1Zpresso – J-Max Grinder

J-Max grinder
J-Max grinder
J-Max grinder

User Instructions

J-Max grinder

Adjusting the grind setting

  1. Turn the adjustment dial ring counter-clockwise to find the starting point.
  2. There are 4 and a half rotations in total. 90 clicks in a single rotation; each click moves the burr by 0.0088mm/8.8 microns.
  3. Refer to the grind setting tutorial post for different brewing methods.
  4. Put coffee beans in the hopper and turn the handle clockwise to start grinding.
  5. Follow the guide to calibrate the grinder after disassembling and reassembling the grinder.

Disassembly

Warning: Do not loosen the burr ring unit before step 3.

J-Max grinder
  • Turn the adjustment dial ring clockwise by around two rotations, press the burr and remove the knurled thumb nut counter-clockwise.
J-Max grinder
  • Remove the upper bearing cap and upper bearing.
J-Max grinder
  • Remove the burr and central shaft, spring and lower bearing cap.
J-Max grinder
  • Turn the burr ring unit forward (reverse threads). Disassembling the adjustment dial ring is not suggested.
  • Do not clean the grinder with water. Cleaning with a brush and blower is recommended.

Assembly & Calibration

J-Max grinder
  • Turn the burr ring unit backward (reverse threads) to the tightest position.
J-Max grinder
  • Turn the adjustment dial ring clockwise to align the bottom edge of #0 with the top of the scale mark.
J-Max grinder
  • Put the components back in the right sequence: lower bearing cap (the raised edge side facing upward), spring, shaft and burr.
J-Max grinder
  • Put the upper bearing back from the top.
  • Put the upper bearing cap back (the concave edge of the cap facing upward).
J-Max grinder
  • Press the burr while tightening the knurled thumb nut to complete calibration.
    Note: The starting point might be different within ±10 clicks due to the strength you tighten the nut and dial.

Warning:
Do not dis or remove the following components:

J-Max grinder
J-Max grinder
J-Max grinder

The Burr and Central Shaft

Burr Ring Unit

Bearings

Precautions

  • Do not clean and wash the grinder with water.
  • Keep it in a dry environment in order to extend its lifetime.
  • Follow the instructions of re-assembly, ensure to place the components into the correct positions.
  • Keep the grinder away from children for safety concerns.
  • To prevent the knob from being damaged, putting the grinder and the handle in the case as below picture is suggested.
J-Max grinder



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