Hard
More than 2 hours
Seal-oil 721-04612
OEM part for: MTD, Cub Cadet, Troy-Bilt
Part Number: 721-04612
$5.25
In Stock
Ships within 1 business day 
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Compatibility
This Seal-oil will fit the following 193 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Cub Cadet
MTD
Troy-Bilt
Show More Compatible ModelsThis item works with the following types of products:
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Main drive shaft broke on a Cub Cadet 42" 3 stage tractor mount snow thrower
Brian - March 12, 2024
Tool Type
Snowblower
Difficulty
Hard
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Power Drill, Socket set, Wrench Set, Nutdriver, Adjustable Wrench, Big Hammer
Removed front section of blower from the tractor mount and pulley housing, disassembled snow chute.
Removed auger assembly and transmission from thrower box.
Removed augers from shafts, disassembled transmission.
Cleaned and inspected gears, replaced drive shaft, seals and main bearing (was damaged in breakage).
Heavily greased shafts to prevent augers from rusting solid (which is what caused the shaft to snap, as the break-off bolts were rendered inoperable because drive shaft was rusted to rear auger).
Cleaned, lubed, reassembled and tested.
Replaced transmission gear oil with 75w-95 full Synthetic.
Tip: Get a good pair of snap ring pliers. I wasted probably an hour of time trying to get the C rings off and back in the transmission housing with junk $8 pliers that kept falling apart!
Removed auger assembly and transmission from thrower box.
Removed augers from shafts, disassembled transmission.
Cleaned and inspected gears, replaced drive shaft, seals and main bearing (was damaged in breakage).
Heavily greased shafts to prevent augers from rusting solid (which is what caused the shaft to snap, as the break-off bolts were rendered inoperable because drive shaft was rusted to rear auger).
Cleaned, lubed, reassembled and tested.
Replaced transmission gear oil with 75w-95 full Synthetic.
Tip: Get a good pair of snap ring pliers. I wasted probably an hour of time trying to get the C rings off and back in the transmission housing with junk $8 pliers that kept falling apart!
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
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