Hydraulic filter collapse

[V8Druid]

can't see as your filter is being collapsed by demand ?
you'd empty the tank and be getting pump cavitation if that were the case
more likely your bypass is faulty and not allowing excess pressure to bypass .. do you have the right return filter installed - correctly???
bypass should only come into play if the return route through the filter is blocked
what's the filter look like - is it in the right way up? assume this is a return installation in the top of the tank with a bypass port built into it?
also assume it's a pressurised tank system?

 

[CPS]

Breather blocked?

 

[Vinpetrol]

 

[Vinpetrol]

Number 19 is the valve. It must be supposed to push up against the spring and allow the oil to flow through the top centre of the filter and out the bottom . It can't be working but I'd expect the oil flow to be all going through the filter and not needing the bypass with a brand new filter anyway so that may be faulty but something else must bewrong as well

 

[Vinpetrol]

EDIT: Suggestions below assumed it was the suction filter

What oil are you running in the hydraulics?
If the oil is too heavy (say 46 when 32 is called for), then the flow resistance will be a lot higher than expected.
That said, a hard vacuum is -14.7psi. The only way you can exceed that pressure on the filter is if the hydraulic tank is becoming pressurised.
Is it possible the breather is blocked? (tbh, I would have thought the tank would burst before the filter collapsed).

View attachment 81193

Rethink - The only reason the return filter will collapse is it has too much pressure around it (fairly obvious).
The filter is protected by a bypass valve that should limit the pressure to 0.9 Bar (13psi) (at modest flow rate).
The two likely causes are:
- The bypass valve is blocked/restricted
- The flow rate is much higher than expected.

It's running 46 as per spec
what can increase the flow rate ?

 

[Vinpetrol]

Breather blocked?

It was replaced Aiden

 

[Mick-the-fitter]

The spring is there fore bypass pressure when the filter is blocked but I agree with oil grade or thickness of it as in dirt content.

 

[Vinpetrol]

can't see as your filter is being collapsed by demand ?
you'd empty the tank and be getting pump cavitation if that were the case
more likely your bypass is faulty and not allowing excess pressure to bypass .. do you have the right return filter installed - correctly???
bypass should only come into play if the return route through the filter is blocked
what's the filter look like - is it in the right way up? assume this is a return installation in the top of the tank with a bypass port built into it?
also assume it's a pressurised tank system?

It is the correct filter. I've had 2 aftermarket and 1 OEM .

 

[Vinpetrol]

I’ve just found out I have the bypass valve in upside down I have a new filter to try so I will drain the oil , clean the strainer , change the filter , top it up and with oil and put back together and see what happens

 

[V8Druid]

I’ve just found out I have the bypass valve in upside down I have a new filter to try so I will drain the oil , clean the strainer , change the filter , top it up and with oil and put back together and see what happens

er.......... should be good to go ... you've been pressurising the bypass the wrong way .... very annoying for you Vin

 

[Vinpetrol]

Well I got the tank cleaned out . It only had a wee bit of card in the bottom from the collapsed filters strainer was pretty clean but gave it a wash while I was in about it . I fitted new filter and the valve the correct way up
then topped it up with fresh oil . Just got it completed this eve and fired it up . Levers aren’t stiff feeling and the machine seems pretty good , just a wee bit off vibration in levers but I’m assuming that’ll be air in system. I will work that out of it in the morning.
My only concern now is why is the bypass valve working at all ? Do you think I have an underlying problem ?
Will need to give it a good work out

 

[DaveDCB]

Wonder if it’s been wrong way around since new???

 

[Vinpetrol]

Wonder if it’s been wrong way around since new???

I doubt it Dave . A few years back I had a final drive collapse and pump damage . I was in about the tank cleaning it all out . I was a bit OCD about cleaning it and I changed the oil 3 times . I must of done it at some point when putting it back together and then repeated the fault every time I was back in the tank .

 

[DaveDCB]

Well hope it’s all good now, just shows how one small part can upset a whole machine!

 

[Gecko]

Poor design if it can go in both ways

 

[Vinpetrol]

Poor design if it can go in both ways

Definitley , that’s what I thought . It has a lip that fits in the filter perfectly upside down and then a lip on the other side that the spring fits perfectly into .

 

[Bri963]

Poor design if it can go in both ways

In one fortnight I had a driver and a technician fit secondary air filter elements in back to front, one in a 249 CTL, the other in a cp44 roller.

 

[Vinpetrol]

In one fortnight I had a driver and a technician fit secondary air filter elements in back to front, one in a 249 CTL, the other in a cp44 roller.

Thanks Brian , I don’t feel such an eejit now !

 

[Furniss]

i bought a used 806 that boom ram lifted really slow and dropped like a pipe had burst, was a valve upside down iirc

 

[Vinpetrol]

I fitted a new hoist ram (which I had spare ) today as one was weeping and serviced it , changed final drive oils and then gave it a wee work out after and the ram seems fine and more importantly the filter is still in one piece .
It will get a good work out at the weekend to see if it is all good but it certainly is going in the right direction . I have one wee issue now that has been on it for years but I’d like to sort it if at all possible but it won’t be the end of the world if I can’t .
The auto idle will only work manually . It won’t work on auto . It works manually if I press the button on top of the lever but not on auto.
I checked the diagnostics on the machine and it is set to cut in after 9 seconds . When auto is selected it highlights in the dash that it is on.
I will post a pic from the electrical layout for it see if anyone has any ideas