International 2500B Loadef Backhoe

[PineRiverPat]

Hello Again. I have another question about the old machine. First I thank everyone that replied and helped me so far. Tremendous help.
I got this old guy running again after putting a camshaft and oil pump gear in it. Replaced the head gasket and radiator. I can’t believe it still runs.
So, it’s the backhoe. It don’t wanna work. When I move any one of the levers it sounds like it wants to but doesn’t do anything. Does this guy have 1 or 2 hydraulic pumps in it? I was under the impression that there was 2. One for the loader and one for the backhoe. I HOPE I’m wrong.
The loader seems to work fine. Lifts and tilts the bucket ok. The steering works fine.
So if there is only 1 hydraulic pump on this guy then I’m guessing maybe one of the pressure lines to the valve body for the backhoe may be at fault. Plugged up or full of ice. ??
Any thoughts and or advice is GREATLY APPRECIATED. If I can get this old guy to do some work again it will be so rewarding.
Thanks and hope everyone has a good weekend.

 

[JimB2]

There maybe a second hydraulic pump under the right foot rest that is mounted on the side of the tran/diff case.
It has it's own hydraulic filter and the hydraulic dipstick should have a scribe on it higher up than the hash marks and that is the full level when an external pump is mounted under the right foot rest. Sometimes there was an external pump mounted to the front of the tractor with a driveshaft connected to crankshaft pulley but I believe this pump was rare and more common on the 2414, 2444 series tractors.
There may also be a valve that changes flow from the stabilizers to the hoe? Many different configurations.

 

[PineRiverPat]

There maybe a second hydraulic pump under the right foot rest that is mounted on the side of the tran/diff case.
It has it's own hydraulic filter and the hydraulic dipstick should have a scribe on it higher up than the hash marks and that is the full level when an external pump is mounted under the right foot rest. Sometimes there was an external pump mounted to the front of the tractor with a driveshaft connected to crankshaft pulley but I believe this pump was rare and more common on the 2414, 2444 series tractors.
There may also be a valve that changes flow from the stabilizers to the hoe? Many different configurations.

JimB2. Thank you for the reply here. There is what I believe to be a pump under the right footrest next to the canister filter. There is no pump on the front of the motor. I’m wondering if there is any internal pump in this guy that would run the loader as it seems to work fine. Or if this pump on the side by the canister filter would run the loader and back hoe. I’ll attach a few pictures.

There maybe a second hydraulic pump under the right foot rest that is mounted on the side of the tran/diff case.
It has it's own hydraulic filter and the hydraulic dipstick should have a scribe on it higher up than the hash marks and that is the full level when an external pump is mounted under the right foot rest. Sometimes there was an external pump mounted to the front of the tractor with a driveshaft connected to crankshaft pulley but I believe this pump was rare and more common on the 2414, 2444 series tractors.
There may also be a valve that changes flow from the stabilizers to the hoe? Many different configurations.

JimB2 Thank you for the reply. Your help is greatly appreciated. I guess what I’m trying to ask is it possible there is an internal pump I’m not seeing? Or would the loader AND backhoe be running off this pump on the side by the canister filter? I’m attaching some pictures. There is no pump on the front of the engine. The oil on the dip stick is between the 2 scribe marks. Maybe I am a little lie yet on oil. Thank you again.

 

[JimB2]

Hi, disclaimer, never owned or worked on a 2500B but have experience on the AG model 684 that is the tractor part that the 2500B is based on.
First see your dipstick, see that "|" mark about an inch or so above the current oil level, that is the required level for a 2500B with a side mounted pump. If the oil is not up to the "|" mark the external pump may not prime.
Yes there is an internal pump that will run the Power Steering and brakes and probably the loader, trace the input high pressure hydraulic line feeding into the loader control valves see if it comes from the area on the left side of the trans/diff case by the internal pump hydraulic filter in the canister on the side of the trans/diff case.

I don't have a manual for the 2500B but have a manual for a 270A which is a newer model with a larger engine and a torque converter drive for the transmission. I am posting a couple photos below from the 270A manual about the hydraulic flow, ignore the Torque Converter part.
The 270A had some kind of a valve (bottom left of 1st photo) that combined the output flow of the internal pump plus the output of the external pump to feed the backhoe valve bank and the loader valve bank but I believe the 2500B did not have that combining of the two pumps.
I think internal pump ran the PS, PB and loader, external ran the backhoe only. Could be wrong. Hope this helps.