Designed for Astro Cobalt 25 Reduction Ratio 1.63 to 1 Output Gear 31 tooth Pinion Gear 19 tooth Motor shaft 1/4 inch diameter Prop Shaft 5/16 inch diameter Prop Nut 5/16 x 24 Housing 1.50 inch Hex Bearings Ball Bearings Mounting Screws 6-32 Mounting centers 1 inch Gear Box Weight 2 ounces Gear Box length 1 inch
Please be sure to lubricate the metal gears before running the
gearbox at high power and after every hour of use. Any light grease will
work fine. We use bike grease or white lithium grease. Make sure there is
proper clearance between the gears. To set the clearance place a narrow
strip of computer paper between the pinion and spur gears,press the gears
together, then tighten the mounting screws. Then turn the shafts to eject the
paper strip and go play!