That knocking sound from the engine isn't going away on its own, and if you've been hearing it for a while, you know what's coming next. When main bearings start wearing out, it's time to act fast before you turn a manageable repair into an engine rebuild . These main bearings keep your crankshaft properly positioned and supported, handling all the power your engine produces while keeping things running smooth and quiet. What You're Getting Complete pair of main bearings - no need to hunt for individual pieces Precision-manufactured to handle the loads and vibrations of farm work Direct replacement for your original bearings - same fit, same performance Quality construction that matches or exceeds original equipment standards Built for Real Farm Work These bearings fit a huge range of Case IH workhorses from the smaller 33 series utility tractors up through the heavy-duty 95 series row-crop machines, plus the popular 3000/3200 and 4000/4200 utility series. Whether you're running a 595 on hay ground, pulling a disc with an 855, or doing loader work with a 4230, your engine depends on these bearings to keep the crankshaft where it belongs under all operating conditions. Made to Last Farm engines work hard - long hours under load, temperature swings, and constant vibration that would destroy lesser parts. These bearings are built with the proper materials and tolerances to handle the punishment, keeping your crankshaft properly supported whether you're idling at the gate or pulling full power through tough ground. Good to Know This is definitely an engine-out job that requires proper tools and experience - not something for the field toolbox. If you're hearing bearing knock, check your oil pressure and don't run the engine any harder than necessary until it's repaired. Note that this set won't fit the 51 series tractors, and if you need connecting rod bearings, that's part number 52410 .