Parts for 13BL78ST099 — MTD

We found 66 parts confirmed to fit the MTD 13BL78ST099.

Compatibility table

Prices shown are an informational reference range only, not an offer or an Amazon price — RepairKitHub does not sell parts directly. Each part links to an Amazon search so you can compare current listings yourself.

Common failure areas on this model

The confirmed parts above group into a handful of failure areas. Here is what each points to and how to check it before you order anything.

General hardware and mounting parts

Symptom: A small mechanical or mounting part has failed, cracked, or gone missing.

Check: Compare the physical shape and mounting points to the original piece, and confirm the exact part number against your model plate before ordering.

Parts in this group on 13BL78ST099: 777D18558 (Lawn Mower Decal), 777X46404 (Decal), 78306807A (Stop Pedal Plate), 73504272 (Troybilt Lawn Tractor Brake Pedal Pad), 777D17036 (Lawn Mower Decal), 777D17039 (Decal), 777D17043 (Decal), 777X46245 (Decal), 75308029 (Kmart Lawn Tractor Drive Pedal Shaft), 777D15648 (Lawn Mower Decal), 777D15649 (Lawn Mower Decal), 777I25080 (Lawn Mower Decal), 777X44950 (Lawn Mower Label), 777X44365 (Lawn Tractor Decal, Right), 68304619A0691 (Lawn Tractor Hood), 73107711A (Lawn Tractor Hood Scoop, Left), 634050670961 (Lawn Tractor Wheel Assembly), 93108542C (Dash), 777D17042 (Decal), 777S33896 (Decal), 777D15546 (Kmart Lawn Mower Label), 777I23364 (Lawn Mower Label), 68304649A0637 (Lawn Tractor Chassis), 68304649B0637 (Lawn Tractor Chassis), 777I23754 (Lawn Tractor Decal), 777X44366 (Lawn Tractor Decal, Left), 78304587D0691 (Lawn Tractor Fender, Left), 73109253 (Shift Lever), 777I23592 (Decal), 64704096A0637 (Lawn Tractor Blade Engagement Lever Assembly), 777S33818 (Lawn Tractor Craftsman Decal), 777I22454 (Lawn Tractor Fender Decal), 62505001 (Key Assembly), 95105956 (Lawn Tractor Muffler).

Drive system (belts, pulleys, motors)

Symptom: A drum or tub that won't turn, a burning-rubber smell, or a loud thump or squeal during a cycle.

Check: With power off, turn the drum or tub by hand -- resistance or grinding points to the motor or a bearing, and a cracked, glazed, or snapped belt is visible once the cabinet is open.

Parts in this group on 13BL78ST099: 73204909 (Lawn Tractor Idler Arm Return Spring), 74705596 (Troybilt Idler Adjustment Rod), 78306592A (Lawn Tractor Idler Arm Bracket), 74705323 (Lawn Tractor Belt Keeper), 78307236 (Lawn Tractor Cap Pulley), 78307183A (Lawn Tractor Belt Keeper), 78307234 (Lawn Tractor Blade Idler Pulley Arm), 78307183A0637 (Lawn Tractor Deck Belt Keeper), 95404208 (Lawn Tractor Transaxle Belt, 2/3 x 40-9/10-in), 75308068 (Lawn Mower Idler Pulley), 9540467A (MTD Lawn Tractor Ground Drive Belt, 2/3 x 90-4/5-in).

Storage, trim and cosmetic hardware

Symptom: A cracked shelf, broken door bin, worn hinge, or missing trim piece -- cosmetic and storage wear rather than a functional breakdown.

Check: Match the physical dimensions and mounting tabs of the old part before ordering; these pieces are often model-specific even between visually similar models.

Parts in this group on 13BL78ST099: 74705415 (Troybilt Lawn Tractor Transaxle Bypass Rod), 78306769 (Troybilt Bracket), 7101858A (Troybilt Lawn Tractor Screw), 78306088A0637 (MTD Lawn Tractor Seat Pivot Bracket), 78306088A0665 (Bracket Seat), 68304730A0709 (Lawn Tractor 46-in Deck Housing), 783068400637 (Lawn Tractor Seat Pan), 73204840 (Lawn Tractor Torsion Spring), 74804272 (Lawn Mower Spacer), 68304730A (Lawn Tractor 46-in Deck Housing), 93107668 (Lawn Tractor Grille), 783065984043 (Lawn Tractor Grille, Lower), 74804272A (Spacer Shield), 64704096A (Troybilt PTO Handle Assembly).

Controls, timers and wiring

Symptom: A cycle that doesn't advance, an unresponsive display, or the unit not starting at all.

Check: Look for burn marks or a burnt smell near the board or terminals, and check whether buttons and knobs respond -- a unit that powers on but won't cycle often traces back to this group.

Parts in this group on 13BL78ST099: 72505277 (Lawn Tractor Wire Harness).

Before you buy

Match 13BL78ST099 exactly against the model and serial plate on the appliance itself before ordering anything — a single mismatched character can point to a different production run with different parts. Then check the part number printed or stamped on the part you are replacing against the part numbers in the table above; the printed number is the most reliable way to confirm fitment when a model has gone through multiple production runs. RepairKitHub does not sell parts directly — every part link above routes to an Amazon search for that part number so you can compare current listings and sellers yourself.

How to confirm this is your model

Check inside a door opening, on a back or side panel, or behind a removable panel or drawer for a label printed with the model and serial number. Match every character exactly, including letters and dashes at the end — appliance model numbers often have similar prefixes but different suffixes for different production runs.

Other models with this exact parts list

Each model below is confirmed to share the identical compatible-parts list with this one.

• 13BL78ST299 — 15 parts
• 247288862 — 20 parts

Still not sure?

Use the model lookup tool to search by model or part number, or start from the symptom your appliance is showing.