966G Wheel Loader 3ZS00001-UP (MACHINE) POWERED BY 3306 Engine(SEBP256...
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Producto: WHEEL LOADER
Modelo: 966G WHEEL LOADER 3ZS00372
Configuración: 966G Wheel Loader 3ZS00001-UP (MACHINE) POWERED BY 3306 Engine
Operación de Sistemas
966G Wheel Loader and 972G
Wheel Loader Power Train
Número de medio -RENR2104-05 Fecha de publicación -01/08/2010 Fecha de actualización -24/08/2010
i01493730
Transmission Hydraulic System
SMCS - 3000
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966G Wheel Loader 3ZS00001-UP (MACHINE) POWERED BY 3306 Engine(SEBP256... Page 2 of 4
Illustration 1 g00666062
Schematic for the Transmission Hydraulic System
(1) Transmission hydraulic control relief valve
(2) Torque converter
(3) Torque converter outlet relief valve
(4) Transmission oil filter
(5) Transmission clutch modulating valve for the Number 1 clutch
(6) Transmission clutch modulating valve for the Number 4 clutch
(7) Transmission clutch modulating valve for the Number 2 clutch
(8) Transmission clutch modulating valve for the Number 5 clutch
(9) Transmission clutch modulating valve for the Number 3 clutch
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966G Wheel Loader 3ZS00001-UP (MACHINE) POWERED BY 3306 Engine(SEBP256... Page 3 of 4
(10) Transmission clutch modulating valve for the Number 6 clutch
(11) Transmission oil pump
(12) Torque converter inlet relief valve
(13) Suction screen and magnet
(14) Oil sump
(15) Transmission lubrication
(16) Oil cooler
(A) Pump pressure tap
(B) P3 Torque converter inlet pressure tap
(C) Torque converter outlet pressure tap
(D) Sampling valve for the transmission oil
(F) Number 1 clutch pressure tap
(G) Number 4 clutch pressure tap
(H) Number 2 clutch pressure tap
(J) Number 5 clutch pressure tap
(K) Number 3 clutch pressure tap
(L) Number 6 clutch pressure tap
(M) Transmission lubrication pressure tap
The transmission hydraulic system consists of the following components: suction screen and magnet
(13), transmission oil pump (11), transmission oil filter (4), transmission hydraulic control relief valve
(1), transmission clutch modulating valves (5-10), torque converter (2), torque converter inlet relief
valve (12), torque converter outlet relief valve (3) and oil cooler (16) .
The bottom of the output transfer gear case contains oil sump (14). Transmission oil pump (11) is a
one-section gear type pump. Transmission oil pump (11) is a positive displacement pump.
Transmission oil pump (11) supplies oil to the transmission hydraulic system. Transmission oil pump
(11) pulls oil from oil sump (14). The oil flows through the suction screen and magnet (13). Oil is
supplied to the pump inlet through a tube that is mounted to the pump inlet and the output transfer
gear case. Pressurized oil exits the pump outlet and flows to externally mounted transmission oil filter
(4). Pressurized oil flows from transmission oil filter (4) through an external hose to the torque
converter housing. Pressurized oil then flows through internal passages in the torque converter
housing. Transmission hydraulic control relief valve (1) receives some of the pressurized oil flow.
Transmission clutch modulating valves (5-10) receive some of the pressurized oil flow.
Transmission clutch modulating valves (5-10) are mounted on the top of the transmission under the
cab. The six transmission clutches have an individual transmission clutch modulating valves (5-10).
In order to move the machine, a direction clutch solenoid and a speed clutch solenoid must be
energized. The transmission clutch modulating valves (5-10) are used to directly modulate the oil
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966G Wheel Loader 3ZS00001-UP (MACHINE) POWERED BY 3306 Engine(SEBP256... Page 4 of 4
pressure that is sent to each individual clutch. The clutch leakage oil and the return oil flows to the
bottom of the transmission. The nonenergized transmission clutch modulating valves (5-10) return the
oil flow to the bottom of the transmission. The oil then flows to oil sump (14) in the bottom of the
output transfer gear case.
Transmission hydraulic control relief valve (1) controls the pressure of the oil that flows to
transmission clutch modulating valves (5-10). Oil flows into transmission hydraulic control relief
valve (1) at a maximum pressure of 2930 kPa (425 psi). The oil pressure overcomes the spring force
of transmission hydraulic control relief valve (1). Torque converter inlet oil then flows to torque
converter (2) at 550 kPa (80 psi).
Torque converter inlet relief valve (12) limits P3 torque converter inlet oil to a maximum pressure of
900 ± 70 kPa (130 ± 10 psi). Torque converter inlet relief valve (12) is located in the torque converter
housing. Transmission hydraulic control relief valve (1) is located above the torque converter inlet
relief valve. Transmission hydraulic control relief valve (1) must be removed in order to attain access
to the torque converter inlet relief valve.
The outlet oil from torque converter (2) flows to torque converter outlet relief valve (3). Torque
converter outlet relief valve (3) maintains the oil pressure inside the torque converter at a specific rate.
Torque converter outlet relief valve (3) maintains the oil pressure inside the torque converter at 414 ±
14 kPa (60 ± 2 psi). The oil flows from the torque converter outlet relief valve to oil cooler (16) .
Oil cooler (16) is located on the right side of the engine. After the oil has been cooled, the oil flows to
the transmission. The oil provides lubrication to the transmission and cooling to the transmission. The
oil flows through internal passages in the transmission to the bearings, the gears and the clutches. The
oil then flows to the bottom of the transmission. The oil then flows to oil sump (14) in the bottom of
the output transfer gear case.
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