Happy Easter BITOGs,
I'm facing a recurring issue with the drive shaft bushings in a tractor mfwd axle, an ordinary steerable drive axle with outboard planetary hub reductions by Carraro.
The old design used steel bushings with some kind of copper based babbitting. The newer ones are lined with a thick layer looking like sintered bronze (used by many OEMs I guess).
Also, I might be able to "misapply" some teflon lined ones from an other axle.
Which one is "better", what are the pros and cons?
Shall I flip a coin?
Some more details:
- Shaft diameter = 35 and 40 mm
- Speed = From near 0 to 1200 rpm
- Lubrication = Oil immersed nearly 100% of the time.
The real problems, IMO:
- Too many starts and stops, and low average speed, resulting in poor hydrodynamic lubrication.
- "Off axis load", not only when steering, but also because of the clearance in the bushing vs. the opposite shaft end being nearly 100% centered (one in the differential, the other between 3 planetary gears).
Please help me over-think this.
I'm facing a recurring issue with the drive shaft bushings in a tractor mfwd axle, an ordinary steerable drive axle with outboard planetary hub reductions by Carraro.
The old design used steel bushings with some kind of copper based babbitting. The newer ones are lined with a thick layer looking like sintered bronze (used by many OEMs I guess).
Also, I might be able to "misapply" some teflon lined ones from an other axle.
Which one is "better", what are the pros and cons?
Shall I flip a coin?
Some more details:
- Shaft diameter = 35 and 40 mm
- Speed = From near 0 to 1200 rpm
- Lubrication = Oil immersed nearly 100% of the time.
The real problems, IMO:
- Too many starts and stops, and low average speed, resulting in poor hydrodynamic lubrication.
- "Off axis load", not only when steering, but also because of the clearance in the bushing vs. the opposite shaft end being nearly 100% centered (one in the differential, the other between 3 planetary gears).
Please help me over-think this.