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170 loader settles- bleeding procedure

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waldersha View Drop Down
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Joined: 30 Sep 2013
Location: Kansas
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Post Options Post Options   Thanks (0) Thanks(0)   Quote waldersha Quote  Post ReplyReply Direct Link To This Post Topic: 170 loader settles- bleeding procedure
    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
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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post 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.
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CTuckerNWIL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post 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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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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waldersha View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote waldersha Quote  Post ReplyReply Direct Link To This Post 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.
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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2019 at 11:39am
Switch hoses from bucket to boom and see if the problem follows the hoses or the valve.
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waldersha View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote waldersha Quote  Post ReplyReply Direct Link To This Post 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
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DrAllis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post 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.
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MACK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post 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
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