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Guide

How to measure a part for replacement

Good measurements and photos are the difference between a replacement that fits first time and one that doesn’t. This is what we ask for with every request.

Tools that help

  • Digital calipers for outside and inside diameters, thickness and depth. Inexpensive ones are fine for most parts.
  • A steel rule or tape for anything longer than your calipers.
  • A thread gauge to identify the pitch of threaded knobs, caps and fittings.
  • Your phone camera, with a ruler in each photo for scale.
  • For curved or odd shapes, a profile gauge or a careful tracing on paper.

Before you measure

  1. Clean the part so dirt and paint don’t add to the measurement.
  2. Look for numbers cast, stamped or moulded into it. They often identify the part outright.
  3. Note the tractor model, year and serial number. Many parts changed partway through a production run.

What to measure

  • The fit, not just the outside. Measure what the part mates with: the shaft a knob fits, the hole a cap sits in, the bolt spacing a cover mounts to. A worn or broken part may have lost its true size, but the mating part usually hasn’t.
  • Overall size: length, width, height and the largest diameter.
  • Holes: the diameter of each, and the spacing measured centre to centre.
  • Threads: the outside diameter of the thread and its pitch (threads per inch, or the pitch in millimetres).
  • Wall thickness, and the depth of any recess or socket.
  • Flats, keys and splines on shafts: where they are and how wide.

Measure each dimension two or three times and write down the average, with the units. If something is worn or damaged, say so next to the number.

Photos that help

  • Square-on views of the top, side and underside, with a ruler beside the part at the same distance from the camera.
  • A photo of the part fitted on the tractor, so we can see how it meets the parts around it.
  • If it is broken, photograph every piece laid out together.
  • Good, even light without strong shadows. Daylight near a window works well.

What happens next

Attach your measurements and photos when you request a part. They help us confirm the part, tell you if a correct replacement is already sold somewhere, and decide whether we can reproduce it. We never publish your photos.