Pulleys establish the drive ratio and locate the belts. Changing the pulley size can change operating speed and machine loading.
Signs to investigate
Look for cracked rims, worn grooves, damaged bores, looseness or repeated belt tracking problems. These symptoms are clues, not a remote diagnosis. Check the complete assembly and operating conditions before buying a replacement.
Compatibility comes first
Different N90 manufacturers and production periods can use different parts. Confirm the machine nameplate, old component and all critical measurements. Never rely on “N90” alone.
What to measure
Record outside and pitch diameter where specified, bore, keyway, groove profile, groove count, hub and fixing method. Use millimetres and distinguish measured dimensions from estimates. Include quantity and any visible part number.
Photos for identification
Photograph the pulley face, hub, grooves and any markings. Record the existing drive arrangement; do not change the ratio without machine-specific guidance.
Also include a full machine photo and a clear image of the nameplate. If there is no plate, show the drive and the milling chamber from safe positions.
Before replacement
Stop, isolate all energy sources and wait for moving parts to stop. A qualified repairer should perform removal and installation where special tools, alignment or load-bearing assemblies are involved. Follow the exact machine instructions and refit every guard before operation.
Request a matching part
Send your photos, dimensions, required quantity and destination country. We will discuss the appropriate fitment and quotation. Availability and compatibility are confirmed before ordering.