Jensen A528 main bearings

[Ds Tree services]

Hi there men i am going to change my main flywheel bearings on my chipper on Monday any hints/tips??

 

Also i understand that the front bearing(engine side looking from the side down on the the chipper) is a standard bearing but the back one is a hardened/different one ?? it looks slightly smaller and wider but only when you look close. 

 

Will i get the bearings from a standard bearing supplier using the numbers ??

 

Any help would be welcome??

 

Cheers !!

Regards Dan

[Ds Tree services]

I did the bearings yesterday and didn't bump in to no problems ended up replacing a few other bits and bobs but I'm struggling to get the anvil to knife gap right i can get one right but then the other one is closer, the flywheel is the same at 4 points, is states in the manual to shim at the back of the knifes ?? don't know if anyone can cast any light on that also does anyone know what the gap should be as I'm just trying to put it back how it was before ??

Cheers men !

[PeteB]

Quite often, GreenMech do ours to a loose 2mm blade/anvil gap. How much difference have you got? If it isn't a great deal, split the difference! Is the rotor running true or is it warped or badly machined originally?

[Mike Hill]

Your front (Engine end) bearings have bolt holes,you cant adjust them sideways.

 

Tighten up for front ones first.

 

Your rear bearings have slots that the bolts go through,this allows for your sideways adjustment.With a new Anvil and a New set of blades,gap your knives at .5mm on the inside(side closest to the shaft) and 1.5mm  on the outside(side furtherest away from the rotor shaft) .This allows for warp in the Disc when it hits a big bit of wood.Its going to be a arrrse pain getting it right and you might want to clamp the bearing down as you torque the bolts.Remember to loc tight the threads and clean the bolts first.

 

Long story short the blades do not meet the anvil square,they run a little bit on an angle to it.

 

A reminder to use New unsharpened blades and a new Anvil or the Knives will hit the anvil if you have gapped it with  worn or sharpened blades.

[Mike Hill]

From memory the 528 has two lugs,one of each side of the rear bearings that have bolts through them that you can wind in to push the bearing block one way of the other.They have allen key heads,

[Ds Tree services]

Thanks for getting back to me men, i have got the gap to .5mm and 1.5mm with my knifes i haven't set it with new ones as i have 4 sets that are about half worn but put a new anvil in, i will need to re set when i get new knifes but that wont be any time soon. It took me longer to get the gaps right than the whole job lol.. 

I took it out yesterday and it chips well and the in feed seems better, i did all the springs and rollers and replaced every other bearing i think 6 in total.(she's like a new one).

 

The rotor is running true and the balance is fine, i will do a few jobs with it and then re check and torque up all the bolts again. 

 

Ill soon be offering a chipper repair service lol....