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11 Fault diagnosis
11.1 Uneven spread pattern
Fertiliser build-up
•
Remove fertiliser build-up around spreading discs, vanes and metering out-
let tracts.
•
Check that disc vane positions correctly correspond to the spreading charts.
Too much fertiliser within the tractor tracks
•
Check that disc vanes are correctly positioned as per spreading charts.
•
Check disc vanes and metering outlets for damage. Replace defective
parts immediately.
•
Fertiliser
granules
have
a smoother surface than those tested for the sprea-
ding chart (see section 6.6)
Too much fertiliser in overlapping zones
•
Check that disc vanes are correctly positioned as per spreading charts.
•
Fertiliser granules have a rougher surface that those tested for the calibrati-
on charts (see section 6.6).
•
Pto speed is higher than what the tractor tachometer indicates. Check rpm.
Spreading application higher on one side than the other
•
Check that metering slides are correctly balanced (see section. 8.5)
Fertiliser flow to spreading discs is uneven
•
Check agitator and replace, if necessary.
•
Fertiliser has formed a bridge over the metering outlet
Spreading discs are fluttering
•
Check that synthetic castellated disc hub nuts are correctly tightened and
seated. Replace if defective.
With closed metering slides, fertiliser trickles out of the hopper
•
Check the distance between the lower edge of the agitator finger and the
hopper floor. If it is more than 3mm the hopper must be shimmed between
hopper floor and frame.
11.2 Fault diagnoses for hydraulic metering controls
Hydraulic cylinder does not open
•
Metering slides are too stiff. Check that slides, levers and pivot points are
free and adequately lubricated.
•
Restrictors in the hydraulic circuits are dirty. Remove and clean.
Hydraulic cylinder opens too slowly
•
Oil is not thin enough. Replace existing restrictor with a 1mm size restrictor.
The restrictor is situated in the input pressure hose connection on the cylin-
der. (
With double acting cylinders in the cylinder base hose connecti-
ons.
)
11.3 Disc vane wear
Some spreading products like Thomas Potash cause a higher wear rate on disc
vanes. Change worn disc vanes as per sections 9.2 and 9.3 "Replacing disc
vanes".
