Honda gv400 main vertical drive that operates all the power pulleys on my ride on mower has a threadsd shaft to attach the round pulley wheels.My bolthas dropped out and lost so iI need a replacement bolt what diameter is it and description or better still part number and how I get replacement part.I looks almost 12 mm but not sure.

You most likely need a puller .Look at the end of the shaft that the pulley slides on to .If its round you need to pull it .If its got a flat on one side of the shaft then their will be a set screw behind the pulley hex key remove that then the pulley will slide off by hand might need a little force but don't bend it

Should be a bolt hold bottom pulley on. Need a puller pulley assembly off.

If it's where i think it is you have to disconnect the axel rod off of one side and put the belt around the shaft from there.

This one's a PITA. That said, I had to remove the PTO clutch and pulley, the seat, the brake and transmission pedals, and finally the sheet metal that constitutes the fenders and foot plates.

Belt is put over the fan above the transmission and onto the pulley there, then run along bottom of main frame towards the front until it reaches the engine drive shaft.

The belt goes onto a pulley on the engine drive shaft (above the PTO clutch and pulley, which have to come off). I couldn't slide the drive pulley down the shaft, so pulled the 4 engine mounting bolts and move the engine around slightly to allow putting the new belt on between the pulley and it's surrounding sheet metal. Once the belt was on, and before any other steps, I realigned the engine mounting holes and replace the bolts.

The belt is then run around the pulleys under the middle section of the tractor. Leave the spring loaded idler pulley for last. you might need to loosen (not remove) the bolt that goes through the idler pulley in order to get the belt on. The biggest fight is pulling the spring loaded pulley over so that you can put the belt onto it.


Once the belt is fully routed over all pulleys. Reinstall everything that you had to remove - and you should be good-to-go.


ONE LAST COMMENT: Many shops sell belts that DON'T have Kevlar. Make sure you but the one WITH Kevlar. The others rarely last one season.

The drive pulleys do have Shear pins where they go on the shafts. These pins do shear off once in a while. With your machine turned off try to turn pulleys by hand . If they turn easily then these could be broken. Just a thought. Try turning your drive wheels by hand with tractor in gear as the drive wheels have safety pins as well. The pins are inside the wheels or pulleys and you have to remove them to insert the pins.

You will need to take off he main pulley. I did this by knocking in a wood wedge between the drive pulley and the deck and clamping on some molegrips so the pulley did not go round when undoing the nut at the bottom other wise the motor turns, Undo the nut anticlockwise as usual. The pulley assembly then drops down so you can remove the drive belt

ya it can be freed up with some W-D40 if you pah the cluch down then try to get the belt off i can get you a new pulley let me know

need to purchase a new belt should be numbers on it too get the right one after getting it it will fit round the pulleys under the mower from the main drive to go round a tenshoner to end up round the blade pulley just need to figure its ruote round the pulleys the tensioner pulley is the last one to fit it on as you need to pull against the tension to get the belt to go round

Its possible that the cable slipped does the pulley turn on top of trans.if so does the shaft turn if so then your gears on wheels need cleaned or replaced.

firstly you are the only person i know of with a mr710 other than myself mine still has serial no on it 00054.To me this says not many made. i could not find a blade for mine so done my own mods with cox swivel blades but do not know of any others in australia. I can not even find any info on net. honda motors with vertical shaft are not common but never give up like all hondas. try the mower shops as an alternative. hope this may help