Optimal P 650, Manual

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5. Although the gate has been closed and locked properly, the blades do not move
down.
- The safety switch at the lock needs readjustment.
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The electricity supply is interrupted. Check fuses at power unit.
6. The blades do not close properly although the spade cylinders are fully extended.
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Guides are worn and must be replaced.
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Blades are bent and have to be adjusted.
7. One function (any) does not work.
- The electricity supply is interrupted. Check power circuit.
- The magnet of the respective control valve is defect. Valve must be replaced.
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The plunger of the control valve is seized, probably due to a dirt particle in the
hydraulic oil. Disassemble valve and clean.