Craftsman Benchtop Drill Press Replacement Pulley: Getting the Right One On
A cracked or wobbling pulley announces itself. The press develops a vibration you feel through the table, the belt starts walking off its step, and if you look close you may spot a hairline split running out from the bore. On a Craftsman benchtop press, a replacement pulley is a quick and satisfying fix, but only if the new one matches the old on the handful of dimensions that actually matter.
The pulley is the stepped wheel that carries belt power between the motor and the spindle, and its steps are what let you change speed. When one cracks, warps, or wears its grooves smooth, the belt cannot grip evenly, and no amount of belt tension will settle it down.
Short answer: match four things when buying a Craftsman benchtop drill press replacement pulley, the bore diameter (the hole that fits your shaft), the number of grooves, the overall diameter, and the spacing of the steps. Get those right and the belt lines up with the spindle pulley exactly as before.
Confirm your Craftsman model first
Craftsman drill presses were built by several makers over the years, so the model number on the machine matters more than the brand. Look for a number that starts with 113, 137, or similar on the label or motor plate. That number is how you confirm parts and how you tell a parts counter which machine you actually have.
The four measurements that matter
- Bore. Measure the shaft the pulley slides onto, commonly 1/2 or 5/8 inch. The pulley bore must match, and it usually has a keyway or a set-screw flat.
- Groove count. Count the steps on the old pulley. A three- or four-step pulley must be replaced by the same, or your speed range changes.
- Overall diameter. The largest step’s diameter sets your slowest and fastest speeds. A different diameter shifts every speed on the chart.
- Step spacing. The grooves must line up with the matching pulley on the other shaft, or the belt runs at an angle and wears fast.
The replacement to use
For most Craftsman benchtop presses, a multi-groove aluminum drill press pulley replaces a cracked or worn stepped pulley cleanly, provided you match it to the four measurements above. Aluminum keeps the rotating weight low, which helps the vibration you were chasing in the first place.
The honest drawback: an aftermarket pulley sometimes ships with a bore that needs a set-screw flat filed or a keyway that does not perfectly match yours, so plan to check the fit before final assembly. Who should skip it: anyone whose old pulley is sound and just needs the grooves cleaned, since a good pulley does not need replacing.
Replace the belt while you are in there
A worn pulley and a tired belt tend to travel together, and a fresh pulley running an old glazed belt will still slip. While the cover is open, a matching Craftsman drill press drive belt pairs well with the new pulley so both wear surfaces start fresh. Confirm the belt length against your old one, since Craftsman used several sizes across models.
Line it up and it will run smooth
A new pulley cures a vibrating, belt-throwing Craftsman press only when it matches the original on bore, groove count, diameter, and step spacing. Confirm your model number, measure carefully, and replace the belt at the same time so the fix actually holds.
Three takeaways:
- Match bore, groove count, diameter, and step spacing before ordering.
- Confirm your Craftsman model number; several makers built these presses.
- Fit a fresh belt with the new pulley so one worn part does not spoil the repair.
FAQ
How do I know my drill press pulley is bad? Look for cracks from the bore, wobble as it spins, or grooves worn smooth and shiny. Any of these lets the belt slip and sets up a vibration you feel through the table.
What bore size does a Craftsman benchtop pulley use? Commonly 1/2 or 5/8 inch, usually with a keyway or set-screw flat. Measure the shaft to confirm before buying.
Do I have to match the number of grooves? Yes. The groove count sets your available speeds. Replacing a four-step pulley with a three-step changes the speed range.
Will a different diameter pulley work? It will run, but every speed on your chart shifts. Match the overall diameter to keep the speeds you expect.
How do I find my Craftsman model number? Check the label or motor plate for a number often starting with 113 or 137. That number identifies the maker and the correct parts.
Should I replace the belt too? Usually yes. A worn belt and worn pulley go together, and a new pulley on an old glazed belt still slips.
How do I get the old pulley off? Back out the set screw, remove the key, and draw it off with a gear puller. Do not hammer, which can bend the shaft.
References
- Sears PartsDirect, Craftsman drill press parts and model lookup: https://www.searspartsdirect.com
