1Zpresso – K-Series (K-PRO / K-PLUS / K-Max) Grinder

K-series manual coffee grinder
K-series manual coffee grinder

User Instructions

K-series manual coffee grinder

Adjusting the grind setting

  1. Turn the adjustment dial ring counter-clockwise to make the grinds finer and vice versa.
    The number (#) on the dial pointer indicates a finer or coarser grind setting.
    The smaller numbers refer to the finer grind setting, vice versa.
  2. There are 9 numbers/90 clicks in a single rotation; every clicks moves the burr by 0.022mm/22 microns.
  3. Ensure the grinder is well-calibrated after reassembling the grinder.
    Read the calibration guide below or the calibration tutorial post.
  4. Refer to the grind setting tutorial post for several brewing methods.

Coffee Grinding

  1. Remove the handle and put coffee beans into the hopper. The maximum capacity of K-Pro grinder is around 30~35g and K-Plus grinder is around 35g~40g.
  2. Grind coffee beans clockwise with the handle attached.
K-series manual coffee grinder

Disassembly

Demonstrating with the K-Plus grinder
Note: Kindly follow the step-by-step with the tutorial.

K-series manual coffee grinder
  • Turn the adjustment dial clockwise to the coarser grind setting as the burr moving down.
K-series manual coffee grinder
  • Loosen the knurled thumb nut counter-clockwise while pushing the burr and take out the upper bearing cap and the upper bearing.
K-series manual coffee grinder
  • Take out the shaft, burr, lower bearing cover and spring.
K-series manual coffee grinder
  • Remove the burr ring unit and the adjustment dial clockwise from the grinder.
  • Clean each of the parts with a brush and an air blower.

Assemble

K-series manual coffee grinder
  • Turn the adjustment dial counter-clockwise to the tightest position. Be sure to do not overtighten and stop when you feel resistance.
  • Turn the adjustment dial clockwise to the coarser grind setting.
K-series manual coffee grinder
  • Turn the burr ring unit counter-clockwise to the tightest position. Be sure to do not overtighten and stop when you feel resistance.
K-series manual coffee grinder
  • Put the components back in the right sequence: lower bearing cap (the raised edge side facing upward), spring, shaft and burr.
K-series manual coffee grinder
  • Put the components back in the right sequence while pressing the burr: upper bearing, upper bearing cap (the concave edge of the cap facing upward and ensure insert the upper bearing cap with correct direction).
K-series manual coffee grinder
  • Turn the knurled thumb nut clockwise while pushing the burr and stop when you feel resistance.
  • Turn the adjustment dial to the zero setting and observe its number (#) whether on the #0.
    Read the calibration guide below if not pointing at the #0.

Warning:
Do not attempt to disassemble or remove the following components:

K-series manual coffee grinder

The central shaft and the burr

K-series manual coffee grinder

The burr ring unit and the outer burr

K-series manual coffee grinder

The adjustment dial ring

K-series manual coffee grinder

The bearings

Calibrating the Adjustment Dial

  • You would need to either loosen or tighten the knurled thumb nut or the adjustment dial to calibrate the grinder. 
  • It is common for the starting point of the adjustment dial to be around two or more clicks away due to the strength you use to tighten the knurled thumb nut.

Instructions

K-series manual coffee grinder
  • Ensure to calibrate the grinder step by step.
  1. Turn adjustment dial ring counter-clockwise to the zero/tightest settings.
  2. Ensure the central shaft is not loose nor installed incorrectly.
  • The grinder is well-calibrated if the dot is at #0 when the adjustment dial ring is at its tightest position.
    Read the following steps for calibration if you don’t get #0 for the zero setting.

K-series manual coffee grinder

If the red dot is pointing at the right side of #0

  • Memorize how many clicks the red dot is away from “0”.
    Turn the adjustment dial ring clockwise to a coarser setting as the gap inside the adjustment dial ring enlarges.
  • Gently press the burr while loosening the knurled thumb nut counter-clockwise by the number of the click divided two.
    Turn/retighten the adjustment dial ring counter-clockwise to its zero settings and see what number (#) the red dot points at.
  • Repeat this step or the next step until the grinder is calibrated.
K-series manual coffee grinder

If the red dot is pointing at the left side of #0

  • Memorize how many clicks the red dot is away from “0”.
    Turn the adjustment dial ring counter-clockwise to a coarser setting as the gap inside the adjustment dial ring enlarges.
  • Gently press the burr while loosening the knurled thumb nut clockwise by the number of the click. 
    Turn/retighten the adjustment dial ring counter-clockwise to its zero settings and see what number (#) the red dot points at.
  • Repeat this step or the step above until the grinder is calibrated.

Precautions

  • Do not clean and wash the grinder with water.
  • Do not wipe your grinder with solvents other than water and alcohol.
  • 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.