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Caterpillar 10R-9788 is the 24 volt heavy duty alternator with a threaded drive shaft for the pulley, a cooling fan, two mounting ears and copper output studs on the rear housing. It is used on Caterpillar 950G to 980G loaders and D6R. 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 Caterpillar 185-5294.
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 | Caterpillar 10R-9788 |
| Machine | Caterpillar 938G, 950G, 962G, 966G, 972G, 980G loaders; D6R, D8N; 322C, 324D, 329 |
| Voltage | 24 V |
| Cross references | Caterpillar 185-5294 |
| Fits | Caterpillar 938G, 950G, 962G, 966G, 972G and 980G wheel loaders, D6R and D8N track-type tractors and 322C, 324D and 329 excavators |
| Condition | New, aftermarket |
| Stat. HS-Code | 851150 |
| Country of Manufacture | China |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 10R-9788(SPM-HEP-4752) | Caterpillar 938G, 950G, 962G, 966G, 972G and 980G wheel loaders, D6R and D8N track-type tractors and 322C, 324D and 329 excavators |
| 185-5294(SPM-HEP-4752) | Caterpillar 938G, 950G, 962G, 966G, 972G and 980G wheel loaders, D6R and D8N track-type tractors and 322C, 324D and 329 excavators |
| 10R9788(SPM-HEP-4752) | Caterpillar 938G, 950G, 962G, 966G, 972G and 980G wheel loaders, D6R and D8N track-type tractors and 322C, 324D and 329 excavators |
| 1855294(SPM-HEP-4752) | Caterpillar 938G, 950G, 962G, 966G, 972G and 980G wheel loaders, D6R and D8N track-type tractors and 322C, 324D and 329 excavators |
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, aftermarket seller | USD 247.23 | 31 Oct 2026 |
| FridayParts | USD 266.92 | 31 Oct 2026 |
| Pieces Discount 24 | USD 277.01 | 31 Oct 2026 |
| SINOCMP | USD 379.00 | 31 Oct 2026 |
| Spare Part Mart | USD 204.21 | Today |
Our price of USD 204.21 is 17% to 46% 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 938G, and 10 more listed under compatible equipment. Check the old alternator is marked 10R-9788 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar 938G, typically 5,000 to 10,000 hours, depending on how often the machine is started and how well the batteries are kept.
A charge warning, low battery voltage with the engine running, flickering lights or bearing noise.
Battery voltage under load, the earth strap and the main cable. A weak supply makes a good alternator look faulty and will burn out the new one.
Disconnect the battery earth before removing the old unit. The main cable is live at full battery current.
No. It is an aftermarket alternator made to replace the Caterpillar 10R-9788. 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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