Branson 3510i hydraulic problems

[btsavage]

When I run the hydraulics at max RPM there is some improvement but not nearly enough to work the tractor. For example, at idle, the loader will not move. At max rpm, it moves the full range empty, but will not move with a light load (manure) in the bucket. The dealer is leaning toward a bad pump. I ordered a gauge to install inline on the output of the pump, but it won't be here until tomorrow.
If it is a pump, has anyone had any experience using an aftermarket pump, such as those sold at surpluscenter.com ?

 

[J_J]

Did you remove and clean the relief valve?

If you want to isolate the loader valve, take the loader IN QD and plug it into the loader PB QD, and this will bypass the loader valve and then if the BH works, the pump is good.

If still no or little flow, you can check pump flow into a bucket.

If the pump can pump 1 gal in 6 sec, you have at least a 10 gal pump.

 

[btsavage]

I got the pressure gauge today and picked up the wrong adapter so I couldn't check it. However I pulled out the relief valve and checked it out. Not much there. A spring and a flat washer type thing at the bottom? It looked clean. Could the spring be weak?
I had the hose coming into the loader control valve off. I cranked it over and got a solid stream of hydraulic fluid over my head and the rops.
I put it back together and ran it for about two minutes. Same symptoms. However I did notice that the pump was hot. There is a second pump for power steering mounted in front of the pump that was cold to the touch.

 

[J_J]

What you describe does not sound like a relief valve, more like a load check.

A relief valve is going to have an adjusting nut, springs and o-rings, or some small flat washes to adjust pressure.

You appear to have pump volume.

Does any hyd valve work?

 

[btsavage]

Here is a pictures of the loader valve. What's took apart was the component on top to the right of the lever in the photo.


https://drive.google.com/open?id=0B0Kd3Ft18p1DbExMTTl2SHU5T3M

 

[btsavage]

Just got off the phone with the Branson dealer. They are telling me that they think it is the hydraulic pump and/or the drive gear. Apparently this is a big job and half the engine has to come apart. Anyone else ever deal with this?

 

[Leejohn]

Where is the pump that you have to pull half of the tractor apart?

 

[J_J]

You never said if the 3pt works normal.

 

[btsavage]

The 3ph seems to work but I have the arms off for the backhoe frame right now. The pump is easy to get to on the side of the engine. Branson dealer thinks it's the drive gear which runs off the timing gear and powers both pumps. That gear replacement they tell me requires the front of the engine to come apart

 

[Leejohn]

Thats right if the drive gear is broke.