WATERCOOLED TURBOCHARGER HOUSING LINES GROUP 8N5797 - Caterpillar

Location Of Components
Illustration 3 g03142716
Right side of the CX48-P2300 Transmission
(2) 134-2252 Temperature Sensor Gp (part of 359-5431 Transmission Case and Parts Gp)
(3) 148-1928 Inlet Relief Valve
(9) Internal location of 318-1850 Gear Pump Gp
(11) 244-3114 Modulating Valve Gp (part of 359-5430 Torque Converter Housing Gp)
(12) 346-7685 Oil Filter Gp
(13) 346-7687 Oil Filter Gp
(15) 6V-3965 Fitting (part of 359-5431 Transmission Case and Parts Gp)
(16) 258-8987 Modulating Valve Gp (part of 383-3004 Transmission Hydraulic Control Gp)
(17) 308-2995 Relief Valve Gp (part of 383-3004 Transmission Hydraulic Control Gp)
Illustration 4 g03142717
Left side of the CX48-P2300 Transmission
(6) 201-6615 Speed Sensor Gp (part of 364-6659 Transmission Coupling Gp
(7) 201-6615 Speed Sensor Gp (part of 359-5429 Transmission Planetary Gp
(10) 130-6747 Screen As and 348-7790 Tube As (part of 359-5431 Transmission Case and Parts Gp)
(14) 304-5687 Electronic Control Module Transmission Hydraulic System
Illustration 5 g03177344
(16) Modulating valve
(18) ECPC solenoid
(19) Engaged clutch
(20) Pressurized oil
(21) Disengaged clutch Oil is supplied by the transmission pump through a filter. The oil is available to each modulating valve (16).Control of the transmission planetary is achieved by hydraulically actuated clutches that hold selected components of the planetary group stationary. Holding selected components allows the transition of power in the selected gear (speed ratio) through the transmission.Shifting of the transmission is controlled by the electronic control module (ECM). The ECM acts in response to various inputs.Inputs to the ECM module include the following information:
Selected gear
Engine speed
Torque converter output speed
Transmission output speed
Gear limits
Transmission oil temperature
Torque converter outlet oil pressureShifting of the transmission gears involves the release of one clutch and the subsequent engagement of the next clutch.Each clutch is engaged by hydraulic oil pressure that is supplied by the modulating valves. The modulating valves are controlled by pulse width modulated (PWM) signals. The signals are sent by the ECM to the individual solenoids (18) on each modulating valve (16).For details of the operation of the modulating valves, refer to Systems Operation, Testing and Adjusting, "Modulating Valves (Electronic Clutch Pressure Control)".The pressure of the oil in the clutches is proportional to the electrical current that is supplied to the solenoid (18) that controls the clutch.
Illustration 6 g00766511To fill a clutch, a high current input is made initially to overcome the inertia of the valve and the clutch components, and then initiates filling of the oil passage leading to the clutch piston. The current is reduced as the clutch piston is filled with oil and the plates move toward engagement. The current is held at a minimum value in order to allow the oil pressure in the piston cavity to increase slowly and smoothly take up the clearances between the disks and plates. This period is called touchup. Once touchup is achieved, current is increased gradually to ensure that maximum pressure is applied to the clutch piston in a smooth manner.Electronic control of this process provides improved quality of transmission shifts.The eight forward gears are engaged by a combination of