big tex dump trailer problem

[jiminpa]

I got a 2 year old big tex dump trailer, model 70sr, that started to puke hydraulic fluid when coming down. it also will not stay up when you release the button, it slowly comes back down. dealer has been worthless, says its out of warranty and not his problem.

 

[Code54]

Have you checked all the connections and made sure everything is tight. Where are you losing the fluid from (Cylinder, hose, fitting, pump, etc) That will help someone help you.
I would also consider calling the manufacture, sometime they are good at helping with problems such as this. Nothing to lose but a few minutes in the phone.
Good luck

 

[ruffdog]

It looks like it is a power up/down pump? Does it puke fluid during gravity down and/or power down? Where is it puking fluid from....reservoir vent? Is the fluid clear or foamy looking?

Big Tex Trailers 7SR Tandem Axle Single Ram Dump Trailer

 

[bigtiller]

You've got my attention Jim. I also have a 2 yr old Big Tex 70sr dump trailer.
I hope the fix is something simple.
I'm watching.

 

[jiminpa]

power down..comes out of the reservoir.dumps about half of it out.

 

[4570Man]

Is it clean looking oil or is it milky or foamy?

 

[ruffdog]

Is it clean looking oil or is it milky or foamy?

That is what I was wondering....it's not like it can get "extra" oil from somewhere else. If something is causing it to foam up with a bunch of air, then it will overwhelm the reservoir.

I know sometimes a snowplow pump/cylinders can be a pain to bleed the air.

 

[ruffdog]

I forgot one cause of air getting into the system,,,a plugged pump inlet:

https://www.tractorbynet.com/forums/hydraulics/160413-dump-trailer-hydraulic-problem.html

 

[RollTideRam]

My Big Tex trailer did this one time, but has not done it since. Maybe it had too much hydraulic fluid in it.

 

[lennyzx11]

My Big Tex trailer did this one time, but has not done it since. Maybe it had too much hydraulic fluid in it.

That was my initial thought. But it would be hard to have too much fluid unless someone filled it with the piston extended.

 

[TheFarmerInAdell]

Is the motor running on the down stroke? I've had a battery go dead on the way up to the point it wouldn't power down so I let gravity do it's thing and then it puked out the vent. If the motor isn't running you're not transferring fluid from one side of the cylinder to the other if it's a double acting cylinder. You create a vacuum in the rod end while emptying the fluid out of the cap end. The only thing that throws me off is the fact that it creeps down when up. That sounds like a bad valve not sealing off.

 

[nikerret]

I had the solenoid go bad. It would stop the motor from running when lowering, which allowed the bed to lower too quickly. Without the motor regulating the speed, the fluid shot out. It did this a few times before I got the problem sorted. The manufacturer of the pump, KTI, sent me a replacement solenoid. It was easy to replace.

Is your motor running the entire time it’s lowering, if it’s a power down?

 

[GreatWhitehunter]

This is likely being caused from the solenoid not opening. On the way down the oil gets diverted to the other side of the cylinder. When it has nowhere to go it overflows the sump.
Same thing that would happen on a power down with a dead battery. Take a DVM and test the coil resistance, if that's ok check all the wiring.

Matt