SEAL 1666655 - Caterpillar

Illustration 1 g01422147
(1) Pump (2) Transmission case (4) Input shaft (3) Forward shaft (5) Reverse shaft (7) Speed shaft (6) Output shaft (8) SumpNote: The internal passages that are cast into the transmission housing (2) are not shown. Note: The drilled passage for the lube oil in shaft (4), shaft (5), and shaft (6) are not shown in Illustration 1 and Illustration 2.When the engine is started, the transmission oil pump (1) pulls oil from the sump (8). The transmission oil passes through a magnetic screen to the pump. The transmission oil pump sends pump oil through the transmission oil filter. Transmission oil flows to the relief valve. Pressurized transmission oil flows from the relief valve to the torque converter. The Transmission oil flows from the torque converter to the outlet relief valve for the converter. The transmission oil flows to the transmission oil cooler bypass valve then to the oil cooler. Transmission oil that is at operating temperature flows from the oil cooler to the transmission. The transmission oil flows through an internal passage of the transmission housing. Refer to System Operation, RENR8985, "Transmission Hydraulic System Schematic" for more information on the routing of the transmission oil.All the clutches in the transmission and all the bearings in the transmission are lubricated by pressurized oil. The oil flows through internal passages in the transmission case (2) to the bearings and to the clutches. The gears are lubricated by oil flow from other transmission components.
Illustration 2 g01425232
(4) Forward shaft (5) Reverse shaft (6) Speed shaft (9) Forward low port (10) Forward high port (11) Lube passage in the casting for the forward shaft bearings (12) Oil port for the reverse gear clutch (13) Oil port for the second gear clutch (14) Lube passage in the casting for the reverse shaft bearings (15) Lube port for the speed shaft bearings (16) Oil port for the third gear clutch (17) Oil port for the first gear clutchNote: The internal passages that are cast into the transmission housing (2) are not shown. Note: The drilled passage for the lube oil in shaft (4), shaft (5), and shaft (6) are not shown in Illustration 1 and Illustration 2.
Illustration 3 g01425118
(4) Forward shaft (5) Reverse shaft (6) Speed shaft (15) Lube port for the speed shaft bearings (18) Plugged lube passage in speed shaftEach of the three transmission shafts that carry clutches have three internal oil passages. One passage is for carrying the oil for the lubrication and cooling of the clutches, bearings and gears. The other two passages are for carrying pressure oil for the engagement of the clutches on each shaft.Each passage that carries pressure oil for the engagement of the clutches is plugged at the end of the shafts. Pressure oil for the clutches is supplied through ports (9), (10), (12), (13), (16), and (17) .