I did my 12-years-old HEQ5 maintenance following Martin's Youtube videos (that are really excellent, actually) last Sunday and yesterday I tested it on the field.
DEC is backlash free and the guidance is excellent while I have some issues on the RA axis.
Once I finished the maintenance on Sunday, with the RA clutch closed, I was feeling a kind of backlash on the RA axis: when moving up and down the counterweight bar, actually the RA axis was doing small movements. Like swings.
So the first idea was to tighten and loosen respectively the top and bottom little screws as much as allowed.
I did it but this sort of backlash unluckily didn't go completely away. The RA axis is still able to swing if touching the counterweight bar, with the clutch closed.
Anyway, with this configuration I tried some guiding yesterday night and:
- DEC excellent (0 backlash)
- RA with big hops, even visible by simply looking at the PHD2 video streaming. The RA seemed to be pretty much swinging
At first glance I thought that this terrible RA behaviour root cause was its residual movements mentioned above but I am really not so sure about that anymore.
So I started convincing myself of the other way round: the small swinging I can feel on the RA axis (with the clutch tightened) is not a real issue while having closened too much the worm and the crown gear could be the cause of these jumps. I undid it this morning: loosened the upper little screw and tightened the lower one and I am planning to retest ASAP.
In the meanwhile, if anyone might have some tips for this situation, it would be great!
[EDIT]: Just a note: it's not just a matter of bad guidance along the RA axis. I could see yesterday night oscillations/swings in the RA direction simply looking at the PHD2 streaming. The frequency is pretty much high (seconds) but not regular.
Thanks so much in advance.
Edited by rob77, 28 July 2021 - 11:19 AM.