Danfoss PVG 32 Service Manual

Cause Check Corrective action
Main spool position feedback
transducer signal incorrect
Check feedback pin for damage Replace PVE
Contamination in hydraulic oil Take oil sample Flush complete system.
Fill reservoir with clean filtered fluid per OEM
specification
Air in hydraulic pilot lines Check for air trapped in signal lines from the
controller to the valve section module
Bleed air from the hose connection at the valve section
Hydraulic remote actuator faulty Check signal pressure from the remote hydraulic
controller
Repair or replace cylinder/motor
Low hydraulic oil supply Check fluid level in reservoir Fill reservoir with clean filtered fluid per OEM
specification
Hydraulic oil supply
Cause Check Corrective action
Pump not running Check prime mover for operation Repair or replace prime mover
Check condition of drive coupling Repair or replace drive coupling
Insufficient oil in reservoir Check fluid level in reservoir Fill with clean filtered oil
Leaking or burst supply hose Inspect lines to valve stack Repair or replace damaged hose
Relief valve malfunction Check for contamination and operation of relief valve Repair or replace relief valve
Isolating valves are closed Check that all isolating valves are open and clear
Faulty pump control Check pump compensator for correct operation and
setting per pump manufacturers
Repair or replace pump compensator per pump
manufacturers recommendations
Low standby pressure in PVP - open
center pump
Check idle standby pressure - 10 Bar [145 PSI] Replace
Check condition of compensator spool spring Replace module due to worn components
Low standby pressure in pump
control - variable pump
Check pump LS control for operation and setting
Stand by pressure should be 15 bar [220 psi]
minimum
Repair or replace LS control per pump manufacturers
procedures
PVP pressure relief valve faulty Check pressure relief valve spool and spring for
freedom of operation
Replace
PVP orifices blocked Check PVP orifices for blockage Remove blockage
Internal filters blocked Check for blockage in internal filters Remove blockage
Supply lines blocked Inspect supply lines for blockages Remove blockage
Internal hydraulic pilot pressure
insufficient
Inspect pilot oil pressure reducing valve for proper
operation
Repair or replace
Blocked LS galleries Check LS galleries for blockage Clean blockage from LS galleries
Shuttle valves faulty Check LS system shuttle valves for wear and damage Replace as needed
Check for contamination per specification HPP 030. Refer to Design Guideline for Hydraulic Fluid
Cleanliness, Technical Information Manual 520L0467. If fluid is out of spec., flush hydraulic system and fill
with clean filtered oil.
Electrical supply
Cause Check Corrective action
No electrical power Check electrical circuit Repair as needed
Verify emergency stop switch is in the proper operating position Reset
Neutral position switch faulty Check operation of neutral position switch in remote controller (if
connected in circuit) PVRE/PVRES/PVREL
Replace switch
Service Manual
PVG 32 Proportional Valve Group
System Troubleshooting
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©
Danfoss | February 2017 11039167 | AX00000031en-US0301

Danfoss PVG 32 Specifications

General

Brand	Danfoss
Model	PVG 32
Category	Control Unit
Language	English