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Pump
FAULT
Liquid leaks from the bottom of the pump.
Grease leaks from the bottom of the pump.
Grease leaks from the shaft grease seals.
Lack of pressure.
Vibrations in system and unpleasant noise from the
pump.
Lack of flow / capacity.
Extreme internal erosion on diaphragm covers and
housing.
Short lifetime for diaphragm.
Hydraulic System, Z-version
FAULT
No boom movements when activated.
ParaLift lock does not lock.
Boom lift raises to max. position, when tractor
hydraulics are engaged.
Oil heats up in Closed Centre systems.
Individual hydraulic piston does not move.
PROBABLE CAUSE
Damaged diaphragm.
Grease used has too low viscosity.
Grease used has too low viscosity.
Bearings worn/too high friction.
Pump valves are clogged or defect.
Clogged filters in fluid system.
Pump valves are clogged or defect.
Air is being sucked into system.
Internal wear on conrod and conrod ring.
Pump valves are clogged or defect.
Too high vacuum caused by clogged suction filter or
excessive pump speed (rpm).
Lack of internal cleaning.
Lack of conservation of the fluid system during
storage.
Overspeeding of the pump.
Too high vacuum when filling from external source:
Hose dimension is too small.
Too long filling hose.
Bad filling conditions, e.g. too high water column
when transferring water from a buried tank.
PROBABLE CAUSE
Insufficient hydraulic pressure.
Insufficient oil supply.
Blown fuse(s).
Bad / corroded electrical connections.
Insufficient power supply.
Defective relay / diodes in junction box.
Clogged restrictors in bypass block.
Wrong polarity.
Back pressure in return line exceeds 15 bar.
Bypass valve does not close properly.
Internal leaks in flow regulator.
Clogged restrictor.
7 - Fault Finding
CONTROL / REMEDY
Replace diaphragm.
Change to recommended grease type.
Change to recommended grease type.
Replace pump bearings and grease seals.
Check for obstructions or, if needed, replace valves.
Clean filters.
Check for obstructions or, if needed, replace valves.
Check for leaks, pinholes in suction hoses, tightness /
gaskets / O-rings of all fittings on the suction side.
Poor greasing. Replace parts as needed and observe
proper grease quality and intervals.
Check for obstructions or, if needed, replace valves.
Replace affected pump parts.
Clean suction filter and observe maximum pump
speed (rpm).
Use recommended cleaning procedures and add
extra cleaning agents (e.g. AllClearExtra or similar).
Always use a proper mixture of antifreeze during
storage.
Observe maximum pump speed (rpm).
Fit a larger hose to the External Filling Device.
Park sprayer closer to the external tank and use a
shorter hose.
Change external water supply to obtain a lower
water column.
CONTROL/REMEDY
Check oil pressure.
Check tractor hydraulic oil level.
Oil flow must be 15 - 80 l/min (depending on the
equipment on the sprayer).
Check tractor hydraulic oil level.
Check / replace fuse in junction box.
Check / clean connections, multi plugs etc.
Voltage on activated solenoid valve must be more
than 8 volts.
Use wires of at least 4 mm for power supply.
Check relays, diodes and soldering at PCB in junction
box. LED diodes indicate boom functions.
Remove and clean restrictors in bypass block (See
hydraulic diagram). Change hydraulic oil + filter.
Check polarity. Red positive (+), black negative (-).
Connect the return line with a free flow to hydraulic
oil reservoir.
Divide return line in two and lead return oil back to
reservoir via two spool valves.
Check / close (screw in) by-pass valve.
Replace flow regulator O-rings and backup rings.
Replace flow regulator.
Dismantle and clean restrictor.
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