Ls Pressure Limiting Valve; Ls A, B Shuttle - Danfoss PVG 32 Service Manual
Proportional valve group
Hide thumbs
Also See for PVG 32:
- Technical information (76 pages) ,
- Service manual (15 pages) ,
- Application manual (13 pages)
Table of Contents
Advertisement
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
11039167 | AX00000031en-US0301 | 27
Ball should move
freely behind disk.
P107 804
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
Need help?
Do you have a question about the PVG 32 and is the answer not in the manual?
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