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Hitachi 3100993 is the helical gear on the main pump drive shaft that drives the pilot pump gear train, with 34 external teeth and a 19 tooth internal spline. It is used on Hitachi EX200-3 to ZX280 excavators. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
The same part is also sold as Hitachi 3063842.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Hydraulic Pump Mainshaft Gear |
| Replaces | Hitachi 3063842 |
| External teeth | 34 |
| Internal spline teeth | 19 |
| Machine | Hitachi EX200-3 to EX270-5, ZX200 to ZX280LC |
| Cross references | Hitachi 3100993 |
| Fits | Hitachi EX200-3, EX200-5, EX220-3, EX220-5, EX230-5, EX270-5, ZX200, ZX210, ZX230, ZX240, ZX250, ZX270 and ZX280LC excavators |
| Condition | New, aftermarket |
| Stat. HS-Code | 841391 |
| Country of Manufacture | China |
Hitachi machines
Check the part number on your old unit before ordering.
| Hitachi Part No.(SPM Part No.) | Fits |
|---|---|
| 3063842(SPM-HEP-5183) | Hitachi EX200-3, EX200-5, EX220-3, EX220-5, EX230-5, EX270-5, ZX200, ZX210, ZX230, ZX240, ZX250, ZX270 and ZX280LC excavators |
| 3100993(SPM-HEP-5183) | Hitachi EX200-3, EX200-5, EX220-3, EX220-5, EX230-5, EX270-5, ZX200, ZX210, ZX230, ZX240, ZX250, ZX270 and ZX280LC excavators |
Pump rebuilds
A worn cylinder block and valve plate cost the pump flow and pressure. Replacing them during a rebuild restores the pump without buying a complete unit.
Scored faces
Scoring between the cylinder block and valve plate shows as hot oil, slow functions and metal in the filters.
Matched pair
The block and valve plate wear together, so they are supplied as a pair.
Fitting tips
Flush the system, check the pistons, shoes and swash plate, lap nothing, assemble clean with fresh oil and fill the pump case before starting.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| SINOCMP | USD 105.00 | 3 Nov 2026 |
| Amazon (third-party storefront, ASIN B0DT9Y5BHD) | USD 110.00 | 3 Nov 2026 |
| Kudu Parts | USD 165.00 | 3 Nov 2026 |
| FridayParts | USD 178.49 | 3 Nov 2026 |
| eBay, aftermarket seller | USD 264.16 | 3 Nov 2026 |
| Spare Part Mart | USD 84.00 | Today |
Our price of USD 84.00 is 20% to 68% 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 Hitachi EX200-3, and 12 more listed under compatible equipment. Check the old hydraulic pump part is marked 3100993 or one of the cross references, because makers change parts between serial ranges.
On the Hitachi EX200-3, often 5,000 to 10,000 hours with clean fluid, much less with dirt or air in the system. It is usually changed on condition, not by hours.
Leaks from the seal or weep hole, noise or whining, overheating, or falling pressure or flow under load.
Clean them right back to metal and fit the new gasket or O-ring dry, unless the engine manual calls for sealant.
On piston pumps, yes. Fill the case through the drain port with clean hydraulic oil before the first start, or the bearings run dry.
No. It is an aftermarket hydraulic pump part made to replace the Hitachi 3100993. 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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