of the steering wheel with the parking detent, to measure the operation of steering,
which must be under 150N.
(5) Measure the pressure with pressure meter (15-20MPa), cutoff valve and soft
tube in Fig. 5.4.
Remove the split-flow valve to the line of the turning implement, engage a line with
pressure meter on the side of diffluent valve, engage a line with breaking valve on the
side of turning implement, then make the engine run at a slack speed.
When the steering wheel is at a free state, the oil pressure is about 0.5-2MPa. If the
pressure is higher than it, check whether the diffluent valve and line is stopped or not. If
there is no abnormal thing, speed up the engine to about 1500r/min. Then close the
parking valve slowly and notice that the temperature of pressure is improved.
Move the highest pressure of the diffluent valve to 12MPa, so, when the parking
valve is closed, the pressure meter will show its pressure.
If the pressure is over 12MPa, it shows that the diffluent valve has malfunction. But if the
pressure is too low, it shows that the oil pump has malfunction or the spring of the
diffluent valve has rupture. In this circumstance, the time of the closed of the parking
valve can’t be over 15 seconds.
Notice: The oil pump provides pressure oil to make the cylinder run, so its task
must be thought in two ways, demarcate pressure and rating flux.
The pressure is to force the cylinder while the flux is relation to the speed of the
cylinder. It says that, even though the pressure is normal, to 12MPa, if the flux is lack,
the cylinder can’t run normally, resulting in that the steering is too heavy to operate. So
when the diffluent valve needs to be disassembled and be assembled again, adjust the
flux valve and safety valve properly according to the capacity and the operation of the
cylinder, then mark in the proper position to assemble again or measure the distance of
the bolt.
Fig5.5 Measure the pressure
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