Checking the Timing
This should only be required after disassembly.
Inch the machine forward until the feed pawl has reached its furthermost forward point. View the timing marks through the cut-outs in the rear plate and ensure all three gears are timed correctly as shown below.
To alter the timing, remove the retaining bolt from the bevel idler gear, rotate the gears so that the timing marks line up and replace the bolt in the bevel idler gear. Do not force the bevel idler gear into mating gears as coarse operation will result.