MacDon 3020 Pull-Type Windrower - Manual (Page 60)

49
MAINTENANCE/SERVICE
MAIN DRIVES (continued)
Main Drive Belt Tension
IMPORTANT: To prolong belt and drive life, do not
over tighten drive belt. Operate at minimum
tension required to prevent slipping and excessive
vibration. Recommended tension: 20 lbs. (90 N)
force at mid-span (C) produces 1 inch (25 mm)
deflection.
To adjust:
1. Loosen three nuts (A), leaving them finger tight.
2. Turn bolt (B) to adjust tension. Rotate clock-
wise to increase tension, counter-clockwise to
reduce tension.
3. Tighten nuts (A).
Removal of Main Drive Pulley
Should it be necessary to remove pulley from main
drive shaft, proceed as follows:
1. Remove shield (A).
2. Remove three 3/8 bolts securing pulley (B) to
triangular plates (C) and (D). Remove plate (C).
3. Remove paint from shaft in front of pulley at
(E).
4. IMPORTANT: Using a 1-1/4 inch (32 mm) I.D.
tube (F) against pulley hub (G), drive the pulley
further onto the shaft to expose key (H).
Remove key.
5. Remove pulley from shaft, using 3/8 bolts (J)
and triangular plates (C) and (D) as a puller.
Add spacers (K) as required for pulling.
EXPOSE AND REMOVE KEY
CHECKING BELT TENSION
REMOVE SHIELD AND BOLTS
REMOVE PULLEY
MAIN DRIVE BELT TENSION ADJUSTMENT
A
B