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Mechanical Power
Transmission

  • Rebuild worn shafts, keyways, couplings, and gearbox housings to precise tolerance
  • Chock and grout drives correctly
  • Allow power to transmit free of play or vibration
The Challenge

Every drive train depends on tight tolerances. Shaft seats spin, keyways elongate, coupling bores wear, and gearbox housings go out of true — and once play develops, vibration, heat, and secondary damage cascade through bearings, seals, and gears. Welding and re-machining introduce heat distortion, while replacement of shafts and housings carries long lead times.

A Real Rumford Example
Worn metal shredder shaft at the bearing and seal area Before
The Problem
Worn Metal Shredder Shaft

The shaft was badly worn at its bearing and seal area. Pulling it to weld and machine was quoted at about $10,000 and roughly a week of downtime.

Hover for Belzona repair →
Shredder shaft rebuilt in place with Belzona 1111 After — Belzona
The Solution
Rebuilt In Place With Belzona 1111

Rebuilt in place with Belzona 1111 (Super Metal) against a mold former, restoring the original diameter without removal, welding, or machining.

About $3,000 saved · back in service in one day, not a week

Read the full case history →

Outcomes vary by component, load, and access — contact Rumford Industrial Group for a project-specific assessment.

Shafts, keyways and splines, coupling hubs and bores, gearbox and bearing housings, and drive baseplates all wear where torque is transmitted. Fretting, spinning fits, and misalignment open clearances that no amount of tightening will close.

Belzona machinable composites rebuild worn drive components back to original dimensions at ambient temperature, and precision chocking compounds grout drives and motors for correct, stable alignment. Applied in situ by Rumford Industrial Group, they restore fit and alignment without heat distortion or long lead times.

Belzona Solutions for This Application
Shaft & Keyway Repair
Repairing and rebuilding damaged, scored shafts and oversized keyways in situ.
Bearing, Bushing & Housing Repair
Rebuilding bearing locations, seats, and low-friction surfaces, plus reforming ball joint housings, realigning oversized pin housings, and reseating bushes, all without machining.
Corrosion Protection
Protecting exposed areas and surfaces from corrosion attack and pitting.
Coupling & Drive Component Repair
Repairing elongated coupling bolt and dowel locations and rebuilding drive faces.

Specific Belzona product recommendations available on request — contact Rumford Industrial Group for a free technical consultation.

What Belzona Can Do for Mechanical Power Transmission
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Rebuild damaged shafts using machining techniques
Apply machinable metal repair composite to worn shaft sections, then machine back to original dimension and tolerance.
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Rebuild damaged shafts using forming techniques
Form the repair in place with a release-treated former or split mould — no lathe or machine shop required.
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Repair scored hydraulic rams
Fill and smooth scoring on ram surfaces so seals stop tearing and leaking past the rod.
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Rebuild oversize keyways
Rebuild elongated or hammered keyways to a correct interference fit, removing backlash and fretting.
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Rebuild spline couplings
Recast worn splines against the mating part so load is shared evenly across every tooth.
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Rebuild bearing housings using machining techniques
Rebuild ovalised or worn housing bores, then machine to the required bearing fit.
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Rebuild bearing housings using forming techniques
Use the bearing itself, release treated, as the former to create a perfectly matched seat in situ.
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Reseat pins and bush housings
Realign and reseat pins or bushes into oversized, worn housings without welding or line boring.
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Repair and create bearing surfaces
Cast or repair low-friction bearing surfaces where original material has worn or been lost.
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Cast water-lubricated bearings
Cast bearings suited to water-lubricated service, including wet-end and marine applications.
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Repair elongated coupling bolt & dowel locations
Rebuild elongated bolt and dowel holes so fasteners locate correctly and stop working loose.
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Rebuild drive faces of flange couplings
Restore worn or fretted flange drive faces to full, even contact across the joint.
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Rebuild & repair tapered couplings
Rebuild damaged tapers so hubs seat fully and transmit torque without slip.
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Cast flexible coupling inserts
Cast replacement elastomer inserts on site when spares are unavailable or lead times are long.
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Cast pin & bush coupling rubber inserts
Recast rubber bush inserts for pin-and-bush couplings to restore cushioning and reduce shock loading.
See it on our interactive Solution Maps

See how drives, couplings, and rotating equipment are repaired and aligned in Belzona's interactive industry maps.

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