No Cylinder/Motor Response In Either Direction When Remote Controller Is Actuated; Cylinder/Motor Responds In One Direction Only - Danfoss PVG 100 Service Manual

Service Manual
System Troubleshooting

No Cylinder/Motor Response in Either Direction when Remote Controller is Actuated

Cause
Verify if fault is mechanical, electrical or hydraulic Operate manual lever to confirm mechanical or
Sticking main spool
Internal filters blocked

Cylinder/Motor Responds in One Direction Only

Cause
Verify if fault is mechanical, electrical or hydraulic Operate manual lever in both directions to
Air in system
Internal leakage
Shock valves
Solenoid actuation
Main spool travel restricted
Remote electrical controller
PVEO connections
Remote hydraulic controller PVRH
16
PVG 100 Proportional Valves
Check
electrical or hydraulic
Remove manual, electrical, and hydraulic
actuators from the valve section. Remove main
spool from valve section and inspected for
damage. If no damage reinstall the main valve
spool and it should move freely in the valve
section bore.
Check movement of manual lever when electrical
controller is operated
Check movement of manual lever when
hydraulic controller is operated
If none of the above check pump per
manufacturers recommended procedure
Check for blockage in internal filters
Check
confirm if mechanical or electrical or hydraulic
If operating the manual lever strokes the
cylinder/ motor in one direction only, check
manual stop screw adjustment
Check movement of manual lever when electrical
controller is operated
Check movement of manual lever when
hydraulic controller is operated
Entrained air generates heat under pressure
Excessive internal leakage may overheat the
system.
Swap and see if problem follows
If power is OK from controller
Stop on manual controller turned in too far
Insufficient signal from electrical controller
Incorrect PVE/PVEO connections
Insufficient pilot oil pressure from remote
hydraulic controller Pressure needs to be 25 Bar
[360 psi]
11048807 • Rev BA • October 2014
Corrective action
If moving the manual lever operates the cylinder/
motor check electrical or hydraulic
Replace the valve module and main spool. If any
damage is found on the main spool
If manual lever does not move check electrical
voltage signal from controller, wiring at the PVE
module
If manual lever does not move check hydraulic
controller pressure at the PVG valve module - 25
Bar [360 PSI]
Repair or replace pump per manufacturers
recommended procedure
Remove blockage
Corrective action
If moving the manual lever operates the cylinder/
motor in both directions check electrical or
hydraulic
Back out manual stop on manual controller and
torque the jam not to 8 Nm [70 lbf•in] Do not
exceed maximum torque
If manual lever does not move in one direction
check electrical signal from controller and wiring
at the PVE module
If manual lever does not move in both directions
check hydraulic pressure at the PVG module
Look for foam or bubbles in reservoir. Check for
leaks on inlet side of charge pump.
Install loop flushing defeat option and monitor
case flow. If case flow is excessive, motor may
require major repair. Contact Danfoss Service.
Replace valves
Repair wiring to PVE module
Back out manual stop on manual controller
Repair or replace electrical controller
Connect correct way
Repair or replace remote hydraulic controller