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Nitrile (NBR) O-Ring Assortment Kit, Metric, ...: 
Universal Filter Strap Wrench for Oil, Fuel a...: Caterpillar 478-8207 is the screw-in cartridge solenoid valve: a cylindrical coil with a side connector, a hex nut on the coil end and a threaded valve body with cross drilled ports and O-rings. It is used on Caterpillar D6 and D8R tractors. This aftermarket valve has the same ports, mounting and coil connector as the original, so it fits 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 | Solenoid Valve |
| Replaces | Caterpillar 478-8207 |
| Type | Screw-in cartridge |
| Connector | On the side of the coil |
| Fits | Caterpillar C7.1, C9 and C15 engines in D5R2, D6, D8R, D10T2 and D11 track-type tractors |
| Condition | New, aftermarket |
| Stat. HS-Code | 848180 |
| Country of Manufacture | China |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 478-8207(SPM-HEP-4644) | Caterpillar C7.1, C9 and C15 engines in D5R2, D6, D8R, D10T2 and D11 track-type tractors |
| 4788207(SPM-HEP-4644) | Caterpillar C7.1, C9 and C15 engines in D5R2, D6, D8R, D10T2 and D11 track-type tractors |
Function will not work
If a hydraulic function is dead but the pump and controls work, the solenoid valve or its coil is the usual suspect.
Drift or creep
A valve that does not seal lets cylinders creep. A new valve restores holding.
Burned coil
A coil that reads open or short on a meter needs replacing; check the connector for water first.
Fleet spares
Keep the common valves for your machines in stock to cut downtime.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (5 aftermarket sellers) | USD 92.57 to 204.74 | 31 Oct 2026 |
| StopSolenoid | USD 148.60 | 31 Oct 2026 |
| Buy Machinery | USD 169.55 | 31 Oct 2026 |
| FridayParts | USD 178.03 | 31 Oct 2026 |
| Spare Part Mart | USD 74.06 | Today |
Our price of USD 74.06 is 20% to 64% 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 Caterpillar C7.1, and 4 more listed under compatible equipment. Check the old solenoid valve is marked 478-8207 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar C7.1, 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.
Usually. Clear them after fitting and run the machine, so old codes are not mistaken for a new fault.
Measure the coil resistance with a multimeter and check for supply voltage at the plug with the circuit on. An open coil reads infinite.
No. It is an aftermarket solenoid valve made to replace the Caterpillar 478-8207. 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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