Hitachi EX75UR-5

[Locofitter]

Indeed, the idler carrier protrudes approx 20mm from the frame. Is this an acceptable wear limit and will adding a bit of tension to this track cause damage to the idler/track tension ram?

With regards to Vesconite, I'm rather confident that it'll work. Haven't seen any bad reviews on it, see the link below for more information. I need to try and find bore/pin etc dimensions first.

http://www.oemoffhighway.com/product...vanced-polymer


As I am by no means an experienced operator, it would be nice to be able to get on a machine for a while to advance my operating competence. However, it seems the old blokes just shag the thing whilst me and a couple others end up repairing it.
Watching them use a grading bucket to dig rather solid ground and move lumps of hardcore was quite frustrating, given the bucket is a bit bent/twisted. Wouldn't mind but the ripping bucket was 50ft away!

Use the wrong tool for the job and you risk damaging your machine, seen it so many times in my field with other applications. Sad really.

[Nobody]

Vesconite is quite a new material and is used in many heavy engineering parts, diesel marine engines for a start (vastly bigger on load bearing than a 8t excavator). I would be happy to try this and feed back in a number of months as it does seem to be a very good option. Many people throw it out from the word go because they see it as plastic replacing their long loved metal bushes, which is fine. Many don't like change.
The machine isnt in daily operation, we mainly use it for lineside work. Have thought about disconnecting the high speed tracking foot switch but if I'm totally honest - its mainly used by a few old blokes who are so painfully slow to watch when in the seat, I doubt they ever use it. Nosebleeds if they go too fast

I would very much like to see feedback on vesconite bushes if your set for doing that! Could get intresting

Had me laughing about them old blokes have a couple of em too.. One falls asleep while operating at times! Just continues the movement where he fell asleep when wakened like nothing happened

[v8druid]

Hi,

I will take a photo of the idler wheel when I am back there on Tuesday, the yoke pokes out roughly 20mm from the surround that it sits in, have 4 and a bit fingers slack on this track, dubious to adjust it as not sure how far the idler is safe to travel and wouldn't want to bend the track tensioning piston rod.

Vesconite is quite a new material and is used in many heavy engineering parts, diesel marine engines for a start (vastly bigger on load bearing than a 8t excavator). I would be happy to try this and feed back in a number of months as it does seem to be a very good option. Many people throw it out from the word go because they see it as plastic replacing their long loved metal bushes, which is fine. Many don't like change.
The machine isnt in daily operation, we mainly use it for lineside work. Have thought about disconnecting the high speed tracking foot switch but if I'm totally honest - its mainly used by a few old blokes who are so painfully slow to watch when in the seat, I doubt they ever use it. Nosebleeds if they go too fast

Slew makes no obvious noises, and has a little bit of play (maybe half inch) in the Z axis plane.

On the plus side, a manual has been sourced! All 1000+ pages which need to be taken out of many files and all put into searchable .PDF :/

Now then .... "many a good tune played on an old fiddle" ... wise heads etc. !! ......."why run down , when we can stroll and **** 'em all" ...... if you don't know the joke ... PM me

1/2" play in the slew (ring)?? can you elaborate on that one?

Good news on the manual front at least and assume you mean that the idler carrier is presumably protruding 20mm from the frame ??

You must be up to the post count for pix by now mate

As for the vesconite ....... will be very interesting to see how it works out .... I'll try anything that works ... well

[Locofitter]

Hi,

I will take a photo of the idler wheel when I am back there on Tuesday, the yoke pokes out roughly 20mm from the surround that it sits in, have 4 and a bit fingers slack on this track, dubious to adjust it as not sure how far the idler is safe to travel and wouldn't want to bend the track tensioning piston rod.

Vesconite is quite a new material and is used in many heavy engineering parts, diesel marine engines for a start (vastly bigger on load bearing than a 8t excavator). I would be happy to try this and feed back in a number of months as it does seem to be a very good option. Many people throw it out from the word go because they see it as plastic replacing their long loved metal bushes, which is fine. Many don't like change.
The machine isnt in daily operation, we mainly use it for lineside work. Have thought about disconnecting the high speed tracking foot switch but if I'm totally honest - its mainly used by a few old blokes who are so painfully slow to watch when in the seat, I doubt they ever use it. Nosebleeds if they go too fast

Slew makes no obvious noises, and has a little bit of play (maybe half inch) in the Z axis plane.

On the plus side, a manual has been sourced! All 1000+ pages which need to be taken out of many files and all put into searchable .PDF :/

[v8druid]

Could you supply a pic of the idling wheel so we can see how far out it is? Dont forget that you need a good amount of slack to get the track back on, so removing a link might be a bit drastic..
The track is also supposed to hang a little.. Rule of thumb is two fingers between tracks and most centered track roller


Worst part about em is hinder of sight for me.. the much extended reach is very nice tho.

ain't gonna take a lot of tension to lose a few fingers sag then

[Nobody]

I misread the king post, was on the phone whilst reading the reply. We have a similar thing in my industry called king post which does a similar job thus was getting confused.
I thought it read 'connects the undercarriage to the upperstructure'.

