2010 Hydraulics--no pressure.

[2010OWNER]

Hey Guys,
I just drug home the neighbor's 2010 crawler to work on. It has no pressure to run the blade. HLR transmission works fine. 2010's have the auxillary hyd. pump mounted on the front of the transmission, unless they're a bucket loader.

Before I split the crawler in two, I'll check the filter and screens. Any other places to look? I have my doubts that it has anything to do with the filters/screens, as the transmission isn't showing any symptoms.

Has anyone had the experience of the auxillary hyd. pump just quitting? I've never had any trouble with mine.

Brian

[Stretch]

You don't have to split the crawler to remove the pump. It will come out the access hole no problem. Did you make sure the disconnect for the pump wasn't engaged?
Stretch

[Stan Disbrow]

Hi,

Yeah! That's a 'DOH' moment for sure!

Stan

[2010OWNER]

Thanks,
I was just reading the manual and found out I don't have to split the machine. That makes things easier.
On the HLR, there is no separate disconnect for the pump. When the engine clutch/cold weather start lever is engaged it shuts everything down past the flywheel.
What I find strange is that there is absolutely no flow to the valve for the blade. I'd think there would be a little something, even if the pump was badly worn. It is acting like the pickup tube is completely blocked, or the pump drive is busted. I'll be looking hard at the intake system; I think that is more likely than a problem with the drive.
I'll keep you posted.
Brian

[2010OWNER]

I drained the transmission, the oil was a light shade of chocolate brown. The steel mesh filter had a minor amount of debris stuck to the outside. When I pulled the paper filter I found the bottom 1/2" blown out all the way around.
I suspect the missing paper to be problem with the hydraulic pump.
If I pull the pump and blow out the pickup, how do I get the paper flakes out of the transmission?
Brian

[2010OWNER]

Just an update:
Before I pulled the pump, I flushed the transmission with 5 gallons of diesel. I ran the engine at idle with the pump outlet hose disconnected. Diesel was pushed out and made a mess (I didn't have the fittings to run it into a bucket). It came out kind of splashy and not under much pressure, but diesel is much thinner than hydraulic oil. I only ran it a minute or two.

After draining the diesel out of the transmission I pulled the pump. I found nothing wrong. Spinning the shaft back and forth didn't show anything out of the ordinary. Gear and idler spun normally. I tried to turn the pump drive shaft on the transmission by hand, but it didn't want to turn either way.

I put the pump back on and am still getting nothing out of it. With the engine running; cracking a connection on the pump outlet hose, almost to the point of disconnection, results in a leak smaller than a pencil.

I didn't dismantle the pump as it felt just fine; could the woodruff key have sheared but still bind enough to not show up when the pump is spun back and forth by hand? Could the pump drive on the transmission have failed somehow? I don't think the pickup is blocked, I don't see any indication the pump is cavitating: no noise, no air bubbles.

Any suggestions?

Thanks,
Brian

[Stretch]

Don't know everything you have done or inspected but,
I would have probably disassembled the pump while you had it out.
From your description it sounds as if the pump is not working at all. If my memory serves me well the pump is driven off a counter shaft in the transmission, hence you would not be able to easily rotate the pump drive. I would look for a key sheared on one of two impellar shafts or the bypass being stuck. These are fairly simple pumps to rebuild. As long as the impellars and shafts are in good shape you should be able to rebuild the pump with no problem.
Good luck

[2010OWNER]

10/25 Update

I pulled the pump back off and opened it up. No keys sheared, no bad teeth, and all the clearances were tight. I double checked the power shaft out of the transmission and couldn't identify any problems there.

Using a chunk of garden hose and a clamp, I managed to get some air pressure to blow out the pump intake. I also blew out a couple of small holes that went back into the transmission. I'm not sure what they were there for.

I reinstalled the pump, filled the transmission, and started the crawler. No leaks and the pump was again working.

Bottom line is that there must have been a blockage caused by the filter disintegrating. I'm going to have to drain the transmission again to see if anything comes out.

What a learning experience!

Brian