Tipping trailer lowering

[DeanB]

Does anyone know how to lower a tipping trailer, it lifts using the tipping pipe connection but wont lower. The only thing I can think of is loosening the pipe fittings to let out some fluid out

 

[JeremyD]

What tractor? Spool valve problem?

 

[DeanB]

Db 995, it's on the tipping pipe connection and the trailer is a single acting ram

 

[AftonShepherd]

If level ground, is driving forward hard and hitting the brakes too obvious / been tried?

 

[DeanB]

After loosening the fittings the ram just bounces and lowers under pressure from me jumping on it.
Must be something wrong with the ram or a sticky one way valve if some like that exists

 

[Frodo2]

At the risk of stating the obvious, if you are working under it make sure the tipped trailer is supported in case the ram does decide to go down fast.

 

[Pennine Ploughing]

if its a male end of a push in coupling on the trailer, then it will not be opening to let oil back, the oil pressure will open it to lift, but will close and stop oil going back to tractor when trying to lower, have a look at it, and swap it with an other and try it again

 

[DeanB]

I've taken all fittings off the ram and if still takes me bouncing on it to lower with fluid oozing out in squirts as it bounces

 

[Pennine Ploughing]

I've taken all fittings off the ram and if still takes me bouncing on it to lower with fluid oozing out in squirts as it bounces

is the trailer top heavy, and when tipped its balanced? and that is why it wont come down ?

pics would help

 

[REStracTORATION]

Tight ram seals? rusty pins?

 

[Lincs Lass]

We used to have a trailer with a four stage single ram ,,tipping was ok ,each section from the bottom went up ok but droping it ,the bottom section went down first then the third section would drop and then it went with a big jolt as the bottom section shot back out over the second ,,we never did discover why it did it ,,more so empty than loaded

 

[milkloss]

Delaminated pipe? Maybe junk in ram acting like some way valve on the outlet.

 

[Exfarmer]

Does anyone know how to lower a tipping trailer, it lifts using the tipping pipe connection but wont lower. The only thing I can think of is loosening the pipe fittings to let out some fluid out

Firstly, are you using the right selectamatic position
to tip trailer , the selactamatic switch ( the one to the left behind the seat ) should be in the TCU tip position
this is done by pulling the main hydraulic lever to the rear and turning the switch. Do NOT force this switch
next to tip the trailer pull the main hydraulic lever hard to the rear.
to lower the trailer push the lever slightly forward, no more than 25% of the travel, and certainly don't push to the bottom.
at the same time lift the quick drop button
if this does not work
change the hydraulic Quick fit fittings on both tractor and trailer. Changing thesse to a dowty fitting ( if still available ) can make a sea change.

however none of this may work , if there is little weight on the trailer.

 

[astra]

When the trailer is fully tipped up AND SUPPORTED spray all the sections of the ram with spray oil wd40 or something like it.work the trailer up and down then and see what happens.maybe put a ton or two in the trailer to make it easier come down a few times...

 

[DeanB]

The rams move freely, it's like theres a one valve holding it all up, I'll try and lift it up with some fixed weight and see if that helps tomorrow

 

[REStracTORATION]

Is there a check valve on the ram
What trailer is it how old?

 

[Baker9]

We had a similar problem on a DB780 years ago, trailer would not go down and the lift arms were the same, turned out it was a small valve on top of the back axel. This was under a the plate the dump valve is fitted to. Take off the plate and there is a large slot head screw. remove this and the valve under it. I think there is a ball bearing there so be careful and not loose it.
This problem is caused by dirt getting into the oil which DBs do not like.
This procedure has been covered on other threads here recently I think.

 

[Exfarmer]

We had a similar problem on a DB780 years ago, trailer would not go down and the lift arms were the same, turned out it was a small valve on top of the back axel. This was under a the plate the dump valve is fitted to. Take off the plate and there is a large slot head screw. remove this and the valve under it. I think there is a ball bearing there so be careful and not loose it.
This problem is caused by dirt getting into the oil which DBs do not like.
This procedure has been covered on other threads here recently I think.

Absolutely correct, I think there is a spring there too. Do NOT lose that ball, it is matched to the valve. The hole in the valve is very fine!

 

[Badshot]

If The trailer isn't dropping with the coupling off on the pipe, it's not the tractor.
Support the body so it can't come down, you'll have to crack the pipe off the ram.
Although I'd say it's the ram

Only way is to push it down with a fore loader or digger, stay clear, when it goes it'll potentially go fast.

 

[DeanB]

I took the pipe off the ram yesterday and it just bounces like it's still under pressure but is does come down with some weight on