Fig. 1 - Fit diameter between internal and external
elements of the control valve.
Fig. 2 - Testing pressure in the hydraulic steering
circuit.
Afitting
Bcylinder
Fig. 3 - Correct assembly of orbital pump unit
Inspections and checks
Steering pump
Clean all component parts of the pump thoroughly, using petrol.
Check that the gears are not unduly worn, otherwise repalce.
Directional control valve
Clean all parts of the valve thoroughly.
Check, utilizing a comparator for internal dimensions, that the
clearance between spool and sleeve (A - B - Fig 1) is no greater
that 0.03 mm: otherwise replace.
The two components are not available separately as spare parts.
Check the setting of the pressure relief valve.
Couple pressure gauge 5.9030.513.0 by means of adaptor
5.9030.579.0 to the fitting of the left hand steering cylinder (as
indicated in fig 2).
Start the engine and allow to idle for a few minutes; then, with the
steering on full right hand lock, turn the wheel further until the hand
of the gauge stabilizes at around the maximum pressure. If this is
different to the maximum operating pressure (150 bar), adjust the
setscrew (A - fig 10, page 300) of the valve until the requisite value
is re-established in the circuit.
Repeat the same sequence of operations with the pressure gauge
and adaptor fitted to the right hand steering cylinder, this time on
the left hand lock.
Bleeding the hydraulic circuit
Start the engine and allow to idle at minimum rpm.
Loosen the two fittings at the cylinder and turn the steering wheel
each way until oil emerges devoid of air bubbles.
Assembly of orbital pump unit
Locate the rotor A in the stator B as illustrated, making certain that
the pin C is perpendicular to the plane x - x of the valve body as
indicated in fig 3.
controls
hydrostatic steering
63
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