Cat Reman crankshafts such as part # 20R4195 receive reciprocating motion from the pistons via connecting rods and convert it to rotary motion. Cat crankshafts are heat treated during initial production, using a patented hardening process for outstanding wear characteristics and high strength. We test every crankshaft for genuine Caterpillar reliability.Attributes:• Cat Reman UTN crankshafts are new crankshafts which provide new performance and reliability at fraction-of-new costs with return of a qualifying core.• Cat Reman UTN crankshafts come with a same-as-new, 12-month Caterpillar Limited Warranty 1 against Caterpillar defects in material and/or workmanship.• Cat Reman offers drop-in solution.1 Warranty can vary by model and application; limitations apply. For complete details about the applicable Caterpillar Limited Warranty, contact an authorized Cat dealer.