The Old Lawnmower Club
Collection, Preservation and Display of Old Lawn Mowers
X

Replace front roller on JP super 12’

Enter a word or two to search the forum section and click the Search Forum button.
Jimbo1987 Wed, 13/07/2022

Hi,

I have asked previously but didn’t get a response, I am trying to replace the rollers on my Jp super 12’, however I have been so far unable to take off the front axle, I have removed the wheel I have had a good read of the manual and it indicates that the split pints should also first be removed which I believe is on the image below, I have tried everything to undo the bolts but can’t do assume that must be the case, however I am not 100% sure what the split pin is, the manual doesn’t appear to show it as a part for reference, can anyone point it out in the image below please.

2

Forums

Rob T Sun, 17/07/2022

Hi Jimbo,  I did reply to your last post asking to confirm that you were talking about the front roller but you didn't come back!  I can know see it is.

First remove the Screwed Handwheel (1 in my picture below) & it's washer.  Then remove the two Front axle Pivot Screws (2).  They are probably very tight!  Put plenty of penetrating oil on first.  They have small flats on them, ensure a well fitting spanner else they will round off.  Once they are both removed you can take out the whole front axle assembly with rollers in place.  To take apart the front axle you need to remove the Taper pins (3).  Plenty of oil soaked in first.  If you are not aware taper pins can only go in and out one way as one end is bigger than the other (hence tapered!).  Ensure you strike the small end with a hammer to remove.  You may need a suitable punch as well depending on if the release before the head is flush with the axle body?  You should then be able to remove the rollers.

Not sure what manual you refer to?  There are no split pins in your photo only a taper pin.

1 - Screwed Hand Wheel. 2 - Front Axle Pivot Screw2 - Front Axle Pivot Screw. 3 - Taper Pin

 

Hope this helps.

 

Cheers Rob3 - Taper Pin

Rob T Tue, 19/07/2022

Split pin arrowedJimbo,  I don't believe the split pin is related.  There are two (ref 1-8A on page 12) that hold the handles onto the long cross tube.  They don't actually show them in the drawing.  I have pointed one out in the picture below so you know what they are.  I don't know how much experience you have a dismantling old components but I would say the key is not to rush.  Use a wire brush to clean off as much rust first.  Then soak in plenty of penetrating oil.  Best leave overnight or even longer before taking the hammer to it.  Support the back of the axle on something solid like a vice or a suitable bit of metal tube etc. Then accurately strike the small end of the taper pin.  If you miss and hit the casting it may well crack and then you are stuffed!  Good luck!  Rob.  

Jimbo1987 Tue, 26/07/2022

Thanks Rob, I have so far been unsuccessful getting this pin out, I have no experience with old machinery and am not really mechanically minded, I will keep perceiving and hopefully get there in the end, do you have any issues with using heat to try and loosen the taper pin?

 

appreciate all your help.

Rob T Wed, 27/07/2022

Jimbo,  Heat can work well but you have to not go too mad with it.  Being cast it can be more prone to cracking if you get one area a lot hotter than the rest.  I have not had to use it on taper pins before.  Maybe someone else has experience?  If I resorted to it I would heat up the whole end of the casting around the pin (not just the pin) until it is hot but not even to dull red.  Then let it cool slowly naturally.  May have to try several times.  If that doesn't work you may have to drill them out but that is quite a tricky job to do accurately. Good luck!  Rob