Terex HD1000 frothing Hyd oil out of the filler breather

[Dinky Diggers]

Hi,
Any idea why hydraulic oil is frothing out of the filler breather on a Terex HD1000 dumper

Thanks
Garry

 

[Monkeybusiness]

Hi,
Any idea why hydraulic oil is frothing out of the filler breather on a Terex HD1000 dumper

Thanks
Garry

It’s probably pulling air in from before the pump - are there any filters etc that have been changed recently or possibly is the oil low and it’s cavitating?

 

[Dinky Diggers]

It’s probably pulling air in from before the pump - are there any filters etc that have been changed recently or possibly is the oil low and it’s cavitating?

Think I've found the problem, the bellhousing holding the main drive pump is fairly damp, so I'm presuming the shaft seal has gone and drawing air.

 

[V8Druid]

It’s probably pulling air in from before the pump - are there any filters etc that have been changed recently or possibly is the oil low and it’s cavitating?

and not correctly replaced/badly sealed/O rings damaged is what MB is getting at .... air getting in somewhere ??