Drill Press Replacement Motor 115.5454: Diagnose the Fit Before Replacing Anything
The number 115.5454 is a Sears prefix, the giveaway that you are working on an older Sears or Craftsman built press, and it is the key to finding the right motor. Before you buy a drill press replacement motor for a 115.5454 machine, diagnose the fit, because that prefix identifies the press so you can cross-reference the original motor’s specs rather than guessing at a modern universal unit.
The motor is the single-phase electric drive that turns the spindle through the belt. On a 115-prefix Sears press it bolts to a bracket and wires through a switch, so a correct replacement matches the shaft, mounting, power rating, and wiring of the original, not just its horsepower.
Short answer: use the 115.5454 number to look up the original motor’s specs, confirm the motor is actually dead rather than a bad capacitor or switch, then match shaft diameter, RPM, horsepower, frame, and voltage to the replacement.
Start with the number
The 115 prefix means Sears can identify this press, and that is your advantage:
- Look up the model to find the original motor’s horsepower, RPM, shaft, and frame.
- Note the mounting style and bracket, since a Sears bracket may not match a modern motor base.
- Record the voltage and wiring so the replacement wires up and turns the right way.
Diagnose before buying
- Hums but spins by hand: a failed start capacitor, a far smaller fix than a motor.
- Silent: check the switch and cord first.
- Burned smell or tripped breaker: the motor itself is likely finished.
The replacement to match against
Once the number tells you the specs and the motor really is dead, a 1/2 HP 1725 RPM single-phase motor is a common size for these Sears presses and a solid target to match your original against. Confirm the shaft diameter, frame, and mounting before ordering.
The honest drawback: an older Sears bracket rarely matches a modern universal motor base exactly, so expect to adapt the mount or change the pulley if the shaft size differs. Who should skip a new motor: anyone whose fault is the capacitor or switch.
Fitting it, step by step
- Unplug the press.
- Confirm the diagnosis, capacitor, switch, or motor.
- Record the old motor’s shaft, RPM, horsepower, frame, and voltage.
- Remove the belt, unbolt the old motor, and transfer the pulley if the shaft matches.
- Bolt on the matched motor, wire it correctly through the switch, and set belt tension to about half an inch of deflection.
Let the number guide the match
Replacing the motor on a 115.5454 press is easier than most because the Sears number identifies the original specs. Use it to cross-reference, confirm the motor is truly dead, and match the five specs, expecting to adapt an older bracket.
Three takeaways:
- Use the 115.5454 number to look up the original motor’s specs.
- Rule out the capacitor and switch before replacing the motor.
- Match shaft, RPM, horsepower, frame, and voltage, and expect to adapt the mount.
FAQ
What does the number 115.5454 mean? The 115 prefix identifies a Sears-built press, which lets you look up the original motor’s specifications to match a replacement accurately.
How do I find the original motor specs? Look up the 115-prefix model through Sears parts resources to find the horsepower, RPM, shaft, frame, and voltage of the original motor.
How do I know the motor is dead? If it hums but spins by hand, suspect the capacitor. If it is silent, check the switch and cord. A burned smell points to the motor itself.
Will a modern motor bolt onto an old Sears bracket? Rarely a perfect match. Expect to adapt the bracket or change the pulley if the shaft diameter differs from the original.
Do I need to match the RPM? Yes. The speed chart assumes 1725 RPM, so a different speed changes every setting.
Can I wire the new motor to the old switch? Usually yes, if voltage and phase match. Wire it correctly through the existing switch and confirm the rotation direction.
References
- Sears PartsDirect, Craftsman and Sears drill press parts and diagrams: 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
