No speed adjustment on Honda HRH 536 mower?

[sandspider]

Hi folks

 

As above. I have an ancient Honda self propelled mower. It works well, but the adjustment slider for ground speed doesn't change anything, one speed only. Engine speed / choke control works, as do the bars for engaging blades and drive. I've had a look at the wire coming off the ground speed control lever, but it gets mixed up with the wire to the lever than engages the drive, so I can't see what (if anything) is wrong. There's a kind of yoke thing that the speed control lever moves, and this just slides along the drive engagement wire - I wonder if this yoke shouldn't slide? (I don't have access to the mower at the moment, so can't take pics and have to rely on my dubious memory!)

 

It's not the end of the world to use it as it is, but it there's a simple fix to give me back ground speed control that would be useful?

 

Thanks.

[Grassyass]

I would think you have the hydro model , I.e the 4 wheel model , could be the cable but from experience once the drive gets worn it will only drive with the lever at full speed and only crawl if drive at all in slow position, 

[sandspider]

Thanks. Mine has 4 wheels, but it drives at the same speed wherever the lever is... Will try and take a pic later.

[sandspider]

Pic attached. So, the bit with the split pin moves back and forth along the U shaped orange plastic thing as the speed lever is moved. But when the drive is engaged, the split pin moves freely with the large spring at the left. It seems that adjusting the speed lever might just move the split pin up and down a bit, and this may be all its supposed to do. But this doesn't make the ground speed change...

[Grassyass]

Dose the cable that goes from the red lever move when you move the lever 

[sandspider]

No, the split pin part slides on the orange u shaped plastic. It moves a little bit up and down, maybe adjusts the tension on the cable a bit, but the cable doesn't move.

[sandspider]

But engaging the drive via the main handlebar lever tightens that cable a good amount, and off the mower goes.

[Dan Maynard]

Is a rusty cable possible? Cheap to fix, my chipper drive was getting worse and worse but new tandem cycle brake cables sorted it for about a tenner.

[openspaceman]

1 hour ago, Dan Maynard said:

Is a rusty cable possible? Cheap to fix, my chipper drive was getting worse and worse but new tandem cycle brake cables sorted it for about a tenner.

That's a better idea than buying the proper mower part too. I'll have to look some out as I am building a bittza honda engined mower, with the rusted out deck replaced by one from a mountfield battery electric with a defunct control circuit. Battery being repurposed into a Halford jump start pack, replacing the dead gel cell.

[sandspider]

4 hours ago, Dan Maynard said:

Is a rusty cable possible? Cheap to fix, my chipper drive was getting worse and worse but new tandem cycle brake cables sorted it for about a tenner.

Good thought, thanks. I've managed to find a workshop manual so I'll pull the drive apart and see what's rusty / broken / needs adjusting.