Lufkin Gearbox Repair in Fontana

Gear shop · Lufkin

Pumping-unit reducers judged by tooth contact and backlash

A pumping-unit reducer lives a strange life: fully loaded twice per stroke, reversing torque ripple at low speed, often running for years between oil changes in dust and heat. The wear that follows is distinctive - pitting concentrated on the loaded tooth flanks, backlash grown unevenly between the high-speed and low-speed meshes, crankshaft bearing fits fretted in their housings, and oil seals hardened until the box breathes grit. Our teardown documents tooth condition under magnification, backlash at several positions, bearing and housing-bore measurements, and shaft journals, then the quote follows the evidence: gearing dressed or replaced with new gears cut in-house to the original geometry, housings line-bored where fits have fretted, bearings, seals and breathers renewed throughout. Herringbone sets are matched and timed as a pair, because a Lufkin reducer only runs quiet when its two helices share the load equally. On assembly, oil grade and fill level are set for the reducer's actual mounting attitude, since a pumping-unit box lives tilted through its working arc and starves its upper mesh if the level was guessed for a level bench. Splash systems, oil slingers and any fitted lubrication lines are cleaned and proven before the covers close, breather condition is treated as a wear item rather than an accessory, and the first test run includes a temperature survey across both housings so a tight bearing or a starving mesh announces itself here, under our instruments, instead of alone in the field at midnight.