Hydraulic Pump

I assume the system was fully drained/flushed and a new set of filters were fitted before firing up the new (second) pump?

Initially from what you have said, my take on it would be, if the oil has gone at depth, then you may have little oil left in your water system! If the thrusters are nosiy and you are bursting motors then it’s likely that you still have water AND air in it. Although it’s a bit late now…

1. Investigate faulty pump for any evidence (as mentioned in earlier posts) of foreign objects, water ingress etc BEFORE fitting a new pump

2. Drain, flush, circulate oil through system to remove any of the above. Actuate valves, thrusters, anything that uses the hydraulic circuit. Drain and flush again.

3. Inspect/sample the oil

4. Check clearences and that end thrust/float on the motor shaft is within tolerance…(I doubt that this would instigate the fault), but worth doing as you have (had) it in pieces

5. Check rotation of the electric motor and RPM. Although again, I would be suprised if this was the precursor to the fault, a possibility tho’

THEN and ONLY then, when you have satisfied yourself that the rest of the system is NOT the cause would I even entertain putting on a new pump, (after initially filling it on the bench with oil and checking rotation is free etc).

💡 It’s a system of logical thought processes (through understanding the basics) to rule out (what usually are the cause) the obvious. 💡

Written by a sparkie, so I may have missed a few points 😆

Pay Peanuts….need I say more ❓

Sounds to me like they know what they are doing and don’t need experienced pilot/Techs on the job as it costs their company more money l
Shame really 8)
I wish them all the best 😯

well boys im neither, im an aircraft tech, and as i tell all my new boys, nuts and bolts are just nuts and bolts no matter what system they in.

so

you mate have given me hope, cos if thats the standard of technical diagnosis used in this industry them im in with a chance, you trash 3 hyd pumps on an aircraft and still not fix the snag, you’ll be unemployed even before you went and orderd the forth.

however you have got the last laugh, cos you are an rov pilot/tech and im just a newbee/wannabee with little hope of getting a job cos , you get what you pay for …peanuts anyone

AL 🙄

No one is judging the skill level here but these guys are making it extremely hard work for themselves on several accounts.

1. They haven’t even given a decent technical description of the problem so how can they expect a decent technical reply? (language issues aside as well).

2. Any decent tech would/should be able to fault find the problem through logical progression which doesn’t appear to have happened but its hard to tell due to lack of technical input about the problem.ie. What was the depth when the fault occurred? What is the working pressure/ What was it when the fault occurred?What was the state of the oil, had the spare pumps been set up pressure wise, checked and had docs to say so etc, etc……..list is long.

Most people hate to ask others for help especially on an open forum like this unless it is absolutely necessary and its a last resort. This seems like they couldnt be bothered to even try…might not be true but feels like it.
Im not always pessimistic just realistic……. 😀 😀 😀

Saeed Do you guys have the manual for it? If not I have one I can email to you….

I hope you had better luck with the 4th pump…No one like to see people struggling!

Have you had any luck Saeed?

Straying slightly…

I take the OP at face value, and what it says to me is pretty obvious…cheap labour and no experience.

This is the ‘response-ability’ of the office wallers/ops managers/Project managers that are cutting costs left, right and centre to win contratcs, and something has to suffer…the quality of the workforce.

We are all doomed anyway…it’s the 10/10/10 😯 No dives today 😆

A10V series pumps suffer failures from a couple of easily remediated causes sometimes:

1. Case drain not being fully air bled before initial startup

2. Compensation pressure too high (over 7.5 psi)

3. Initial DFR settings too high would also be a consideration, although I don’t believe catastrophic failure just because of this would be common

4. Run thrusters as you start up the pump for the first time to flush air more rapidly and take the load off the pump – may be more fiction than truth, but I always do it because that’s what I was taught

5. Of course this has been covered in great detail already, but foreign objects/clogged filters are also common culprits

Hope this helps.

Hello guys,

im newbie in this world..can i ask you all if the return line have a leak.is it can be the pump failure?

thanks for helping..