Spiral Bevel Gear Set Replacement for Makita 9553NB 9554NB 9555NB 9557NB 9558NB Angle Grinder – Aftermarket Repair Part

Replacement Spiral Bevel Gear Set for Makita Angle Grinders (Aftermarket, Non-OEM)This spiral bevel gear set replaces worn or damaged gears inside compatible Makita angle grinders. The gears transfer power from the motor to the spindle and change the direction of rotation, allowing the grinding wheel to operate smoothly and efficiently.Over time, gears wear from high rotational speeds and normal mechanical use, which may cause power loss, rough operation, or abnormal noise. Replacing worn gears helps restore normal grinder performance without replacing the entire tool. Common Signs Your Gears May Need ReplacementGrinding or rattling noise from the gear housingReduced cutting power or torqueWheel spinning slower than normalSlipping or uneven rotationIncreased vibration during operationReplacing worn gears helps restore normal grinder operation so cutting and grinding tasks can be performed smoothly again. Compatibility & Fit VerificationCompatible with Makita models: 9553NB, 9554NB, 9555NB, 9557NB, 9557PB, 9558NB, 9558PB, 9553HN, 9555HN.Replaces part numbers: 227541-3, 227542-1, 227471-8Specifications (approx.)Inner diameter: 12mmOuter diameter: 48mmHeight: 15mmLarge gear: 37 teethSmall gear: 10 teethConfirm model number and key dimensions before purchase. Installation OverviewInstallation involves opening the gear housing, replacing the worn gears, and reassembling the tool using basic hand tools such as hex keys and screwdrivers. Always unplug the grinder before servicing. Package Includes1 × Drive gear1 × Driven gear (matched pair) Important NoteDesigned to match the fit and function of the original gear set for compatible models. This is an aftermarket replacement part (Non-OEM). Brand names are used only to indicate compatibility and do not imply affiliation or endorsement.

• Restore Power & Smooth Operation — Replaces worn spiral bevel gears causing grinding noise, vibration, slipping, reduced rotation speed, or loss of cutting power
• Complete Matched Gear Set — Includes 1 drive gear and 1 driven gear engineered to mesh properly and deliver reliable power transfer in compatible Makita angle grinders
• Compatible Models — Fits Makita 9553NB, 9554NB, 9555NB, 9557NB, 9557PB, 9558NB, 9558PB, 9553HN, 9555HN; replaces part numbers 227541-3, 227542-1, 227471-8
• Verify Dimensions Before Ordering — 12mm inner bore, 48mm outer diameter, 15mm height (approx.); compare measurements with your original gears
• DIY Repair Friendly — Moderate installation using basic hand tools such as hex keys and screwdrivers; suitable for users with basic mechanical skills