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Isuzu 1-81200563-0 is the 24 V engine alternator with a twin groove V belt pulley, cooling fan and regulator lead. It is used on Hitachi EX400-3 excavators and KH series crawler cranes with the Isuzu 6RB1 engine. 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 | Alternator |
| Replaces | Isuzu 1-81200563-0 |
| Type | Alternator with twin groove V belt pulley and fan |
| Voltage | 24 V |
| Engine | Isuzu 6RB1 |
| Fits | Hitachi EX400-3; Hitachi KH300; Hitachi KH500-3 |
| Condition | New, aftermarket |
| Stat. HS-Code | 851150 |
Machines
Check the part number on your old unit before ordering.
| Isuzu Part No.(SPM Part No.) | Fits |
|---|---|
| 1-81200563-0(SPM-HEP-3120) | Hitachi EX400-3, Hitachi KH300, Hitachi KH500-3 |
Battery not charging
A charge warning light or flat batteries every morning point to the alternator once the belt and wiring check out.
Noise
A worn bearing whines or grinds.
Low voltage at idle
Weak output shows as dim lights and slow electrics at idle.
Fit with a new belt
Change the belt and check the tensioner when fitting the alternator.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (8 aftermarket sellers) | USD 249.00 to 650.87 | 7 Oct 2026 |
| Fab Heavy Parts | USD 298.21 | 7 Oct 2026 |
| Spare Part Mart | USD 199.20 | Today |
Our price of USD 199.20 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.
No. It is an aftermarket part made to fit in place of Isuzu 1-81200563-0. It is not made by or affiliated with Isuzu; the Isuzu part number is used only to show what it replaces.
It fits Hitachi EX400-3; Hitachi KH300; Hitachi KH500-3. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It has the same mounting and electrical connector as the original. Check the plug and terminals match your old part, and test it before putting the machine back to work.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
Prices depend on your ZIP or postcode.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
