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MF 2745 PTO issue. Won't shut off without idling down.

O

Old Baler

New User
Odd PTO system issue I have yet to find any relevant info on.

Everything works fine but at higher RPMs like above 1500 the PTO will not shut off, it will but it takes 5 - 15 seconds and sometimes longer, unless the RPM's are brought down.

I've taken the control valve apart figuring it was jamming up or warped some how but I didn't find anything.

Do I have a flow divider valve stuck some place? I have had all the valves I can find on the plate the PTO contorl valve is attached to out and they all appear to just be pressure relief units.

Anyone know what causes this?
 
If you have an implement on does it still turn the pto with the pto off? I would say your pto brake is shot and probably the bands are are a touch warped. Should check
pressure to the unit with pto on and off, then if that comes back okay might have to remove pto unit! It comes out the right side without spiting the tractor.
 
Yes whatever it's powering will stay turing for a bit even at a heavy load.

With nothing hooked up it will stop if the RPMs are brought down which to me says it's a fluid supply problem and not a clutch or brake issue.
 
Also at time the power shift cuts out and only the PTO functions or just stays on all the time until the it's either idle down to 600 RPM or shut completely off their resets and works fine again and might not do it for days.
 
Without anything hooked up it will shut the PTO off normally if the RPM's are below 2000 or so which to me say it's not a clutch problem but a fluid flow issue.
 
Sorry for breaking this into disjointed bits but the system will not let me post more than a sentence or two at a time nor will it let me edit anything either. :x
 
To me it acts like it has a stuck flow divider valve but so far I have not found anything and what limited information I have found online has not shown me much of value I can work with.

Most parts breakdowns I have found have references to certain pages that do not exist so I have no clue as to what I am looking for when it comes to what ports and pressure I need to be checking.
 
I will have to sleep on this! LOL

One thing make sure when you go to disengage pto idle the motor down first so it is not making the brake work so hard!

And like I mentioned put a gauge on the valve to see if you have pressure when pto is off. Still guessing your problem is dragging of plates and a shot brake, but lets
take it one step at a time and do a pressure test first.

Do you have a shop manual?

Also when you say the power shift cuts out, please describe what is going on and what ranges high or low?
 
On the right side of the trans will be the cover for your main pump and on it is the valve for the diff lock and pto, there is a sending unit on it you take it off and
hook a gauge to where the sending unit was taken off. You will need at least a 500 psi gauge!
 
(quoted from post at 01:34:39 07/27/17) I will have to sleep on this! LOL

One thing make sure when you go to disengage pto idle the motor down first so it is not making the brake work so hard!

And like I mentioned put a gauge on the valve to see if you have pressure when pto is off. Still guessing your problem is dragging of plates and a shot brake, but lets
take it one step at a time and do a pressure test first.

Do you have a shop manual?

Also when you say the power shift cuts out, please describe what is going on and what ranges high or low?
Click to expand...

I don't have a shop manual book. Just the online parts books from one of the dealership websites to work with.

It will get slow to shift between medium and high or medium and low or reverse or won't shift out of medium at all regardless of what range it's in.

Also when it does that the three point will stop working or raise real slow despite the fluid levels being fine.

It doesn't seem to be heat related either. Hot or cold fluid it can act up. If anything hot fluid seems to work best for getting faster PTO shutdown.
 

No differential lock on this tractor but I know were the PTO indicator light switch is so I will put a guage on it when I get a chance this week.
 
Hydraulic filters should be changed every 750 hours according to the book, I recommend at least once a year, i'm sure you don't put 750 hours on in one year. Change them
if you didn't do it yet in a years time, then see how it acts!
 
(quoted from post at 13:31:38 07/27/17) Hydraulic filters should be changed every 750 hours according to the book, I recommend at least once a year, i'm sure you don't put 750 hours on in one year. Change them
if you didn't do it yet in a years time, then see how it acts!
Click to expand...

It has less than 25 hours on new filters and the old one that came out were clean.
 
Alright for a follow up the PTO valve hydraulics are running at 400 480 PSI at 2000 RPM and up.

At lower RPMS (~1500 - 1700) where I am at ~350 PSI and below the PTO shuts right off without issue. Above that the shutdown time gets slower and slower.
 
Did more digging today and cleaned out the pressure relief valve.

It was not moving much due to being packed full of fine fuzzy grit of sorts inside the tiny inner parts of the spool.

Now the pressure is down around 290 - 330 PSI depending on RPM's and when the PTO control valve is switched of the PTO clutch pressure drops right to zero.

However the PTO keeps right on going until the RPM's are brought down into the 1500 - 1700 RPM or lower range then shuts right off.

I also cleaned out the lower flow divider valve and the second divider on the left hand side of the tractor that is part of the filter assy. The spool was jammed solid in that one.
 
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