Pressure Adjustment Spool - Danfoss PVG 32 Service Manual

Service Manual
PVG 32 Proportional Valve Group
PVG 32 Component Troubleshooting

Pressure adjustment spool

Failure mode
In open center systems the valve
sections are unstable
The adjusted pressure will not
remain static in a closed center
system
24 | © Danfoss | February 2017
Closed center plug
Plug
6 mm
35 Nm [308 lbf•in]
Closed center
plug
4 mm
Orifice
8 Nm
[70 lbf•in] 2.5 mm
4 Nm
[35 lbf•in]
Description: Main pump flow unloading spool.
Location: PVP (inlet) module.
Function: For open center systems it is the main relief and unloading spool
For closed center systems it is the main relief spool.
Cause
High wear allows leakage to tank
Low viscosity oil allowing high leakage
around spool to tank.
High wear
Serviceability: Spool is not serviceable. Replace complete module.
Pressure adjustment spool
Orifice
O-ring
Seal
Corrective action
Replace compete module
Remove and clean orifice. Reinstall
Replace compete module
Pressure adjustment spool
Plug
P107739E
P107 737E
11039167 | AX00000031en-US0301