Lubrication of the enclosed u-joint with an SM420 transmission.The lubricant addition hole is on the upper right side of the SM420 transmission.
transmission lubricant additions - up to the hole, if lubricant oil is not warm
- 1/2" below the hole if the lubricant oil is not warm
To speed things up in filling a empty "cold" SM420 transmission, I take out the gear lever and fill through the top until the lubricant comes out that hole on the upper right side. (put a drip tray under the transmission to catch the "overfill")
