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waldersha 
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Joined: 30 Sep 2013
Location: Kansas
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 Topic: 170 loader settles- bleeding procedure
Posted: 13 Jun 2019 at 9:51pm |
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Hi all, I’m helping some folks get ready for their farm sale in a few weeks. They have a 170 diesel with a du-al loader. It was a bit low on hydraulic fluid, so I added some about a week ago when helping them. The issue is that the loader wants to settle when you raise it. Raise two feet, release lever, it will drop 6” then stop. It also seems to be lacking in lifting power. I was using it to pick up the front end of a gooseneck trailer today (flatbed 20’ unloaded) and had a hard time getting it off the ground.
I suspect air in the system from them trying to operate it low on fluid. I’ve run the loader through it’s full travel several times, but don’t seem to be helping. Any ideas?
Also, if anyone in the NE Kansas area is looking for a pretty nice 170 diesel, the sale is on the 22nd and I would be glad to provide details via pm.
Thanks in advance
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DrAllis
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Joined: 12 Sep 2009
Points: 21941
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Posted: 14 Jun 2019 at 7:12am |
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Lifting and lowering (cycling) the loader several times is all it takes to bleed the air from the system, so keep using it, and if it is still air, it will get better on it's own.
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
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Posted: 14 Jun 2019 at 10:08am |
Dropping 6 inches when you let go of the valve lever, sounds like a problem in the valve? I suppose it could be bad seals in the lift cylinders too if it has 2 way hydraulic cylinders. With pressure on the back side of the piston and the front side dumping to the sump, I guess it could drop when pressure is released, until pressure on the back side builds to equalize after the valve is closed. Bad piston seals would cause a weakening in the lift capacity also.
Edited by CTuckerNWIL - 14 Jun 2019 at 10:09am
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waldersha
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Location: Kansas
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Posted: 14 Jun 2019 at 11:16am |
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Thanks fellas. I think there could be elements of both going on. I’ll keep putting it through it’s paces.
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DrAllis
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Posted: 14 Jun 2019 at 11:39am |
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Switch hoses from bucket to boom and see if the problem follows the hoses or the valve.
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waldersha
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Location: Kansas
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Posted: 14 Jun 2019 at 6:09pm |
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Was going to do that today but don’t have enough hose to reach across unfortunately. Is it normal to have to idle them up quite a bit ?,I’m used to my series 1 17 and 45s, but if I sped the engine up substantially, it lifted better and seemed like it held a little better
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DrAllis
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Posted: 14 Jun 2019 at 6:17pm |
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You ain't running a WD45 anymore. Throttle it up until it performs like you think it should.
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MACK
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Posted: 14 Jun 2019 at 8:54pm |
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The tractor valves have a load check valve and spring that keeps it from dropping when you pull the lever. Might work the same when you release the lever. Never had to deal with a load check valve problem before. MACK
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