Gearbox Bearings

[hendred]

I decided to check the bearings in my gearbox and am glad I did! Both bearings in the end cover were failing.
The mainshaft ballrace fitted was a 6301 2RS.  Why a shielded bearing was used here I don't know, the shields showed signs of overheating (melting) and the bearing was very rough; on examination the tracks were very crazed. Replaced with a new SKF 6301.

The layshaft bearing in the kickstart is the needle roller type; the cage rings were cracked on both sides of the cage on what appears to be a manufacturing weld joint.  Replaced with a new one.  There is a tip in the bearings list on this site about the need to replace this bearing - well worth heeding!

I used Simply Bearings, both bearings in stock and overnight delivery.

Regards,

Jon

 

[Smokey_Paul]

Ah ha so this is where I saw this before reading my emails Jon ??

[hendred]

The rubber shielded bearing failed when the gease disappeaed.  The replacement open bearing was heavily rusted after three months even though the bike had not been out in the rain.  Think it must be condensation inside the gearbox.  The latest replacement is metal shielded bearing with the shield on the gear side removed.  I have packed the space between the bearing and cover with grease to try and protect the bearing.  The selector rods were quite rustyas well.  All cleaned up and the gearbox is working well.  Will check it in future to see how it is lasting.      

[Smokey_Paul]

I think this will be on my to do list for the winter as I have yet to remove my gear cover as it is the one part that has not given me problems as of yet

[Smokey_Paul]

Hi Hendred,

I was reading the kick start list :-
Kick start.
RHP 6004 2RS Kickstart housing bearing 1off 40od x 20id x 14w
Caro bronze se46 Layshaft /kickstart shaft bush 1off (early bikes or safer option)
INA15x19x13                   As above                    1off (later bikes, better performance but requires changing periodically)
 
6004 2RS size does not match bearing number?

What is the part number of the roller bearing to replace?

Cheers

[Smokey_Paul]

I ordered these as a guess lets see what happens

Products Each Total
1 x KT151913 Caged Needle Roller Bearing 15x19x13mm
Option's £2.92 £2.92
1 x SKF 63012RSH Rubber Sealed Deep Groove Ball Bearing 12x37x12mm
Option's £4.10 £4.10
1 x SKF 60042RSH Rubber Sealed Deep Groove Ball Bearing 20x42x12mm
Option's £4.13 £4.13

The 6004 I dont understand as the number matches the bearing list but the size does not??

[hendred21]

Hello Paul,

The KT151913 caged needle roller is the size I used.  

As I said in my earlier posting on this topic, the 6301 2RS had failed through lack of lubrication.  When I pulled the seals out, which had overheated, the bearing was dry and the tracks crazed.  The replacement open 6301 rusted very quickly and I am now running with a 6301 2Z with the seal on the gear side removed to allow oil lubrication from the gearbox.  The space between the triangular (sort of) cover and the bearing is packed with grease.  I didn't remove the bearing from the kickstart housing as that seemed ok so cannot comment on the part number or size.

Hope this helps.  

[Smokey_Paul]

Well gearbox inspected my 6301 bearing was perfect and as new but the needle roller was as stated cracked and very worn. I was very lucky in removing the outer case as everything stayed in place incuding the bushes on the end of the shafts and the bearing held in place in the kickstart gear.

Everything now cleaned and new bearings fitted and new oil to go in tomorrow.