Strip Down and Cleaning of the Right Ascension Axis

EQ6 strip down guide header

Synta EQ6 / Orion Atlas – Stripping & Cleaning the Right Ascension (RA Axis)
This procedure will guide you in stripping down and cleaning the EQ6 / Atlas Right Ascension axis. Re-assembly of the RA axis is covered HERE.

To carry out this procedure you will need a good assortment of tools including cross head and Phillips screwdrivers, a rubber or nylon mallet, a soft toothbrush,
degreasing agent, metric Allen keys, long nosed pliers, lots of lint free cloths and lithium grease.
I found commercial degreasing agents somewhat ineffective and resorted to using good old hot soapy water. Lithium grease is easily available from shops
selling bicycles. It’s also advised to have a large soft towel or similar to lay the mount on while working on it to protect its external finish.

I would strongly advise you do not attempt this procedure without reading it through a few times in advance to understand the process. The procedure takes
around 4 hours from top to bottom (but read the observations at the bottom of this page) unless you are very confident of what you are doing and have exactly
the right tools.
Its definitely best to have someone around to help you with some elements of it – remember take your time and when in doubt STOP and THINK.
Take a break when tired because you don’t want to bodge anything.

The DEC and RA worm gear adjustment process required after re-assembly can be quite lengthy as its very much trial and error so bear this in mind before
starting and allow plenty of time to carry out the procedure – it will pay dividends in terms of smooth and precise running and longevity of the mount.

Stage 1 – Stripping the RA Axis
Stage 2 – Stripping the Worm Carrier
Stage 3 – Cleaning & Lubrication

Ready for Cleaning and LubricationWith a clean lint free cloth wipe all of the oil from the components. On this mount the roller bearings
were sealed and appeared to be well lubricated so were left alone. The tapered bearing had almost no
lubrication and so was cleaned and relubricated with lithium grease.

To lubricate bearings put a blob of grease onto the palm of your hand and press the bearing into it and
then rotate the bearings around forcing the grease into the inside of the bearing.

The brass worm gears and steel worm along with the carrier should all be cleaned in a degreasing agent. I personally find really hot water and a basic detergent works best. These were cleaned with a soft toothbrush and the rinsed and left to dry. All of the gears showed either little lubrication and/or engineering swarf present.

The picture to the left shows all of the components from the RA axis removed, cleaned and lubricated.

The RA element of the mount was very hard work to disassemble. The primary problems were removing the main RA nut behind the polar scope I tried some band grips, mole grips etc. and none of them worked. The bolt should have been protected with a cloth but it was impossible to remove with a cloth on it due to the tools slipping. In the end the bolt was removed with an oil filter wrench which marked the finish. This was touched up during reassembly with some good quality enamel paint. Further problems were encountered removing the RA main bearings from the RA spindle. Due to some corrosion and lack of lubrication these were virtually seized onto the shaft and it took over 2 hours work to gently tap and drift them loose. As with the DEC axis the bearings, although well lubricated behind their dust shields were almost dry in contact with the mount. The main RA casting bearing was jammed to the RA spindle on removal rather than staying seated in the block. The RA spindle showed signs of rough machining and this was rubbed down using fine emery cloth and wet and dry paper. The brass RA worm gear also showed signs of damage on its lower face. This was carefully ground out. Although it had no impact on running it looked unsightly. The RA showed little over-painting problem or debris but there was some corrosion along the main RA spindle along with a chalky type of deposit which may have been corrosion or scale of some kind. This was polished off with some very fine emery cloth and wet and dry paper. Unlike the DEC axis the RA worm interface was clean on the worm carrier but the whole top of the RA block was painted. It was felt better, as the paint was sound, to leave this alone.