500 seems a tad steep Tim, think the last one I changed was little over £300 and the parts needed were that much if not a little more.

+ a clutch cable because I always advise changing it when doing a gearbox rebuild or fitting a new box.  The cable is one of the major causes of gearbox failure on these.   

Handy that you had some of the parts though, a good excuse to use them up.  

Thanks, Mick. Yes I think they are around 5 centuries new. I've paid nothing like that as I had the splines and the bearings " in stock". I had the Hayter 48 60v which was great but too small. Sold that as preordered a Hayter 56 Pro-e but it has been delayed so the HRH will see me through this summer.

Mountfield SP164 39cm 123cc Self-Propelled Rotary Lawn Mower Full Details and Purchase at SCREWFIX



Powered by a 123cc STIGA OHV engine with a tough, corrosion-free polypropylene cutter deck. Lightweight, easy to use and economical to run. Includes 3 x height adjusters with 5 pre-set cutting positions and a 40Ltr grass collector. Suitable for lawns up to 400m².

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• Without Mulching Facility

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Powered by a Mountfield ST120 OHV 123cc engine and features a tough, corrosion-free polypropylene cutter deck. Lightweight, easy to use and economical to run. Includes 4 height adjusters with 5 pre-set cutting positions ranging from 25-70mm. Can also be used without the collector to leave the cuttings. Suitable for lawns up to 400m².

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• Hardened Steel Blade
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• Without Mulching Facility
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We found nowadays once you have to start fitting parts to one of these gearboxes it was nearly as cheap to fit a whole gearbox.

Think we use a SEA80 gear oil.  But I believe a 80w90 is recommended.

Tim, thanks for the update.  Glad it fixed the issue. 

Mick just to close this you were right. The guy ordered the part and fitted it. He's immensely grateful and am I!

Hi Mick and all,
Bought at lovely HRH roller for personal use. Got it cheap as it wasn't driving. Only 2015 and used by homeowner. Stripped the rollers off and it was clear issue was the roller bearings had seized. So decided to strip down gearbox as oil seal was leaking and to change dog clutch. I'm replacing oil seals and the spline bearings too. Can anyone please confirm what weight of transmission oil Honda recommends (80w-90?)

Absolute pain by the way. The amount of stone chips and sand blasting has eroded the casing of the transmission to the point that the housing around the seal is literally disintegrating. So had to buy new transmission casing (both sides😢).

Hi Paul. 

Is the Height of cut actually working on the mower? 

They used to make a long grass roller kit but not sure you can get them now.

Hi
Is it possible to obtain a larger diameter front roller to increase the height of cut.
I find the mower cuts to short even on number 5
It's a Qualcast 14 inch
Or any other mods?
Thanks