NORAC UC4.5-BC Operator Manual User Manual
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12.3 Hydraulics
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When diagnosing hydraulic problems, first determine if the electrical system is ok. Check
all cable connections and ensure they are tight and free of corrosion. Measure the electrical
output at the valve to ensure there is voltage at the connection.
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Most valves will have an override pin. This is a small brass colored hole located at the end
of each coil in the center. There will be one for each valve. Pushing in the pin will manually
activate the valve. There must be pressure at the block for the function to move.
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If the sprayer is equipped with a bypass valve it will need to be activated anytime a hydraulic
function is required.
Boom(s) will not raise or lower:
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Ensure there is hydraulic oil being supplied at the Norac valve block and that there is
pressure at the pressure port. The hydraulics will not work if the pressure and tank lines
are reversed. If there are any quick couplers in the system they must be properly
connected.
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The raise and lower lines to the tilt cylinders may be reversed. Ensure the raise lines are
connected to the "B" ports on the Norac valve block. The lower lines should be connected
to the "A" ports.
The boom will raise when it should lower, or vice versa:
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Check the cable connections to the valve block and ensure they are not reversed.
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The raise and lower lines to the tilt cylinders may be reversed. Ensure the raise lines are
connected to the "B" ports on the Norac valve block. The lower lines should be connected
to the "A" ports.
The boom will creep up or down in manual mode:
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The raise and lower lines to the tilt cylinders may be reversed. Ensure the raise lines are
connected to the "B" ports on the Norac valve block. The lower lines should be connected
to the "A" ports.
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This may be caused by a problem with the sprayer’s hydraulic system. Check the sprayer
hydraulics. Check if the tilt cylinders are leaking and replace the seals if needed.
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There may be an internal problem with the Norac valve block. Some possible causes are; a
sticky valve, worn valve, faulty check valves or a foreign object stuck in the valve block. If
possible try removing any foreign objects in the valve. The valve block may need also
repairing.