Gear Box Parts
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Sprocket
913-0194
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Original MTD Part
MTD # 713-0194, 913-0194
Sprocket hub assembly
9 & 32 teeth for 2 stage snowblowers

Worm Gear
ORE73-034
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MTD # 717-1425, 917-1425
Worm Gear LH double thread
Fits models: 800 & 900, 28" & 33"
2.870" OD x 1.5" ID x .885 width
20 tooth

Axle
ORE73-035
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MTD # 738-0276
Axle for 2 stage 28" & 33" blowers
Fits models: 800 & 900
7/8" diameter, 19" Length