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Massey Harris & Massey Ferguson Tractors Discussion Forum
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cracked hydraulic cover plate

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Graham Rebbeck

03-20-2004 00:47:28




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The main cover plate under the seat of a 1957 Massey Ferguson 35 dsl. has cracked. The crack opens when the hydraulic arms are raised. A mechanic says its because the draft leaver was activated with a blocked by-pass valve causing the pressure to back-up. Two questions then... how hard is it to fix the valve and can this cast cover plate be successfully welded? The plate now has two cracks, one from either side about to meet in the middle.

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Graham Rebbeck

03-21-2004 15:14:55




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 Re: cracked hydraulic cover plate in reply to Graham Rebbeck, 03-20-2004 00:47:28  
Thanks for the help. It's my neighbours tractor and he is delighted with the assistance. He says the hydraulic cover plate seemed to lift and crack when he played with the draft controll and hydraulics. (It already had one crack and traces of an old weld.) The arms raised above normal level and the motor seemed to strain. Could this reflect a stuck by-pass valve somewhere or is this a normal function of the draft controls on the 35?

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sibby(aus)

03-20-2004 14:24:35




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 Re: cracked hydraulic cover plate in reply to Graham Rebbeck, 03-20-2004 00:47:28  
fellas,i have seen them cracked through the rocker shaft section also,but mainly where lever quadrant goes through.what about oil galleries as thomas states,could you successfully repair and seal in 2500-3000 psi.i agree securing bolts likely came loose and caused problem,90% of times user had back blade or similar long overhang implement on tractor when it happened.notice the securing bolts always loose also.

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Thomas

03-20-2004 10:44:38




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 Re: cracked hydraulic cover plate in reply to Graham Rebbeck, 03-20-2004 00:47:28  
It's a common MF fault which occurs if the lift head bolts become loosem, I've never seen one cracked due to excess pressure and it sounds unlikely. The lift head itself is not strong enough to carry the load from the linkage on its own, it relies on the strength of the structure of the centre housing. If the lift head becomes loose the structural strength is lost and a good shock load can crack it. The only sure way of preventing this, particularly on the 4200 series tractors which go up to 5 tonnes with a very similar setup is to clean the faces, prime with Loctite 7070 cleaner and seal with loctite 509 (no gasket). I don't recommend this on the smaller tractors as subsequent removal of the lift head requires considerable amounts of heat to melt the loctite, and a long scaffold pole! As to whether yours could be repaired, I doubt it being as it has cracked through the oil galley. I don't know whether they are still available from MF, I saw a new TAFE tractor last year which is virtually an old 35 with plastic pannels so it would not be impossible to get one. Then again you might be lucky and get a second hand one although being a common fault you might not...

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sibby(aus)

03-20-2004 01:52:12




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 Re: cracked hydraulic cover plate in reply to Graham Rebbeck, 03-20-2004 00:47:28  
graham,never seen one welded yet.better off to remove your lift cover and replace with a s/h unit. quicker and less costly.



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rusty13

09-07-2004 14:44:08




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 Re: Re: cracked hydraulic cover plate in reply to sibby(aus), 03-20-2004 01:52:12  
Sibby,

You have answered a lot of the MF hydraulics questions over past months, and I have one nobody has responded to. So am trying to reach you directly (open to all, of course!).

I think I overloaded my MF-35 (2-stage clutch) 3-pt hitch with a 6 ft wide x 4 ft deep home-built carrier carrying rocks over rough terrain causing bouncing and front end to rise on uphill climbs.

Lift started to slow down, then stopped working except when using 6' blade; now it won't even lift that. Empty arms will lift and fall, but not with any load at all. They start to move, then some minor pulsing, then they stop. They don't drop, but don't rise further.

If I raise them without load, put more than 185# (my weight) on them, they start to fall slowly.

Nothing is cracked, loose or broken on the outside that I can see. Oil is full at dipstick and clean. No odd noises coming from pump or elsewhere.

Manuals bought on YT have such poor quality photos that written descriptions are not enough for this amateur.

Any sugestions for step-by-step, progressive diagnosis?

Thanks very much.

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Chip S

03-20-2004 06:31:39




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 Re: Re: cracked hydraulic cover plate in reply to sibby(aus), 03-20-2004 01:52:12  
Had the same problem with my 65. Cracked right across the top where the lift arm shaft comes out. Wasn't caused by hydro pressure, but by not having the cover seated properly on the trans housing. Welded it just fine, strong as ever
Bear in mind this is a cast part, so you'll need to pre-heat and pack the part in sand or blankets to cool it slow, or you'll develop cooling cracks. Use a nickel rod, specially made for welding cast iron. Take your time in setting up the repair, and vee out the cracks real well for good weld penetration. Use a stitch technique so the part doesn't develop too much heat.I had a machine shop deck the bottom so it would be perfectly flat when it was remounted. I figure I saved $300-400 for a used part.
Good luck

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