Sprocket tooth count changes the track's speed and torque relationship: fewer teeth give a larger effective drive radius change per tooth and affect engagement, while the machine specification sets the correct count. Match the count to the pitch and chain, and keep the OEM count unless the machine allows otherwise.
Related reading: for wear detection, see our sprocket tooth wear guide, and for segment replacement, see our sprocket segment replacement guide.
Sprocket Tooth Count Guidance from AFT Parts
- Source: AFT Parts — sprockets and undercarriage components.
- Scope: Sprocket tooth count and chain pitch matching
- Fits: CAT, Komatsu, Kubota, Bobcat, Hitachi, Takeuchi, and more.
- Application coverage: Ontario excavation, rental fleets, municipal work
- Verified: part number and machine serial before dispatch.
What Tooth Count Controls: Engagement, Speed, and Torque
Tooth count controls how the sprocket engages the chain and how the drive converts rotation into track movement. The count is matched to the chain pitch and the machine's drive design.
Changing the count changes engagement and wear behaviour, even if the sprocket still bolts to the drive. The count is part of the specification, not a style choice.
Speed, Torque, and Track Dynamics: Why the Count Matters
With the same chain pitch, a different tooth count changes the drive's effective radius and the track's speed and torque relationship. The machine's gearing and final drive are designed around a specific count.
For most excavators and dozers, the OEM count is the count the drive was engineered for. Changing it alters the machine's working characteristics and can overload the chain or final drive.
The engagement relationship is the part that surprises operators: the chain wraps a larger or smaller arc of the sprocket as the count changes, and the wrap affects both grip and wear. The drive is designed around a specific count, so even a one-tooth change alters the working characteristics the machine was set up with.
Matching Tooth Count to Pitch and Chain: The Pair That Must Agree
The sprocket teeth must mesh with the chain pitch exactly. A tooth count and pitch mismatch causes slipping, hook wear, and premature chain failure.
Confirm the pitch and the tooth count together when ordering. The two specifications must match the chain that is on the machine.
Reading Machine Specs to Find the Correct Tooth Count
The machine's specification or the sprocket part number states the tooth count. Read it from the parts list or count the teeth on the old sprocket before removal.
Count and photograph the old sprocket, because the tooth count is part of the part number cross-reference. A mismatched count is a common ordering error.
The cross-check is two steps: count the old teeth and read the part number, then confirm both against the parts list for the serial number. When the old sprocket has been modified or replaced before, the parts list is the authority, not the part in the machine.
How to Confirm Tooth Count for Your Machine
Compact machines commonly use counts around 15–23 teeth depending on the chain pitch and drive design. The count varies by machine class and manufacturer.
The table below is a general reference; the part number settles the count.
Note: tooth counts vary by manufacturer, model, chain pitch, and final drive design — these ranges are not a selection reference.
When to Keep the OEM Tooth Count and Why Changes Need Approval
Keep the OEM tooth count unless the machine specification lists an approved alternative. The drive, chain, and final drive are designed around it.
For an Ontario rental fleet, keeping OEM counts across machines simplifies spares and avoids configuration mistakes. When a change is proposed, require the manufacturer's approval in writing.
The rule also protects the warranty and the reorder record: a sprocket that matches the OEM count and the part number is a sprocket that can be ordered again without a second investigation.
How to Confirm Tooth Count
- Check the OEM parts book for the sprocket part number.
- Read the tooth count from the old part number before removal.
- Measure chain pitch at the same time.
- Confirm the pair against the machine serial number.
Conclusion
Sprocket tooth count is a matched specification: count plus pitch must suit the chain, and the drive is engineered around the OEM count. Read the part number, keep the OEM count, and require written approval before any change.
Key Takeaways for Canadian Operators
- Match tooth count to chain pitch exactly.
- Read the tooth count from the part number or count the old sprocket.
- Keep the OEM count unless the machine spec allows otherwise.
- Check the drive and final drive before any count change.
Questions to Ask Before You Order
- What is the tooth count and pitch for my machine?
- Does the part number confirm the count and chain match?
- Is an alternative tooth count approved for my model?
Browse the Sprocket collection and the 6733211 Bobcat sprocket for your machine.
Frequently Asked Questions
Does sprocket tooth count affect speed?
With the same chain pitch, tooth count changes the drive's effective radius and the track's speed and torque relationship. The machine is engineered around the OEM count.
Can I change my sprocket tooth count?
Only if the machine specification lists an approved alternative. Changing the count can overload the chain or final drive.
How do I find my sprocket's tooth count?
Read the part number from the parts list or count the teeth on the old sprocket before removal. Confirm pitch at the same time.
Does tooth count affect travel speed?
With the same chain pitch, a different count changes the drive relationship, which is why the drive is engineered around the OEM count.
Can I count teeth with the track installed?
You can count exposed teeth with the track released, but the reliable count comes from the part number or the OEM parts book.