MF40 Side Shift Backhoe Actuator

[burgs]

Hi
I have a MF40 backhoe loader that I am about to reseal the swing actuator.
It is a side shift loader fitted with a Dowty actuator, the actuator sits above the backhoe swivel brackets not between them.
I have undone the bolts that hold the motor on the top bracket but it refuses to move other than about 1/16", is there a bearing in the uppermost bracket or does it pivot off the Dowty output shaft?
It would appear that to reseal the paddle seals I need to remove the unit from the tractor and take both the top and bottom plates off, there are no external oil leaks.
There is also a type of top hat that has a bracket mounted of it for hose support on top of the actuator that I cannot remove, so not sure what is underneath it, could the be a circlip.
I seem to be able to find plenty of information for the actuator that fits between the swivel brackets like on the MF52 and MF54 backhoes but not on the side shift models, even down loaded a manual but thinking the type I have maybe in it, to no avail.
Hoping someone out there can help.
Best Regards
Burgs

 

[burgs]

Hi
Is this a MF220 Davis Backhoe?
The photos I have seen so far of the MF220 have the controls and seat mounted on the backhoe but the rest looks similar.
The controls on my tractor are mounted on the tractor itself and the seat simply flips backwards to operate the backhoe.

The backhoe I believe was manufactured in Australia.

Burgs

 

[mecheng87]

Agcopartsbook shows Davis 210 backhoes and they have a similar look to yours the rotary cylinder is in your location and they show several several rotary cylinders perhaps you can identify yours. Not sure if there is different versions for Australia. Your 40 is certainly different looking sheet metal than the NA version

 

[mecheng87]

Burgs, if it is a Davis it looks like there is a 3/8" x 3-1/2" spirol pin securing the splined rotary output shaft to the mast assembly

 

[burgs]

Hi
Thanks for the reply.
I have a manual coming from the company that sold the seals to me, so hopefully more information forth coming.
The roll pin could be why it is not lifting off after undoing the nuts, not sure where it could be as there isn't much room, I will have a dig around while waiting for the manual.
I assume there is a bearing at the top (spherical I would imagine)
and one at the bottom, doesn't appear to be any movement in them that I can see.

Best Regards
Burgs

 

[mecheng87]

Did the manual arrive?

 

[burgs]

Hi Mecheng
Yes arrived today, still don t know what model the backhoe and loader are, but 144 pages covering whole tractor.
Only had a quick look at the manual, the manual has a complete remove, strip down, inspect, repair and refit section on the actuator.
I will need to attach my chain block to lift it off, pity I couldn t have got it in the shed under the crane.
The top hat section on the actuator with hose support is mounted to the actuator shaft, the shaft is tapered and keyed, so will rig up some way of applying load to the boss and a bit of quick heat to the tapered boss and it should pop off ok, might weld a nut on the bracket and machine up a pusher bolt to apply the load.
Burgs

 

[burgs]

Hi
Hydraulics in the manual don't show how the side shift works?
On my tractor there is a valve mounted on the inlet side of the 6 spool valve bank but I am not sure how this works other than, directing oil to the two locking cylinders when one of the 6 spools is activated, it either releases the locking cylinders or clamps them, either way I cannot get anything to happen?
The manual I have doesn't even show the extra vale or the two locking cylinders?
Must conclude from that that the manual is close but not quite correct for my tractor?

Burgs

 

[mecheng87]

Burgs, I went back to the Davis 210 on the parts book and I realize now that the swing cylinder has similarities but is not the same as yours, yours has two sets of fasteners that come up from the bottom. I did see on an old posting 2008 of classicmachinery.net that someone was looking for dowty seals and parts and it was noted that these were used on steelfab, inchgreen, and Massey backhoes, the posters were from England. Neat that the slide was locked and released hydraulically I think the Davis were manually locked in place with clamping bolts.

 

[burgs]

Hi Mecheng
The side shift being hydraulic lock would be good if I can get to work again.
The manual is actually 419 pages and by the look of the side shift it is manually locked, anyway got the most important part for the moment being the actuator.

