It's A Grind - Grinder Tech

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Grinder Tech
Updated 1-13-08

General
Worn Mills
One of the most difficult things for the neophyte service tech to identify is worn burrs.
The rule of thumb is that if you can identify wear, they should be changed.

Mahlkonig

VTA (R2D2) Change mills, grind chamber service.

In spite of the fact that grinding coffee is a fairly destructive process, these are very precise mechanisms.
The two mills must be on absolute equal planes. Any deviation from the perfect planes results in variation in particle size and a less perfect brew.

    After removing the old mills, clean everything.
    Use a worn emory cloth, razor blade, wire brush, and solvents to remove any trace of coffee build up, varnish or oils on these *critical* surfaces.
        The two joining surfaces, where the grind head mounts to the base.
        The surface the burrs mount to.

The cleaned grind head

and Base.

Adjustment Mechanism
Often the neophyte service tech lubricates the mechanism, and like on espresso grinders, this is a mistake. Use a wire brush and or solvents to remove any trace of grease or oil.

Replace shaker rod

Troubleshooting

"Grinder overheats and pops the breaker" (All)

If the grinder is new, it is most often operator error. Most of the time, it is dark roasted coffees. It takes more dark roasted beans to make a pound then it does a lighter roast. The bags fill higher and the grinder usually begins overload just as the bag fills.
I suggest disconnecting the earphones as the motor makes a distinctive sound as the motor comes under more and more load.

"Bag shaker noisy" (VTA, W401)

    There are several possibilities....

    Shaker Plate upper mounting screws loose.

    Shaker plate misaligned. When replacing the shaker plate, always tighten the rod screw before tightening the two upper mounting screws.

    Shaker rod worn or broken. Length for the VTA's is 106.3mm. Worn shaker rods can be noisy. Check the tip where it engages the offset cam for concave or mushroom shape.

    Different machines take different shaker rods. Location of the pin is different. Standard VTA's the pin is 82mm from the shaker plate mount, with the Costco pin 71mm .

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