Bucket tooth pin diameter
How to measure a worn bore — and why a worn tooth always measures small.
Complete index
All undercarriage & wear parts guides
Everything we have written about measuring, identifying and confirming excavator and loader parts. Written for people who have to get the part right the first time.
Measurement and identification
Part number and casting mark
The three numbers on a part, and how to photograph the one that matters.
Loader cutting edge
Measure the bolt pattern, not the width — the reason edges get returned.
Wear and diagnosis
Track roller wear limits
When a roller is due, and why a leaking roller is more urgent than a worn one.
Track tension check
How to measure sag, and why over-tension wears rollers faster than use.
Track keeps loosening
Why it is usually the adjuster seal, not a stretched chain.
Components
Excavator sprocket
Tooth count, pitch, and why the sprocket goes before the chain.
Excavator idler wheel
Tread wear versus bearing failure — two different problems.
By machine model
Parts diagram
Every undercarriage component, named and explained.
Maintenance checklist
Daily, weekly and monthly checks in the order that catches failures first.
Pins and bushings
Why pin sizes are nominal, and what wears first.
Bucket teeth sizes
Measuring without a catalogue.
Sprocket wear signs
The progression, and why it takes the chain with it.
Komatsu PC200
Why the model name is not enough, and what identifies the variant.
CAT 320
Serial prefix and casting mark identification.
Removing a seized tooth pin
Why pins seize, and the least damaging way to get one out.
HS code classification
How undercarriage parts get classified for customs — and what your supplier must provide.
Track pad bolts
Torque, tightening pattern, and why they keep loosening.
What the parts market looks like
Listing volume by component — which categories are actually crowded.
Undercarriage replacement cost
What drives the number, with sourced figures for components, duty and freight.
Front end loader bucket teeth
Measuring loader teeth — and why 'front end loader' vs 'wheel loader' matters for parts searches.
Wheel loader cutting edge types
Steel, rubber and bolt-on compared — and the measurement that causes returns.
Identification cheat sheet
The one-page version: what to measure on every component, and the four things to send.
Before you order
Send machine make, model, serial number and a photo of the casting mark. We confirm the part number and fitment basis before any price discussion.