Backhoe Backhoe hydraulic connection

[pycoed]

I just bought a UTB ( Long) 445 DT (4 WD) which has a FEL with spool controls in the cab, plus a single rear hydraulic Q/D outlet. I want to run a backhoer on this, which has two hydraulic pipes marked in & out. Assuming the "in" pipe is connected to the rear outlet, where should I connect the "out" pipe from the backhoe controls?

Cheers
John L

 

[Farmerford]

John L:

When you say a "single" rear Q/D outlet, do you mean there is only one Q/D connector for a single hose?

 

[jpm]

there should be two qd one will be pressure the other is return

 

[pycoed]

John L:

When you say a "single" rear Q/D outlet, do you mean there is only one Q/D connector for a single hose?

Yes that's right, just the one at the rear.
In the cab to the right of the seat in front of the TPH /draft control quadrant is a factory fitted (I assume, because it's painted the same blue as the transmission, engine etc) lever that moves a valve under the left front of the seat. This has to be held down to get the FEL controls to work. If you hold this in position against the spring loading, then the three remotes for the FEL spool valves work fine. I think the return from that setup runs back into the cab & up under the seat in to a tee at the top of the transmission. On the other end of this tee is a quarter turn ball valve - this I assume was fitted by one of the previous owners. This ball valve is turned off & no pipe is connected to it.
I'm guessing that the factory lever if pulled up against the spring will send fluid to the rear Q/D outlet so may need to be held up to get the backhoe controls to work, but then I need to plumb in a return somewhere.
(You may have guessed this is my first tractor apart from 4 Wheelhorses!)

Thanks for the response - hope you can enlighten me

 

[Farmerford]

John:

It sounds like your tractor uses the transmission case for a hydraulic reservoir (the pump may be in the transmission case or mounted on the engine with lines to the transmission case).

In either event, the spring loaded valve you mention must be a one-circuit selector valve that directs the pump outflow to one of three places. When it is in neutral, flow is directed to the three point hitch. When depressed, flow is directed to the FEL. When raised, flow is directed to the rear outlet.

What doesn't make sense is why you have to hold the selector valve in the depressed or raised position. Perhaps the valve has a detent that normally holds against the spring when you move it all the way to the limit. You may not have been pushing hard enough. Or perhaps the balls in the detents are worn or otherwise not functioning.

In any event, the previous owner must have used the Tee fitting on the transmission top as the return line for the rear remote connection. What doesn't make sense about that is why he didn't run a separate line from the tee to a companion quick disconnect so that both lines to the rear remote could quick disconnect. Perhaps it was just a quick make-do job (I have frequently been guilty of that myself).

In any event I think you are correct that the return line from the backhoe connects to the tee. If I were going to remove the backhoe from time to time, I would put a quick disconnect in that line as well.

 

[pycoed]

John:

It sounds like your tractor uses the transmission case for a hydraulic reservoir (the pump may be in the transmission case or mounted on the engine with lines to the transmission case).

In either event, the spring loaded valve you mention must be a one-circuit selector valve that directs the pump outflow to one of three places. When it is in neutral, flow is directed to the three point hitch. When depressed, flow is directed to the FEL. When raised, flow is directed to the rear outlet.

What doesn't make sense is why you have to hold the selector valve in the depressed or raised position. Perhaps the valve has a detent that normally holds against the spring when you move it all the way to the limit. You may not have been pushing hard enough. Or perhaps the balls in the detents are worn or otherwise not functioning.

In any event, the previous owner must have used the Tee fitting on the transmission top as the return line for the rear remote connection. What doesn't make sense about that is why he didn't run a separate line from the tee to a companion quick disconnect so that both lines to the rear remote could quick disconnect. Perhaps it was just a quick make-do job (I have frequently been guilty of that myself).

In any event I think you are correct that the return line from the backhoe connects to the tee. If I were going to remove the backhoe from time to time, I would put a quick disconnect in that line as well.

Many thanks - I was re reading my posts & wondering if anyone could make any sense of them! You seem to have grasped it straightaway - I'm really impressed.
The vendor told me the hydraulics were a little unusual & the operation of this selector valve certainly prove that - it's not so bad to hold the lever down with your calf so you can use the FEL controls, but I'd have to use a bungee to hold it up when I'm using the backhoe.
I'll go ahead & plumb in another Q/D outlet at the rear, routing back to that tee fitting, at least that & a bungee & I can start using the backhoe.
I'm pretty sure this selector is intended to be spring loaded, & it does seem to be the factory fitted option, there may be another tapping I could use on the hydraulic head under the seat, but I guess I need someone who knows Long/UTBs to advise on that. There are a couple of these advertised for breaking in a yard about 50 miles from me - I must give them a ring (I need a lower grille anyway)

Thanks very much for the info