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8.3.4
•
Boom raises when it should lower, or vice versa
Possible Cause(s)
Suggested Solution(s)
a)
Wrong valve cable
connection
a)
Ensure cable connection to the NORAC
valve block
b)
Wrong plumbing
b)
Ensure the plumbing is correct:
•
The boom raise line(s) connect(s) to the “B” port(s)
on the NORAC valve block.
•
The boom lower line(s) connect(s) to the “A” port(s)
on the NORAC valve block.
•
The Tank and Pressure lines connect to the Tank
(“T”) port and Pressure (“P”) port on the NORAC
valve block, respectively.
8.3.5
•
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)
Place orifices in the “A” lines going to
Tank (“T”) in order to create sufficient
back-pressure to activate the pilot-operated
check valves in the NORAC valve block.
f)
Problem within the
sprayer’s hydraulic
network (system)
f)
Check the sprayer’s hydraulic network.
