The Castair Replacement Motor Hub with 1" Shaft (LX100) is the part you need when the hub connecting your electric motor to the compressor pump wears out or fails. This is a direct replacement part for Cast Air compressor assemblies that use a 1" motor shaft diameter. Getting the shaft size right is critical — use LX100 only when your motor shaft measures exactly 1" in diameter. The wrong hub size won't seat properly and can damage the motor shaft, the hub itself, or the pump coupling.
What the Motor Hub Does
The motor hub is the mechanical link between the electric motor's output shaft and the compressor pump's drive mechanism — typically a belt sheave or direct-drive coupling. When this part wears, develops play, or cracks, the motor and pump fall out of alignment. That causes belt slap, vibration, accelerated wear on both the motor bearing and the pump, and eventually a compressor that won't build pressure reliably. Replacing the hub before it fails completely prevents a much more expensive repair.
Key Features
- 1" Shaft Bore: Fits motor shafts with a 1" diameter — verify your motor shaft size before ordering
- Cast Air OEM Part: Designed specifically for Cast Air compressor assemblies — correct fit without modification
- Precision Machined: Proper bore tolerance ensures a secure, concentric connection between motor and pump
- Direct Replacement: Drop-in fit for compatible Cast Air units using this shaft configuration
Technical Specifications
- Part Number: LX100
- Shaft Diameter: 1" (1.000")
- Component Type: Replacement Motor Hub
- Manufacturer: Cast Air
- Price: $19.25
Note: Manufacturer's product page was unavailable at time of writing. Confirm compatibility with your specific Cast Air model before ordering. Contact us with your compressor model number for verification.
When You Need This Part
- Motor hub shows visible cracking, wear, or deformation
- Belt is throwing off or running loose despite proper tension adjustment
- Compressor is vibrating more than normal — especially at startup
- Replacing an electric motor on a Cast Air unit and need a new hub to match the new motor shaft
- Scheduled preventive maintenance on high-hour compressors
Selecting the Right Motor Hub
Cast Air offers motor hubs in multiple shaft sizes. Before ordering, measure your existing motor shaft with calipers. The LX series covers several sizes:
- LX58 — 5/8" shaft
- LX78 — 7/8" shaft
- LX100 — 1" shaft (this part)
- LX118 — 1-1/8" shaft
- LX138 — 1-3/8" shaft
If you're unsure which hub fits your unit, call us with your Cast Air model number and we'll confirm the correct part.
Why Buy From OEM Diagnostic Tools?
We've stocked Cast Air replacement parts since 2016 and we know the product line. When you need a motor hub, you need the right one the first time — there's no easy field fix if the bore is wrong. We carry the full LX series hub lineup so you can get the correct part fast, with free shipping on qualifying orders. Our team can help you confirm compatibility before you order.
Call 866-217-0063 for quick answers and help!
