2228360 Imer Mixer Shear 8 X 16 Pin
Features
- Sold Individually
- Fits minuteman workman 250, 350 and HM2 models
- Drum dump assembly bearing
The Imer Mixer Shear 8 X 16 Pin is a genuine OEM shear pin (also listed as IMER part no. 2228360) designed to protect the drivetrain on IMER concrete and mortar mixers by acting as a sacrificial safety link between the drum and the drive system. This 8 x 16 mm mixer shear pin is specifically used on popular IMER models such as the Minuteman, Workman 250, Workman 350, and HM2 mixers, where it helps prevent costly gearbox or motor damage if the drum jams or is overloaded.
What Is the Imer Mixer Shear 8 X 16 Pin (2228360)?
The Imer Mixer Shear 8 X 16 Pin is a small but critical safety component in IMER drum mixers. It’s often referenced in parts lists as:
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“2228360 Imer Mixer Shear 8 X 16 Pin”.
The “8 x 16” designation refers to its metric dimensions (8 mm diameter x 16 mm length), and it is used as a shear pin/shaft shear pin in the drum dump or gearbox assembly on specific IMER mixers.
Which IMER Mixers Use the 8 X 16 Shear Pin?
Product and parts descriptions consistently state that the Imer Mixer Shear 8 X 16 Pin (2228360) fits several key IMER mixer models.
According to Contractors Direct and Blades Direct:
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Fits Minuteman mixers.
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Fits Workman 250 mixers.
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Fits Workman 350 mixers.
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Fits HM2 models.
Parts diagrams reinforce this:
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A Minuteman parts drawing lists “2228360 – PIN 8 X 16” in the gearbox assembly, alongside bearings and gears.
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The Workman 250 II manual refers to the “shaft shear pin (8 X 16)” that must be properly seated in the drum cone when assembling the drum to the shaft.
IME R Parts also lists similar 8 X 16 pins under part numbers like 20741MER Imer USA 8 X 16 PIN, used in Workman 250 II electric mixer subassemblies, indicating that this size is standard across several IMER drum mixer platforms.
What Does the Shear Pin Do in an Imer Mixer?
In IMER drum mixers, the 8 x 16 shear pin is designed to act as a mechanical fuse.
From the Workman 250 II manual:
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When installing the drum, you must “place the drum on the shaft cone, making sure that shaft shear pin is inside its seat in the drum cone.”
Functional role:
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The pin sits in a keyed position between the shaft and drum cone or between gearbox components.
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Under normal mixing loads, it transmits torque from the driver (motor/gearbox) to the drum.
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If the drum is overloaded, jammed by hardened concrete, or subjected to sudden shock, the shear pin is designed to break (“shear”) before expensive components like gears or motor shafts are damaged.
By sacrificing itself under extreme load, the Imer Mixer Shear 8 X 16 Pin protects the more costly engine, gearbox, and drum from catastrophic failure.
Dimensions and Technical Characteristics
While most retailer listings don’t go into detailed metallurgy, they confirm the key specs of the Imer Mixer Shear 8 X 16 Pin.
Core specs:
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Part number: 2228360.
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Description: Mixer shear pin / concrete mixer shear 8 x 16.
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Size: 8 x 16 mm (8 mm diameter, 16 mm length).
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Type: Shear pin / safety pin for drum and gearbox drive.
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Sold: Individually (each).
IME R Parts describes its 8 X 16 PIN repair parts as “quality replacement part[s] to keep your machinery running smoothly,” emphasizing their role in maintaining efficient operation.
OEM vs Generic Shear Pins
While the pin may look like a simple piece of metal, the Imer Mixer Shear 8 X 16 Pin is engineered with specific material and shear characteristics for IMER mixers.
Using the OEM part:
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Ensures the correct shear strength – strong enough for normal mixing, weak enough to break under overload.
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Maintains IMER’s original safety design, as described in the manuals and parts diagrams.
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Provides precise fit in the drum cone and shaft seat, preventing slop or misalignment.
Generic 8 x 16 pins made from unknown steel or hardness may:
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Shear too easily, causing nuisance failures under normal loads.
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Or not shear at all under overload, passing stress into gears, bearings, or motor shafts with expensive consequences.
That’s why IMER parts suppliers highlight these as OEM repair parts and recommend using the official 2228360 pin (or equivalent OEM 8 X 16 PIN such as 20741MER on certain models) rather than hardware‑store dowels.
When Should You Replace the Imer Mixer Shear Pin?
You should replace the Imer Mixer Shear 8 X 16 Pin in several situations:
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After a jam or overload
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If the drum no longer turns under motor power
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Engine or motor runs, but drum does not spin or spins intermittently.
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This is a classic sign that the shear pin has broken and is no longer transmitting torque.
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During gearbox or drum cone service
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Anytime you disassemble these areas, you should inspect the pin and replace if worn, bent, or cracked.
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As preventative maintenance
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Many rental yards keep spare 8 x 16 shear pins on hand and will proactively replace them in heavily used mixers to avoid downtime.
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Because the pin is inexpensive compared to mixer downtime, keeping several OEM 2228360 pins in stock is standard practice for contractors and rental shops.
Installation Considerations
While each mixer model has its own detailed instructions, the general principles for installing an Imer Mixer Shear 8 X 16 Pin include:
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Aligning the shaft and drum cone so that the pin seat is visible.
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Inserting the new 8 X 16 shear pin fully into its seat, ensuring it sits flush and correctly supports the torque path.
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Confirming that the drum is properly seated on the shaft cone with the shear pin engaged, as described in the Workman 250 II manual.
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Reassembling all fasteners and checking drum rotation manually before running under power.
Always consult the specific parts/operations manual for your model (Minuteman, Workman 250, Workman 350, etc.) for exact steps and torque values.