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Komatsu 8233-06-3350 is the plug in diode block: a grey multi pin connector body with a black rubber cap that pushes into the harness socket. It is used on Komatsu PC300-8, PC350-8 and PC88MR-8 excavators. This aftermarket version is made to the same mounting and connections 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 | Diode |
| Replaces | Komatsu 8233-06-3350 |
| Type | Plug in diode block |
| Machine | Komatsu PC300-8, PC350-8, PC88MR-8 |
| Fits | Komatsu PC300-8, PC350-8 and PC88MR-8 excavators |
| Condition | New, aftermarket |
| Stat. HS-Code | 854110 |
| Country of Manufacture | China |
Komatsu machines
Check the part number on your old unit before ordering.
| Komatsu Part No.(SPM Part No.) | Fits |
|---|---|
| 8233-06-3350(SPM-HEP-5180) | Komatsu PC300-8, PC350-8 and PC88MR-8 excavators |
Relay or solenoid faults
The diode block in the harness stops the voltage spike from a relay or solenoid coil reaching the controller. A failed diode gives blown fuses, relays that chatter or controller faults.
Functions that will not switch off
A diode that has shorted can feed current back into another circuit, so a function stays on or comes on with the wrong switch.
Corroded or cracked housing
Water in a cracked diode plug corrodes the pins. Replace the plug rather than cleaning it.
Fitting tips
Note which socket the old diode came out of, check the pin layout matches and push it home until the lock clicks.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay, aftermarket seller | USD 21.00 | 3 Nov 2026 |
| IronDT | USD 31.00 | 3 Nov 2026 |
| SINOCMP | USD 35.00 | 3 Nov 2026 |
| Propel Parts | USD 38.16 | 3 Nov 2026 |
| Heavy Duty Pros | USD 43.52 | 3 Nov 2026 |
| Spare Part Mart | USD 16.31 | Today |
Our price of USD 16.31 is 22% to 63% 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 PC300-8, and 2 more listed under compatible equipment. Check the old diode is marked 8233-06-3350 or one of the cross references, because makers change parts between serial ranges.
On the Komatsu PC300-8, it depends on hours and working conditions. Follow the machine service schedule, and change it when it shows wear rather than waiting for it to fail.
Leaks, noise, loss of performance, or visible wear compared with a new part. If in doubt, measure it against the sizes in the specifications.
Keep it until the new one is fitted and running. It is the quickest way to compare sizes, connectors and mounting if anything looks different.
Yes. Every order is covered by our 30 day money back guarantee. Keep it unused and in its packaging.
No. It is an aftermarket diode made to replace the Komatsu 8233-06-3350. 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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