Burgs

 

[burgs]

Hi
Ok finally got the rotary actuator off, fired up the old TEA20, I have a rough jib on it to lift things around, connected it to the actuator shaft, put weight on it and jiggled the motor back and forth, and it started to move then I could see why it was tight, there are two dowels fore and aft, then it just popped off.
Top bearing in the pivot is a self aligning spherical (OD) sealed bearing, splines look good.
You can see the two cut outs in photo that allow you to turn the bearing vertical to remove and fit, guess the same on the bottom.

Next is to strip down and see what it like inside, probably started this project back the front, should have done some through hydraulic test testing first off, we will see at least I will know the actuator is ok!
Burgs

 

[mecheng87]

Burgs, thanks for the update nice progress

 

[burgs]

Hi
Only got a few minutes tonight to split the actuator, looks like I have found the problem, half of the paddle seal is missing and the fixed seal is broken as well as the backups for the seals are gone all together.
Will post some photos later on.

Burgs

 

[mecheng87]

Well at least by finding a smoking gun you do not have to beat yourself up about not doing any of those hydraulic tests first

 

[burgs]

All back together after having to modify the actuator seals.
Swings good and stays in place.
Now the big problem is the two bolts that hold the top to the slide frame have broken, one had been broken for some time and the other was broken 3/4 of the way through, so had to separate the backhoe from the frame.
The plate holds the top in place and at some time had a 1/4 plate welded in place, this had worn through so in my wisdom removed the remains and welded a new plate in place.
Now I cannot get the backhoe to lock in place, it appears as if someone has added a bit of round bar to the blade that lifts up between the plate and wedges the backhoe into the locking grooves, least that is what it looks like, so now looks like i have to remove the whole lot again, do some measuring and make it work the way I think it was meant to?
Seems I cannot find parts book for this backhoe or any relevant information so boots and all in.
Burgs

 

[mecheng87]

Burgs glad to hear you got the rotary actuator repaired. Sorry you have more problems. I m curious when you log into AGCO parts book for your Australia region do you get other backhoe options besides the 52, 54 and Davis 210?

 

[Old_Man]

Hi Burg, mecheng87 said you had the same model MF40 as I have.

I am currently repairing a few small things on it, have ordered Manuals for the tractor as well. If I can help just let me know.

 

[andrejbr]

Hello,
I'm new to this forum. I have a good old MF50B bachoe at home. Everything was working perfectly until recently. At work, the hydraulic hose of the rotary actuator started to leak, that moves the arm to the left. After replacing the hose, however, the problems started.
Otherwise, the actuator works in both directions. When I let go of the command lever, the movement it stops, no matter which direction I move arm stop immediately. After a few seconds, if the bachhoe hangs to the left, the arm automatically starts to creep to the left. To the right, the arm rests even if the backhoe hangs to the right. I can't figure out what's wrong with the arm creeping to the left.
I have already checked the check valve, cross line relief valve, cushioning valve. I swapped the valves between them. I checked the command valves. The problem is definitely in the rotary actuator. If I place a pressure gauge at the connection point of the hydraulic hoses and manually move the arm, it shows pressure on the right side and the arm stops, on the left side there is no pressure and the arm travels freely.
I would be very grateful if anyone has any ideas what else could be wrong before I start disassembly the actuator.

Thank you.

 

[Jim.ME]

Hello,
I'm new to this forum. I have a good old MF50B bachoe at home. Everything was working perfectly until recently. At work, the hydraulic hose of the rotary actuator started to leak, that moves the arm to the left. After replacing the hose, however, the problems started.
Otherwise, the actuator works in both directions. When I let go of the command lever, the movement it stops, no matter which direction I move arm stop immediately. After a few seconds, if the bachhoe hangs to the left, the arm automatically starts to creep to the left. To the right, the arm rests even if the backhoe hangs to the right. I can't figure out what's wrong with the arm creeping to the left.
I have already checked the check valve, cross line relief valve, cushioning valve. I swapped the valves between them. I checked the command valves. The problem is definitely in the rotary actuator. If I place a pressure gauge at the connection point of the hydraulic hoses and manually move the arm, it shows pressure on the right side and the arm stops, on the left side there is no pressure and the arm travels freely.
I would be very grateful if anyone has any ideas what else could be wrong before I start disassembly the actuator.

Thank you.

Welcome to the forums.

It is best to start a new thread of your own with the info you have here. Tagging on to an old thread can lead to you getting answers or suggestions related something in the old thread, not your issues. These fellows might still be around but haven't posted for at least a year or more.