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Komatsu 7861-93-1840 is the low pressure sensor switch with a threaded steel body and a sealed plug. It is used on Komatsu PC200-8 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 | Low Pressure Sensor |
| Replaces | Komatsu 7861-93-1840 |
| Fits | Komatsu PC200-8 and PC300-8 excavators and D37PX-22 and D39EX-22 dozers |
| 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 |
|---|---|
| 7861-93-1840(SPM-HEP-4495) | Komatsu PC200-8 and PC300-8 excavators and D37PX-22 and D39EX-22 dozers |
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 |
|---|---|---|
| eBay (3 aftermarket sellers) | USD 26.98 to 28.00 | 30 Oct 2026 |
| WDPart | USD 52.80 | 3 Nov 2026 |
| FridayParts | USD 66.05 | 30 Oct 2026 |
| SINOCMP | USD 69.00 | 30 Oct 2026 |
| Spare Part Mart | USD 21.58 | Today |
Our price of USD 21.58 is 20% to 69% 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 PC200-8, and 3 more listed under compatible equipment. Check the old sensor is marked 7861-93-1840 or one of the cross references, because makers change parts between serial ranges.
On the Komatsu PC200-8, 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.
Read the fault codes, then check the plug and wiring for corrosion or a broken wire. A wiring fault reads the same as a failed sensor.
Yes. Many machines have 12 V and 24 V versions of the same sensor. Check the old part or the machine plate before fitting.
No. It is an aftermarket sensor made to replace the Komatsu 7861-93-1840. 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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