PTO slipping under load, knocking noise

Ihjohnson

New User
I have a 1970's 656 utility tractor with loader. The T/A is stuck in high which is not uncommon from what I hear. I just recently purchased this tractor from a gentlemen who is known for keeping excellent care of his machinery. However the hydraulic oil is low, must be a leak......
Questions....
1) When I check the "oil" by my feet/below the seat is that for everything, minus the engine. Meaning is that telling the oil level for hydraulics, rear end, transmission?
2) Is that where I put the oil in?
3) What oil do I use?
4) The current level of the oil, according to that dip stick is "low". Would that be causing the PTO to "slip" under load? I am pulling a 6' rhino finish mower through 8" grass.
5) Also, just today I noticed a knocking noise under my left foot when the PTO was running under load. Oil level related?
Thanks a ton! If I need to give better more detailed info please let me know.
JJ
 
If the PTO is slipping don't use it till you figure out the problem. Those plates in the PTO clutch will not tolerate slippage. If it is like the bigger tractors there is a plug for a gage, to be screwed in that will give you pressure for the PTO then adjust to the correct pressure.
Hytran or equivalent for oil to add. Sounds like the filter is due for changing also. Would do that before adding oil so if the oil in there is bad could change it.
 
The dipstick is where you add transmission oil----right down
there in all the dirt.
One of IHs classic blunders.
Jim
 
Do you know where this plug to screw in a guage is located? I do not.

What should the pressure read?

I really appreciate your help. Thanks!
JJ
 
If this has the IPTO (independent PTO) down below the lever where you turn it on there is a hole in the bracket that holds the lever pivot. That is the plug. You will need the adapter to fit the threads from JIC to pipe for the gage. I use a short piece of hose so I can read the gage as I turn it on and off. The adapter can be had from your local dealer for a dear price. I have not looked for one elsewhere. Then by turning the valve stem in or out it will adjust the pressure to set that. If it still slips it is probably in need of a new clutch. There is a hole you can put a nail or wire in to turn it.
 
Since I have you let me ask a few more questions.
I am beginning to wonder if it is a clutch issue. How big of a deal is that? My conern is I keep hearing an intermitent knocking or clanking sound under my feet when the PTO is engaged and under load.
I did fill the oil up to the corret level, but the symptoms continue.

Thanks again!
 
Don't know if this could be what you're hearing, but I remember hearing something similar on my older tractors when mowing. It would happen because I didn't have an overrunning clutch on my PTO shaft or mower and, there would be times when the tractor would have a mechanical hesitation (such as dropping into a shallow hole) and the momentum of the mower would overrun the tractor, clunking the gears.

I don't know how much of a "problem" this is, but in an ideal world, your gear teeth should never "clank" together.
 
PTO slipping probably means that the clutches in the PTO unit are toast. Even if you do find that the pressures aren't set right it is probably too late.

As far as the clanking/clunking, no idea. Only way to figure that one out is to start tearing things down, unless you can find some external source for the clank/clunk that is fooling you into thinking that it is inside the tractor.
 

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