Hydraulic leak question while plowing

[ShawnAgne]

Finally had a chance to use the plow. All was working great. I noticed I lost my hydraulics so I pulled it in the barn. Have some loose fittings so added some oil, started the tractor back up and it sprayed hydraulic oil (milky white) up around the pump area. Guessing I just blew a gasket or something up around there. Any idea as to the cause or just old age? Cub has a 184 motor on it and I've added the bypass block with a valve to actuate the blade.

[artc]

there are two o rings that attach the pump to the piping on that end. you'll probably need to replace them, guessing that's where the oil is coming from.

nothing special about them but I don't remember number...just match it up at NAPA

[artc]

probably should change oil as well. milky white indicates water in the oil from condensation

take good care of my motor

[Dale Finch]

It is fairly common, as well, to have a cracked line where the tubing is joined to the mounting flange at the pump end. It's hard to see, especially if it is painted. I've had 3 that were like that. Those tubes sometimes have some torque on them when mounting, trying to line up the bolts, plus many years of vibration.

[Glen]

Hi,
Here is a listing for the o rings at TM Tractor.
I remember that you added more parts to the hydraulic system. Are you sure everything is hooked up correctly, so it is not building up too much pressure somewhere.
I think bubbly looking fluid can mean that it has air in the fluid.

http://www.tmtractor.com/new/hy/751fp.htm

[ShawnAgne]

probably should change oil as well. milky white indicates water in the oil from condensation

take good care of my motor

Art, trust me I'm going to take good care of it. Runs like a champ and its night and day difference. Do the bypass blocks sold by TM Tractor bleed off excess pressure? David had mentioned this and thought I'd ask before calling them.

[ScottyD'sdad]

What type of control valve are you using, with the bypass block.?You need an "open center" valve, on cub hydraulics. "Closed center" valves, block the line, and cause pressure to build up.
Ed

[Eugene]

All of previous suggestions are good.

If you have a lot of air in the system, the hydraulic pump will whip the air and hydraulic fluid into a froth.

My thought. Make sure you have some hydraulic fluid in the touch control. Leave the fill plug out. Clean up the mess. Crank the engine over for 5 or 10 seconds without starting the engine. Wait for 5 or 10 minutes, then crank the engine over again. This should remove any air bubbles from the hydraulic oil.

Have a helper operate the tractor's starter without starting the engine. Engine being cranked over, check for fluid leak location.

My guess, failed O ring on high pressure side of pump. Also like Ed's suggestion, need open center control valve(s).

Edit: Previous discussion on home made log splitters.

viewtopic.php?t=47371#p391696

[ShawnAgne]

What type of control valve are you using, with the bypass block.?You need an "open center" valve, on cub hydraulics. "Closed center" valves, block the line, and cause pressure to build up.
Ed

Here is the valve I am using.
http://www.northerntool.com/shop/tools/ ... _200416981

Just saw where it was a "tandem center" valve. Called and talked to an engineer at Brand he said the valve is fine. However told me to check plate to make sure it is a tandem valve and then open it up to make sure it isn't closed. He said though the issue I described does sound like it was water.

Ordered the pump gasket kit from TM this morning.

[Don McCombs]

CUB HYDRAULIC PUMP PARTS.pdf

(86.9 KiB) Downloaded 508 times

[ScottyD'sdad]

What type of control valve are you using, with the bypass block.?You need an "open center" valve, on cub hydraulics. "Closed center" valves, block the line, and cause pressure to build up.
Ed

Here is the valve I am using.
http://www.northerntool.com/shop/tools/ ... _200416981

Just saw where it was a "tandem center" valve. Called and talked to an engineer at Brand he said the valve is fine. However told me to check plate to make sure it is a tandem valve and then open it up to make sure it isn't closed. He said though the issue I described does sound like it was water.

Ordered the pump gasket kit from TM this morning.

I'm not familiar with a "tandem center" valve, so i can't help you.
Ed

[Jim Becker]

That valve will work. However, you need to back off the relief pressure to 1,100 to 1,500 psi. Otherwise, you could effectively dead head it (may be what you already did!).