PLATE 5D0973 - Caterpillar

Illustration 1 g00646735
Typical view of the lubrication of the transmission
(1) Input shaft
(2) Clutch hub
(3) Ring gear
(4) Planetary gears
(5) Planetary gears
(6) Ring gear
(7) Sun gear
(8) Sun gear and ring gear
(9) Planetary gears
(10) Ring gear
(11) Ring gear
(12) Planetary gears
(13) Sun gear
(14) Ring gear
(15) Planetary gears
(16) Sun gear
(17) Planetary carrier
(18) First clutch
(19) Planetary carrier
(20) Second clutch
(21) Third clutch rotating
(22) Third clutch housing
(23) Center shaft
(24) Fourth clutch housing
(25) Fourth clutch rotating
(26) Planetary carrier
(27) Fifth clutch
(28) Planetary carrier and output shaft
(29) Sixth clutch
(30) Seventh clutch
(31) Planetary carrier
(32) Front bearing cage
(33) Third balance piston
(34) Inlet passage
(35) Fourth balance piston
(36) Housing
(37) Bearing
(38) Passage Oil for the lubrication of the transmission comes from the transmission section of the hydraulic tank. The pump for the transmission charging sends oil through the oil filter to the selector and pressure control valve. Oil from the selector and pressure control valve is split. Some of the oil is used to lubricate the transfer gears. The rest of the oil is used to lubricate the transmission. The transmission lubrication oil goes to a manifold.Oil from the manifold of the pressure control valve enters the transmission through passage (34). The oil is routed in three directions. Oil travels forward from passage (34) to front bearing cage (32). This oil lubricates first clutch (18) and second clutch (20).The oil in passage (34) is also routed to center shaft (23). Once the oil reaches the center shaft, the oil splits in two directions. Oil travels forward through the bearing and through third clutch housing (22) to the back side of third balance piston (33). The oil travels through ring gear (6) to third clutch (21). This oil lubricates planetary gears (4) and (5). Oil leaves through passage (38) in planetary carrier (19). This oil also helps to lubricate second clutch (20).Oil that is routed rearward along center shaft (23) travels to the back side of fourth balance piston (35). The oil then travels to fourth clutch (25). Oil passes through sun gear and ring gear (8) into planetary carrier (26). This oil lubricates planetary gears (9) and fifth clutch (27). Oil continues along center shaft (23) through sun gear (13) into the output shaft of planetary carrier (28). The oil then lubricates planetary gears (11) and sixth clutch (29).some oil continues along center shaft (23) to lubricate bearing (36).The last routing of oil from passage (34) is rearward through the housings to housing (37). The oil travels through housing (37) to planetary gears (15) and to seventh clutch (30).Operation of the Balance Pistons in the Rotating Clutches
The oil that flows to balance piston (33) of the third clutch and to balance piston (35) of the fourth clutch is used to balance the centrifugal force of the oil. The centrifugal force of the oil is caused by the rotation of the third clutch and the fourth clutch. The centrifugal force of the oil