unloader surging

[cpcleaning]

I tried routing unloader back to tank,but when I started machine up the flow actuated unloader started surging in and out.

 

[Don Phelps]

Is the unloader a K-7? Mine was doing the same thing and we corrected it by changing the size of the orifice to the bypass line. What size hose is your bypass line?

 

[cpcleaning]

No, this is a delco RK-43,It came with the K-1 unloader.I think the unloader hose is 3/8".

 

[Don Phelps]

OK, whether it's a K-1, K-7 or K-10, it's a flow-actuated unloader. Sometimes a larger bypass hose will cure the problem, other times the orifice needs to be reduced to a smaller one.

 

[Russ Johnson]

Here's a link to the parts breakdown, proper setting procedure, and troubleshooting tips for your unloader.

K 1 Unloader Spec Sheet

 

[Mathew Johnson]

To quickly trouble shoot this is what I did... MIne was surging... I put a hose clamp around the unloader hose and slowly tightened it up... It stopped surging after a few twist on the clamp... I ran the machine like that until the smaller unloader orifice came in.\


Matt

 

[Hotwaterwizard]

The Bypass orifice is the most common cause and so is too small of a tip size.