Terex hr18 problem

[welshfarmer]

Hello my grandad owns a terex hr18 and is using it to tidy his smallholding and it has developed a problem. When he runs it for an hour the hydraulics begin to slow down but if he puts the dipper out the hydraulics work again for a small amount of time but the oil heats up and it stops again. Does anyone know what is wrong with it?
Thanks

 

[V8Druid]

blocked filters? in need of an oil change? blocked pick up strainer, but'd expect it to improve as the oil warms/thins .. worn pumps

 

[welshfarmer]

Pumps have been reconditioned and it has had filters and oils changed

 

[doobin]

What do you mean, ‘puts the dipper out’? Surely you are using the dipper anyhow as part of normal use?

Do you mean stick it out fully, dead end the circuit?

 

[CPS]

Is it hard to start? Is the hammer petal stuck on ever so slightly? This would cos similar symptoms

 

[welshfarmer]

What do you mean, ‘puts the dipper out’? Surely you are using the dipper anyhow as part of normal use?

Do you mean stick it out fully, dead end the circuit?

Yes

 

[welshfarmer]

Is it hard to start? Is the hammer petal stuck on ever so slightly? This would cos similar symptoms

Isn't equipped with a hammer

 

[CPS]

Isn't equipped with a hammer

But does it have a hammer line/extra petal on the floor

 

[Mick-the-fitter]

Restriction going back to tank, hydraulic oil cooler blocked, tank breather blocked!

 

[welshfarmer]

But does it have a hammer line/extra petal on the floor

Yes

 

[welshfarmer]

It tracks for 20 minutes then it dies down but when he sticks the dipper out it works like normal for another 10 minutes and it does this until it dies. The oil is heating up in that time. It has had a full service and new pumps. Anyone have any idea?

 

[doobin]

How does it 'die down'? Dead stall? Deffo sounds like a major restriction somewhere.

 

[welshfarmer]

Doesn't cut out just slows down to the point of it not working right

 

[welshfarmer]

It's 2005 if it helps

 

[V8Druid]

try a.n.other new return filter ........ you never know? .... if it cures it do a post mortem on what comes off

 

[Mick-the-fitter]

Ok so it sounds like the returning oil can’t get back to tank! Simply when tracking and it slows the returning oil has a blockage or restriction when returning to the tank, by using the dipper it allows a percentage of the oil into the larger half of the cylinder so less oil needs to go back to tank!

 

[Mick-the-fitter]

Pumps have been reconditioned and it has had filters and oils changed

Was this All done because of the problem or the problem has arisen since?

 

[welshfarmer]

Was this All done because of the problem or the problem has arisen since?

Done because of the problem

 

[welshfarmer]

Ok so it sounds like the returning oil can’t get back to tank! Simply when tracking and it slows the returning oil has a blockage or restriction when returning to the tank, by using the dipper it allows a percentage of the oil into the larger half of the cylinder so less oil needs to go back to tank!

How can he fix it

 

[Furniss]

How can he fix it

I think he's trying to get to the point of being able to tell you.