Cycling UK Forum

Hi, I decided to give my commuter pedals some TLC after a number of years without touching them. There was a bit of play in them so I decided to take them off my bike and put on my spare set. I ordered the Shimano PD-40 tool and thought I'd give them a service. I clamped the drive side pedal into a vice and merrily wrenched the tool anti-clockwise. It was quite tight but it eventually came free, so much so that I could turn it by hand. But alas the spindle didn't start to move. It was then I realised my schoolboy error. I popped the non drive side pedal in the vice and turned it anti clockwise and it came out as expected. The drive side now turns both ways by hand. Looking into the other pedal it does seem the thread is cut into a soft metal. I fear I have stripped the threads in there. Any thoughts? Have I just got to bin them? Can they be saved?


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Good point. Having checked Evans they appear to be Shimano M424. https://www.evanscycles.com/shimano-m42 ... gKhpvD_BwE


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IIRC the bearings are retained by a plastic sleeve. If you have wrung this off in a fit of misplaced, er, "enthusiasm" you may be able to recover the situation by buying and fitting a new sleeve.

This part

https://www.sjscycles.co.uk/pedals-cleats/shimano-pdm545-lock-bolt-right-43z-1310/

is the correct one for a RH pedal, being LH threaded, that also fits your pedals
http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/PD/EV-PD-M424-1953A_v1_m56577569830608610.pdf

and 43Z-1410 fits the LH pedal, being RH threaded. Both (as well as the later versions of the tool) are marked with the correct direction to tighten.

Check carefully that there are not parts of the old sleeve trapped in the pedal. You may need to clean the screw thread out with something pointy before fitting a new sleeve. If the old sleeve sheared off, it may be melted out of the pedal with a little heat, but this also leaves a real mess to clean up. Obviously make sure that the plastic cage is not damaged when using this approach, either by removing it first or by wrapping it in wet rag or something.

hth

cheers

PS from your description it sounds as if the sleeve has sheared off (probably at the start of the screw thread) and the remaining part of the sleeve will be nigh-on impossible to remove without use of heat.

I suggest that you cut off the loose (rotating) part of the sleeve so that you can have a look at what is left in the pedal.

cheers

Thanks Brucey, I'll have a look when the sun comes up.


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NB the bearing cartridge (actually a cup and cone bearing set) is a push-fit into the pedal body. Normally the retaining sleeve jacks the bearing cartridge out of the pedal body. If the sleeve cannot be used for that (eg if the thread is stripped or the sleeve is broken) you will need to find some other way of extracting the bearing cartridge before the bearings can be adjusted.

It may be that whilst the pedal body is hot (about 150C) if the pedal spindle is clamped in a bench vice (using something to pack out so that the pedal spanner flats are gripped) then some kind of lever can be used to push the pedal body upwards and release the spindle/bearing cartridge that way. The thermal expansion coefficients work in your favour, since the pedal body is made of aluminium (which has a high CTE) and the cartridge is steel (which has a lower CTE).

BTW I am not sure if the plastic pedal cage can be removed without extracting the spindle first. It may not be possible to slip the spindle through the hole (even once the remains of the sleeve are cut away) and in addition the outboard cage support is normally removed after the spindle is extracted (the securing screw cannot be accessed beforehand). In theory the cage can be sacrificed and replaced but I am not sure that anyone stocks the correct spare part.

cheers

The plastic collar stripping was quite a common occurance when Shimano first brought these pedals out and at the time it was a case of new pedals as the spare parts weren't fully available and given the cost of a new set of pedals or a new collar I'd go for a new set of pedals. If you look around you can get M520s for £20 and would imagine M424s can be had for similar money.

new PD-M424 are usually more than PD-M520. A new sleeve is £2.99.

IMHO the repair is for sure economically viable but I am wondering whether it is practical or not, in that if (as I suspect) the sleeve is sheared off inside the pedal, it is going to be very difficult to repair the pedal without other collateral damage.

cheers

Brucey wrote:PS from your description it sounds as if the sleeve has sheared off (probably at the start of the screw thread) and the remaining part of the sleeve will be nigh-on impossible to remove without use of heat.

cheers

Ive made the same mistake as the OP and the pedal is as you describe(an M520 but same design),I've just left mine and use it with a little play in the bearings until it gives up the ghost,I'll then buy a new pair of pedals and cleats for about £20

with PD-M520 that is a practical solution, but with PD-M424 it is less so; IIRC the inboard part of the cage pivots on the sleeve, and once the sleeve is loose, so will the cage be. I suspect there will be much rubbing and so forth.

cheers

Brucey wrote:with PD-M520 that is a practical solution, but with PD-M424 it is less so; IIRC the inboard part of the cage pivots on the sleeve, and once the sleeve is loose, so will the cage be. I suspect there will be much rubbing and so forth.

cheers

Im not sure it does pivot on the sleeve.

reohn2 wrote:Im not sure it does pivot on the sleeve.

take a look at a pedal or perhaps the EV techdoc

http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/PD/EV-PD-M424-1953A_v1_m56577569830608610.pdf

The cage pivots on the sleeve via bush part #4.

cheers

Brucey wrote:

reohn2 wrote:Im not sure it does pivot on the sleeve.

take a look at a pedal or perhaps the EV techdoc

http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/PD/EV-PD-M424-1953A_v1_m56577569830608610.pdf

The cage pivots on the sleeve via bush part #4.

cheers

Just been out and taken a look at the pair of M424's I have.The cage pivots on part No 4 not No2 ,remaining castelated section of part No2 is held in position(when stripped from the threaded part) by the shoulder on the pedal axle,so the pedal can still be used without problem IMO.
Also if heat needs applying to the M424 pedal body to melt out the threaded sec there's definitely danger of melting the cage and part No4 in the process

there are wee tangs on #4 but they are just for location, to stop the thing from turning separately from the pedal body.

Any vertical load on the cage is is borne by the sleeve, which if it is damaged or broken. will likely bear on the spindle and scuff/scrawp away like nobody's business.

cheers