NORAC UC5-BC-AL Manual - Manual (Page 51)

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11.4 Hydraulics
 When diagnosing hydraulic problems you should 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.
 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. By pushing in the pin you
can manually activate the valve. There must be pressure at the block for the function to
move.
 If your 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:
 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 you have any quick couplers in the system they must be properly
connected.
 Check the bypass valve (if equipped) for proper operation and cable connections to the
UC5 system. The bypass valve must be configured correctly in the manual valve setup
(Section 7.4.3).
 There may not be enough back pressure to activate the check valves in the Norac valve
block. You can place orifices in the “A” lines going to tank in order to create sufficient
back-pressure to activate the pilot-operated check valves in the Norac valve block.
 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 vise versa:
 Check the cable connections to the valve block and ensure they are not reversed.
 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 hydraulic oil is overheating:
 Using the UC5 system at higher sensitivities may create a greater demand on the
sprayer’s hydraulics. Try lowering the sensitivity.
 Plumbing single acting systems as double acting with orifices in both “A” ports may reduce
the heating. Contact Norac for more information.