Pilot relief valve
The pump flow is adjusted to approx. 25 l/min and pressure to max 210 bar.
The steering wheel is actuated until the steering cylinder reaches one of its end strokes and the steering
wheel is actuated in this cylinder position with steering torque 25 ±5 Nm.
The pilot relief valve (item 95 of exploded view) is set according to specification: Maximum steering
pressure (P-T), bar, for the code in question.
The setting pressure is the pressure on the P-port minus the T-port of OSPE.
Neutral positioning test, OSP part
After adjusting the pilot relief valve, the steering wheel must be able to go to neutral position by itself no
later than ~1 second after the activation of the steering wheel has been stopped.
The steering unit is in neutral position when the pressure drop (P-T) is no higher than 18 bar.
Neutral positioning test, EH part
For OSPE with PVES, PVED CC, PVED CL: Apply battery power to the coil (item 247 on exploded view).
Apply battery power and input signal to the PVE: observe that the steering cylinder is moving according
to direction of input signal for PVE. Apply neutral position signal for PVE, observe that cylinder movement
stops and that pressure LS-T drops to max. 10 bar.
For OSPE with PVED CLS: The coil (item 247 of exploded view) is controlled by the PVED CLS.
Manual steering
Without pressure on P and T ports, the unit must be able to steer in a smooth manner to the right and to
the left observed by the cylinder movement.
For OSPED: the number of turns on the steering wheel for moving the steering cylinder from lock to lock,
must increase in comparison to do this test with normal pump supply. Without pump supply the number
of turns must match cylinder volume/emergency steer displacement of OSPED. Example: Cylinder
volume: 600 ccm, and OSPED 60/185 LSRM > Number of turns must be 600/60 ~ = 10 turns.
Shock valves
Remove pump supply to P port of OSPE and plug the P-port. Remove the steering cylinder
connection. T must still be connected to tank of pump station.
OSPE LSRM
L and R ports are connected through the spool/sleeve set in neutral, steering wheel must be untouched
during setting of shock valves:
1. Plug the L- port and apply pump pressure to the R-port. The shock valves are to be set at an oil flow of
3 l/min. The supply must be limited to max 280 bar on the pump station.
2. Screw one of the shock valves (item 64) outwards until pressure is reduced to the lower specified
value + 15-20 bar and flows comes out of the T-port (e.g. 235-240 bar of specified value 220-240 bar)
3. Screw the other shock valve (item 64) outwards until pressure is reduced to the lower specified value
+ 0-5 bar and check that flow out of T-port continues (e.g. 220-225 bar of specified value 220-240
bar).
OSPE LS (non reaction/non reaction versions)
The shock valves are to be set at an oil flow of 3 l/min applied to one of the servo ports L and R at a time.
The supply must be limited to maximum 280 bar on the pump station.
Service Manual
OSPE Steering Valve
Test and valve setting of OSPE
44
L1506577 • Rev 0001 • August 2015