Looking for information with regards to the track and bush issues. Is there a work around for the tracks and has anyone had any experience of making their own bushes or bushes made from Vesconite?

Ta

Could you supply a pic of the idling wheel so we can see how far out it is? Dont forget that you need a good amount of slack to get the track back on, so removing a link might be a bit drastic..
The track is also supposed to hang a little.. Rule of thumb is two fingers between tracks and most centered track roller

The principle is OK ..... just few people make 'em man enough to take any serious shit .... or at least the level to which I'd trust 'em to stick the pace and not wear out rapidly

Worst part about em is hinder of sight for me.. the much extended reach is very nice tho.

[v8druid]

........, king post is crap

The principle is OK ..... just few people make 'em man enough to take any serious shit .... or at least the level to which I'd trust 'em to stick the pace and not wear out rapidly

[v8druid]

I misread the king post, was on the phone whilst reading the reply. We have a similar thing in my industry called king post which does a similar job thus was getting confused.
I thought it read 'connects the undercarriage to the upperstructure'.

Looking for information with regards to the track and bush issues. Is there a work around for the tracks and has anyone had any experience of making their own bushes or bushes made from Vesconite?

Ta

Just been having a read on the Vesconite front ..... can't see it liking the forces exerted upon it by a digger's loadings? .... I'd either be turning up some EN10 bushes and having them induction hardened with soft (untreated) pins or the reverse, but the bushes'd be cheaper to get hardened

or

buy some stock Phosphor bronze thick wall tube and turn some bushes from that ..... I really don't think that your Vesconite is going to stick the pace



As for the track chains .... the tension doesn't sound hugely out, but I don't know a huge amount about them. The bushes and pins are obviously worn, probably internally and externally, thus increasing your effective pitch length .... but, at the same time, as the sprockets wear, their pitch centres will reduce, as the bushes wear deeper into the sprockets.

you say the sprockets aren't too bad ..... therefore the pitch of the chains can't be too bad either, so removing a link to get the tensioner and idler back into the sliders isn't going to be too drastic an action ..... when you reach the point that new chains are going to be needed, you'll replace the sprockets as a matter of course anyway ...... so nowt to lose really and tensioner improvements to be gained

Just how much tracking is this machine going to do? I'd also disconnect/disable the hi-speed tracking ........ kills tracks ... rapid

you could always get a quote to have them re-pinned and bushed too but depends on how worn the chain links are really

I have read somewhere that it's relatively normal to remove one link during the life of a chain, but if you get to the satge of having to repeat the process ..... they're probably well banjaxed by that point anyway.



AS for the slew 'slop' ..... measured at the end of an extended dipper, i'd say it's in fair condition .... there is bound to be wear at the pinion/ring gear interface ..... does it make any nasty noises?
pinion/ring gear fit is never solid / lacking any backlash/movement .... I'd be more concerned about checking slew ring lift ...... having a carbody/superstructure drop off'd be embarrassing
and don't over-grease the ring .... having grease oozing out of the seal is not good ..... grit and shit gets in by the same route, if the seal is bulging away from the mate face

[Locofitter]

I misread the king post, was on the phone whilst reading the reply. We have a similar thing in my industry called king post which does a similar job thus was getting confused.
I thought it read 'connects the undercarriage to the upperstructure'.

Looking for information with regards to the track and bush issues. Is there a work around for the tracks and has anyone had any experience of making their own bushes or bushes made from Vesconite?

Ta

[v8druid]

I don't fully understand it either and its not what I was getting across.

What is this king post? Does anyone have any expertise to offer on the aforementioned problems, please?

Thought so. A planetary gear set on ours.

All of the presented issues.

I've yet to see one of these I'd trust, other than as previously mentioned Loco




What's the planetary set reference to Boyo ???

If you're talking 'bout all the worn pins etc., I've already said that you'll need to see if you can get away with simply replacing bushes and pins if the bosses aren't affected..... but'll possibly need to strip it down to see perhaps?

Gonna have to go back and have a re-read for the rest

[Locofitter]

Thought so. A planetary gear set on ours.

All of the presented issues.

[Muz]

What is this king post?

The bit that holds the boom onto a digger with offset

Does anyone have any expertise to offer on the aforementioned problems, please?

which one ?

[Locofitter]

I don't fully understand it either and its not what I was getting across.

What is this king post? Does anyone have any expertise to offer on the aforementioned problems, please?

[Nobody]

What is this about changing the pitch if taking out a link, i dont get it??

Also, king post is crap

[v8druid]

Agree with that



Whats put you off so much ? .. having operated both , using a dozer blade and king post offset gives you a much bigger arc than a boom offset ever will .. bit of a pain to prop up your machine on the dozer if you had to do it, but it works ?

I've yet to see a king post that looks man enough for the job Muz, with the exception perhaps of the Hydrema's king posts on the 800 to 1200 series m/c.s ..... 'kin solid

They all always look too fragile to me, but agree with you that they give you a much greater reach ..... as long as you don't break 'em

I've op.-ed plenty of king posted stuff and it's real handy, in a tight spot