DREDGE COMBO HAS NO SUCTION - ANY IDEAS ?

[Buckshotnc]

I have a 2 1/2 inch combo dredge/hibanker and every line is clear but there is no suction at the dredge nozzle, I can use as a high banker but a small amount of water come out the nozzle but if switched to dredge there is no suction. Any thoughts on what my problem is ? Any help or thoughts appreciated.

 

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[Buckshotnc]

Have used before with no problem and pump is primed and all hoses seem clear as well as nozzle.

 

[russau]

A picture of your dredge setup and suction line would tell it all ! Sounds like you have NOT kept your venturi under water ! your NOT picking up your suction from your nozzle if your venturi is NOT under water ! And while your at it , check to see that your suction line doesn't have a rock stuck in it .

 

[Reed Lukens]

Small roots plugged the impellar.

 

[xracer550]

some times rocks/roots get into the pump & will reduce the output

 

[russau]

all said............... BUT check it out for yourself to see if the venturi wasn't COMPLETELY UNDER WATER. otherwise it won't suck water ! believe me on this ! to me this is your most probable source of no suction .

 

[Buckshotnc]

Thanks for your ideas, will check out next time out with it.

 

[N-Lionberger]

Another thing to consider is how high your highbanker is above the water.

 

[ZombieKnot]

Got a screen on intake? Are the holes reduced in size from clay? Did you ding the venturi and its not aimed into outlet?

 

[Darth Placer]

Check the orifice (where the pressure enters the main dredge hose). I had a rock in mine once and took me some time to figure out. The rock got in there when taking the dredge down for the day. Just shine a flashlight down in there. If its a curved pressure tube run wire or weedeater line in there to make sure there isn't any unseen obstruction.

 

[russau]

Buckshotnc have you had a chance to get your rig out to check it out yet ??

 

[Buckshotnc]

Buckshotnc have you had a chance to get your rig out to check it out yet ??

Yes, actually hooked a stronger water pump to It and it worked a little better but not strong enough to move any size rocks just mostly sand. Still a mystery and I’ve had another Dredger look at it and he couldn’t figure it out. All lines appear to be clear. But thanks for all the helpful ideas.

 

[Reed Lukens]

Sounds like we need a pic of it set up. 4 horse motor or more?

 

[HeavyMetalThunder]

One scenario (15 yrs. working oil & gas fields) that I've seen a few times, was interior ply delamination with multi ply hoses...once fluid starts moving through the hose it gets into the delamination void, then balloons/ swells the very interior ply inwards causing a restriction or even a complete blockage...then with no flow of fluid the ply's natural memory makes it resume its wall shape and will look like a normal good hose.

 

[HeavyMetalThunder]

On the off chance there is Interior delamination of a multi ply hose, there's a chance the delamination could be directional...

If so, then there's a chance that end for ending the hose (making the hose flow opposite of it's current flow direction) just might mitigate the ballooning... and hence a better flow rate might/should show...