PTO Blew up

[Rocco]

I was working with the 5 ton dump truck today.
I went to dump it started to dump for a second
Then it stopped So I thought that it might be low on hydraulic and it was.
So I added some. then went back to dumping
And it went up a tiny bit and the Boom!
I looked under the truck and the PTO cracked and broke in a couple of spots
And the drive line was so warped real bad.
What happened??
I think the hydraulic cylinder got clogged or something .
The problem I think was between the pump and the cylinder.

 

[ajgerdes]

sorry, had to say it

 

[sermis]

Did tou loose a U joint on the drive line?

 

[Rocco]

No i did not, U joint still there.
Its not military pump and drive line.
But the pto was military.
I will get pictures tomorrow

 

[CCATLETT1984]

Re: RE: PTO Blew up

sorry, had to say it

I second it, we want pics of the carnage.

 

[sermis]

Gear back lash or something in the tranny got between the gears. Had to bind up somewhere.

 

[rosco]

Improper "lash" between the drive gears can be a problem that causes terrific stress on things. Also, leaving it in gear, while driving creates excessie wear/stress. Not sure you had those conditions. The Gear box will be contaminated now too. Its hard to diagionose with out pictures or hints of problems. See if there were any "spun bearings in the PTO case

Lee in Alaska

 

[Rocco]

It was in neutral.

 

[ems4ty]

BTW - did you have the aluminum shear pin installed or something else? If anything downstream of the drive shaft was to bind then the shear pin would break to save the PTO. If you had the correct aluminum shear pin installed then it binded within the PTO/Transfer Case. Just thought that would help.

 

[Stretch44875]

Sounds like the pump dead-headed. Is there a pressure relief on the valve body or pump? On some systems if you partly engage the valve to raise or lower, if will block the pump. On a normal system, it's not a problem, the relief valve opens. If it doesn't open, instant locking of pump, usually breaks the pump casing.

So when you put another PTO on, be sure relief valve is working correctly, just in case.

Dennis

 

[pa.rich]

What a bad break for ya. I would guess the pump seizes or the driveshaft wouldnt have torqued and bent. If it was just the pto, the driveshaft wouldnt bend.My guess is the pump, Especially if it was low on hydraulic oil.

 

[Rocco]

Im going to take the pump apart soon.
It will be back up and running in no time.

 

[pa.rich]

I will be passing thru W.Virginia in Sept . on the14th or close to that date if you need anything brought down. The deuce in the avatar, is that the one you had the dumper on?

 

[Rocco]

No Its on a 5ton.
No I dont need anything. Thanks for the offer.

 

[Rocco]

EMS4TY >The shear pin is made of steel
and was intact.