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Honda HRX 476

Started by Mick, May 10, 2017, 06:00:57 PM

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Had a customer bring in his Honda HRX476 yesterday. He said it lost its drive and the chain had come off. 

Today I decided to take a look, thinking it would have the usual problem of the outer pin shearing on the gearbox output shaft, (had loads of these) and the chain falling off because the gearbox shifting and putting the sprocket out of line. 

But this wasn't the case this time.  The end of the output shaft including the top sprocket had worn through and dropped off, and disappeared completely.  Doh.. 8)

Marks Mowers

Local honda dealer has told a couple of my customers they need new gearboxes when all that's gone is that pin.
But never seen one where through before


Hi Mark.  I've not seen one as bad as this before, I've seen them with a bit of ware on the shaft when the bearing had seized, but obviously this one had gone beyond that point.   ;)


The chain has started to drop off my mower that had a new gearbox 5 months or so ago, i put the chain back on once and within 5 mins dropped off again, Where abouts is this pin that shears?


graeme, if you look just inside the deck where gearbox sits, on the output shaft of the gearbox you should see two very small roll pins, one each side of the gearbox to hold it in the correct position between the the two bearings. It's usually the chain side one that fails and lets the gearbox move outwards putting chain sprockets out of line.

If it is that also check the two bearings while you're in there.  ;)


I have had one of these pins shear in the past and I know a few people who have been advised by Honda dealers that they require a new gearbox......I wonder why  :hmm: