HYMAC 580BT Restoration
Classic Plant & Machinery|October 2017

Having started restoration work on his Hymac 580BT, Jeremy Rowland now looks at the next hurdles to get over as he begins to make progress

I managed to fit the steel hydraulic oil feed hose to the boom hoist rams that had been repaired and for which I had been waiting as I finished my last article on the restoration work, and also fitted the two new flexible hoses to the left-hand hoist ram.

During Andrew Beaulah’s July 2016 working event, Tony Flint attended and, having used the machine, he confirmed my suspicion that the hydraulic pumps had seen better days, although this did not surprise me I knew that the hydraulic pumps were the heart of the machine and they needed to be reconditioned.

Like most Hymac excavators, the 580BT utilises the triple in-line hydraulic gear pump system. There are two makes of hydraulic pumps used on these machines - Commercial Hydraulics and Hamworthy; my digger being fitted with the Commercial pumps. There were two advantages for me inasmuch as Tony Flint could both test and refurbish the pumps and new parts were still available off the shelf for the pumps, so one fine day in August I set about removing the digger’s triple inline hydraulic gear pumps.

Once again I asked for advice from Tony about removing the pumps, which turned out to be an easier job than I had expected. I unscrewed the bolts that secured the three hydraulic pick-up pipes at the rear of the pumps, slackened off the three hoses from the pumps to the oil filters and slackened off the hydraulic filter housing bolts to enable me to disconnect the pipes from the pumps to the filters. That just left the four mounting bolts, which came out without any issues. I did place some wood underneath the pumps to give them some support once the mounting bolts were removed as I did not want to put undue strain on the engine-to pumps drive shaft.

With a web-sling wrapped around the pumps they were ready to be lifted off the digger; these items are heavy and if you don’t have a crane or other lifting tackle available then get help - I was grateful that Tim Brown was there to help me lift the pump assembly off the machine and carry it to the boot of my car.

Once the pumps had been lifted clear of the machine there was a visible sign that all was not well with them inasmuch as the outer support ball bearing was partially collapsed with some of its ball bearings missing.

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