MacDon 922 - Manual (Page 57)

Form # 46620 Issue 01/06 55
MAINTENANCE/SERVICE
AUGER AND AUGER DRIVE (continued)
Auger Speed - 912 Header
The auger drive is factory assembled for auger
speed of 210 rpm. Auger speed may be slowed to
186 rpm by changing pulley (F). The alternate
pulley is available from your dealer.
NOTE: Installing alternate pulley to slow auger
speed will also slow reel speed from 71 rpm
standard to 63 rpm.
Auger Primary Drive Belt - 912 Header
To adjust auger primary drive belt tension:
1. Loosen two nuts (G) at drive support plate.
2. Loosen nut (H) at mounting arm.
3. Back off jam nut (J) on adjuster bolt.
4. Turn nut (K) counter-clockwise to tighten auger
drive belt until a force of 20 lbs. (92 N) deflects
belt 1/2 inch at mid-span (L).
5. Tighten nuts (G), (H) and (J) to secure the
position.
6. Check and adjust auger drive chain tension as
required, (see below).
Auger Drive Chain – 912 Header
To adjust auger drive chain tension:
1. Loosen nut (N).
2. Slide idler sprocket forward in slot until chain
deflection is 1/4 inch (6 mm) at mid-span.
3. Tighten nut (N) to secure the position.
Auger Speed - 922 & 933 Headers
The auger speed is factory set at 205 rpm with a 9-
3/4” (248 mm) O.D. pulley for the 922 Headers &
16’ 933 Header and 170 rpm with a 11-3/4” (299
mm) O.D. pulley for the 12’ & 14’ 933 Grass Seed
Headers.
The change in auger speed is accomplished by
changing the driven pulley (A) at the auger gear
drive. The alternate pulleys are available from your
dealer.
Auger Drive Belt Tension - 922 & 933 Headers
To adjust auger drive belt tension:
1. Loosen jam nut (C) on adjuster bolt.
2. Turn nut (D) clockwise to tighten auger drive
belt until a force of 12 lbs. (55 N) deflects belt
(E) 1/2" (13 mm) at mid-span.
NOTE: Adjustment of double sickle drive belts will
require loosening the auger drive belt prior to the
adjustment, and re-tightening afterwards.
AUGER DRIVE CHAIN - 912 HEADER
N
AUGER DRIVE BELT
922 & 933 HEADERS
A
E
C
D
AUGER DRIVE BELT - 912 HEADER