Lovejoy L075 Jaw Coupling Hub, 3/4 in Bore
The Lovejoy L075 is a sintered iron hub, one half of the industry-standard L-Series jaw coupling used to connect motor, pump, and gearbox shafts that are closely but not perfectly aligned. This hub is finished to a 3/4 in bore and secured with a set screw. A complete coupling needs a second L075 hub for the mating shaft and an elastomer spider that fits between the two sets of jaws and transmits torque while absorbing shock and vibration.
A jaw coupling that starts to knock, rattle, or show excess backlash on startup almost always needs a new spider rather than a new hub, but a hub does eventually need replacing if the jaws chip or round off from prolonged running with a degraded spider, or if the bore has worn oversized from a loose set screw. Because this hub is bored to 3/4 in, check it against the shaft with calipers rather than assuming the old part number is still correct, especially on equipment that may have been repaired or re-shafted in the past.
Key Features
- Sintered iron hub built to Lovejoy L-Series dimensions and jaw geometry
- 3/4 in finished bore secured with a set screw
- Fail-safe jaw design keeps the shafts turning if the elastomer spider ever fails
- No metal-to-metal contact between hubs during normal operation
- Splits into two hubs and a spider for simple field service and spare-parts stocking
- Interchangeable with any other genuine L075 hub and spider of the same size class
Applications
- Motor-to-pump and motor-to-gearbox shaft connections on marine and industrial equipment
- Generator, compressor, and blower drive couplings
- General industrial and marine power transmission wherever a Lovejoy L075 coupling is specified
- Higher-torque and higher-duty-cycle drives where the added mass of an iron hub over an aluminum hub is not a concern
Specifications
- Brand: Lovejoy
- Series / Size: L075
- Part Type: Jaw Coupling Hub
- Hub Material: Sintered iron
- Bore Diameter: 3/4 in
- Maximum Bore for This Size: 7/8 in
- Hub Outside Diameter: 1.75 in
- Hub Overall Length: 2.13 in
- Mounting: Set screw
- Nominal Torque Rating (standard NBR spider): 90 in-lb
- Maximum Speed: Up to 1,750 RPM with the standard NBR spider (to 3,600 RPM with an optional urethane or Hytrel spider)
- Quantity Per Coupling: 1 hub (mating hub and spider sold separately)
- Condition: New
Frequently Asked Questions
Q: Do I need two of these hubs to build a complete coupling?
Yes. A complete L075 coupling needs one hub on the driving shaft, one hub on the driven shaft, and one elastomer spider between them. This listing is for a single hub, and the two shafts often need different bore sizes.
Q: Can I mix an L075 hub with an AL075 hub in the same coupling?
The two share the same size class and jaw geometry, but pairing iron and aluminum hubs is not the standard configuration. Keep the pair matched in material unless it has already been confirmed suitable for the application.
Q: What happens if the bore is larger than my shaft?
An oversized bore will not grip the shaft correctly even with the set screw tightened. Do not attempt to bush down a bore that is too large; order the correct bore size instead.
Q: Is a keyway included on this bore size?
No, this bore is supplied without a keyway and relies on the set screw alone. A keyway can be added by a machine shop if the application calls for it.
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 coupling hub.
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