Farm Equipment - 170 loader settles- bleeding procedure

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170 loader settles- bleeding procedure

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Category: Allis Chalmers
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=161897
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Topic: 170 loader settles- bleeding procedure

Posted By: waldersha
Subject: 170 loader settles- bleeding procedure
Date Posted: 13 Jun 2019 at 9:51pm

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

Replies:

Posted By: DrAllis
Date Posted: 14 Jun 2019 at 7:12am

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.

Posted By: CTuckerNWIL
Date 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.

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Posted By: waldersha
Date Posted: 14 Jun 2019 at 11:16am

Thanks fellas. I think there could be elements of both going on. I’ll keep putting it through it’s paces.

Posted By: DrAllis
Date Posted: 14 Jun 2019 at 11:39am

Switch hoses from bucket to boom and see if the problem follows the hoses or the valve.

Posted By: waldersha
Date Posted: 14 Jun 2019 at 6:09pm

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

Posted By: DrAllis
Date Posted: 14 Jun 2019 at 6:17pm

You ain't running a WD45 anymore. Throttle it up until it performs like you think it should.

Posted By: MACK
Date Posted: 14 Jun 2019 at 8:54pm

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