Search found 38 matches

by strontium90
Wed Jun 12, 2019 9:12 pm
Forum: Excavators
Topic: Hymac Excavators
Replies: 1103
Views: 135755
Flag: Great Britain

Re: Hymac Excavators

I've seen on another forum that HPS (graham Richie) have stopped stocking HYmac Parts...Is there anyone else?
by strontium90
Sat Jun 08, 2019 2:15 pm
Forum: Excavators
Topic: Hymac 580C slew motor seals
Replies: 12
Views: 2249
Flag: Great Britain

Re: Hymac 580C slew motor seals

The fact that there are two types of motor doesn't surprise me...it was the same with the cross-line relief valve..I may try to do it at some stage but for general clearing as I'm using the machine for at the moment, it's not insurmountable... Just as a side thought....what would be the effect if I ...
by strontium90
Wed May 29, 2019 10:11 am
Forum: Excavators
Topic: Hymac 580C slew motor seals
Replies: 12
Views: 2249
Flag: Great Britain

Re: Hymac 580C slew motor seals

Thanks Fred...I had never even thought of re-torqueing the motor back in...It's a job I will put on the back burner for now...
by strontium90
Tue May 28, 2019 9:29 am
Forum: Excavators
Topic: Hymac 580C slew motor seals
Replies: 12
Views: 2249
Flag: Great Britain

Re: Hymac 580C slew motor seals

Thanks Jeremy...I previously have rebuilt the transmission gearbox and have many years experience servicing old tractors on the farm but I am reluctant to do the slew motor as it might not be so straight-forward. I intend to do the rotary distributor seals when I next get the machine back to the ya...
by strontium90
Tue May 28, 2019 8:36 am
Forum: Excavators
Topic: Hymac 580C slew motor seals
Replies: 12
Views: 2249
Flag: Great Britain

Re: Hymac 580C slew motor seals

Thanks Jeremy...I previously have rebuilt the transmission gearbox and have many years experience servicing old tractors on the farm but I am reluctant to do the slew motor as it might not be so straight-forward. I intend to do the rotary distributor seals when I next get the machine back to the yar...
by strontium90
Mon May 27, 2019 4:42 pm
Forum: Excavators
Topic: Hymac 580C slew motor seals
Replies: 12
Views: 2249
Flag: Great Britain

Hymac 580C slew motor seals

Hi...as I've previously posted, my Hymac is very sloppy on the slew..she tends to creep to the right, when I am on a hill although turning to the left is ok and she holds ok.. I've changed check line valves and checked the cross-line relief valve, bled the suction tank and keep her topped up with hy...
by strontium90
Fri Mar 08, 2019 2:01 pm
Forum: Excavators
Topic: Hymac 580BT 1969
Replies: 122
Views: 34797
Flag: Great Britain

Re: Hymac 580BT 1969

Hi Jeremy...I see you are getting on well with your Hymac...she is looking good. I see you are intending to rebuild the bucket ram...Mine was leaking pretty badly too, so in the end, I replaced the seals about 18 months ago. It is a more difficult job than you can imagine due to the weight and size ...
by strontium90
Thu Mar 07, 2019 11:09 am
Forum: Excavators
Topic: Wiring problem on Hymac 580 C
Replies: 6
Views: 1382
Flag: Great Britain

Re: Wiring problem on Hymac 580 C

It has taken me a while to get round to this, but as I am recovering from an operation, I.ve had some time to get on with it...I will update how I have progressed. I did as Fred suggested and found that the white wires were the live, in the control panel, and that they feed fuse two (2nd from left) ...
by strontium90
Sat Jan 26, 2019 1:19 pm
Forum: Excavators
Topic: Hymac 580 C Cross-Line Relief Valve Adjustment
Replies: 14
Views: 3934
Flag: Great Britain

Re: Hymac 580 C Cross-Line Relief Valve Adjustment

Thanks a lot Fred...I have tested her this morning although on level ground and the slew function is much improved....she stops where I want her to which makes digging a lot easier :D I have left the check valves to close when the slew is operating so I'm reasonably sure that is how they should be.....
by strontium90
Fri Jan 25, 2019 6:34 pm
Forum: Excavators
Topic: Hymac 580 C Cross-Line Relief Valve Adjustment
Replies: 14
Views: 3934
Flag: Great Britain

Re: Hymac 580 C Cross-Line Relief Valve Adjustment

Ok...removed the check valves and found one had came apart inside...there is a small cross of metal that holds the spring which holds a ball bearing and the spring and cross (Y shaped) are held in with a circlip.. I got another one from our local breaker but I noticed it was installed the opposite w...

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