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• Fernando Ortiz

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Copyright 1991, 2013 Caterpillar Inc. All Rights Reserved.

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5HM03642 140H MOTOR GRADER Operación de Sistemas Número de publicación SENR9159-04 Fecha de publicación 2004/04/01 Fecha de actualización 2004/04/07

Power Train Hydraulic System SMCS Code: 3000; 3100; 4000

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Illustration 2

Transmission Hydraulic System Schematic in the FIRST SPEED FORWARD Position (1) Transmission lubrication. (2) Transmission oil cooler. (3) Cooler bypass. (4) Manual modulation inching valve. (5) Transmission pressure switches. (6) Main relief valve. (7) Priority reducing valve. (8) Differential lock clutch and differential lock valve. (9) Transmission lubrication relief valve. (10) Transmission filter. (11) Transmission oil pump. (12) Transmission scavenge pump. (13) Transmission charging pump. (14) Transmission shift pattern (first speed forward). (15) Solenoid valve (clutch three). (16) Solenoid valve (clutch one). (17) Solenoid valve (clutch two). (18) Solenoid valve (clutch eight). (19) Solenoid valve (clutch four). (20) Solenoid valve (clutch six). (21) Solenoid valve (clutch five). (22) Solenoid valve (clutch seven). (23) Centershift lock solenoid. (24) Centershift lock group. (25) Transmission screen and magnetic filter.

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(26) Transmission scavenge screen and magnetic filter. (27) Transmission drain relief valve. (28) Transmission sump. (29) Differential sump. (30) Power train oil temperature sensor. (A) Modulation reducing valve (clutch three). (B) Modulation reducing valve (clutch one). (C) Modulation reducing valve (clutch two). (D) Modulation reducing valve (clutch eight). (E) Modulation reducing valve (clutch four). (F) Modulation reducing valve (clutch six). (G) Modulation reducing valve (clutch five). (H) Modulation reducing valve (clutch seven). (AA) Pump pressure. (BB) Clutch pressure. (CC) Priority reducing valve or pilot pressure. (FF) Lubrication pressure. (HH) Blocked oil. (LL) Tank or case drain. Note: The 143H and the 163H All Wheel Drive Motor Graders use hydraulic oil supplied from the all wheel drive charge pump to operate the centershift lock cylinder.

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Illustration 3

Electronic Monitoring System Operator Panel (EMS) (31) Transmission cold oil indicator.. When the engine is started, the oil from transmission oil pump (11) supplies oil to the power train oil system of the motor grader. If the hydraulic oil in the transmission is equal to 0.0° C (32° F) or lower than 0.0° C (32° F), temperature sensor (30) will send a signal to the EMS in the operator's compartment. Transmission cold oil indicator (31) will illuminate. Before engaging the transmission, allow the oil to warm up until the transmission cold oil indicator turns off.

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Unexpected movement may occur with cold drive train oil. This movement could result in injury or death. Warm up the machine before shifting out of the PARK position. See the Operation and Maintenance Manual for the proper operation in cold weather.

Transmission oil pump (11) rotates at the same speed as the input shaft. Transmission oil pump (11) is driven by a three gear transfer train from the input shaft, with the reverse gear acting as an idler gear. Transmission oil pump (11) contains transmission scavenge pump (12) and transmission charging pump (13). Transmission scavenge pump (12) transfers oil from transmission sump (28) to differential sump (29). Transmission charging pump (13) transfers oil from differential sump (29) to transmission filter (10). When you view transmission oil pump (11) from the front of the engine, the transmission pump rotates clockwise. The transmission pump supplies oil at a rate of 105 L/min (27.9 US gpm) at 2000 RPM. The bottom of the transmission case provides lube oil to transmission sump (28). Oil flows to differential sump (29) by flowing through transmission scavenge screen and magnetic filter (26). Then, the oil flows to the transmission scavenge pump (12) section of the transmission oil pump (11). A breather line connects the transmission and the differential in order to equalize the air pressure in the two compartments. A breather that is located on the oil filler tube provides the capability for ambient breathing. The oil filler tube extends to the differential case. Oil is supplied to transmission scavenge pump (12) through a tube and from a hose from the differential housing. The oil passes through a transmission screen and magnetic filter (25), that is contained within a housing that is located within transmission oil pump (11). Pressurized oil from transmission charging pump (13) flows to transmission filter (10) through cored passages in transmission oil pump (11). After the oil flows through transmission filter (10) the pressurized oil flows through a hose to a fitting on the side of the transmission case. If the transmission control valve has a pressure setting of 2760 kPa (400 psi) at 750 engine RPM, the pressurized oil will flow through a cored passage in the transmission case to main relief valve (6) and to priority reducing valve (7). This directs oil to the selector valves and to the solenoids. This oil then returns to transmission sump (28). Excess oil from the main relief valve (6) flows through a cored passage in the transmission case and to a fitting on the side of the case. The oil then flows through a hose to the transmission oil cooler (2). There are two different types of transmission oil coolers on these machines. The 120H and the 135H are equipped with an air cooled transmission cooler that is mounted next to the machines radiator. All other models covered in this manual use a transmission oil cooler that cools using engine coolant and is mounted next to the engine. The cooled oil is used for the transmission lubrication. The cooled oil flows through another hose to a fitting on the side of the transmission case. Then, the oil flows through a cored passage in the

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transmission case. Next, the oil flows to a passage in the bottom half of the control manifold of the transmission. Lubrication oil flows from the manifold through drilled holes in the transmission case to each shaft end. Then, the oil flows into the shaft in order to provide lubrication to the bearings and to the clutch packs. The oil then returns to transmission sump (28). The transmission cooler bypass (3) is located in the transmission case underneath the transmission control valve. The cooler bypass (3) relieves the transmission lube when the differential between the cooler inlet pressure and lube inlet pressure is greater than 520 kPa (75 psi). Also, there is a poppet type valve for transmission lubrication relief valve (9) that is located in the transmission case underneath the transmission control valve. This relief valve vents lube flow to transmission sump when the lube inlet pressure is greater than 520 kPa (75 psi). Copyright 1991, 2013 Caterpillar Inc. All Rights Reserved.

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