NORAC UC5-BC-AL Manual - Manual (Page 52)

48
The boom will creep up or down in manual mode:
 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, if installed, should
be connected to the “A” ports.
 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.