7 - Fault finding
55
Hydraulic Related Issues
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.
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Most valves will have an override pin. This is a small brass colored hole located at the end of each coil at the centre.
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.
÷
NOTE! If your sprayer is equipped with a bypass valve, it will need to be activated anytime a hydraulic function is
required.
Problem(s)
Possible Cause(s)
Suggested Solution(s)
Boom(s) will not raise or lower.
Hydraulic oil is not being supplied to the AutoHeight
valve block.
Ensure that hydraulic oil is supplied at the
AutoHeight 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.
There may not be enough back pressure to activate
the check valves in the AutoHeight 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 AutoHeight
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 AutoHeight valve block. The lower lines
should be connected to the "A" ports.
The boom will raise when it should lower, or vice
versa.
The raise and lower lines to the tilt cylinders may be
reversed.
Check the cable connections to the valve block and
ensure they are not reversed.
Ensure the raise lines are connected to the “B” ports
on the AutoHeight valve block. The lower lines
should be connected to the “A” ports.
The boom will creep up or down in manual mode.
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.
May be an internal problem with the AutoHeight
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 also need repairing.
There may not be enough back pressure to activate
the check valves in the AutoHeight 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 AutoHeight
valve block.
The hydraulic oil is overheating.
Using the AutoHeight system at higher sensitivities
may create a greater demand on the sprayer’s
hydraulics.
Try lowering the sensitivity. See “Sensitivity (Sensi)
Setting” on page 14.
Plumbing single acting systems as double acting
with orifices in both “A” ports may reduce the
heating.
See “Hydraulic hook-up” on page 23. Contact HARDI
for more information.
Summary of Contents for AutoHeight
Page 5: ...5 1 Declaration This page is intentionally left blank ...
Page 6: ...1 Declaration 6 ...
Page 22: ...3 Description 22 ...
Page 46: ...5 Operation 46 ...
Page 50: ...6 Maintenance 50 ...
Page 58: ...8 Technical specifications 58 ...
Page 60: ...9 Index 60 ...
Page 62: ...HARDI INTERNATIONAL A S Helgeshøj Allé 38 DK 2630 Taastrup DENMARK ...
