NORAC UC5-BC-ECHO-VT - Manual (Page 48)

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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 8.5.3).
 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 vice 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.
The boom will creep up or down in Manual Mode:
 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.
 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.
 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.