Closed Center Plug And Orifice - 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
Closed center plug and orifice
Failure mode
Valve operates at system relief
setting at all times
Can not adjust main relief above
pump pressure setting of 30 Bar
[450 psi] Delta for closed inlet
sections
©
Danfoss | February 2017
Serviceability: Open center plug is serviceable.
1. Use a 6 mm internal hex to remove cavity plug from valve.
2. Use a 3 mm internal hex to remove open center plug.
3. Clean or replace open center plug.
4. Install open center plug.
5. Torque plug to 4 Nm [35 lbf•in].
6. Install new seal washer and install cavity plug. Torque to 35 Nm [130 lbf•in].
Open center plug
Plug
6 mm
35 Nm
[308 lbf•in]
Seal
washer
Open
center
plug
3 mm
4 Nm
[35 lbf•in]
Description: Plug that is installed in the inlet cover for a system with a variable displacement pump.
Location: In the PVP module (Inlet cover).
Function: Allow connection for the load sense signal to the pump and provide connection to the main
system relief valve.
Cause
Plug and orifice are not seated properly
Orifice is plugged
Serviceability: Closed center plug and orifice are serviceable.
1. Use a 6 mm internal hex to remove cavity plug from valve.
2. Use a 4 mm internal hex to remove closed center plug.
3. Use a 2.5 mm internal hex to remove orifice.
4. Clean or replace orifice. Install orifice. Torque to 4 Nm [35 lbf•in].
5. Install new seal and install closed center plug. Torque to 8 Nm [71 lbf•in].
6. Install new O-ring and install plug. Torque to 35 Nm [130 lbf•in].
P107 736E
Corrective action
Reinstall orifice and torque to 4 Nm [35 lbf•ft] using a 3 mm
internal hex wrench.
Reinstall plug and torque to 8 Nm [71 lbf•in] using a 8 mm internal
hex wrench
Remove and clean orifice. Reinstall
11039167 | AX00000031en-US0301 | 23
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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