Lubrication Circuit (green)

TM 9-2520-249-34&P

into the planetary spindles. The surrounding range

clutches are also lubricated with this oil flow.

(2) Lockup shift valve. Pitot pressure

(2) Output planetary carriers and clutch

enters near the bottom of the lockup shift valve body

packs (fig. 2-13). Lubrication oil is directed through

and acts against the bottom of the lockup shift valve.

passages in the bevel gear housing and the cross shaft

During idle, pitot pressure is not great enough to

bearing retainers where it flows into passages in the

overcome the hydraulic and mechanical forces

reverse-range planetary carriers. This oil flow also

(converter- in circuit and spring) acting against it.

lubricates the reverse-range clutch components. Other

d. Lubrication Circuit (green). The lubrication

passages deliver lubrication oil to the steer planetary

circuit delivers oil to the various points in the

carriers, steer clutches, and the output clutches.

transmission that require positive lubrication at all times.

NOTE

(Only the main passages and cavities are colored

green.) Lubrication oil is directed to all planetary carriers

The

related

mechanical

functions

and clutch packs. Some of the delivery points are

required for this operating condition are

orificed to prevent excessive oil flow and pressure drop.

described in paragraph 2-49, and

(1) Range planetary carriers and clutch

illustrated in figure 2-14.

packs. Lubrication oil is directed into the passage in the

center of the converter output shaft where it flows

2-35.First Gear, Straight Travel Operation (fig. 2-3)

through passages in the intermediate-low sun gear and

2-15