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Service Manual
Test and valve setting of OSPE
Steering test
OSPE Steering Valve
4. If OSPE with PVES, PVED CC, or PVED CL, connect battery power cables with on/off switch to the coil
of control valve for mode select (247).
Voltage must meet the specification for the code.
For OSPE with PVED CLS, the coil (247) is controlled by the PVED CLS.
5. Connect voltage supply and signal input for the PVE.
6. Connect P port to pump supply.
7. Block LS port with steel plug.
8. Connect T and EF ports separately to tank of pump station.
T pressure should not exceed ~5 bar. The maximum allowed T pressure is 25 bar.
The pump supply circuit should not exceed 210 bar P-T.
9. Screw the adjusting screws of shock valves to block.
Screw clockwise as much as possible to a torque < 5 Nm to ensure the shock valves do not open
during steering test or setting of pilot relief valve.
Set up OSPE without integrated priority valve
1. Connect double rod cylinder to L and R ports of OSPE.
2. Connect pressure gauges to all ports of OSPE.
3. Connect steering column and steering wheel to the input shaft of the OSPE.
4. If OSPE with PVES, PVED CC, or PVED CL, connect battery power cables with on/off switch to the coil
of control valve for mode select (247).
Voltage must meet the specification for the code.
For OSPE with PVED CLS, the coil (247) is controlled by the PVED CLS.
5. Connect voltage supply and signal input for the PVE.
6. Connect an external priority valve between P of pump station and P of OSPE.
Use Danfoss priority valve OLS 80 code 152B8269, or other OLS 80 with same orifice and spring
specification.
Dynamic orifice: Ø1,0 mm
LS orifice: Ø1,2 mm
Spring: 7 bar
7. Connect LS port of OSPE with LS port of OLS.
8. Connect T port of OSPE to tank.
9. Screw the adjusting screws of shock valves to block.
Screw clockwise as much as possible to a torque < 5 Nm to ensure the shock valves do not open
during steering test or setting of pilot relief valve.
During the testing no motor effect, disturbing vibrations, noise, sticking or other irregularities must occur.
1. Start the pump, the pump flow is adjusted to approx. 25 l/min and pump pressure control must be
set to app. 70 bar.
2. Let the supplied oil flow through the steering unit for a few minutes. At the same time the steering
wheel is to be rotated a few times in both directions to bleed of air from the unit and the system.
3. Operate the steering wheel by approx. 10 rpm in a smooth manner from end stroke to end stroke of
the steering cylinder for at least 5 cycles. Make sure pressure P-T, 70 bar can be achieved, when
steering against end stroke. If this is not possible, the adjusting screw of the pilot relief valve (item 95
of exploded view) must be turned clockwise until P-T, 70 bar is achievable.
L1506577 • Rev 0001 • August 2015
43
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