20.9 GEAR BOX( ELECTRICAL CONTROL VALVE DETAILS)

Transmission Hydraulic Circuit

RUNNING FORWARD AND BACKWARD VALVE

PRESSURE REGULATOR VALVE (14,5 ± 1 bar)

CONVERTER RELIEF VALVE (6,5 ± 1,5 bar)

REVERSE TEST POINT FORWARD TEST POINT

4WD CLUTCH CLUTCH RUNNING BACKWARD

4WD SOLENOID VALVE

LUBE PRESSURE TEST

CONVERTER PRESSURE TEST POINT

TEMPERATURE SENDER SUCTION STRAINER

PUMP

OIL FILTRER

TORQUE CONVERTEUR

CLUTCH RUNNING FORWARD COLD START VALVE (26 bar)

20.11.1 CLUTCH CIRCUIT

The oil is sucked into the casing via the suction strainer. The oil leaving the pump passes into the filter and is directed towards the clutch circuit. The filter is protected by a cold start valve calibrated to 26 bars. On the filter outlet, the pressure regulator mark A maintains a pressure of 14 +/- 1 bar in the clutch circuit. The same regulator supplies the converter circuit.

The electrovalves mark B enable the pressure to be directed towards the front and reverse gear clutches, and in neutral gear they enable the clutches to be decompressed towards the casing.

On the 4WD “sprung on” version, the clutch is engaged by a spring. When the 4WD electrovalve mark C is fed,the pressure is applied on the piston which pushes the spring back and frees the 4WD clutch.

20.11.2 CONVERTER CIRCUIT

The oil passes into the converter circuit through the pressure regulator mark A. The pressure limiter mark D maintains a pressure of 6.5 +/- 1.5 bar in the circuit.

20.11.3 COOLING AND LUBRICATION CIRCUIT

The oil returning from the converter passes via the inside of the pump’s hollow shaft, heads towards the oil cooler and then returns into the transmission shaft to lubricate the gears and the bearings on the inlet shaft A.

P1 = Oil pump pressure test point (14,5 ± 1 Bar).

P2 = Forward clutch pressure test point (14,5±1,5 Bar).

P3 = Reverse clutch pressure test point (14,5 ± 1,5 Bar).

P4 = Converter relief pressure test point (6,5 ± 1,5 Bar).

P5 = Four wheel drive pressure test point (14,5±1,5 Bar).

P6 = Lubrication pressure test point (1,5±1 Bar).

T1 = Temperature test W.