Caltric 42" Deck Spindle Bearing Repair kit Compatible with Troy-Bilt 13AB77BS223 13AM77BS023 Pony / 13AL78BS023 13AL78BS223 Bronco

What It Is

The Caltric 42" Deck Spindle Bearing Repair Kit is an aftermarket replacement set for the spindle bearings and housing components on select Troy-Bilt riding mowers. It’s designed to fix a wobbly or noisy spindle that drives the blade on 42-inch cutting decks.

Fitment & Compatibility

Before buying, confirm your mower model number (found under the seat or on the frame). This kit is listed for Troy-Bilt Pony and Bronco models including 13AB77BS223, 13AM77BS023, 13AL78BS023, and 13AL78BS223. It fits 42-inch decks only—not 46 or 50-inch. The OEM spindle part numbers vary, so measure your spindle shaft diameter (typically 5/8” or 3/4”) and bearing housing depth. Caltric is an aftermarket brand; it may differ slightly from OEM Troy-Bilt parts. If your spindle housing is cracked or the shaft is bent, this kit won’t fix that—you’ll need a full spindle assembly.

Key Things to Know

• Build quality: Caltric bearings are generally reliable for the price, but some users report shorter lifespan than OEM bearings in heavy-use situations.
• Installation difficulty: Moderate. Requires removing the deck, blade, spindle pulley, and pressing out old bearings. You’ll need a bearing puller or press, and basic hand tools.
• Common gotcha: The kit includes bearings, seals, and snap rings—but not a new spindle shaft or housing. If the shaft is worn or the housing is ovaled from vibration, the repair won’t hold.
• Lubrication: Pack the new bearings with grease before installation; many aftermarket kits arrive dry.

Should You Buy It

If you have a 42-inch Troy-Bilt Pony or Bronco with a worn but structurally sound spindle, this $13 kit is a budget-friendly fix. It’s best for DIYers comfortable with bearing replacement and who don’t need OEM longevity. Skip it if the spindle housing is damaged or you want a drop-in replacement without pressing bearings.