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Hitachi 9318851 is the main machine controller in a grey cast aluminium finned case with four slotted mounting feet and a sealed multi pin connector block along one edge. It is used on Hitachi ZX330-3G 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.
The same part is also sold as Hitachi X9318851.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Main Controller (Pump Control Unit) |
| Replaces | Hitachi 9318851 |
| Machine | Hitachi ZX330-3G |
| Label | X9318851, ZX330-3G, Type A |
| Connector | Sealed multi pin block, one edge |
| Cross references | Hitachi X9318851 |
| Fits | Hitachi ZX330-3G excavators (the unit is labelled ZX330-3G, Type A) |
| Condition | New, aftermarket |
| Stat. HS-Code | 853710 |
| Country of Manufacture | China |
Hitachi machines
Check the part number on your old unit before ordering.
| Hitachi Part No.(SPM Part No.) | Fits |
|---|---|
| 9318851(SPM-HEP-5058) | Hitachi ZX330-3G excavators (the unit is labelled ZX330-3G, Type A) |
| X9318851(SPM-HEP-5058) | Hitachi ZX330-3G excavators (the unit is labelled ZX330-3G, Type A) |
Fault codes and dead functions
When functions stop working together or the display shows controller faults, a failed controller is a common cause once wiring and connectors check out.
Water and impact damage
Controllers take knocks, vibration and water. A cracked or corroded unit fails soon after.
Quicker than repair
A replacement unit is quicker than repairing boards and components one at a time.
Fleet spares
A spare controller turns a breakdown into a swap.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| SINOCMP | USD 529.00 | 2 Nov 2026 |
| FridayParts | USD 699.98 | 2 Nov 2026 |
| eBay (2 aftermarket sellers) | USD 868.42 to 1,080.39 | 2 Nov 2026 |
| Spare Part Mart | USD 423.20 | Today |
Our price of USD 423.20 is 20% to 61% 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 is a direct replacement for the Hitachi 9318851 with the same fitting.
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.
A little dielectric grease keeps water out of the plug on machines that work outside. Make sure the terminals are clean and tight first.
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 controller.
No. It is an aftermarket controller made to replace the Hitachi 9318851. 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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