While overhauling the Schaublin 13, some o-rings are to be replaced. The original plans show a cryptic reference for the parts. We found how they relate to o-ring sizes.
The Schaublin manual shows o-ring referencies of type PRP-ddd where ddd stands for a 3 digits number. We realized that this corresponds to the 3 digits o-ring numbered series of standard SAE AS568. This allows us to check again the replaced o-rings for its right dimensions.
In the following table, you will find a summary of o-rings we replaced during the Schaublin 13 (1974 model) overhauling.
| Part | Manual reference | Metric size (mm) |
|---|---|---|
| Feeds gearbox | PRP-010 | 6.07 x 1.78 |
| PRP-016 | 15.6 x 1.78 | |
| Lubrication pump | PRP-110 | 9.19 x 2.62 |
| PRP-023 | 26.7 x 1.78 | |
| PRP-026 | 31.47 x 1.78 | |
| Variator pulley | PRP-219 | 32.92 x 3.53 |
| PRP-121 | 26.64 x 2.62 | |
| Speed change lever | PRP-210 | 18.64 x 3.53 |