KOMATSU 426-20-31121 / 426-20-31120 OE Part Manufacturers in India

The driveshaft between the engine and transmission on a Komatsu WA600-6R or WD600-6 has one of the hardest jobs on the machine — carrying full engine torque before the transmission has a chance to modulate it. The PTC 2019 Driveshaft (OEM: KOMATSU 426-20-31121 / 426-20-31120) is a direct drop-in replacement for this section, built to match all OEM dimensions so it installs without any modification to the machine.

This shaft connects the engine's output directly to the transmission input, making it the first link in the driveline to absorb torque spikes from hard acceleration or sudden gear changes. Because of that positioning, it is engineered with forged yokes and precision-balanced tubing to handle repeated shock loading without developing the kind of imbalance that shows up as cab vibration further down the line. Wear here often shows up first as a knock at startup or a shudder under sudden throttle, rather than the more gradual vibration you'd get from a driveshaft further along the driveline. We manufacture the PTC 2019 from high-grade steel tubing, dynamically balanced as a complete assembly rather than in separate pieces. Every unit is checked against OEM drawings before dispatch and an inspection report is available on request.