MacDon 3020 Pull-Type Windrower - Manual (Page 34)

23
OPERATION
DRAPER SPEED
Draper speed affects the orientation of stalks in the
windrow. Faster draper speeds will tend to form
herringbone or dovetail configurations. See
"Windrow Characteristics" in this section.
Draper speed is variable from 275 to 480 feet per
minute (84 to 146 m/min) by shimming. One shim
will change draper speed approximately 19 feet
per minute (6 m/min)
To increase speed, add more shims between
pulley halves.
To decrease speed, remove shims from between
pulley halves.
To change draper speed:
1. Remove four bolts, shims (A) and outer pulley
half (B) at draper drive roller.
2. Reposition shims as required.
3. Replace pulley half, shims and bolts. Store
unused shims outside pulley.
4. Tighten hardware.
NOTE: When a slower draper speed is required
even after removing all shims at draper drive roller
pulley, add shims between pulley halves (C) on
drive shaft. However, for maximum belt life,
extended use of shims at pulley (C) is not
recommended. When increasing speed, always
remove any shims at (C) first.
DRAPER SPEED ADJUSTMENT
A
B
DRIVE SHAFT PULLEY
C
C