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Komatsu 7861-93-4131 is the position sensor (potentiometer) on the throttle motor: a geared pickup on a two hole flange with a grey lead and a three pin plug, which tells the controller where the fuel lever sits. It is used on Komatsu PC200-7 excavators. This aftermarket version has the same mounting and electrical connector as the original, so it plugs in and bolts on where the old one came off.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Throttle Motor Position Sensor |
| Replaces | Komatsu 7861-93-4131 |
| Connector | 3 pin |
| Mounting | Two hole flange |
| Fits | Komatsu PC120-6, PC200-7 and PC300-7 excavators and the D155A dozer |
| Condition | New, aftermarket |
| Stat. HS-Code | 903289 |
| Country of Manufacture | China |
Komatsu machines
Check the part number on your old unit before ordering.
| Komatsu Part No.(SPM Part No.) | Fits |
|---|---|
| 7861-93-4131(SPM-HEP-4630) | Komatsu PC120-6, PC200-7 and PC300-7 excavators and the D155A dozer |
Wrong or missing reading
A failed sensor gives a dead or false gauge reading or a warning light.
Fault codes
Check the wiring and plug first; if the sensor itself reads out of range, replace it.
Corrosion
Connectors on machines take water and dirt. A corroded sensor is cheaper to replace than to chase.
Fleet spares
Common sensors are worth keeping in stock for each machine type.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| FridayParts | USD 41.99 | 31 Oct 2026 |
| SINOCMP | USD 50.00 | 31 Oct 2026 |
| YEM Parts | USD 54.51 | 3 Nov 2026 |
| Buy Machinery Parts | USD 64.93 | 3 Nov 2026 |
| eBay (2 aftermarket sellers) | USD 118.45 to 142.79 | 31 Oct 2026 |
| Spare Part Mart | USD 40.00 | Today |
Our price of USD 40.00 is 5% to 72% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Yes, it was made for the Komatsu PC120-6, and 2 more listed under compatible equipment. Check the old sensor is marked 7861-93-4131 or one of the cross references, because makers change parts between serial ranges.
On the Komatsu PC120-6, there is no fixed interval. It is changed when it fails, and many fail from water in the plug or chafed wiring rather than wear.
A fault code for this circuit, readings that jump or stay fixed, or a part that does not respond with power at the plug.
Yes. Many machines have 12 V and 24 V versions of the same sensor. Check the old part or the machine plate before fitting.
A little dielectric grease keeps water out of the plug on machines that work outside. Make sure the terminals are clean and tight first.
No. It is an aftermarket sensor made to replace the Komatsu 7861-93-4131. It is not made by the original manufacturer; the number only shows what it replaces.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
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