CUMMINS 4B SERIES ENGINES:
• Cummins 4B/4BT/4BTA 4B / 4BT / 4BTA 3.9L Diesel (1984-1998)
CASE IH EQUIPMENT:
• Case IH 480E/480F/580E/580K Cummins 4B / 4BT 3.9L (1980s-2000s)
• Case IH 580L/590/1840/1845C Cummins 4B / 4BT 3.9L (1980s-2000s)
• Case IH 40XT/60XT/70XT/75XT Cummins 4B / 4BT 3.9L (1980s-2000s)
• Case IH 85XT/90XT/95XT Cummins 4B / 4BT 3.9L (1980s-2000s)
ALLIS CHALMERS EQUIPMENT:
• Allis Chalmers AC 170/AC 175 Cummins 4B / 4BT 3.9L (1960s-1980s)
IMPORTANT:
Oil pump for Cummins 4B/4BT/4BTA 3.9L — the 4-cylinder version of the B-series family. Cross-refs: 3906413, 3280510, 3901384, 3937027. Spur gear type, gear-driven. Used in Case IH backhoe loaders (480E-580L), skid steers (1840/1845C), and various industrial/marine applications.
Do NOT confuse with 6-cylinder 6BT 5.9L pump (3926203) — the 4B and 6B pumps are different despite being the same engine family. Match cylinder count. Failure symptoms: low idle pressure, bearing knock, pressure drop under load. On Case equipment, low oil pressure during digging/lifting is common with worn pumps.
⚠️ Fits 4B/4BT/4BTA 3.9L (4-cyl). NOT for 6BT 5.9L (6-cyl).
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