This procedure will guide you in re-assembling the HEQ5 Right Ascension axis and follows on from the stripping down and cleaning guide HERE.

NOTE: Very little of the mount assembly requires brute force on tightening down components. They need to be firm but not so tight the threads pop.
Generally a light touch is required rather than brute force. Remember this is a precision piece of engineering and many of the fittings are aluminium so threads
can be easily stripped and ruined.

NOTE 2: When this guide was originally written the accepted wisdom was that white lithium grease was an overall good lubricant. However it would appear that
standard white lithium grease may cause problems under some extremes of damp/temperature. All of the mounts I have rebuilt have been done with white
lithium that is stable and often mixed with a synthetic like Teflon or PTFE. It is best to consult the manufacturer on the quality of the product.

Lubricate Small Roller BearingsLubricate the small roller bearings and replace them
on the worm, then replace the worm in its carrier.
Note: the worm has a longer spindle one end than
the other. The longer end goes to the motor gear.

Replace Float AdjusterReplace the float adjuster and tighten down. The
adjuster should be just tight enough to stop the
worm moving from left to right in the carrier but not
over tightened. If its too loose there will be 'play'
in the mount, if too tight the mount may 'bind'.

Assembled Worm CarrierHere is the assembled worm carrier. Its been
cleaned and loose flaky paint removed.
You can see the worm now has a thin coat of lithium
grease.
Note: The motor gear can be reattached now or
left until later.The motor gear must have one of its
set screws on the flat portion of the worm spindle.

Roller Bearings ReplacementReplace the roller bearings into the brass worm
gear - apply a small amount of grease to the edges.
These may have to be tapped into place
using a nylon hammer or a block of wood.
Apply lubrication to the brass gears.

Replace Brass GearPlace the brass gear back onto the RA shaft and
place the washer back to the top. Note the brass
gear has a layer of lubrication on its gears and on
the bearing face.

Replace Worm CarrierReplace the assembled worm carrier and replace
cap headed screws but only just tight enough to
hold the worm carrier in place.

Remount Alt-Azimuth BAseRemount the Alt-Az base of the mount to the RA
axis - make sure the roller bearings faces are
given a smear of lithium grease.

Replace Tapered BearingReplace the tapered bearing after making sure it is
clean and has been well greased with the lithium
grease.

Replace Slotted NutReplace the round slotted nut and tighten. This
needs to be not much more than hand tight.
Make sure that it is compressing the tapered
bearing into place.
Check slack in the RA axis and if it binds too
much then slightly then loosen this nut.

Tighten Locking ScrewsTighten down the locking screws located in the slots
of the round nut.

Replace Right Ascension ScaleReplace the Right Ascension scale and set-screw.

Replace Polar Scope BaseplateReplace the polarscope base plate. Don't over-
tighten.

Tighten Small Set ScrewsTighten down the small set screws in the polar-
scope mounting plate.

Replace RA Brass ButtonReplace the RA brass button and lock nut and and
make sure its has been lubricated with lithium
grease.

Replace RA Locking LeverReplace the RA locking lever and make sure it is
free to lock and release the axis.

Replace Polarscope.Replace the polarscope.

Replace RA Lever ScrewReplace RA Lever Screw

Replace Plastic CoverReplace the plastic motor cover.

6 Philips Screws ReplacementReplace the 6 Phillips screws in the motor cover.

Replace Polarscope CoverReplace the polarscope cover.
The polarscope will require recalibrating.
See my polar alignment guide HERE

• Strip Down and Cleaning of the Declination Axis
• Lubrication and Reassembly of the Declination Axis
• Strip Down and Cleaning of the Right Ascension Axis
• Adjusting Worm Gear Engagement – Motor Gears
• Adjusting the Altitude Thrust Bearings
• Appendix – Hardware and Software History