First, we'll replace the idler low speed gear.
This is a simple two step process: 1) Using a bearing splitter, press the idler gear away from the idler low speed gear and rear tapered roller bearing as pictured below. Tip: Take note of the orentiation of the shift hub by marking its top side, and support the shift hub from its bottom edge.
2) Replace the stock 19-tooth idler low speed gear with our 22-tooth Marlin Crawler idler low speed gear, and press the rear tapered roller bearing back onto the idler gear as pictured.
Tip: Ensure you replace the shift hub in the same orientation as it was removed (the tapered edge should be facing the idler gear). Be sure to only apply pressure on the rear bearing's inner race, taking care not to contact the cage. If you simply press right across the bearing, you will damage the cage and destroy bearing. In the image below you'll notice an old bearing race between the ram of our press and the rear tapered roller bearing. This old race serves as a piece that only contacts the rear tapered bearing's inner race and the ram of our press. This way the pressure is transferred directly to the inner race of the rear tapered bearing. Try to find a similar component that only contacts the bearing's inner race.
