Cat 910 loader, low trans pressure

Thank you for the reply, I will check that out tomorrow

Well i took the control valve completely apart that the pump is bolted to. Everything looked fine as far as I could tell. All the springs were intact and none of the spools were stuck or anything. Also I took the neutralizer valve apart and everything looked good in it. I have pressure to the neutralizer valve and when I push the left pedal down have oil returning from it to the trans housing.

For information I tested the primary clutch pressure on the pump. The book says it should have 60 psi at full throttle and it does. At idle it has 25-30. This is the same exact pressure reading I get at the port to check pump pressure. Does that mean anything, or does anyone have any other ideas of things to check? Thanks in advance!

Don't know how much this has to do with it but the instructions say to remove plug "C", the one in the yellow section on your valve while checking primary pressure.
There are also two additional valves to check, the neutralizer signal valve and the neutralizer safety valve. Did you check both? Not a good idea to be running unit with such low pressures as your surely starving lubrication system pressure.

Thank you for the reply. I did have the plug (c) removed when checking primary clutch pressure.

The only neutralizer valve I have found so far is the one at the bottom of the left hand neutralizer/brake pedal. I’m not sure which one of those valves that is but it has a pressure line coming from the pump in the transmission and a return line to the trans case. I saw the other neutralizer valve in the diagram but have not been able to locate it yet.

I’m only running it long enough to try and troubleshoot now. It will move in forward gears but hesitated to move in reverse and won’t move at all in reverse if In a bind at all like trying to turn or back up a small incline.

Thank you for the reply. I did have the plug (c) removed when checking primary clutch pressure.

The only neutralizer valve I have found so far is the one at the bottom of the left hand neutralizer/brake pedal. I’m not sure which one of those valves that is but it has a pressure line coming from the pump in the transmission and a return line to the trans case. I saw the other neutralizer valve in the diagram but have not been able to locate it yet.

I’m only running it long enough to try and troubleshoot now. It will move in forward gears but hesitated to move in reverse and won’t move at all in reverse if In a bind at all like trying to turn or back up a small incline.

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Thank you for the reply Eddie. I am away from my book tonight but will post a couple pics I have on my phone. And get more tomorrow.

Thank you very much for the explanation of how the control valve works and starts to fill and engage the clutches. I’m not much of a mechanic. I have the oil flow diagram but still didn’t completely understand how everything worked. I couldn’t figure out how pressure ever moved the load spool. 

That orfice you speak of sure sounds like it could be the culprit. I wonder if it is number 11 in this oil flow diagram. I removed what the book calls the “slug” number 12 but at the time didn’t realize there was an orfice above it so didn’t check it.

I will get better pics from the manual tomorrow. Thank you all for the help!

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