[TR] J-Type Overdrive oddity

[David Porter]

I'll defer to Randall, since he seems to know. I will say I recall when 
the Factory sent a team of engineers to this Country and our shop (one 
day) to determine why so many gear boxes were failing.. They 
consequently discontinued the use of gear oil in the boxes. problem 
fixed. Just saying Randall.
Dave
On 11/8/2014 9:13 AM, Randall wrote:
>> The J has a relief valve which is "sensing" this condition and not
>> engaging until the pressure drops.
> Doesn't work that way.  The "relief" valve regulates the pressure by relieving any excess back to the sump.  It is normally slightly
> open all the time and only varies how much to keep the desired pressure; either around 20 psi when idle or 550 psi when operating.
>
>> You may have used 80-90
>> gear oil in
>> the gear box as well, exacerbating the problem .
> Just to be clear about this, 90 weight GL5 gear oil is the factory-recommended fill for temperatures above -10C.  For temperatures
> below +10C they allow 80W GL5 gear oil.  So 80W90 should be perfect in all temperatures (since the 80W rating is for 0C and the 90
> part is for 100C).
>
>> I'd drain  both units
>> and replace with 30wt non detergent
> Which would actually be thicker at the same temperature than 80W gear oil; plus not have the additives to protect the gear faces.
>
> Randall
>
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-- 
Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM 
87107 505-352-1378 Go HERE: my world www.porterbikes.com/