early industrial ford 3000 backhoe issues help thoughts please

I just bought a ford 3000 backhoe in really good shape for year, I'm guessing around 1970 model. I used the hoe first time yesterday I dug a big whole to bury a burn pile of garbage. it digs strong like you would expect. but I tried to use the hoe to push myself forward. as I dug like iv did on every hoe iv ran. but to my surprise it doesn't have the strength to push the tractor. but can pull itself with ease. I thought well not end of world at least I can use it as is. as it will boom straight out with a bucket of dirt. but later in the day I got off near creak and got lightly stuck. should have been able to push it out with ease, but nope wouldn't push its self with hoe at all. after trying like hell I had wiggle around enough the front wheels sunk down in the ground. so I grabbed some blocks to use the front loader to pick the front up to put ramps under front tires for I could just pull it out. this is were it gets puzzling the loader wouldn't left the front end, so I decided to try and extend the hoe straight out with out riggers up. to hopefully raise the front end up, will that wasn't enough weight but what I discovered was with the back hoe straight out, the front loader was strong and could throw its self upward with ease, with boom hoe in the up position. the front loader will still raise its self up and down but no strength to pick up front of tractor, I extended the hoe back out straight except this time I picked up the rear with it for all weight would be on front. still the loader lifts the front with ease like it should. its full of fluid checked and have tried to get more in it. the pump is mounted on front of tractor the feed runs back to the spool valves on hoe. then the return on that spool runs forward and feeds the loader control spool valve. then the fluid goes threw it and returns to tanks. any ideal on what could possible be going on for the life of me I can't understand, how the hoe being extended fixes the loader issue. as after you get done extending the hoe out, the spool valves are returned to the same position as if the boom was up. also sometime the rear boom will have some pushing strength but most the time not. I'm guessing this would be a open loop system, so it would seem with the return feeding loader. that there would have to be a restriction happening at the spool valve on hoe to be effecting the loader. but I can't figure out how the hoe position could be having a effect on flow to the loader as there is no hoses getting pinched off. any ideals? all hoses on machine are new and the rear spool valve is rebuilt and pump is new, all did by the guy I bought from. I can't help but think he was trying to correct this issue and gave up. any ideals would be great.

730 loader and 753 hoe on a 3400? 735 and 753 on a 3500? Just trying to see exactly what you have, I have spent thousands of hours working on the 1965-1975 Fords. You have individual reliefs for some functions. Just thinking out loud, I'll post more later, no time now.

Welcome to HEF, jhutch !

mitch504 said:

730 loader and 753 hoe on a 3400? 735 and 753 on a 3500? Just trying to see exactly what you have, I have spent thousands of hours working on the 1965-1975 Fords. You have individual reliefs for some functions. Just thinking out loud, I'll post more later, no time now.

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It’s a 753 hoe it’s on a ford 3000 it was originally on a 3500 but the original 3500 had transmission issues so guy swapped all backhoe and loader parts over on the 3000 including front end. After running the machine more, I have figured out if I don’t boom all the way in with hoe say leave 3 inch of travel in the push cylinder on hoe, it will push the hoe just like it should but if you boom all the way in and raise it up it won’t push it. After figuring this out I’ve been happy camper. But the issue with front loader not always lifting the front end remains, some times it raises front end some times no. I believe it’s in the loader spool valve as the main return feeds into it and returns into oil tanks. When it won’t raise the front I hear what sounds like flood rushing threw the return back into the tanks, so I believe the control isn’t doing it’s job but I don’t understand why it doesn’t do it all the time. I thought about pullin it off and taking it apart and clean and inspect it, but as of now I hate to miss with it because when running it, I only notice issue when out riggers are down and I go to use bucket to raise front end to level it, some times she lifts some times no. If I knew for sure what to fix I would but I don’t.