Massey Ferguson 575 Lift Arm Problem

[Accidental_Farmer]

Hi Folks,

So thanks to the blimin' weather this year I had to rope in pretty much everyone I know to finish everything when it wasn't raining and this has led to a Workshop Project I didn't really want over the winter.

We have a MF 575 that we bring out a couple to time a year to assist with loading in the yard. Considering its age it's in perfect working order and not even too rusty as its been kept indoors. Of all our tractors is just about the only one we can leave for months on end and it starts first time everytime.

So the issue is I entrusted it to one of my inexperienced pals to load some round bales a couple of weeks ago. He lifted the concrete block on the rear arms and left the lift valve right at the top on constant pump.....for about 4 hours. Even the smell of burning wasn't enough to stop him. Big Mistake on my part!

It's no longer in perfect working order needless to say! The Hydraulic pump that controls the loader is still working as the spool valves are working and the loader operates, but the rear arms are stuck in the top position, even with the concrete block still attached. They do not drop even after a period of time with the engine stopped.

Prior to this we have never had any issues, the arms were not slow and they didn't stutter and we regualarly change the oil and filters. I used the tractor myself for an hour the day before and it worked fine.

Any classic MF guys give me pointers on where to start troubleshooting this problem? I'm loathed to let the tractor go to be honest as its manouverable, has quite a long reach and as I said it literally gets used for about 15 hours a year....but for those 15 hours it invaluable!

Looking forward to hearing from anyone with pointers.

Cheers

 

[Tomtrac]

Try putting another loader or jack under and loosen a hydraulic fiting to a lift ram if one fitted or the pipe from lift top it may off just over pressured to system and jammed the valve
But be wary of very high preshure
Ie goggled and gloves and as above lift weight up with loader or poss jack has it a change over valve for hydraulics from arms to spool block operation

 

[bravheart]

Take it it will have one of those flip over handles under the seat, is it in the right side for working the arms and are all the linkages under it connected?

 

[SMID]

It sound very like the linkage pump control valve has stuck in the lift position due to the heat , a bit of work to get to @MF-ANDY will be better explaining it than me

 

[multi power]

It sound very like the linkage pump control valve has stuck in the lift position due to the heat , a bit of work to get to @MF-ANDY will be better explaining it than me

Or could the piston in the lift ram possibly got stuck ?

 

[Pennine Ploughing]

could be the roller has poped out on the lift linkage, the spring will pull into lift,l put i this would make it want to lift all the time, and go into constant pumping, and with the roller missing, the linkage would be doing nothing wherever put put the levels,
drain couple of gallon off the back end, easy way is to fit a short hyd pipe to a rear spool into a drum, pull spool lever to fill drum,
take side plate off on right hand side, held on with about 6 bolts, look in and you will see 2 legs sticking up with 2 small holes at the top end, get someone to move the cab leavers while looking on, if no roller, the legs wont move, to fit new roller you have to easy the legs apart to get it in, if the legs are to wide that the roller is moving side to side, they need a nip together before fitting

 

[joe soapy]

could be the roller has poped out on the lift linkage, the spring will pull into lift,l put i this would make it want to lift all the time, and go into constant pumping, and with the roller missing, the linkage would be doing nothing wherever put put the levels,
drain couple of gallon off the back end, easy way is to fit a short hyd pipe to a rear spool into a drum, pull spool lever to fill drum,
take side plate off on right hand side, held on with about 6 bolts, look in and you will see 2 legs sticking up with 2 small holes at the top end, get someone to move the cab leavers while looking on, if no roller, the legs wont move, to fit new roller you have to easy the legs apart to get it in, if the legs are to wide that the roller is moving side to side, they need a nip together before fitting

Wrap a lenth of wire round the roller before trying to fit, saves thying to rescue it from under the pump

 

[multi power]

The OP says the arms don't drop even with engine stopped for some time, so I highly doubt it's a valve problem
I have yet to see a banner lane tractor that doesn't drop the arms when stopped

 

[MF-ANDY]

could be the roller has poped out on the lift linkage, the spring will pull into lift,l put i this would make it want to lift all the time, and go into constant pumping, and with the roller missing, the linkage would be doing nothing wherever put put the levels,
drain couple of gallon off the back end, easy way is to fit a short hyd pipe to a rear spool into a drum, pull spool lever to fill drum,
take side plate off on right hand side, held on with about 6 bolts, look in and you will see 2 legs sticking up with 2 small holes at the top end, get someone to move the cab leavers while looking on, if no roller, the legs wont move, to fit new roller you have to easy the legs apart to get it in, if the legs are to wide that the roller is moving side to side, they need a nip together before fitting

I know what you are saying about the roller but a 575 has a mk3 pump and the roller shouldn't be removable.

 

[Pennine Ploughing]

I know what you are saying about the roller but a 575 has a mk3 pump and the roller shouldn't be removable.

could it of broken?
what other cause would there be for the arms to stay up

 

[MF-ANDY]

could it of broken?
what other cause would there be for the arms to stay up

yes it could but op says it wont drop even when engine stopped. never seen a 500 series that wont drop over time. even with a selector valve in the wrong position i would expect them to creep down via cylinder leakage

 

[Bloders]

may as well just get stuck in and take the top cover off.
parts are not expensive whatever the issue is with it, so its not the end of the world.

 

[Accidental_Farmer]

Thanks all! As soon as I've shifted some hay and have room to do it in the dry I'll strip the old gal down and see what I can see!

@MF-ANDY - Yes your right the arms (and the loader for that matter) would normally creep down to the floor within half an hour or so under normal circumstances when the engine is stopped.

 

[MF-ANDY]

If it wont creep down at all I'm guessing you have something seized or jammed. Check all external pins and links including puh Rods if it has any before delving inside

 

[Accidental_Farmer]

The problems happened suddenly. The block would normally have crept down after about 5 minutes of stopping the engine. I've been away for a few days, and when I got home yesterday the arms had dropped and the block was on the floor (after about a week). As soon as I started the engine though the arms came right back up to the uppermost position, regardless of where the lever is in the cab.

I'll investigate further later.

Thanks

 

[MF-ANDY]

Where were the levers when it raised. If they weren't in the raise position I'm guessing stuck control valve. Check thro side cover

 

[vaxo yazarashvili]

Where were the levers when it raised. If they weren't in the raise position I'm guessing stuck control valve. Check thro side cover

my friend hello. I have same problem on arm lifts on my mf 6713 model and I think that it is control valve too. but I couldnot find it. can you tell me where it must be fixed on some diagram photo? and side cover what you mean for cheking?

 

[David Bliss]

Heat and the very small clearances might have shifted some residue and could have stuck the control valve. also have seen worn seals when they are pushed to there limit workout and get back into where you wouldn't think they could, a number of times some one borrows a trailer and contaminates its oil with crap from there neglected tractor,