BLOCK-TERMINAL 4844644 - Caterpillar

Illustration 4 g02559076
Transmission Lubrication
(1) Planetary gears
(3) No. 1 clutch
(6) Planetary gears
(7) No. 2 clutch
(10) No. 3 clutch
(16) No. 5 clutch
(17) Planetary gears
(19) No. 6 clutch
(20) Planetary gears
(22) No. 7 clutch
(24) Planetary gears
(27) Planetary gears
(31) Passage for converter inlet oil
(32) Balance piston for No. 2 clutch
(33) Bearing
(34) Lubrication inlet passage
(35) Bearing
(36) Bearing
(37) Balance piston for No. 4 clutch
(38) Passage
(39) BearingOil for lubrication of the transmission flows from the transmission oil cooler. Also, lubrication oil is provided by the retarder control valve on wheel tractors. In both cases, oil flows downward through the distribution manifold in the bottom of the transmission hydraulic control group.Lubrication oil to the transmission is supplied through two different passages. Converter inlet oil from passage (31) in the No. 1 clutch housing lubricates bearing (39), No. 1 clutch (3) and planetary gears (1). Oil is also routed to the rearward side of balance piston (32) through passage (38).The second path for lubrication oil is through passage (34) in the No. 4 clutch housing. This oil divides. Some of the oil flows downward through passage (34) to center shaft (11). This oil flows toward the input of the transmission. Some of this oil lubricates bearing (33) and No. 3 clutch (10). The remainder of this oil continues along center shaft (11) to the void between input shaft (30) and center shaft (11). This oil is routed to planetary gears (6) and No. 2 clutch (7). This oil also flows through center shaft (11) to bearing (36). The oil that is routed toward the output of the transmission lubricates the following components:
Bearing (35)
Balance piston for No. 4 clutch (37)
Planetary gears (17)
Planetary gears (20)
Planetary gears (24)
Planetary gears (27)The balance of the oil from passage (34) is routed rearward through the clutch housings. This oil lubricates No. 5 clutch (16), No. 6 clutch (19) and No. 7 clutch (22).Operation of the Balance Pistons in the Rotating ClutchesThe oil that flows to balance piston (32) for the No. 2 clutch and balance piston (37) for the No. 4 clutch is used to balance the force of the oil. The force of the oil (centrifugal force) is caused by the rotation of the No. 2 clutch (7) and the No. 4 clutch (13). The centrifugal force of the oil behind the clutch piston in the rotating clutches causes a small amount of clutch engagement (clutch drag) in the rotating clutch. The force of the oil that is behind the balance piston balances the centrifugal force of the oil that is on the clutch piston. The force of the oil that is behind the balance piston can also remove the centrifugal force of the oil that is on the clutch piston.