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Yanmar hydrolics

Ralph Shaffer Join Date: Posts: 1

2003-04-06          52671

I installed quick disconnects (two sets) on my bushhog front loader but when I disconnected it the motor wouldn't turn over as usual and ran with great difficulty. Some friends have suggested installing a bypass so the fluid still circulates, others say that it should not make any difference. Any ideas out there?

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Yanmar hydrolics

Ralph Shaffer Join Date: Posts: 1

2003-04-06          52672

One more fact, the Yanmar is a 1510D and there are two hydrolic lines hooked up to the front loader ....

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Yanmar hydrolics

bruce1966us Join Date: Jul 2003 Posts: 13 tennessee

2003-04-06          52680

The hoses have to be connected together so that fluid can circulate at all times. The problem with hard starting and rough running is because the pump is trying to pump the fluid but the fluid has a restriction.

Thanks,
Bruce ....


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Yanmar hydrolics

TomG Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley

2003-04-07          52703

Bruce's explanation sounds right, but it might be good to clarify description of the problem a bit.

Is that two hoses from the valve to the loader or from the tractor to the valve? I'm assuming they're from the tractor in which case they'd be the valve inlet and return hoses and Bruce's explanation is exactly on the money (some valves have two return hoses) .

Disconnecting either an inlet or return hose (the PB hose in the case of a two return hose valve assembly) means that the only place the pump can pump oil is through the systm relief valve line. The engine would act exactly as described.

It's not good to run a tractor in this state for long because the oil over-heats and will damage the pump. A solution other than having a short hose to connect the lines together may be to change the diverter valve from the auxiliary system to the remote system position. The hoses to the loader are bypassed in 'remote' and only the 3ph would operate. Not all tractors have diverters. The one on my Ford looks like a slot screw head located between two hoses that go the loader on a block that's mounted on the engine.
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Yanmar hydrolics

marklugo Join Date: Jul 2003 Posts: 281 Tifton, GA   Pics

2003-04-07          52712

You need to check your engine for hydraulic fluid"high Oil level in engine" You would have put exteme pressure on the pump and something would have to go. Either a shaft, seal, or key would shear. I ....

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Yanmar hydrolics

doctor Join Date: Jul 2003 Posts: 5 Turbotville, PA

2003-04-08          52797

Thank you gents. It's great to be able to come here for real answers. ....

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Yanmar hydrolics

TomG Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley

2003-04-09          52823

MarkL's suggestion is a good one. On my Ford the system relief valve is in the hydraulic manifold block so the pump would still have relief valve protection if a PB line were disconnected. Relief valve protection on my Ford is enough to prevent the damage Mark mentions, but the oil would over-heat and damage the pump if it were run for long. There's also no guarantee that all tractor hydraulics are the same as my Ford.

Thanks for the good comments. There are quite a few participants here with real answers. I'm more theoretical than real myself a lot of the time. I wonder if a guy on another board I dropped in to ever got a real answer? There was a plan to install a valve that seemed to have too many ports on it by plugging the one labeled PB. I hope the question didn't remain unanswered for too long.
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Yanmar hydrolics

marklugo Join Date: Jul 2003 Posts: 281 Tifton, GA   Pics

2003-04-10          52920

This has always been a problem for aftermarket loader manufacturers. The tendency is to run them all directly off the pump and back into the system. When disconnected running, a pump would develop "catastrophic failure". Eicher, when we developed loaders with TAS and Koyker, both had this situation. Now Eicher builds a bypass right after the pump and before the loader so that no real problems can occur. ....

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Yanmar hydrolics

doctor Join Date: Jul 2003 Posts: 5 Turbotville, PA

2003-04-12          53018

My hydrolic lines are apparently spliced into a piece of 1/2 inch copper tubing that comes out from under the engine. I am guessing that my aftermarket is run directly off of the pump. There is, however, a small adjusting nut under the tractor seat that I was told has something to do with the 3ph operation. For my case I think the bypass hose from TSC will have to do the trick. Thanks for the help. Ralph Shaffer ....

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Yanmar hydrolics

TomG Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley

2003-04-12          53025

I haven't heard of copper tubing being used for hydraulic line, which is something that might bear checking. The adjustment under the seat probably is the flow-control valve.

Most flow-control valves adjust the speed a 3ph lowers but don't affect the lift speeds. The valves are usually adjusted so a heavy implement doesn't crash to the ground when lowered or a light implement doesn't give you time for lunch.

The adjustment can be used a little more precisely for some moving and plowing operations. Virtually all 3ph's aren't held down. They can float up and over bumps etc. Adjusting the speed an implement comes back down after it goes over a bump can improve the results.
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