TM 5-2410-241-23-1
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PRIMARY POWERTRAIN CONTINUED
Transmission Lubrication
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Planetary Lubrication
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The oil for lubrication of the transmission comes from the lubrication distribution manifold and the main relief valve.
Oil from the oil cooler flows through the tube assembly (Figure 13, Item 5) to the manifold (Figure 13, Item 6). Oil
from manifold flows through the passage (Figure 13, Item 3) to the cavity (Figure 13, Item 9) and the drilled
passages in the input shaft (Figure 13, Item 8). The passage (Figure 13, Item 3) is formed by the clutch housings.
Cavity (Figure 13, Item 9) sends oil to cavity (Figure 13, Item 2). Drilled passages in the No. 1 carrier (Figure 13,
Item 10) and the No. 2 and 3 carrier (Figure 13, Item 1) send oil to the direction clutches and the No. 3 clutch.
Oil is metered to the direction clutches. The FORWARD ring gear and the REVERSE ring gear have drilled oil
passages. Oil flows through the drilled passages to the direction clutches.
Oil comes through the drilled passages in the input shaft (Figure 13, Item 8) and flows to the clearance between
the input shaft and the output shaft. The oil lubricates bearings at both ends of the output shaft. The oil then flows
through drilled passages in the output shaft to cavity (Figure 13, Item 4) and hub (Figure 13, Item 7).
Planetary bearings and thrust discs get oil from cavities (Figure 13, Item 9) and (Figure 13, Item 4) through the
drilled passages in the planetary shafts. Drilled passages in the hub (Figure 13, Item 7) and the ring gear for the
No. 4 clutch send oil to the No. 5 and No. 4 clutches for lubrication.
The gears throw oil around the housing and this lubricates the rest of the components. Oil is also released at
pressure/flow points. Lubrication oil flows through the clutches and drains to the bottom of the transmission case.
Figure 13. Planetary Lubrication.
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