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John Deere CH12859 Water Pump Assembly
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| Fan Diameter | 2 in (50.8 mm) |
|---|---|
| Mounting Bolt Holes | 6 holes |
| Body Material | Cast iron |
| Impeller Material | Steel |
| Gasket Included | Pump-to-backplate gasket |
| Pulley Included | No (sold separately as CH10491) |
| Weight | 5 lb (2.27 kg) |
| Overall Length | 5.8 in (14.7 cm) |
| Overall Width | 5 in (12.7 cm) |
| Overall Height | 4.4 in (11.2 cm) |
| Package Dimensions | 14.7 × 12.7 × 11.2 cm |
Manufacturer No.
- CH12859
- A-CH12859
- S-CH12859
OEM Part No.
- CH12859
- A-CH12859
- S-CH12859
- CH10678
Engine Part No.
- Yanmar 3T80-J
- Yanmar 3T90-J
- Yanmar 3T90T
Interchange No.
- 121250-42011
- 721250-42700
- 721252-42700
- 724550-42700
- PX637
- R12895
- S53173
- CH12589
Fitment Vehicles
- John Deere 850
- John Deere 900HC
- John Deere 950
- John Deere 1050
Technical engineering specifications and operating parameters for the CH12859 water pump assembly.
The unit features a cast iron housing with steel impeller, 2-inch OD fan hub, and six-hole mounting flange. Designed for belt-driven coolant circulation in Yanmar 3T80-J, 3T90-J, and 3T90T diesel engines installed in John Deere 850, 900HC, 950, and 1050 compact utility tractors.
Includes pump-to-backplate gasket; pulley sold separately as CH10491.
Cross-references John Deere CH10678, Yanmar 121250-42011, 721250-42700, and 721252-42700.
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