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[Dennis C]

Putting the new one on is easy, shaft in freezer gear in oven (when the boss is out), will slip on a treat, just be quick and don't let it stop halfway.

[Tim NZ]

You WILL HAVE killed the temper of the gears by heating them beyond 120c...


Hydraulic press is the only way to remove and refit the gears safely

[Gwilly]

I have removed a number of bearings and gears using this tool.

Very strong and with various adaptors and extensions, also the plate can be bolted together behind the gear and will not damage or distort in the same way a legged puller has been known to do..

Not been defeated yet. When you fit the new gear just heat to very hot and it will probably fall on to the cold shaft..

[Dennis C]

Tempering begins at 204deg, heating to 150 will have no effect, been doing it for over 50 years and never had a bearing or gear wear prematurely.

[Dennis C]

I have just checked the SKF technical data and they recommend 150 deg with a maximum of 250 deg.

[Gwilly]

My apologies to WJS and all, It seems my picture has screwed with the width somehow..

Never failed with this bit of kit.. Heat the new gear to very hot but not dull red if you get my meaning.

It will just fall on the cold shaft and tighten as it cools..

[Boxerman]

I have one of those, bought it originally to get a bearing off a back axle.
Good bit of kit, I paid around half of that price from Ebay

Frank

[Dennis C]

Gwilly, these things happen on this message board, we have little control. Just be careful how hot you get them (see my erlier post), as Tim say's, too hot will affect the hardness of the metal.

[WJS]

OK they are off and the 14t trials gears are fitted. BUT this meant considerable heat although not enough to get the gears glowing red just very hot- around the point at which the oil on them spontaneously smokes (for the chefs out there). Then I used a 4" puller and this was right on the edge of its capabilities! Required an 18" tommy bar to get the leverage and I consider this downright dangerous. Eventually with the addition of more steady heat during the extraction the gears squeaked and came loose.

Refitting was straightforward although the layshaft is considerably easier as the mainshaft does not have much of a shoulder to support it and the hot gear had to be tapped down. Again needed some more heat as it quickly shrinks onto the splines.

I was rather concerned about the heat/tempering issue but heyho needs must and time will tell. Although I did let the parts cool naturally to avoid adding brittleness by quenching etc. Having said all that surely gears are case hardened not tempered and at temperatures of 600 deg C or more??

[GoonerAl]

hey m8 are these gears your fitting the trials ratio gear set that lowers 1st,2nd,and 3rd gears but not top gear???