Tipper probs.

[treequip]

I've just replaced the tipper mech on my truck and it goes up fine but goes down dangerously fast especially when loaded, it always did it before I replaced the motor etc, is it missing a valve or something?

 

When you send it down the oil is supposed to go back to tank trough a small hole controlling the speed of flow and thus decent

 

Sounds like its missing the flow restriction. It depends on the make but its usually in the aluminium housing under the solenoid switch. (its the bit with 2 small wires)

 

Send some pictures

 

Keep your bits safe if you do anything with it:thumbup1:

[High Scale]

Thanks, I'm thinking it must be in the ram itself as the new motor/tank fitting has not solved the problem, i'll get some pictures when I get back.

[High Scale]

Pictures of replacment tipper stuff and ram, I had to turn the oil reservior around to get it to mount correctly:001_smile:

[treequip]

OK first things first ,before doing anything to this secure the body before working on it getting squashed by a tipper body is likely to result in serious sense of humour failure

 

Is the system "bled up", air moves quicker than oil which can give the symptoms you describe particularly on a single acting ram. send the body up and see if you can bounce it, if its full of oil (uncompressible) it wont move, if its got air in it, it will be "squishy" and probably goes up a bit jerky

 

In pic 3 the round thing with the battery lead is the solenoid power for the pump. The black rectangular thing is the solenoid for the down, the restriction usually lives between that and the tank so that it only works on the "back to tank" side and not the "up" side

[High Scale]

I think the problem in in the ram as its an old problem not solved by replacing the motor and pump.

[treequip]

I think the problem in in the ram as its an old problem not solved by replacing the motor and pump.

 

I think the problem is in the ram, its air in the ram.

 

There isn't much to go wrong in the ram itself, its a rod and a seal inside a tube, there might just be a check valve in case a hose bursts but its hard to see how that could cause the symptoms you described

[Daniël Bos]

When the tipper is all the way up, does the motor change sound instantly or does it do so gradually?

When lifting, does the back start moving straight away or does it take a few seconds to move?

 

If there's air, the air will need squishing to whatever pressure is needed to lift the load before the back will start to tip, this will take time.

If there's air, the pressure relief will likely not be triggered as soon as the ram is fully extended but will continue to squish the air until the relief pressure is reached.

 

Easy checks to do.

[High Scale]

Well I had a poke about tonight, but lets answer some questions, bed goes up with a tiny hesitation, there is no bounce in the bed when its up, when it comes down you can here a slight hiss like a baby snake, is that air?

[High Scale]

Bed has always come down at a rapid pace, changed the motor and pump and its the same.

 

Conclusion - the problem is the ram unless I got the only motor and pump with the same problem in the whole of the West Country.

[aspenarb]

It cant be the ram Mr Scale, its only a single action. Fluid goes in the same port as it exits, if it was duff all your fluid would be on the floor. Its either air in the system or body mods such as high sides or lockers have increased the weight which in turn will increase the speed of descent. If its the latter it can be controlled with a restrictor in the dump ports of the pump unit.

 

Bob