FORUM CLASSIFIEDS DIFFLOCK.com Links & Networks
Forum Homepage
Log in
Profile
Search
Private Messages
Forum Members
Register
Classified Ads
Search Ads
Place New Ad
My ads
Place your classified
ads here for FREE
NB: Adverts placed in the general
forum areas will be deleted
Difflock Homepage
Online Shop
Contact Us
FAQ
Calendar
Garage
Facebook
Twitter
Youtube
Advertise With Us - Reach your target market by advertising on the Difflock.com forum.
Click here or call 0845 125 9407


hydraulic problems on a U1000

 
 
Post new topic   Reply to topic    Difflock Forum Index -> Mercedes & Unimog
View previous topic :: View next topic  
Author Message
agrimog
Winch Assistant


Joined: 02 Mar 2010
Odometer: 65
Location: in the middle of some forest in sw scotlandlaughing at al the stuck lr's



PostPosted: Mon Apr 19, 2010 11:02 pm    Post subject: hydraulic problems on a U1000 Reply with quote

I have a "small" problem with my mog hydraulics, in that I'm not getting the full200bar, I'm only getting around 100bar, the two options I've got are, either someones screwed around with the relief valve on the spool valve block, or the pumps on the way out. with a test gauge on the connections, I get 100bar from fast idle to max rpm, I think this tends to throw me towards the pressure relief vave rather than the pump anyone out there got any ideasor comments on this. I really need the 200bar for my log splitter to split the big stuff, and work the winch.
cheers
Paul

__________________________________
when in doudt,gie it a clout,bigger the doubt,bigger the clout
Back to top
View user's profile Send private message
normalbloke
Articulating


Joined: 29 Aug 2007
Odometer: 633




PostPosted: Tue Apr 20, 2010 6:55 am    Post subject: Reply with quote

Pressure relief valve on the spool block is my money.I believe you can remove it and clean it but it rarely fails due to contamination.I assume your oil and filter is in good nick?
Let me know how you get on.
Back to top
View user's profile Send private message
Turnip
Just got MTs


Joined: 29 Oct 2007
Odometer: 192
Location: Gloucestershire



PostPosted: Tue Apr 20, 2010 5:31 pm    Post subject: Reply with quote

I know when I had a worn pump on mine - the pressure curve was linear and dependant on speed. The wear in the pump is very noticable as "slip" at low revs but less so as you speed up. I reckon it will be PRV or suction line?
__________________________________
Never mistake the edge of your rut for the horizon.........
Back to top
View user's profile Send private message
teamidris
Mud Obsessed


Joined: 24 Feb 2008
Odometer: 3372
Location: Staffordshire UK



PostPosted: Sat Apr 24, 2010 7:05 pm    Post subject: Reply with quote

My moneys on relief valve.
Suction problems normally make the hydraulics juddery as gas bubbles form and make the oil spongy. Normally you can still get full pressure but not flow.
And everything else (leaks internal) have pressure dependant on speed. But there should still be some pressure change with speed, but maybe only 100 or 200 PSI.
Might have bust the relief valve spring. Rare, but does happen (generalisation, as never tinkered with mog, but hydraulics is hydraulics Smile ).

But more likely its been wound down on pressure to protect something that was connected previously?

__________________________________
https://m.youtube.com/channel/UC3l3zoaCabKrgBSULSV1YgA
Back to top
View user's profile Send private message Visit poster's website
agrimog
Winch Assistant


Joined: 02 Mar 2010
Odometer: 65
Location: in the middle of some forest in sw scotlandlaughing at al the stuck lr's



PostPosted: Sun Apr 25, 2010 4:10 pm    Post subject: Reply with quote

well guys, after all the signs showing it to be the prv, it was the pump, wear inside wasnt letting it build the pressure, new pump fitted, and alls well, even the crane works faster now. next problem on the fixit list now, find and fix the air leak in the trailer air system (nightmare !!!!). thanks for your help and opinions guys
big paul

__________________________________
when in doudt,gie it a clout,bigger the doubt,bigger the clout
Back to top
View user's profile Send private message
teamidris
Mud Obsessed


Joined: 24 Feb 2008
Odometer: 3372
Location: Staffordshire UK



PostPosted: Fri Apr 30, 2010 6:03 pm    Post subject: Reply with quote

WOW, wasn't expecting that from the pressures Shocked Glad he's fixed Very Happy
__________________________________
https://m.youtube.com/channel/UC3l3zoaCabKrgBSULSV1YgA
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    Difflock Forum Index -> Mercedes & Unimog All times are GMT - 12 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can post calendar events in this forum
Oil Safe

Facebook

Evo Oils

Specialist Tools

Adrian Flux 2023

Join our mailing list for upcoming events, special offers, discount coupons and expert advice on the latest 4x4 products!

* indicates required





    
Powered by phpBB © phpBB Group