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Fordson Tractors Discussion Forum

supermajor loader/ backhoe

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dano 210

09-18-2013 13:07:20

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i havea 1964 supermajor with front loader & backhoe. the loader &backhoe seemto work ok but it does not have enough pressure to dig changed filters still no help. any info on this topic would be a big help--- hopefully-- thanks Dan

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Robert Major

09-19-2013 19:05:09

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 Re: supermajor loader/ backhoe in reply to dano 210, 09-18-2013 13:07:20  
Hi Don't really have enough info here for diagnosis. It could be a leaking internal seal on the cylinder the spool might be leaking internally on the control block, the pressure relief valve is not set right, or the pump is worn. can you define won't dig for us a bit more, or what it has for pumps is loader/ backhoe 2 separate pumps. Does it have pressure relief on both control blocks loader/ hoe or just on the loader like on I've seen. what happens with the loader lifting heavy dirt or rocks when it's warmed the oil. Meaning is it different to the hoe output or the same. If the boom functions are left raised up do they creep down on there own quickly, without moving levers These things may help us figure it out a bit more
Regards Robert

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09-21-2013 19:09:34

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 Re: supermajor loader/ backhoe in reply to Robert Major, 09-19-2013 19:05:09  
Hi won,t dig, i mean it can,t lift full dipper full of sand. no rocks. now both boom & bucket valves for the front loader have pressure relief valves with acorn style cover nuts. the larger of the two being on the boom control valve (left side) whitch also has outlet pressure line to the backhoe. leak down is not to bad, some to be expected.both front and rear systems equally weak even with engine rpm,s at full throttle.relief valve or badly worn pump. what are your thoughts? dano.

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Robert Major

09-21-2013 22:56:35

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 Re: supermajor loader/ backhoe in reply to dano210, 09-21-2013 19:09:34  
Hi Dano From what I can make out you seem to be saying the loader and hoe have a pressure valve each. it would be unusual to have both valves weak and loader and hoe to both be bad with that, unless there is junk or rust in them or both springs are weak or something . I'm kinda thinking pump. But the only way to really go, is find a guy that can do a pressure and flow test with the oil hot. There are pressure and flow figures at so many rpm's on the motor for these tests, but I don't know what the outputs are for your machine so that needs finding out. You can just test pressure that is what you need to lift or dig. flow will just mean it moves slower than it should. But if your gonna do one do the other and then you know if the pumps heading south and if it's needing replacement soon!. They should be able to do pump outputs on it's own and then test the block output to the rams to see if the pressure relief is right also if the pump checks out good. This would be my next move with it then it takes all the guessing out and narrows it right down.
This will cost money but the gauges and parts are expensive to test it. if you only use the stuff once doing it your self. Plus you need to know what your doing oil under high pressure is dangerous, and you can damage parts too!. I'm just buying the test equipment as I need it more in my shop, and it will be $400 cheap way and probably over $1000 for the more expensive stuff so a couple hundred in someones pocket might be cheap with the knowledge too!.
Regards Robert

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dano 210

10-01-2013 15:09:25

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 Re: supermajor loader/ backhoe in reply to Robert Major, 09-21-2013 22:56:35  
hey robert; question; is there a valve in this system anywhere, that controls the max operating pressure for the loader & backhoe? if there is one, i cannot seem to find it. dano

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Robert Major

10-02-2013 18:43:11

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 Re: supermajor loader/ backhoe in reply to dano 210, 10-01-2013 15:09:25  
Hi There should be one on one, or both blocks. I thought you had found them. they are usually under acorn nuts. If the nuts you found have the acorn then another nut, between there and the blocks face/end/ side, what ever its screwed into, that is the valve. the acorn covers the adjusting screw and the second nut locks the screw in place when the pressures set.
Regards Robert

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