Hi Tim,
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Following are the part numbers I have given out to folks in the past, but I have not checked the links in quite a while. There are the Losmandy stock parts (not sure why you can't get them) and others from McMaster and Amazon. I have switched to the heavier duty versions on my mounts which hold more grease and have caged bearings. Personally, I like using the replacement thrust washers mentioned over the stock part as they seem to have a higher hardness and should wear less.? I would also recommend replacing the worm bearings if you are going this far and which are also mentioned. You need the same set of parts for both the RA and Dec drives.
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Here are the upper thrust bearings:
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and one thrust washer:
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You need a one 1/16” or 0.06” thick washer (3 in. ID) and one 1/32” or 0.03” washer for the washer/bearing/washer stack to be the correct height for worm to ring gear alignment.
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And here is the thinner one:
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Some guys like this alternate bearing with caged needles instead:
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Losmandy sells the whole group as a set:
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but you should not need the inner donut which rarely goes bad. Smaller needle type bearings included here.
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3? ?? 5905K29??? ??? Needle-Roller Bearing, Open, for 1-1/4" Shaft Diameter
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1??? 94065K32??? Belleville Disc Springs for Ball Bearing Trade No. R4, 0.406" ID, Packs of 10
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2?????? SR4-ZZC #7 PS2?? BG (.250X.625X.196)
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Then there are the lower thrust bearings and washers as well (1.25” ID).
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or these alternates:
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with upper and lower washers both 1/32”, you need two.
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A lot of mounts came from the factory with Jet-Lube MP-50 applied to the upper thrust bearings and washers, and more importantly the ring to worm contact. The Jet-Lube Artic grease was applied elsewhere. Please let me know if you want some MP-50 as it is expensive and only comes in larger containers. I can send a small tin at cost with enough for a rebuild if you are in the USA.
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Please get back if you have any questions.
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Good luck,
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John
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Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, NINA, Sequence Generator Pro and PixInsight user
