Once your Dover gearbox arrives at our facility we disassemble, clean, inspect and measure all gears and shafts and determine if your Dover gears and shafts are qualified to be repaired. If the Dover gears and shafts are not repairable, we have the capabilities and expertise to manufacture all new Dover gears and shafts such as Helical, Double Helical, Herringbone, Split Herring bone, Bevel, Spiral Bevel, Spur Gears, Ring Gears, Eternal Ring Gears, Rack & Pinion, Worm Gears, Double Enveloping Worm Gears, Hypoid Gears, Screw Gears, Plus More! Once your Dover gearbox is repaired we then do a six hour test run for overheating, vibration, and leaking to ensure our 24 Month Guarantee. National Gear Box Repair can do all of these repairs and rebuilds at a considerable amount of saving rather than buying a new Dover gearbox.