Hymac 580BT 1969

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Jeremy Rowland
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Re: Hymac 580BT 1969

Post #161 by Jeremy Rowland » Fri Aug 21, 2020 12:00 am

While the Poclain was drying in the sun I decided to tackle a job that has needed doing for a while now on the Hymac, one of the two steel pipes which feeds the left hand track drive motor had sprung a leak, I had already noticed that it had been hastily brazed up at some time in the past, however I have asked for a new pipe to be made up as once it was removed I found that it had been crushed at some point in the machines life. These pipes are not in the easiest of places to access and I ended up with my right arm soaking in hydraulic oil.

Some of the other flexi-hoses don't look too clever either so I can see more work ahead here in the future but I wanted to focus on getting the steel pipe replaced first.

The main issue is that the hydraulic oil drains down through the system once you remove this pipe, fortunately I have a bung of that thread so I was able to seal the connector where the pipe fastens onto, I also had to bung up the track drive motor or the oil would also leak through that, looking forward to a nice new pipe to fit back onto the machine.

Jeremy



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Re: Hymac 580BT 1969

Post #162 by Jeremy Rowland » Fri Sep 04, 2020 1:44 pm

Having said that I wanted to concentrate on the Poclain, when I arrived up there yesterday the weather was initially too wet to start any painting so I decided to press on with some more work on the Hymac. The four feed hoses to the rotary coupling were starting to look rather rough and as I had a set ready to hand I decided to fit them.
This is not the easiest of jobs they are a bit of a pig to say the least but while the machine was still propped up on a bit of wood, this meant that the angle of the digger would help to prevent the loss of hydraulic oil, which on the older Hymac machines would run through and empty the system. After doing this I also removed another rough hose which I have to get made up and measured two others which when made I will fit them all at the same time, this made more sense as the oil was now drained from the rotary coupling.

Jeremy


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Re: Hymac 580BT 1969

Post #163 by Jeremy Rowland » Fri Sep 18, 2020 2:29 pm

With me being temporarily unable to spray paint the Poclain I decided to try and get the Hymac back together as she has been in pieces for the last few weeks now; the flexi-hoses that I had ordered arrived in the week and the steel track drive motor pipe had also been repaired so I set about sorting it out.
I changed the three flexi-hoses first then fitted the repaired steel pipe, this work is not easy as you are on your back under the machine or peering down between the two boom hoist rams to get to the rotary distributor, by the end of the day the job was done although I have not had time to top up the hydraulic oil or even run her up to check for leaks but at least she is together again.

Jeremy


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Re: Hymac 580BT 1969

Post #164 by v1230nm » Fri Sep 18, 2020 8:40 pm

Always good to read how your restoration projects are going. Interesting reading and good clear photos.

Neil. (v1230nm)


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Re: Hymac 580BT 1969

Post #165 by Jeremy Rowland » Sat Sep 19, 2020 10:31 pm

v1230nm wrote:Always good to read how your restoration projects are going. Interesting reading and good clear photos.

Neil. (v1230nm)



Thanks Neil :thumbup: I have enjoyed the work I do on these machines and am slowly but surely getting there; it was five years ago to the day that I purchased this Hymac, you can see the progress by just looking at the photos of what she looked like when I bought her.

She is a fairly straight machine but the undercarriage does need some TLC so I will hopefully look at that in due time, like any large job I just do it a bit at a time.

Jeremy


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Re: Hymac 580BT 1969

Post #166 by essexpete » Sat Sep 19, 2020 11:08 pm

Well done Jeremy. Do you stay oop there over the weekend?


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Re: Hymac 580BT 1969

Post #167 by Jeremy Rowland » Sun Sep 20, 2020 2:43 pm

essexpete wrote:Well done Jeremy. Do you stay oop there over the weekend?



No Peter, the only time I stay up there is usually on a working event as there is a lot of work to do getting the machines ready for action and other work to help get the event setup, so my working time in general is one day a week at best so I make the best of that one day and try and get as much good work done as possible, I like to go back home feeling happy that I have accomplished some of the restoration tasks from off the 'to do list' in my mind.

Jeremy


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