Jump to content

Log in or register to remove this advert

Recommended Posts

Jensen 530 vari-track, checked the hydraulic oil level (when very cold) and topped up yesterday morning (couldn't see it in the glass which seems "normal" when cold) but it seeps oil from the stop-bar plunger (looking at this on monday), so topped up anyway to mid-way between min and max. turned machine on and after a few minutes on a fast idle it chucked out a bit of oil from the breather and after showed to be more than full in the viewing glass.

used the machine for about 2 hours yesterday.

Today, on warm up (been out all night again in -15c it done the same, but this time chucking out foaming oil, quite a bit, then settled down and worked fine

Why does it do this? is the level in the viewing glass for warm oil? 

 

@Mike Hill, @PeteB?

 

 

Link to comment
Share on other sites

Log in or register to remove this advert

Two things mate.

 

1) you hdo is english stuff not designed to be viscous at low temps. Drain and change.

 

2) overfilling will cause it to foam up too. The filler lid on mine is a breather and as the oil is forced through it when overfilled it foams.

 

I take it you have acceptable function on the rollers and you just filled the oil level to the bottom of the sight glass?

  • Like 2
Link to comment
Share on other sites

Cheers for the quick replies!

 

It is still on the uk hyd oil, never any problem with roller or track function, or last winter, a little slow when cold but normally let the machine warm up before going full revs/chipping. 

 

Fillers the breather on this one too, just never noticed the excess oil foaming, even in the filler neck before.

 

I filled up to midway in the sight glass, but it seems to chuck oil out if theres any oil visible in the sight glass. 

 

What was "abnormal" was not that it chucked out oil after potentially over filling, thats fine, but that it done it again today in the morning without topping up, even after chipping for 2 hours yesterday, id thought the oil level had sorted itself out yesterday morning!

 

I'll change oil and see if i can find a filter on Monday. tracks in for changing the oil?

Link to comment
Share on other sites

Are you chipping with the flow valve wide open or have you slowed down the rollers?

 

The filter is in the grey housing on the back of the cutting disc housing on mine,the relief valve is on I think the left had side close to the filter housing.Its Brass coloured and has a knurled knob on the top of it.

 

You can disconnect the return line to the pump and idle the machine untill no more oil comes out,I cant remember if there is a drain on the oil tank?

 

 

Link to comment
Share on other sites

Foaming or frothy oil could be 'cavitation', air is being mixed with the oil as to it is circulated. Usually from a faulty pump (as Gary says) or a loose hose fitting. Is the oil a milky colour on rest? Does it clear after a long rest? It isn't turning to a mayonnaise with water and oil mixed together?

  • Like 1
Link to comment
Share on other sites

5 hours ago, Gary Prentice said:

our forst chucked a load of oil out this week due to a combination of a severely dirty filter and drawing air in at the pump - due to worn seals around the pulley shaft.

Did you replace the outrigger bearing with the pump? Belt tension correct?

 

Oil seals are effective in one direction not the other so in cold weather it pays to warm up the machine gently to prevent a depression at the inlet port which pulls air past the seal. Once air is in the system it cannot settle out and hence overflows the breather. Because of the way the side pieces of a gear pumps are pressure compensated often the damage is done as they get forced sideways onto the gears.

 

Cavitation is a separate phenomena, also worse as oil thickens, where the depression behind the gears causes a vacuum bubble which then collapses,this can erode the metal. The first grapple loaders I saw had pressurised tanks to try and prevent cavitation, perhaps that was because they came from Sweden.

 

Both result in loss of power.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  •  

  • Featured Adverts

About

Arbtalk.co.uk is a hub for the arboriculture industry in the UK.  
If you're just starting out and you need business, equipment, tech or training support you're in the right place.  If you've done it, made it, got a van load of oily t-shirts and have decided to give something back by sharing your knowledge or wisdom,  then you're welcome too.
If you would like to contribute to making this industry more effective and safe then welcome.
Just like a living tree, it'll always be a work in progress.
Please have a look around, sign up, share and contribute the best you have.

See you inside.

The Arbtalk Team

Follow us

Articles

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.