450 Ipto questions

Redturbo

Member
I'm trying to run a pto 21gpm hydraulic pump. Once there is load placed on the pump, the pto output shaft slows down a lot. So changed the oil in the Ipto as got the tractor for free. Adjusted the bands, still didn't seem to help. Is one of the bands make the pto slip? Any ideas what the issue might be? This tractor is W450. thanks
 
The linkage on well used PTOs on band style IPTO become dysfunctional after years of use.
Two suggestions:
Make very sure there is no lost motion in the hand lever pivot and rod mechanism. Be certain the hand lever moves the PTO lever
from the middle both ways.
Adjust it like this, after there is no play in links.
Move the lever exactly half way between the locked on position and locked off position (little flipper catch on lever.
Take off the little dome metal cover from the adjust screws.
Loosen the jamb nut, and tighten the front (away from you) screw until it is just a bit tighter than the point at which it begins
to feel tighter as it is screwed in (maybe a eighth turn) then back it off until the PTO shaft will turn with least drag (about
3/4 turn out) and tighten the lock nut while holding the adjuster.
Do the same for the closer adjuster.
If the screws go into the jamb nuts and get flush with the top surface of the nut, the bands are probably worn out, and may be
operational for a while, but plan on a rebuild.
Now (tractor off) push the the lever down toward the front. As it goes down, it should get harder to push when it is about 4" (or
so) away from fully OFF. and be noticeably harder to push for the last inch, but not real hard. (this is the brake band tightening
on the drum in the PTO unit.
Then pull it up and do the same feel.
The ON position should feel the same way.
The shaft should turn pretty free when the lever is half way, and not at all when in either ON, or OFF. (tractor shut off)
If it slips now, it needs a rebuild. JimN
 
Thanks for the reply Jim. I adjusted as per your info. Dad tried it out today, pto slips. Its going to need to come apart & rebuilt then. I'm assuming that a rebuild is mostly replacing the bands?
 
When you take it apart, look at the drive splines on the shaft. Problems other than the band slipping can be causing issues. Constant mesh gears are also a possibility Front of trans. Jim
 

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