Here is a drawing of the Ross gear box.

2. is the front oil seal.

4. are the roughly 45 MM inside diameter prop gyro load needle bearings. 
These are part of the reason the Ross gear box is so light weight.
The other reason is the prop shaft is made from thick wall relatively large
diameter chrome molly seamless tubing. A good feature of the Ross.

5. is the race for the large diameter needle bearing that takes all the prop
thrust loads.

6. is the the large diameter needle bearing that takes the prop
thrust loads. This bearing to my knowledge has never given problems.
Part of the reason for this is it is running only about 2700 RPM
unlike the Mazda 13B thrust bearing running at 6000 or so RPM.

7. is the Ford C6 ring gear.

8. is the Ford C6 planet carrier.

9. is the modified Ford C6 sun gear.

10. is the oil seal that leaks if you allow too much
oil pressure in the box. IMHO the box needs a vent at the top
that is vented back to the oil sump on the 13B besides the
normal drain back tube. BTW this drain back tube should
be be about 1/2 inch inside diameter. Some people scrimp on this
drain back tube diameter and I think that is part of the reason
some people have problems. 

Paul Lamar
 
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