5-10t Internal Combustion Counterbalance Forklift Truck Operation & Maintenance Manual
fully closed, its set pressure will be indicated on pressure gauge.
It indicates that the bypass valve is out of order, if pressure exceeds 12MPa, but if pressure is too low,
it indicates that oil pump is out of order or the spring of bypass valve is broken. Under such
circumstances, attention shall be paid not to allow the time for turning off the shutoff valve to exceed
15 seconds.
Attention: Oil pump provides pressure oil to actuate the action of steering cylinder, and its work must
be considered from two aspects, namely nominal pressure and rated flow.
Pressure is used to actuate cylinder while flow rate is related to the acting speed of cylinder. On this
account, even if pressure is normal, reaching 12MPa, but if flow rate is insufficient, the steering
cylinder is still unable for normal work, leading to a heaving steering. Accordingly, when it is
required to disassemble and reassemble the bypass valve, the flow and the safety valve shall be
properly adjusted according to the capacity and the working condition under which the steering
cylinder is used. Fitting mark shall be stamped at the set position, thereby for reassembly to be
performed, or the distance of adjusting bolt shall be measured.
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