Ls Pressure Limiting Valve; Ls A, B Shuttle - Danfoss PVG 32 Service Manual

Service Manual
PVG 32 Proportional Valve Group
PVG 32 Component Troubleshooting

LS pressure limiting valve

Failure mode
Section will not build pressure in
one spool direction
External leaking
Pressure adjustment backs off

LS A, B shuttle

© Danfoss | February 2017
Shuttle valve
Exploded view shows internal parts.
Do not disassemble valve.
Description: Optional adjustable pilot relief valve.
Location: PVB (spool body section) module.
Function: Controls the maximum working pressure delivered to each work port.
There is one LS pressure limiting valve for each work port.
Cause
Contamination
Low cartridge torque
Adjust pressure to valve specifications
Serviceability: Adjustable and non-serviceable. If adjustment does not solve the problem, replace
complete cartridge.
Valve removal tool P/N: 155L6485. Torque to 20 Nm [177 lbf•in].
Description: The shuttle valve isolates the LS(A) and LS(B) load sense signal.
Location: Option PVB module with only load sense relief.
Function: Ensure that each pressure limiter valve can create separate pressures for A and B LS signal.
Ball should move
freely behind disk.
Corrective action
While under pressure back out to minimum pressure and allow oil
to leak by for approx. 5 seconds and then readjust to correct
pressure - Ensure system is clean - Replace PVB
Torque to 20 Nm [177 lbf•in] maximum
Replace complete assembly
If adjustment doesn't hold, replace valve
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Ball should move
freely behind disk.
P107 804