[amsat-bb] Re: G5400 Elevation Rotor Opened up

w4upd updwrb at bristor-assoc.com
Sun Dec 6 09:46:39 PST 2009

F.Y.I. The G5400 elevation rotator comes in two flavors depending on its 
age. I ran into this when trying to order parts and my manual showed the 
parts break down for the original version but I had a newer version. The 
early model has a light small motor with a simple felt friction disk and 
a pressed fitted nylon gear. Either the felt needs to be lubricated 
(clutch style) and the nylon gear is cracked (it is pressed fitted on 
the shaft). The motor part number for the old unit is:

    M2190010 is runs about $85.00. If you have the newer unit like I 
have, the motor is larger and has a free spinning nylon gear with a 
notched cam that engages the nylon gear. The motor part number is:  
M2190021 and runs $207.17!!!! needless to say I found my own way to re- 
engineer the nylon gear retainer problem. It is very important to 
determine the correct model of elevation rotator (mine is G500B) as the 
potentiometers, some of the mounting hardware is quite different and 
caused my problems when ordering. If you describe the part, they (Yaesu) 
only look up one model unless you give the actual model you have in 
hand. Good example is that potentiometers are 360 degree versions which 
run $20 each. They'll send you standard 270 degree versions that are 
about $5.00 each unless you state otherwise. They have the parts but you 
have to be clear and sure of what you are ordering from them.

Good luck on your repairs.

Reid, W4UPD

John wrote:
> I opened up the G5400 elevation rotor.
> All the bearings and gears look good.
> Problem found is the motor shaft spins free inside the first, small nylon
> gear on the end of the shaft.
> Any advice on how to replace or repair that gear?
> Thx.
> John KE5GFJ
> _______________________________________________

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