GB 16 02 MA
Fault finding
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In cases where breakdowns have occurred, the same factors always seem to come into play:
1. Minor leaks on the suction side of the pump will reduce the pump capacity or stop the suction completely.
2. A clogged suction filter will hinder or prevent suction so that the pump does not operate satisfactorily.
3. Clogged up pressure filters will result in increasing pressure at the pressure gauge but lower pressure at the
nozzles.
4. Foreign bodies stuck in the pump valves with the result that these cannot close tightly against the valve seat. This
reduces pump efficiency.
5. Poorly reassembled pumps, especially diaphragm covers, will allow the pump to suck air resulting in reduced or
no capacity.
6. Hydraulic components that are contaminated with dirt result in rapid wear to the hydraulic system.
Therefore ALWAYS check:
1. Suction, pressure and nozzle filters are clean.
2. Hoses for leaks and cracks, paying particular attention to suction hoses.
3. Gaskets and O-rings are present and in good condition.
4. Pressure gauge is in good working order. Correct dosage depends on it.
5. Operating unit functions properly. Use clean water to check.
6. Hydraulic components are maintained clean.
FAULT
Boom slow/eradic.
Ram not functioning.
Boom wil not unfold.
Excessive noise from
hydraulic motor.
Tractor hydraulics safety
valve operating constantly
(open centre).
PROBABLE CAUSE
Air in system
Regulation valve incorrectly set
Insufficient hydraulic pressure
Insufficient amount of oil in
tractor reservoir
Restrictor or regulation valve
blocked
Oil bypassing rams.
Air in hydraulics.
Sprayer hydraulics set to
closed centre hydraulics.
CONTROL/REMEDY
Loosen ram connection and activate hydraulics
until oil flow has no air in it (not whitish).
Open or close until desired speed is achieved
(clockwise = less speed).
Remember oil must be at operating tempera-
ture.
Check output pressure of tractor hydraulics.
Minimum for sprayer is 130 bar.
Check and top up if needed.
Secure boom with “S” hook.
Dismantle and clean.
Increase fan r/min at valve block.
Top tractor reservoir up. Use oil that does not
foam.
Swap nipple at valve block.
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