Imer Gear Pinion for Workman Mixers

Features

• Fits the workman 250, 350 & HM2 models
• Drum dump pignon

The Imer Gear Pinion for Workman Mixers is a genuine OEM drive gear designed to transfer power from the gearbox to the drum drive system on IMER Workman‑series concrete mixers, ensuring smooth, reliable rotation under heavy mixing loads. Sold under the primary part number 3213264, this hardened steel pinion is a critical wear component in the Workman 250, Workman 350, Workman 350 II, Workman 420 II, and other Workman mixers, and should be replaced with an original IMER gear pinion whenever the drive train shows signs of slipping, noise, or tooth damage.

What is the Imer Gear Pinion for Workman Mixers?

Retailers list this part as “Imer Gear Pinion for Workman Mixers” with SKU or part number 3213264. It is a small pinion gear, usually mounted on a shaft inside the Workman mixer arm or gearbox, that meshes with a larger gear wheel to provide the correct reduction and torque for the drum drive.

Key identifiers:

• Product name: Imer Gear Pinion for Workman Mixers.

• OEM part number: 3213264 (IMR‑3213264).

• Type: Drive pinion gear (Z20 in some parts lists), hardened steel, precision machined.

Blades Direct describes it simply: “Imer Gear Pinion for Workman Mixers. SKU: 3213264. Regular price: $51.89.” IMERParts labels the same part as “3213264 Imer USA PINION Each – high‑quality repair part.”

Compatible IMER Workman Models

According to IMERParts, the 3213264 Imer Gear Pinion fits multiple Workman‑series mixers:

• Imer Workman 420 II Concrete Mixer (explicitly listed; other Workman models share the same pinion).

• Imer Workman II 250 Concrete Mixer – parts manual lists 3213264 PINION GEAR Z20 for the gear train.

• Imer Workman II 350 Concrete Mixer – similar gearbox and pinion/gear arrangement.

In the Workman II 250 mixer manual, the pinion appears in the drum drive assembly as:

• “3213264 PINION GEAR Z 20”, engaging with a larger gear wheel Z 79 (part 2202493).

This shows the gear pinion’s role as the smaller driving gear in a reduction pair for the Workman drum drive. IMERParts notes that 3213264 “fits 10 models,” confirming that it is standardized across much of the Workman range.

Role of the Gear Pinion in the Workman Drive System

On Workman mixers, the drum drive system typically works as follows:

• The electric motor or gas engine turns a drive pulley.

• A V‑belt transmits power to the mixer gearbox or intermediate shaft inside the arm.

• The gear pinion (3213264) is mounted on that shaft and meshes with a larger gear wheel attached to the drum shaft.

This pinion/gear pair:

• Reduces the motor speed to an appropriate drum RPM.

• Multiplies torque so the mixer can handle heavy 9–12 cu ft loads of concrete and mortar.

• Provides a reliable mechanical link between the power unit and the mixing drum.

If the Imer Gear Pinion is worn, chipped, or stripped, power transmission will be noisy, inefficient, or fail completely, even if the motor, belts, and drum are in good condition.

OEM Quality and Construction

IMERParts emphasizes that the 3213264 PINION Each is built for durability and long service life:

• “This high‑quality part is designed to provide reliable performance and durability, making it an essential addition to your equipment maintenance toolkit.”

• “With precision engineering and durable materials, this PINION Each is built to last, minimizing the need for frequent replacements and reducing downtime for your equipment.”

Typical characteristics:

• Hardened steel construction for high wear resistance.

• Precisely machined tooth profile to mesh correctly with the matching gear wheel.

• Correct bore size and keyway to fit the specified Workman shaft (e.g., keyed to shaft 3208771 in the Workman II 250).

Using the OEM Imer Gear Pinion for Workman Mixers ensures proper tooth engagement, quiet operation, and alignment with IMER’s original design.

