## 3 Results
### Lubricant Condition Analysis After the First Hour of Gear Module Run-In  
In the second phase of the experiment, an analysis was performed on samples taken from individual gear modules (G1 to G4) after one hour of operation during the initial run-in on the test rigs. The elemental contamination analysis of the lubricant in the individual gear modules G1, G2, G3, and G4 is presented in Table 3.  
The results of the lubricant condition analysis in gear module G1 after the first hour of run-in are presented in Figure 6.  
In a similar manner, the results of the analysis were processed for the other gear modules. A comparison of the results according to ISO 4406 for all four gear modules is presented in Table 4.  
The evaluation results indicate that the level of contamination of the lubricant is approximately uniform across all gear modules.  
To provide a more detailed understanding of the wear mechanisms and contamination processes, two gear units--G1 and G3--were selected for in-depth analysis. The selection criterion was based on the measured levels of lubricant contamination observed after 32 weeks and 32 h of operational testing. Gearbox G1 exhibited the lowest level of con  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Module G1** & \multicolumn{3}{c}{**Module G2**} & \multicolumn{3}{c}{**Module G3**} & \multicolumn{3}{c}{**Module G4**} \\ \hline Part/1 mL & \multicolumn{3}{c}{Part/1 mL} & \multicolumn{3}{c}{Part/1 mL} & \multicolumn{3}{c}{Part/1 mL} \\ \textgreater{}4 \(\mu\)m(c): 132,981.6 & 24 & \textgreater{}4 \(\mu\)m(c): 9762.7 & 20 & \textgreater{}4 \(\mu\)m(c): 33,504.6 & 22 & \textgreater{}4 \(\mu\)m(c): 291,689.4 & 25 \\ \textgreater{}6 \(\mu\)m(c): 36,568.9 & 22 & \textgreater{}6 \(\mu\)m(c): 8695.1 & 20 & \textgreater{}6 \(\mu\)m(c): 30,250.9 & 22 & \textgreater{}6 \(\mu\)m(c): 78,166.6 & 23 \\ \textgreater{}8 \(\mu\)m(c): 2700.6 & 19 & \textgreater{}8 \(\mu\)m(c): 1775.9 & 18 & \textgreater{}8 \(\mu\)m(c): 4711.0 & 19 & \textgreater{}8 \(\mu\)m(c): 2451.3 & 18 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Lubricant condition after the first hour of run-in according to ISO 4406.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Chemical** & **Otigear** & **Lubricant** & **Lubricant** & **Lubricant** & **Lubricant** \\
**Element** & **ALR 150** & **in G1** & **in G2** & **in G3** & **in G4** \\ \hline Ag & 0.01 & 0.03 & 0.02 & 0.03 & 0.03 \\ Al & 0.36 & 1.68 & 1.75 & 0.86 & 3.25 \\ B & 4.78 & 0.94 & 2.8 & 0.73 & 2.66 \\ Ba & 0.25 & 0.85 & 0.82 & 0.50 & 0.96 \\ Ca & 0.06 & 11.20 & 13.95 & 9.92 & 12.59 \\ Cd & 0.18 & 0.11 & 0.07 & 0.11 & 0 \\ Cr & 0.25 & 0.73 & 1.06 & 0.49 & 1.79 \\ Cu & 0 & 0.74 & 0.74 & 0.11 & 0.53 \\ Fe & 0.33 & 36.61 & 40.72 & 19.60 & 32.88 \\ K & 0.01 & 0.98 & 0.45 & 0.18 & 0.52 \\ Mg & 2.54 & 4.11 & 4.26 & 3.12 & 3.96 \\ Mn & 0.02 & 2.31 & 4.33 & 0.82 & 2.72 \\ Mo & 0.41 & 29.17 & 12.84 & 13.89 & 12.75 \\ Na & 0 & 6.52 & 7.57 & 0.80 & 5.99 \\ Ni & 0 & 1.0 & 0.98 & 0.59 & 1.02 \\ P & 1627.0 & 1434.0 & 1458.5 & 1477.0 & 1475.5 \\ Pb & 0 & 0.20 & 0.43 & 0.32 & 0.30 \\ Sb & 1.9 & 4.08 & 7.10 & 7.72 & 6.20 \\ Si & 0.18 & 23.28 & 21.65 & 19.40 & 16.73 \\ Sn & 1.88 & 1.89 & 1.23 & 0.59 & 1.32 \\ Ti & 0.71 & 1.12 & 1.03 & 1.19 & 1.04 \\ V & 0.38 & 0.30 & 0.37 & 0.43 & 0.70 \\ Zn & 0 & 25.80 & 19.82 & 6.4 & 20.28 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Elemental lubricant analysis in individual modules.  
tamination, while gearbox G3 showed the highest. This contrast allows for a comparative assessment of the system's performance under different contamination conditions.