Pvpx Ls Unloading Valve - Danfoss PVG 32 Service Manual
Proportional valve group
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- Technical information (76 pages) ,
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Service Manual
PVG 32 Proportional Valve Group
PVG 32 Component Troubleshooting
PVPX LS unloading valve
Failure mode
Manual override leaking externally Not torqued correctly
Solenoid will not shift
©
Danfoss | February 2017
If replacing seal kit,
replace tie rods also
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8
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248
Refer to
PVPX Electrical LS unloading valve
Description: Optional two way two position solenoid.
Location: In the PVP.
Function: A safety device that dumps load sense to tank to prevent the pump from building pressure.
Cause
High usage
Manual override is bent
Coil not working
Too high or too low of voltage
for valve operation.
Corrective action
Check and retorque to 45 Nm [400 lbf•in]
Replace per valve specification
Replace per valve specification
Replace coil per valve specification
Check with OHM meter:
12 volt system - 8.7 OHMs
24 volt system - 33 OHMs
Confirm voltage in system from remote controller:
12 volt system should not exceed 13.2 volts
24 volt system should not exceed 26.4 volts
11039167 | AX00000031en-US0301 | 37
P107 817E
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Table of Contents
Troubleshooting
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Questions and answers
После нескольких поворотов катка гидравлика уходит в аварию при перезагрузке снова срабатывает несколько раз и останавливается в аварии.
The Danfoss PVG 32 hydraulic system could go into fault mode after several turns of the roller due to the following possible causes:
1. Contamination in Hydraulic Oil – Dirt or debris in the oil can affect valve operation.
*Check*: Take an oil sample.
*Corrective Action*: Flush the system and refill with clean, filtered fluid per OEM specifications.
2. Air in Hydraulic Pilot Lines – Air trapped in the signal lines can cause unstable operation.
*Check*: Inspect for air in the signal lines.
*Corrective Action*: Bleed air from the hose connection at the valve section.
3. Low Hydraulic Oil Supply – Insufficient oil can cause pressure drops and improper function.
*Check*: Verify fluid level in the reservoir.
*Corrective Action*: Refill with clean, filtered fluid per OEM specifications.
4. Faulty Hydraulic Remote Actuator – A malfunctioning actuator can lead to inconsistent valve response.
*Check*: Measure signal pressure from the remote hydraulic controller.
*Corrective Action*: Repair or replace the actuator.
5. External Hydraulic Pilot Pressure Too Low – If pressure is too low, the main spool may not function properly.
*Check*: Measure external pilot pressure from the pilot pump and check for restrictions.
*Corrective Action*: Ensure the pilot pressure meets the required specifications.
6. Leaking or Burst Supply Hose – A damaged hose can lead to pressure loss and system faults.
*Check*: Inspect supply lines to the valve stack.
*Corrective Action*: Repair or replace damaged hoses.
These potential causes should be systematically checked and corrected to restore proper system operation.
This answer is automatically generated