Seastar hydrolic steering testing

[Chuck4741444]

I'm having problems after I hit the motor putting extreme pressure on. I lost my steering.
Things done i have bleedit to death many times.
I have removed it an totally disassembled it twice, every thing was oily and spotless clean, removed the 4 springs and ball bearing twice. Secondtime I pulled the side caps.

Today I'm test the pump the only way I know. I have installed a 3 way valve with a gauge and plug. When I turn it I can feel each internal cylinder clicking as it turns, im getting to 75 psi per click. It pegs my gauge at 300 pluse. Each way.
Is the pump bad?

 

[dingbat]

I'm having problems after I hit the motor putting extreme pressure on. I lost my steering.
Things done i have bleedit to death many times.
I have removed it an totally disassembled it twice, every thing was oily and spotless clean, removed the 4 springs and ball bearing twice. Secondtime I pulled the side caps.

Have never seen a "dirty" hydraulic system. It's always a stuck/sticky valve of some sort or seal blow-by

Seals in a hydraulic system are not reusable. If you pulled the caps, the seals need replaced

Today I'm test the pump the only way I know. I have installed a 3 way valve with a gauge and plug. When I turn it I can feel each internal cylinder clicking as it turns, im getting to 75 psi per click. It pegs my gauge at 300 pluse. Each way.
Is the pump bad?

What have you done to resolve the lose of the check valve in your earlier post?

Why do you think the pump is bad?
You should be able to move a motor (swivel in good condition) with very little pressure. 300 PSI should be more than enough.

Is the pump sized for the cylinder displacement?

 

[Chuck4741444]

Have never seen a "dirty" hydraulic system. It's always a stuck/sticky valve of some sort or seal blow-by

Seals in a hydraulic system are not reusable. If you pulled the caps, the seals need replaced

What have you done to resolve the lose of the check valve in your earlier post?

Why do you think the pump is bad?
You should be able to move a motor (swivel in good condition) with very little pressure. 300 PSI should be more than enough.

Is the pump sized for the cylinder displacement?

I found the problem, the polymer seal on the plunger is letting fluid through. I stopped testing pressure at 300. That's all my gauge read, I could get more press.
I have found a company that sells the rod with the plunger and seal together. For about 125.00
I couldn't find the o-ring and the polymer seal. Sold separately online.

 

[Chuck4741444]

Have never seen a "dirty" hydraulic system. It's always a stuck/sticky valve of some sort or seal blow-by

Seals in a hydraulic system are not reusable. If you pulled the caps, the seals need replaced

What have you done to resolve the lose of the check valve in your earlier post?

Why do you think the pump is bad?
You should be able to move a motor (swivel in good condition) with very little pressure. 300 PSI should be more than enough.

Is the pump sized for the cylinder displacement?

I tested the pump with the lines disconnected using a 1/4 valve and gauge on each hose, i could see it moving pressure from one line to the other...
It's a bad plunger... thank for responding.

 

[dingbat]

I found the problem, the polymer seal on the plunger is letting fluid through. I stopped testing pressure at 300. That's all my gauge read, I could get more press.
I have found a company that sells the rod with the plunger and seal together. For about 125.00
I couldn't find the o-ring and the polymer seal. Sold separately online.

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