How do I replace bearings in a jackshaft?

  • Thread starter Thread starter remush
  • Start date Start date
AI Thread Summary
To replace bearings in a jackshaft housing, first identify the bearings, likely deep groove ball bearings with dimensions ID 15mm, OD 28mm, and width 7cm, possibly part number 6902. Check for any retaining clips before disassembly. Use a small press, available at local workshops, to push the shaft out and remove the bearings without damaging them. If using improvised tools, be cautious to avoid damaging the shaft or housing. Heating the aluminum housing can help ease the removal of tight-fitting bearings. For guidance, consider searching for instructional videos online.
remush
Messages
1
Reaction score
0
Hi all,
I need advice in how to replace bearings in a jackshaft housing.

The housing is about 9cm long, and is made out of Aluminium.
It has cups at each end with bearings currently fitted that need replacing.
There is a hardened solid steel shaft running through the inside of the bearings, that protrudes about 4 to 5 cm each side.

the shaft is 15mm thick.
Here's an example of something similar, except my jackshaft is just a cylinder.
example

The bearings are ID 15mm OD 28mm 7cm wide.

The shaft to bearings is a press fit, or what is sometimes called a interference fit.

I have no special tools at home to do the job. The jackshaft is a part of a mid drive electric bicycle kit, mounted on a bicycle I use as a food courier. I've found a few workshops that will take on the job but the wait time is 1 to 2 weeks, time that I wont be earning money.

Advice and suggestions welcomed and appreciated
Thank You
 
Physics news on Phys.org
Welcome to PF.

The bearings are probably deep groove ball bearings.
Can you read the part number and suffix?
ID 15mm, OD 28mm, 7cm wide, is probably a commodity part number 6902.
The suffix will identify the seals, probably 6902-RR or 6902-2R meaning rubber lip seals.
They will be really cheap from any bearing supplier.

To dismantle the unit, first check for and remove spring retaining clips. See if you can find a lawn mower, bike or car mechanic workshop with a small press you can use. You will have to put the assembly in some sort of press, that will push the shaft out with one bearing. Then push that bearing from the shaft, and the other from the housing.

Assembly is the opposite sequence, but you must press only on the bearing rings that are a tight fit, so you do not bruise the bearings.

If you do the job with a hammer and old water pipes, and it goes wrong, you will have to buy more bearings. Take care not to dent the shaft or fracture the aluminium casing. If the bearings are a tight fit in the casing, warm it all up so the aluminium expands and the fit is easier.

Search YouTube for a video.
 
  • Informative
  • Like
Likes Nik_2213, Tom.G, jack action and 1 other person
Three rabbits will be wintering in a 2m x 2m x 2m wooden hut. Outside temperature does not go below -30c (-22f) Planning to put a 50cm by 50cm 1mm thick stainless steel sheet on the floor of the hut (inside off course) My plan is to heat the sheet with a 50w PTC heater element https://fi.rsdelivers.com/product/dbk-enclosures/fg135600/dbk-enclosures-heating-element-75mm-50-w-100-240-v/dc/2995922?backToResults=1 Is this heater (50W) enough to keep the pad warm enough to sustain liquid...
Hey all. I'm looking to buy a zero-turn mower and I need to build/purchase a ramp to get it into my shed for storage. Exact model is this one. I need to figure out how long of a ramp I need to make sure the mower doesn't bottom out when driving up and down the ramp. Mower stats: Wheelbase: approximately 76 inches. Height: 4.5 inches (based off the highest setting on the deck height adjustment) Shed entrance is 12 inches off the ground. The manufacturer says that the mower can handle...
Thread 'How to remove a seized toilet tank bolt?'
greetings I replaced my bedroom toilet due to water leak and unable to replace water tank bolt with new ones. so now i have old toilet in the yard and i took a closer look at the seized bolt, it seems that the bottom part (a butterfly fastener) holds onto the bolt really tight, when i turned the head inside the tank with flathead screwdriver, the fastener moves with the bolt as the whole. is there a way to remove the bolt?

Similar threads

Back
Top