AMT 3682-140-90 Pedestal Shaft and Ball Bearing Assembly
The AMT 3682-140-90 is the genuine pedestal shaft and ball bearing assembly for AMT pumps — a complete, factory-built rotating unit combining the pedestal shaft with its ball bearings, ready to drop into the bearing housing.
A pedestal pump puts a lot of faith in this one assembly. Unlike a close-coupled pump, where the motor’s own bearings carry the impeller, a pedestal design has its own bearing set doing all the work: carrying the impeller out over the suction, absorbing the radial load from the volute and the axial thrust from the impeller, and holding the shaft concentric so the mechanical seal has a true running surface. When those bearings degrade, everything downstream of them degrades too.
The symptoms follow a familiar pattern — a growl or rumble from the pedestal, a shaft that feels gritty when turned by hand, measurable end play, heat through the housing, and a mechanical seal that will not stay sealed no matter how many times you change it. Fit the assembly complete, renew the seal at the same time, and inspect the housing bore for damage before assembly. AMT builds several pedestal assemblies that differ in shaft length, thread and keyway, so confirm the part number against your parts breakdown.
Key Features
- Genuine AMT (Gorman-Rupp) service part — factory-built to the original specification
- Complete pedestal shaft and ball bearing unit — ready to fit, no pressing required
- Carries the impeller and absorbs both radial and axial pump loads
- Restores concentricity so the mechanical seal runs true
- Ends the repeat seal failures caused by worn pedestal bearings
Applications
- AMT pedestal pump rebuild work
- Repairing a pedestal that growls, runs hot or shows shaft end play
- Correcting repeat mechanical seal failures on a pedestal pump
- Restoring impeller clearance and concentricity
- Marine, dockside, dewatering and general water transfer service
Specifications
- Brand: AMT (Gorman-Rupp)
- Manufacturer Part Number: 3682-140-90
- Part Type: Pedestal shaft and ball bearing assembly
- Supplied: Complete pre-assembled unit
- Quantity Used Per Pump: 1
- Condition: New
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct shaft and bearing assembly before you order.
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