CX31-P600 Petroleum Transmission General Information Caterpillar


General Information
`
1.1. Introduction

Introduction

The power train is made up of the following three basic systems:

  • Power train electronic control module

  • Torque converter

  • Transmission planetary and transmission

The three basic systems have a hydraulic connection, an electrical connection, a magnetic connection, or a mechanical connection. Power is supplied from the engine to the torque converter and goes to the transmission. If the transmission is in gear, power flows from the transmission to the output shaft. The operation of the power train begins at the power train Electronic Control Module (ECM). The power train ECM receives information about the selected speed of operation through the shifter in the electrical system. The power train ECM uses information from several sensors in the electrical system to control the torque converter and the transmission hydraulic system by energizing the appropriate solenoids.

The rotating housing of the torque converter is fastened directly to the engine flywheel. The torque converter has a lockup clutch for direct drive and a one-way clutch for the torque converter drive. During torque converter drive, power is transmitted through the torque converter hydraulically to the transmission. During direct drive, there is a direct connection between the engine flywheel and the transmission.

The power train ECM will hydraulically activate the lockup clutch solenoid for direct drive operation. The full power from the engine flywheel is transmitted through the torque converter when the torque converter is in direct drive. The lockup clutch becomes a direct connection between the rotating housing and the output shaft of the torque converter. The output shaft of the torque converter is connected to the planetary. The power train ECM will activate the appropriate Electronic Clutch Pressure Control (ECPC) valves in order to activate the correct transmission clutches when shifts are needed. The transmission clutches mechanically connect the transmission input shaft to the output shaft. Different combinations of clutches result in different gears and the transmission output shaft speeds. Refer to Table 1 for combinations of different gears and transmission output shaft speeds.

Table 1
CX31-P600 Transmission Clutch Assignments 
Operation  Gear Ratios  Clutches  Transmission Output Speed at 800 RPM Input with LUC Engaged (RPM)  Transmission Output Speed at 1200 RPM Input with LUC Engaged (RPM) 
1 2 3  4  5 
Neutral           
1 Forward  4.40        182  500 
2 Forward  2.33        343  943 
3 Forward  1.53        552  1435 
4 Forward  1.00        800  2200 
5 Forward  0.72        1114  3062 
6 Forward  0.61        1315  3617 
Reverse  -3.97        202  554 
Park         
Warm-up       

When the output shaft of the transmission is rotating, the speed sensors send an AC frequency signal (HZ) that matches the number of gear teeth that are passing the sensor per second to the ECM. The ECM compares the frequency from the speed sensor (HZ) to the number of pulses per revolution in order to determine the speed of the rotating components. The ECM uses the input from the speed sensors in order to regulate transmission shifts.

The CX31-P600 transmission has six forward gears. The ECM will engage the desired gear and speed depending on the gear selected by the operator and transmission ECM programming, which is dependent on the following: operating mode, load factors, output speed of the torque converter and the output speed of the transmission. The torque converter will be in torque converter drive for a short time during transmission shifts. This provides smoother engagement of the transmission clutches.

The torque converter hydraulic system uses oil that is also common with the transmission hydraulic system. These systems use the same section of the transmission case. Some of the components in the torque converter hydraulic system include the following: a torque converter inlet relief valve, a torque converter outlet relief valve, a gear pump and a torque converter lockup clutch. Pressurized oil that will engage the lockup clutch comes from the gear pump. Oil flows from the gear pump through the transmission filter. Some of the oil will then be sent to the torque converter lockup clutch. When the ECM signals the torque converter lockup clutch solenoid, oil will flow through the solenoid and the torque converter lockup clutch will engage.

Oil from the transmission oil filter also flows to the torque converter inlet relief valve and into the torque converter. Oil exits the torque converter and flows through the torque converter outlet relief valve. Oil from the outlet relief valve goes through the cooler and the oil is then used to lubricate the transmission. Components of the transmission hydraulic system include the following: a transmission hydraulic control, transmission gear pump, hydraulic filter of the transmission, transmission magnetic screen and a transmission oil cooler. The transmission gear pump sends oil through the filter of the transmission and the oil is then sent to the transmission hydraulic control. The basic components of the transmission hydraulic control are the ECPC valves. This oil also supplies the lockup clutch solenoid. The solenoids connect the electrical systems and the hydraulic systems.

Information System:

C15 and C18 On-Highway Engines Air Inlet Elbow - Remove and Install
C9 Petroleum Engine Product Description
C280-08 Marine Engine Engine Power Ratings
C15 and C18 On-Highway Engines Combustion Head - Remove and Install
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Solenoid Valve - Test
C6.6 Industrial Engine Exhaust Gas Valve (NRS) - Remove and Install
C15 and C18 Engines for Caterpillar Built Machines Gear Group (Rear)
C15 and C18 Engines for Caterpillar Built Machines Valve Rocker Arm
C15 and C18 On-Highway Engines Precooler - Remove and Install
C175-16 Engine Fuel Flow Is High
C15 and C18 On-Highway Engines Water Pump - Remove and Install
C15 and C18 On-Highway Engines Inlet and Exhaust Valve Seat Inserts - Remove and Install
CX31-P600 Petroleum Transmission Transmission Planetary
C280-12 Marine Engine Engine Power Ratings
Installation Procedure For The New Throttle Body Cooling Lines On Certain G3500 Engines{1380}
C280-08 Marine Engine After Stopping Engine
C15 and C18 On-Highway Engines Engine Oil Cooler - Remove and Install - C18
C15 and C18 On-Highway Engines Engine Oil Cooler - Remove and Install - C15
2013/11/13 New Exhaust Temperature Sensor Groups Are Used on Certain 3500, 3600, C175, and C280 Marine and Petroleum Off-Shore Applications {1408, 1900, 1906, 1919, 1921, 1922, 1928, 1929, 7498}
12M Series 3, 140M Series 3, 160M Series 3, 140, 150 and and 160 Motor Graders Blade Cushion - If Equipped
G3500H Generator Set Engine Air/Fuel Ratio Control - NO<SUB>X</SUB> Feedback
C15 and C18 On-Highway Engines Engine Oil Filter Base - Remove and Install - C18
G3500H Generator Set Engine Lubrication System
C15 and C18 On-Highway Engines Engine Oil Filter Base - Remove and Install - C15