MacDon 3020 Pull-Type Windrower - Manual (Page 58)

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MAINTENANCE/SERVICE
MAIN DRIVES
Main Drive Belt Alignment
IMPORTANT: Maintenance of proper belt align-
ment is critical to preventing the belt from rolling
over in operation, causing premature failure.
For proper belt alignment, the forward edge of top
idler pulley (A) must be in line with front surface of
drive pulley (B).
To adjust:
1. Place straight edge (C) across front side of
drive pulley (B).
2. Straight edge should contact forward edge of
top idler pulley (A) while staying flush on side of
pulley (B).
3. If not, loosen nuts (E), (F), (G) and (H), leaving
them finger tight. Turn nut (J) to bring pulleys
into alignment.
4. Tighten nuts (E), (F), (G) and (H).
5. Check idler pulley shield alignment, (see
below).
Idler Pulley Shield Alignment
To minimize vibration and prolong belt life, be sure
pulley shields are aligned to center the belt
entering and leaving the shield.
To adjust:
1. Loosen locknuts (A).
2. Position the shields so the belt clearances at
points (B), (C) and (D) are the same. Be sure
belt does not rub shield at any point.
3. Tighten locknuts (A) to 80 to 90 ft.lbs. (110 to
120 N ⋅m) to secure the position.
NOTE: Insert punch (E) when tightening locknuts
to maintain alignment.
MAIN DRIVE BELT ALIGNMENT
IDLER PULLEY SHIELD ALIGNMENT