Final Assembly Notes - MTD 450 Series Shop Manual

For Parts Call 606-678-9623 or 606-561-4983

Final Assembly Notes

Figure 5.72
4. Confirm that all gears, spacers and washers are correctly positioned in the case. Refer to the section of this
chapter that covers any parts in question. Any gears that slip into engagement with other gears should have
beveled tooth facing the gear that they engage with.
5. Lubricate the wheel axle and the tine shafts.
6. Apply a bead of sealant to the mating surface of the lower housing. The sealant must run inside of the fastener
holes in the mating surfaces.
7. Carefully lower the upper case half onto the lower case half.
• After the upper half of the chain case is in place, double nut the shafts so that they can be held against the
tightening force.
• Tighten the lower fastening nuts to a torque of 30 ft-lb. (40 Nm).
• Remove the double nuts for final chain case assembly.
Note sealant under gear
positioning bracket
Figure 5.73
www.mymowerparts.com
1. Clean the sealant residue and any grease from the
mating surfaces of the chain case halves.
See Figure 5.72.
2. Fill the case with 40 oz. (1.2 liters) of Benalene
grease (part number 737-0300A).
• Lubricate the bearing surfaces of any removed
parts with grease.
• 20 oz. (600ml.) of grease goes into the area
around the main shaft, counter shaft, and input
shaft assemblies.
• 10 oz. (300ml.) of grease goes into the area
around the wheel shaft.
• 10 oz. (300ml.) of grease goes into the area
around the tine shaft.
3. Leave the nuts that secure the main shaft, counter
shaft and wheel speed reduction shaft loose until the
upper half of the chain case is installed.
8. Apply sealant around all of the holes in the gear posi-
tioning bracket. See Figure 5.73.
9. Install, but do not fully tighten the fasteners that hold
the gear positioning bracket and idler bracket assem-
bly to the chain case.
10. Install, but do not tighten the following items:
• The nut and Belleville washer on the wheel
speed reduction shaft
• The belt cover bracket
• The perimeter screws that hold the two case
halves together.
• The nut/bolt combinations that hold the case
halves together and secure the tine shield to the
chain case
11. Tighten enough of the fasteners to draw the chain
case halves firmly together.
Chain Case
55