Gear Pinion in the Workman II 250/350 Drive Assembly

In the Workman II 250 multimixer manual, the drum drive section lists:

• 3213264 PINION GEAR Z 20 – the gear pinion (20 teeth).

• 2202493 GEAR WHEEL Z 79 – the larger driven gear (79 teeth).

This pinion–gear set provides a reduction ratio of approximately 79:20 (about 3.95:1), which helps produce the slow, high‑torque rotation required for efficient mixing while the motor runs at a higher speed.

Other associated parts in the drive train:

• 3208771 SHAFT – carries the pinion and bearings.

• 6301 bearings, keyways, shear pin – maintain alignment and protect the system from overload.

In Workman II 350 mixers, the same design approach is used, with the pinion gear as a critical element in the gearbox or gear box parts subassembly.

When to Replace the Imer Gear Pinion

You should consider replacing the Imer Gear Pinion for Workman Mixers (3213264) when any of the following occurs:

• Chipped or broken teeth – visible tooth damage due to foreign objects, overload, or long‑term wear.

• Excessive wear or thinning of teeth – pointed or hooked tooth profiles, causing noisy operation.

• Backlash or slop in the drive – noticeable play when rocking the drum by hand, beyond normal tolerance.

• Grinding or clunking noises from the mixer arm or gearbox area, especially under load.

Because gears work in pairs, it’s often wise to inspect the mating gear wheel (e.g., 2202493 Z79) and related bearings and shafts at the same time. Severely worn pinions may indicate broader drive train wear requiring a more extensive rebuild.

Pricing and Availability

The Imer Gear Pinion for Workman Mixers is relatively inexpensive compared to major components like gearboxes or motors:

• Contractors Direct lists “Imer Gear Pinion for Workman Mixers – 3213264” in the $50–$60 range, with the example snippet noting four interest‑free payments of about $12.97.

• Blades Direct shows regular price $51.89 for SKU 3213264.

• Apex Hardware Supply shows the pinion discounted from $43.18 to $12.95 in some promotions.

• IMERParts offers 3213264 Imer USA PINION Each with a 1‑year warranty and free shipping on qualifying orders over $50.

Because this is a high‑wear but small part, many IMER dealers keep it in stock for fast shipping, minimizing downtime when a Workman mixer drive fails.

Installation Overview

Exact steps vary by Workman model, but typical replacement of the Imer Gear Pinion involves:

1. Secure and power down the mixer

   • Shut off engine or disconnect electric power.

   • Ensure the drum is empty and stabilized.

2. Access the drive assembly

   • Remove guards and covers from the mixer arm or gearbox area.

   • Expose the pinion and larger gear wheel.

3. Remove the old pinion

   • Loosen and remove retaining hardware (keys, circlips, collars) from the pinion shaft.

   • Slide the 3213264 gear pinion off the shaft, inspecting the shaft and key for damage.

4. Inspect related components

   • Check the gear wheel teeth, bearings, and shaft for wear or damage.

   • Replace any heavily worn parts to avoid premature wear on the new pinion.

5. Install the new OEM Imer Gear Pinion

   • Clean the shaft and keyway, lightly oil if required.

   • Align the key and slide the new pinion into position.

   • Reinstall retaining hardware per the IMER manual.

6. Reassemble and test

   • Refit guards and covers.

   • Run the mixer under light load and listen for smooth operation.

Always follow the specific Workman model’s parts and service manual, as torque values and disassembly sequences differ between Workman II 250, 350, and 420 mixers.

Related IMER Pinion Parts

While 3213264 is the dedicated Imer Gear Pinion for Workman Mixers, IMER also offers other pinion gears for specific models:

• 2002MER Imer Pinion – fits Workman 250 II gas mixers and other equipment.

• 21013MER W350 PINION GEAR – pinion gear for Workman 350 (W350) assemblies.

• 21163MER Imer USA Pinion Each – another pinion variant for specific IMER gearboxes.