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FINE TUNING OF DISTRIBUTOR AND BLADE SETTINGS
All Mobility Spreaders are given an average standard factory se ng of distributor blades. Such a se ng, of course,
cannot be perfect for all fi eld condi ons and materials. The following informa on will be helpful in adjus ng the
distributor blades on your machine to give op mum performance for your specifi c condi ons.
Your spread pa ern will be aff ected by 1) the material used, 2) the distributor blade se ng, and 3) the rota on speed
of the distributors. The distributors are designed to be operated at 750 RPM (540 tractor P.T.O. RPM). A plus or minus
10% change in distributor RPM will increase or decrease spread pa ern width accordingly. An increase in PTO RPM will
tend to deposit less material at the center of the spread pa ern, while a decrease will deposit more material at the
center. The physical characteris cs of the materials being spread, which are important to the spread pa ern, include
bulk density, par cle size, par cle shape, physical strength and rugosity or surface roughness. For best performance it is
recommended that you fi ne tune your machine to the material being used. The spreading profi le and spread swath
width can be changed dras cally by altera on of the se ng of the distributor blades. The drawing on the next page
shows had blades may be extended from or retracted toward the center of the disc. Also, the angle of blade
intersec on with a radius of the disc may be altered. They may be advanced toward coincidence with the disc radius or
retarded away from it. Further, blade lengths are not all equal. These adjustments aff ect the spread pa ern in the
following ways:
1. Advance long blades--more material to the outside of spread pa ern; also will increase spread pa ern
width.
2. Retard long blades--opposite eff ect of above.
3. Advance short blades—helps eliminate problem of streaking in the middle of spread pa ern.
4. Retard short blades—puts more material in the center of spread pa ern.
5. Extend blades away from center of spinner—increases spread width somewhat.
6. Retract blades (more towards center of spinner)—opposite eff ect of above.
7. Moving fl ow divider (or chute) toward the front of spreader will tend to put more material in center of
spread pa ern. This is because material is deposited on outer edge of spinner causing it to leave earlier.
8. Moving divider toward the rear of the spreader has the opposite eff ect.
DISTRIBUTOR BLADE TUNING
14
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