NORTH YARD GEARBOXES (click on thumbnail for diagrams):
North Yard makes three styles of gearbox:
431 series 0.4 module, idler
432 series 0.3 module, non idler
433 series 0.3 module, idler
The series number forms the first three digits of the part number. The next two digits in the part number are the input shaft diameter in mm; the final two digits are size of axle the gearbox fits.
GEARBOXES, NORTH YARD
Acetal case, steel worm, bronze bearings, acetal gears.
Minimum driver dia. 14.3mm, or 12.4mm if bottom cover trimmed.