CH12859 Water Pump – Service Part for John Deere 850 950
CH12859 Water Pump with 2" OD Fan Hub — replacement for John Deere 850, 950, 1050, 900HC and Yanmar 3T80-J, 3T90-J, 3T90T compact tractor engines, supplied new with gasket. Early bearing wear and shaft play signal the start of pump decline — scheduling replacement before seal leakage or impeller loss avoids head gasket and liner damage downstream. Plan seasonal stocking across planting and harvest cycles to keep fleet cooling systems ahead of predictable wear intervals. Maintenance interval guidance and cross-reference verification included with every shipment.