MacDon 3020 Pull-Type Windrower - Manual (Page 31)

20
OPERATION
REEL SPEED
Reel speed affects the smoothness and evenness
of the windrow. Operating the reel too fast or too
slow relative to ground speed will cause bunching
in the windrow.
In standing crop, reel speed should be just faster
than ground speed to sweep the crop across the
sickle.
A faster reel speed may be necessary in leaning or
down crop.
Excessive shattering of grain heads may be an
indication that reel speed is too fast.
Reel speed is variable from 27 to 50 rpm, over two
speed ranges.
To adjust speed within a range:
1. To reduce speed, move shims at (A) from
outside to between pulley halves.
2. To increase speed, remove shims from
between halves and store outside pulley.
To change speed range, replace outer pulley half
(B) as follows:
1. Remove nut (C), shims at (A) and outer pulley
half (B).
2. Remove pulley half (D) under main drive shield
and store the pulley half removed in Step 1.
3. Install new pulley half on drive shaft, position
shims as required, and secure with nut.
NOTE: The smaller diameter pulley half is used for
the low speed range. The larger diameter pulley
half is used for the high speed range.
REEL SPEED ADJUSTMENT
A C
B
STORAGE OF PULLEY HALF
D