10. Shuttle Valve - Danfoss PVG 32 Service Manual

Service Manual
PVG 32 Proportional Valve Group
PVG 32 Component Troubleshooting
Failure mode
No pump pressure developed in
one or more valve sections
Shuttle valve
Failure mode
Valve sections will not build
pressure (NOTE: Normally it will be
one section, but not all sections)
26 | © Danfoss | February 2017
Function: Directs the highest load pressure to either OC or CC pump control to satisfy the operating
valve section.
Cause
LS passages blocked or restricted
Serviceability: Not serviceable. Ensure entire system is clean.
LS circuit
PVP
PVB
PVB
LS
circuit
Description: Self cleaning internal shuttle system.
Location: PVB (valve section) module.
Function: Determines which valve section is developing highest load pressure.
Cause
Worn shuttle disc
Excessive air entrained in the hydraulic oil
Serviceability: Not serviceable. Ensure entire system is clean.
Corrective action
Disassemble valve. Inspect passages for blockage
Corrective action
Replace complete module (seat is pressed into module)
Ensure that the oil has enough dwell time in tank, has good anti-
foaming agent, and pump inlet vacuum is within specifications
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10. Shuttle valve

P107 815E