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TROUBLESHOOTING
QUESTION / PROBLEM
What hydraulic oil flow is required?
What RPM should the spinner shaft turn at?
What direction do the spinner discs turn in?
How do I prevent fertiliser product falling
out the sides and/or front of the spreader bin
(e.g. striping)?
What tension should be on the floor-belt and
chain assembly?
What are the minimum and maximum
application rates for various fertiliser
products?
How accurate is the spread pattern?
SOLUTION
Standard SAM Fertiliser Spreaders are fitted with two OMP50
hydraulic motors running in series, requiring an external oil flow
of 50 litres/minute plus 40 litres for the floor. For a total require-
ment of 90 litres.
The spinner shaft should turn at approx 850RPM.
When standing at the back of the machine, the right-hand spinner
disc should turn clockwise and the left-hand spinner disc
anti-clockwise.
The side-skirts (running the length of the machine, inside the
plastic bin) and front/rear bin scrapers will require regular
adjustment, particularly when the machine is new. Both the
side-skirts and front/rear bin scrapers are bolted (slotted holes)
onto the machine - these bolts can be simply loosened and the
skirt or scraper maneuvered to be flush with the floor-belt.
The floor-belt should be tensioned with a 40mm sag below the
middle of the chassis, with an even curve/sag from front to back.
From 45kg/hectare at 15m spreading centres for Urea (and similar
products), and up to 3,000kg/hectare at 10m spreading centres
for Lime.
Representative machines have been tested using the
nationally recognised Spreadmark test for accuracy. Spread
patterns are rated using Coefficient of Variation (CV), a
measure of the percentage of fertiliser outside a perfect spread -
0% being a perfect spread pattern.
New Zealand standards recognise a CV under 15% as acceptable
for nitrogenous fertilisers (DAP, Urea, Nitroposka Blue etc.). SAM
Fertiliser Spreaders have achieved a 7.1% CV for Urea and 8.1% CV
for Superphosphate - well within industry standards.
P17
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