hydraulic pump stops

[gsgaditano]

Hello, I have a problem with the system, the pump stops when it reaches pressure.

I changed the pump and the circuit breaker assembly. When it reaches pressure, it doesn't spin and the belt makes a rubbing noise. I checked the pressure tube that runs from the pump to the circuit breaker. I don't know what else it could be. Could it be the safety valve? The central ball? Thanks.

[David]

Firstly, does your car have power assisted steering?

By circuit breaker, do you mean you’ve replaced the pressure regulator? (The thing on the front of the engine with a sphere on it.)

My first guess would be if you’ve had the pressure regulator (&/ or flow divider valve) off the car, then there’s probably 2 pipes that have gone back in the wrong place. They’ll just need identifying & swapping over.

Secondly, if you’ve replaced the pressure regulator, have you put the correct one on the car? There are 2 types; one for vehicles with PAS & one without. This one should be obvious though because you’d end up with either unused unions or extra pipes if you tried fitting the wrong one.

Hope that helps.

[gsgaditano]

Hi, the car doesn't have power steering, it's a 16 TGs. The GTI I also have does have power steering, which is why they added the additional piece that distributes the LHM.

I replaced the accumulator-circuit breaker. I also tried another ball that was working. The tubes can't be interchanged because they're of different thicknesses. The tube that comes from the pump is wider than the one that comes out of the pump that goes to the safety valve, the one that distributes to the correcting forces, brakes, and suspension. That's all I have to check... that that valve isn't clogged or that the tube that comes out of the circuit breaker to the valve isn't clogged... I'm also thinking about a misplaced return. The mechanic they took the poor BX to was pretty bad, and I've already seen two return tube joints... instead of replacing the entire tube

[David]

That does sound strange. If the car doesn’t have power steering, then there is less to go wrong and the problem should be easier to find.

It won’t be the security valve, it has no way of locking the pump up, whatever the problem is, it’s before the security valve.

Is the return hose from the pressure regulator to the LHM tank free of obstructions? When the system reaches pressure, the regulator should ‘tick’, & the oil should flow from the pump back to the tank instead of the security valve.

Maybe you could post a picture of the pressure regulator on here & show, or label, where each pipe goes. It would be easier for us to see it.

Is it possible that the pipe for the pump is in the return hole of the regulator? If the pipes are backwards, it could cause strange symptoms.

I assume it will be, but is the hydraulic pump belt tight enough? It’s better to rule out the obvious.

If all the pipes are definitely in the right place, and there are no blockages or kinks in the pipes, then most likely the problem is a faulty pressure regulator.

The sphere wouldn’t cause the pump to lock up. If it’s faulty, then the regulator would ‘tick’ very quickly (every 5 seconds roughly), whereas it’ll ‘tick’ slowly if it’s working correctly, (could be anywhere from 40 seconds up to 2 minutes if it’s a really good system).

I’d check to make sure there are no blockages & ensure the pipes are 100% in the correct places before going any further.

Hope that helps.