Norac UC4 - Boom will Not Stay Level or Settle over a Long; Boom(S) Creep(S) Upwards When in the

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4.3.5
 Boom(s) creep up or down in MANUAL mode
 Boom will not stay level or settle over a long period of time
Possible Cause(s) Suggested Solution(s)
a) Internal problem with
the NORAC valve
block (e.g. a sticking
or worn valve)
a) The valve block may need repairing or
replacing.
b) Cylinder leakage b) The cylinder sealsmay need replacing.
c) Faulty check valve(s)
in the NORAC valve
block
c) The check valve(s) may need replacing.
d) Foreign object stuck
in an internal port of
the NORAC valve
d) If possible, remove the foreign object or
the valve block may need repairing.
e) Not enough back-
pressure to activate
the check valves in
the NORAC valve
block
NOTE: Some Single Acting
valve systems only
e) Follow 4.3.1c).
f) Problem within the
sprayer’s hydraulic
network (system)
f) Check the sprayer’s hydraulic network.
4.3.6
 Boom(s) creep(s) upwards when in the transport position
Possible Cause(s) Suggested Solution(s)
a) Valve leakage
a) The valve block may need repairing or
replacing.
b) Faulty check valve(s)
in the NORAC valve
block
b) The check valve(s) may need replacing.