Craftsman 8-Inch Drill Press Motor Replacement: The Checks That Prevent a Bad Repair

The fastest way to waste a weekend is to order a motor for your Craftsman 8 inch drill press, bolt it on, and discover the shaft is the wrong size or the base does not line up. A Craftsman 8 inch drill press motor replacement is a straightforward job, but only after a handful of checks that separate a genuinely dead motor from a bad capacitor, and a matching motor from a near-miss.

The motor is the electric drive that turns the spindle through the belt. On an 8 inch Craftsman press it is a small single-phase motor, so a correct replacement matches the shaft, mounting, power rating, and wiring of a compact machine, not the larger motors used on floor presses.

Short answer: confirm the motor is actually failed, then match shaft diameter, RPM, horsepower, frame and mounting, and voltage. On a small 8 inch press the motor is modest, so do not oversize it blindly.

The checks that prevent a bad repair

1. Is the motor really dead? A press that hums but spins by hand usually has a failed start capacitor, not a dead motor.
2. Shaft diameter. The existing pulley must fit the new shaft.
3. RPM. Drill press motors typically run 1725 RPM; the speed chart depends on it.
4. Horsepower and frame. An 8 inch press uses a small motor. Match the rating and the compact frame so it fits the bracket.
5. Voltage and rotation. Match your outlet and confirm the direction of rotation.

Do not oversize the motor blindly

This is where 8 inch owners go wrong: they grab a larger 1/2 HP motor because it is common, without checking the frame. A 1/2 HP 1725 RPM single-phase motor is a reliable unit and a fine target to match specs against, but only if its shaft and mounting match your small press. Measure your bracket and shaft first.

The honest drawback: a larger motor can be heavier and physically bigger than the original 8 inch mount expects, and a shaft size change means a new pulley. Who should skip a new motor entirely: anyone whose press only needs a capacitor or switch.

Step by step

1. Unplug the press.
2. Confirm the diagnosis: hums and spins by hand points to a capacitor; silent points to the switch or cord.
3. Note the old motor’s shaft, RPM, horsepower, frame, and voltage.
4. Remove the belt, unbolt the old motor, and transfer the pulley if the shaft matches.
5. Bolt on the matched motor, wire it correctly, and set belt tension to about half an inch of deflection.

Check first, match the small frame, then swap

Craftsman 8 inch motor replacement goes smoothly when you confirm the motor is dead and match a compact motor to the shaft, frame, and voltage. Resist the urge to oversize, and the swap is clean.

Three takeaways:

• Rule out a bad capacitor before replacing the motor.
• Match the small frame and shaft; do not oversize blindly.
• A shaft size change means you also need a new pulley.

FAQ

How do I know the motor on my Craftsman 8 inch press is dead? If it hums but the spindle spins freely by hand, suspect the start capacitor. If it is silent, check the switch and cord first.

What size motor does a Craftsman 8 inch drill press use? A small single-phase motor at 1725 RPM. Confirm your model’s exact horsepower, shaft, and frame before buying.

Can I put a bigger motor on an 8 inch press? Only if the frame, shaft, and mounting fit. A larger motor may not bolt to the small bracket, and it changes the balance of the machine.

Why will not my pulley fit the new motor? The shaft diameter differs. Match the shaft, or fit a pulley bored to the new shaft size.

Do I need to match the RPM? Yes. The speed chart assumes 1725 RPM, so a different speed changes every setting.

Is the capacitor a smaller repair than the motor? A capacitor is a much smaller repair, so rule it out first before committing to a new motor.

References

• Sears PartsDirect, Craftsman drill press parts and manuals: https://www.searspartsdirect.com
• Grizzly Industrial, drill press motor specifications reference: https://www.grizzly.com/products/grizzly-motor-1-2-hp-single-phase-1725-rpm-odp-110v-220v-for-g4008-09/h5373