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  #1  
Old 02-13-2014, 03:43 PM
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SLS High Pressure hose. 1984 300TD

I have been having issues with noise from the SLS and decided to rule out pump cavitation by replacing the high pressure hose and check the plastic pieces and see if maybe there was maybe an obstruction.

Well..... the PO had it changed at some point , because the hose has newer white writing on it (more than likely by someone who has no knowledge of the system), and they must have pitched the old hose with all the plastic anti cavitation pieces in it and installed a new one with nothing in it!!

I ran a coat hanger through the old hose and it is empty.

Does anyone have any suggestions on where I might get all of those plastic pieces together so I can get it to work right?

Thanks
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1980 300TD, SOLD
1984 300TD, 275K
1999 C230 K Black & Tan
2013 C250 Black
You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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  #2  
Old 02-13-2014, 05:08 PM
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MB doesn't sell the plastic parts separately.

Anybody have a used high pressure hydraulic hose assembly that they want to part with?
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1980 300TD, SOLD
1984 300TD, 275K
1999 C230 K Black & Tan
2013 C250 Black
You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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  #3  
Old 02-13-2014, 05:16 PM
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Good luck on that. My recollection is that they resembled irrigation pop up head filter inserts?? Perhaps some of those might work.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #4  
Old 02-13-2014, 05:53 PM
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Good luck on what? Finding a used hose assembly? Don't tell me that, are they really that hard to find?

My biggest problem is that I have never seen a wagon at my local junk yards in more than a decade!! Ugh

I'll check into the filters, but I'm thinking they are too big. Maybe not, worth a shot.
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1980 300TD, SOLD
1984 300TD, 275K
1999 C230 K Black & Tan
2013 C250 Black
You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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  #5  
Old 02-13-2014, 07:51 PM
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do you have a hydraulic hose supply place near you? they might be able to get you what you need.
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  #6  
Old 02-13-2014, 08:22 PM
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I do to get the hose, which was the plan, but when I opened it up there was no plastic inserts that keep the pump from cavitating. I'm assuming it has to do with back pressure on the pump. I'm not an expert, I could be wrong.

Do all hydraulic systems use these types of inserts, plugs, I'm not sure what they are called?
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1980 300TD, SOLD
1984 300TD, 275K
1999 C230 K Black & Tan
2013 C250 Black
You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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  #7  
Old 02-13-2014, 09:29 PM
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I don't think so. I think other members have hoses without the inserts and aren't experiencing problems.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #8  
Old 02-13-2014, 10:00 PM
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Quote:
Originally Posted by firstdiesel View Post
MB doesn't sell the plastic parts separately.

Anybody have a used high pressure hydraulic hose assembly that they want to part with?
I do...

sitting on my shelf.... along with the entire sls assembly if you need it... two in fact... one is still in the car, an 85 euro td...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #9  
Old 02-13-2014, 10:21 PM
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Thx Kerry. Here's the thing, I've got a buzzing noise that changes exactly with my RPMs. I know there could be many other things that cause this, but I've narrowed it down.

With the car running, I can put my hands on the metal tubing that runs along the passenger side under the car and feel the vibration. If I go in the back, the noise is clearly coming from right where the hydro shocks are and the metal tubing that runs under there. I can hear it in the car and under the car. It actually changes pitch when going over bumps at speed when the suspension is compressed and released.

I bought a rebuild kit for the pump that seals everything that can be sealed, o-ringed or gasketed (made up word). I re-sealed the valve in the back, twice. I replaced both hydro shocks and all the rubber on the rear subframe, mounts (3) , trans mount and motor mounts. I've traced the exhaust to see if its touching anything, I've traced the SLS lines to make sure that the rubber bushings aren't disintegrating and touching and I've run out of things to look for.

I spoke with someone I know that is extremely knowledgeable about my plight and he said that it sounds like a cavitation problem, which leads me full circle to why I took it apart in the first place.

Maybe it is the shape of the old hose? I could just get a new hose and see if it changes. It could also just be a burn pump due to running dry before I bought the car, but it does level the car fine and I didn't notice anything when I had it open and pushed the pistons to see if they moved freely.

The suspension works properly when driving, not bumpy, and it fills properly. Just that buzzing/vibration noise all the time.

I am way open to suggestion, but when I previously posted this nobody really had the problem so they couldn't help.

Sorry for the short story turned long, but the plastic pieces were just the next step. I would love for someone to step up and tell me how they fixed this without replacing a $1000 pump.

Thanks to all that have pitched in on suggestions already.

Todd
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1980 300TD, SOLD
1984 300TD, 275K
1999 C230 K Black & Tan
2013 C250 Black
You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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  #10  
Old 02-13-2014, 10:23 PM
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JOHN!! Read my previous post. Tell me your thoughts!
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1980 300TD, SOLD
1984 300TD, 275K
1999 C230 K Black & Tan
2013 C250 Black
You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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  #11  
Old 02-13-2014, 10:29 PM
vstech's Avatar
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yup. cavitation from the lack of restriction in the tubing... there are several styles. I think I have the orificed tubing... I may also have the string of balls. I'll check if you need them...
any chance you'd throw that $1000 my way?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #12  
Old 02-13-2014, 10:42 PM
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Well you saved the day, if I had it to give, you'd be at the top of the list!! But alas I do not, sorry.

Thank you for the help, this has been driving me insane hearing it all the time I'm in the car!
__________________
1980 300TD, SOLD
1984 300TD, 275K
1999 C230 K Black & Tan
2013 C250 Black
You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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  #13  
Old 02-14-2014, 11:31 AM
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i have a solution that may be helpful to you, however my post was deleted because it is against forum rules as it mentions another parts vendor. i am aware of a rebuild kit available for the high pressure hose for the SLS. you can pm me for more info.
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  #14  
Old 02-14-2014, 12:36 PM
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This may help

Self Leveling Suspension = SLS hydro pneumatic



.
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  #15  
Old 02-14-2014, 03:28 PM
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Quote:
Originally Posted by unity View Post
i have a solution that may be helpful to you, however my post was deleted because it is against forum rules as it mentions another parts vendor. i am aware of a rebuild kit available for the high pressure hose for the SLS. you can pm me for more info.
What is in the rebuild kit? All you need is a new piece of hose to rebuild it. The fittings are reusable.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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