TYM T233 HST Service Manual page 151

SHOCK VALVES (Rererence)
The shock valves protect the steering unit against shocks from external forces on the steering cylinder.
The shock valves in the steering unit limit the max pressure drop from L to T and from R to T. The
shock valves are set at 1 l/min [0.27 US gal/min]. They are of the direct type and therefore have a very
quick reaction. The setting tolerance is +20 bar [+290 psi].
CHECK VALVE
The check valve protects the driver against kickbacks in the steering wheel. It prevents the oil from
flowing back into the pump line during steering under high pressure on the cylinder side. The check
valve is mounted in the P-connection of the steering unit.
PRESSURE DROP IN NEUTRAL
The pressure drop is measured with the steering
unit in neutral position.On the SHINJIN ON the
pressure drop is measured from P to T. The values
are valid at an oil temperature of 50°C [122°F] and
a viscosity of 21 cSt [100 SUS].
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