20
Jr.
Sodcutter
MAINTENANCE
BLADE DRIVE CHAIN REPLACEMENT
NOTE:
To prevent small components from falling
down into oil cavities and causing damage
to unit, cover opening with clean rags,
cardboard, etc.
1. Follow steps 1 thru 6 in drive chain removal
section.
2. Remove bottom screw on bearing cage to drain
oil from rear cavity.
3. Rotate pulley shaft until master link is to front of
top sprocket. Remove master link.
4. Rotate blade drive shaft until chain is free.
5. Install new chain in reverse procedure. Use 3M
Scotch Grip 847 or an equivalent adhesive on
case cover and bearing retainer screw.
UPPER DRIVE SPROCKET & SHAFT
1. Follow steps 1 thru 6 in drive chain removal
section.
2. Remove master link from chain. Chain does not
need to be removed from lower sprocket.
3. Remove drive shifter assembly from gear case.
4. Remove blade and side arms from pivot brackets
for easier access.
5. Remove plugs on both ends of shaft.
6. Remove snap rings
B
from left bearing.
7. Using a punch and soft hammer (lead, leather,
etc.), drive shaft out left side of unit and remove
large gear.
8. Using a bearing puller or slide hammer, remove
bearing. Shaft is now removable through cam
case cover opening.
9. Dog clutch half is removable from gear by
removing snap ring.
10. Assemble in reverse procedure.
11. After installing blade shifter assembly, adjust
dog clutch to provide .015" (0.39 mm) clearance
between clutch faces, as shown.
12. Apply 3M Scotch Grip adhesive or an equivalent
to gear case cover before installation.
.015
(0.39 mm)
