freely in its bore.
4. Torque plugs per table.
5. Operate vehicle/machine through full range of controls to ensure proper operation. Check for leaks.
Service Manual
DDC20/24 Axial Piston Pumps
Minor repair
©
Danfoss | August 2019
L1120413 | AX00000135en-000401 | 21
