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Heavy Duty Finishing Mower
39
MOWER DECK BELT ADJUSTMENT
Start by removing both belt guards on the mower deck. Loosen the bolts holding the
gearbox base plate (#7). Turn the 5/8” hex nuts (#6) on the threaded rod on the base
plate until there is enough slack in the belts to slip them off the spindle pulleys. If the
belts can be pulled off by sliding them under the large double pulley, no further
disassembly is required. If this is difficult, you can create more space by removing the
bolts holding on the gearbox mounting plate (#8) in one piece with the gearbox and
large pulley. Lift up the mounting plate assembly slightly and slide the belts underneath.
When you replace the belts, make sure they are lined up as shown in the drawing. The
upper groove in the double pulleys goes around the higher of the single pulleys. The
lower grooves of the double pulleys line up with the lower single pulley. Re-tighten the
belts so the center of the belt span will deflect about ½” with nominal pressure. Do not
forget to tighten the bolts on the gearbox mounting plate.
MOWER DECK BELT ADJUSTMENT
ITEM PART# DESCRIPTION
1 912300158 Gearbox Assembly
2 81592 3/8'' Hex Nut (pl)
3 81593 3/8'' Lock Washer (pl)
4 964001 7/16'' ID x 10 Ga Washer (pl)
5 86182 3/8'' x 1 1/4'' Carriage Bolt (pl)
6 81676 5/8'' Hex Nut (pl)
7 980004200 Gearbox Base Plate
8 906343 Gearbox Mount Plate
9 904245 4 1/2'' Single Sheave (Machined End Up) (5' & 6')
904247 7'' Single Sheave (Machined End Up) (7')
10 904246 4 1/2'' Double Sheave (5' & 6')
904248 5 1/4'' Double Sheave (7')
11 966722 12'' Double Pulley (1.25'' Bore)
12 904251 B-70 Belts (5')
973506 B-78 Belts (6')
973248 B-87 Belts (7')
13 902667 5' Rear Discharge Deck
902668 6' Rear Discharge Deck
902669 7' Rear Discharge Deck