Another Blade failure

[Scott Farmborough]

Jensen 528, second time within about nine months...this time its blown the two bearings to bits, the anvill is in bits and the flywheel has the fins bent round...all in about £1200 worth of damage, right before Chistmas:thumbdown:

I couldnt be more of a tart with my machine....i really watch what i put through it, always sharp blades...cleaned before put in and everything torqed up to manufacterers spec.

In all of my 17 years of tree work and having used every make and model of machine it has to happen to mine twice....am i just unlucky?

[Mozza]

Sorry to hear that mate, The jensens ive used over the years have been very hit and miss, some have run really well and others have run really bad and have had constant problems, The last one i used that ran badly was only a year old too, It had problem after problem, Jensen do seem to have alot more breakdowns than the rest in my experience with them.

 

 

 

Dont get me wrong when they run right they are cracking machines!!

[Scott Farmborough]

My mechanic has just told me that the bolt holding on one of the bearings was loose!

He usually needs a long handle to undo them....but it easily came off with a spanner!!!

So thats why it failed!!!!

[skyhuck]

So the blade hit the anvil??

 

OUCH!!!!!!!!!!!

[scotspine1]

Jensen 528, second time within about nine months...this time its blown the two bearings to bits, the anvill is in bits and the flywheel has the fins bent round...all in about £1200 worth of damage, right before Chistmas:thumbdown:

I couldnt be more of a tart with my machine....i really watch what i put through it, always sharp blades...cleaned before put in and everything torqed up to manufacterers spec.

In all of my 17 years of tree work and having used every make and model of machine it has to happen to mine twice....am i just unlucky?

 

What condition where the blades in? sharp?

 

Got a 2003 528 with 900 hours on the clock, never had this problem (so far), sounds like it'd be worth speaking to the guys at Redwood to find out whats going on before someone gets seriously hurt.

 

Only issue I've had with the 528 is the fuel tank which I drained and cleaned last week after getting fed up with constantly blocked fuel filters. The filth that came out it was unbelievable.

 

Unrelated to your problem but do you powerfile the roller teeth to keep an edge on them and tension the springs down a few threads every now and then?

 

Is this the model you have?

Edited November 22, 2009 by scotspine1

[Mike Hill]

Where was the bolt located that came loose?

Front bearing bolts or the rear (infeed) end?

[Scott Farmborough]

What condition where the blades in? sharp?

 

Got a 2003 528 with 900 hours on the clock, never had this problem (so far), sounds like it'd be worth speaking to the guys at Redwood to find out whats going on before someone gets seriously hurt.

 

Only issue I've had with the 528 is the fuel tank which I drained and cleaned last week after getting fed up with constantly blocked fuel filters. The filth that came out it was unbelievable.

 

Unrelated to your problem but do you powerfile the roller teeth to keep an edge on them and tension the springs down a few threads every now and then?

 

Is this the model you have?

I have 1400 hrs on mine and is still in very good condition, blades are always sharp and changed approx every 10-15 hrs.

Only done the springs a couple of times....as for the rollers the top one i have sharpened twice and is ok but the bottom one was blunt, but isnt now! because the machine is in bits so a good opportunity to do it.

How do you reach your bottom roller when in place to sharpen?

Because its a bloody nightmare...and do you use an angle grinder?

[Scott Farmborough]

Where was the bolt located that came loose?

Front bearing bolts or the rear (infeed) end?

It looks like it was the front bearing bolt (engine end)

and yes the anvil was in tiny bits....a bit annoying as it was only a couple of months old!

[Mike Hill]

From memory....One of the Bolts has a washer with a flat face on it,this orintates towards the feed roller housing.I wonder if the bolt is done up withour the washer correctly placed,the washer could be on an angle and loosening of the bolt might be a matter of time?

[scotspine1]

blades are always sharp and changed approx every 10-15 hrs.

 

There's your problem right there, there's no good reason why you should be changing blades every 10-15 hours, ruining the threads mate. Slackening. tightening etc. Why are you changing the blades so frequently?

 

Black and decker powerfile for the lower roller, go in through the hopper and go light on both sides just to get a sharp edge.