Load Drop Check 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
Load drop check valve
Failure mode
Load drops excessively when
trying to lift load
©
Danfoss | February 2017
Pressure compensator valve
Pressure compensator spool
Description: Keeps the load from dropping when transitioning from spool neutral to lifting the load.
Location: PVB (valve section) module.
Function: Optional drop check to keep the load from dropping. Prevents high pressure functions from
supplying low pressure functions when both are actuated simultaneously.
Cause
Worn parts.
Hard particle in seat area does not allow the
seat to seal
Serviceability: Load drop check valve is not serviceable. If you suspect valve malfunction, replace
complete module.
P107 744E
Pressure compensator spool
P107 822
Corrective action
Replace complete PVB module
Replace complete module
11039167 | AX00000031en-US0301 | 31
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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