Rossi Gearbox Repair in Fontana

Gear shop · Rossi

Heavy helical and bevel drives rebuilt around their housings

Rossi reducers in extruder service carry a signature load case - steady high torque plus the axial thrust of the screw arriving through the output shaft - so thrust bearing condition and output-shaft fits get particular attention at our teardown. Mining and aggregate units present differently: shock loading brinells bearings, dust defeats seals, and tooth roots show fatigue cracking at the mesh that carries start-up torque. In every case we document gear tooth contact and wear, backlash per stage, bearing bores in the housing, shaft journals and keyways, and labyrinth and seal condition, then quote from the record. Gearing beyond limits is manufactured new in-house to the original module, helix and centre distance so the Rossi housing, ratio and mounting pattern are preserved; bores are restored by sleeving or line boring, and backlash and bearing preload are set to specification at assembly, not left to feel. Heavy reducers are lifted, split and reassembled with the housing distortion checked at each stage, because a large cast case that has lived under torque for twenty years does not always close back onto its original alignment without verification. Shim packs are measured and recorded rather than reused by habit, gear contact is proven with marking compound across both flanks, and the finished drive is spun and listened to through its speed range before load testing, with the contact photographs filed to the job so a future inspection can compare wear progression against a known-good baseline instead of guessing from memory.