Adjusting cub 154 hydraulic pressure

T

toehead

Well-known member
Gents, I am wondering where the relief valve is located on the 154?

I need to lower the max pressure. I was driving around with my new power steering and I turned too quickly and hit the stop. Hitting the stop like that blew out one of the internal seals on the steering valve.

I looked up the specs on the tractor the valve comes from, and it runs at 1000 PSI. I think the 1500 psi from the 154 were too much.

Tips welcome.
 
The manual indicates that serial 018709 and below are non-adjustable in the specifications section. Not sure if yours is below or above this serial number.
For those above the serial number, the circuit relief valve is built into the control valve. Pressure is adjusted by adding or removing shims which adds or removes spring tension. See page 9-8 in the manual referenced above.
 
Clearly, we need a full thread about your power steering unit project. I saw the youtube video of it working, but was thinking this was an electric unit rather than hydraulic. I'm just guessing that your bucket has its own hydraulic pump?
I'd hate to reduce the pressure in that hydraulic system if something else uses it (like a 3-point hitch). If another system also uses this, maybe use a hydraulic pressure reducing valve at the entrance of the power steering unit.
 
Thanks for the replies!

I have been doing digging. The valve I have is rated for 1800 PSI, so should be OK with the stock hydraulics. (The power steering is currently plumbed into the main hydraulics, which works the 3 point hitch. I pulled the lift cylinder off and capped it since this thing is a dedicated loader)

I have come to the conclusion that this is my fault :) I misread the hydraulic diagram. The valve that I am using has an "AUX" port that allows downstream devices to operate while making sure that steering remains the priority. I looked at the diagram and thought that regulating the pressure on the AUX port would also ensure no pressure spikes on the IN port since most of the time they are connected. However, I forgot that they are NOT connected when turning. The end result is that I deadheaded the pump while turning and the steering valve decided to MAKE a pressure relief valve :lol: What an oily mess.

I'll need an inline relief valve in front of the steering valve to keep this from happening again.

Live and learn!
 
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