Hydraulic issues

NWMO 901 SOS

Well-known Member
Hey all,

Long time since I last visited. The 971 is doing pretty well, but while brush hogging some relatively rough timber paths, the hyds quit on me. I drug the mower up and got it off and then dropped the one arm loader. Both the three point and the auxillary control valve were "pulsing" during operation, before quitting all together last night. While not noted with the three point lift, the front bucket was significantly slower to respond as well.

After sitting over night, the three point did lift this evening, but is still pulsing. I've searched here some and glanced at the manual.
I'm sure my cam follower pin is worn, but seeing the pulse in the front bucket as well seems to point to the pump or an associated valve. I should also mention the bucket would not drop or "unload" either.

Hoping to give some hay rides over Thanksgiving, will get some pics. Heck, I might even throw the front weight box on:)

TIA,

Chris
 

I'm guessing it's time for a pump overhaul. Is your loader bucket a hydraulic dump? I thought those were all trip buckets. I'm guessing one does not need hydraulics for hay rides. :lol:

Blessed Thanksgiving, Chris!
 
(quoted from post at 01:11:00 11/22/16)
I'm guessing it's time for a pump overhaul. Is your loader bucket a hydraulic dump? I thought those were all trip buckets. I'm guessing one does not need hydraulics for hay rides. :lol:

Blessed Thanksgiving, Chris!

Hey Larry,

No, the one arm bandit is the typical trip bucket. I have checked the fluid, but will re check with better light. I typically run it over full with the loader on, but do have a small leak on the one arm bandit, so maybe I've lost more than I think. If I find it a little low, will the pump staighten out on its' own, or would I want to crack the plug to release any remaining air? The 971 is of course getting a little more frequent use with getting our winter wood up and I want to get the hyds ready for winter, just in case we get significant snow.

Thanks Larry and Wayne and blessed Thanksgiving to all here.

PS - Larry, glad your accident wasn't worse and you got your truck back, looking nice :wink:.

Chris
 
Have you or a PO EVER used silicone in the hydraulic system, e.g., lift cover gasket or, more likely, relief valve cover gasket?

If so, you will find silicone in the hydraulic pump valves.

Though it may take years, silicone will find its way into the hydraulic pump valves, sticking the valves, resulting in "pulsing" before eventual system failure.

You doubt? Try it.

Dean
 
Dean:
I'd never heard or read that about silicone and hydraulic systems before, but that's a really valuable bit of info I'll remember when I tear into mine, Thanks!
 

Low oil situation may work itself out if you find that to be the case. But then again, it doesn't take much to bleed the pump.

Thanks, for the good word on the big rig and the wreck!
 
(quoted from post at 05:34:53 11/22/16) You did check the hyd oil level,didn't you??? And a blessed Thanksgiving to you all!

Hey All,

I believe I was dealing with a combination of low oil level combined with working in some steeper timber. Topped the oil level off and it's been fine since. Now I just need to service the select-o-speed fluid going into winter. It will be nice to blade w/o the one-arm bandit this year :).

Chris
 

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