AMT 1784-003-00 Impeller Lock
The AMT 1784-003-00 is the genuine replacement impeller lock for AMT pumps — the fastener that threads onto the shaft end and clamps the impeller hard against its shoulder so the two turn as a single unit. It is a small part that quietly carries every load the impeller generates.
Consider what it is holding. The impeller is being pushed backwards along the shaft by discharge pressure, twisted by the torque of the motor, and shock-loaded by every solid that comes through the suction. The lock is the only thing resisting all of that. Let it work loose and the impeller starts to shift on the shaft — it frets the shaft end, chews the key or drive flats, drops out of balance and starts vibrating, and in the worst case shears the shaft or destroys the casing it is rubbing against.
Because of that, an impeller lock is not a part to reuse if it has been abused. Replace it if it has been cross-threaded, galled, or rounded off, and always torque it to the figure in your pump’s manual rather than guessing — both under- and over-tightening cause failures. AMT uses several impeller locks with different threads and seating forms across its range, so confirm this part number against your parts breakdown before ordering.
Key Features
- Genuine AMT (Gorman-Rupp) service part — correct thread and seating form
- Clamps the impeller hard against its shoulder so the assembly turns as one
- Resists the axial thrust, torque and shock loading the impeller generates
- Direct replacement for a galled, cross-threaded or rounded-off original
- Fit new with every impeller replacement
Applications
- AMT pump impeller replacement
- Rebuilding a pump where the impeller has worked loose on the shaft
- Correcting vibration caused by a shifting impeller
- Routine pump teardown and reassembly
- Marine, dockside, washdown, dewatering and general water transfer service
Specifications
- Brand: AMT (Gorman-Rupp)
- Manufacturer Part Number: 1784-003-00
- Part Type: Impeller lock
- Function: Clamps the impeller to the shaft shoulder
- 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 impeller lock before you order.
CLRMarine
