Marley Gearbox Repair !free! Jun 2026

I’ve also used two independent shops for other gearboxes (not Marley-brand). Their prices were 40% lower—around $3,800 for a similar rebuild. However, one used a standard bearing that failed at 9 months because the internal clearance was wrong for a cooling tower’s reversing load. Another shop didn’t have the correct fixture to measure gear backlash, so the unit ran hot. You get what you pay for. Marley’s repair is expensive because it’s right .

I checked oil samples at 100 hours and 500 hours. Both came back clean—no elevated iron, no chromium from bearings. The input shaft seal (a common leak point on older Marleys) remained dry. The gearbox has now run 1,800 hours under variable load (ambient temps from 20°F to 95°F) without a single issue. In terms of reliability, this repair returned the unit to “like new” performance. marley gearbox repair

Open the inspection plug and check the oil. If it looks like a metallic "glitter bomb" or smells burnt, the damage is likely internal and extensive. I’ve also used two independent shops for other

Marley gearboxes use shim packs to set the bearing preload and gear mesh. If you kept the original shims organized, start there. If not, you must measure the end-play. Another shop didn’t have the correct fixture to