| NOTICE |
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The Operations and Maintenance Manual and Installation Guides are stored and printed from an electronic file. These files are revised periodically. To ensure that your hard copy of the document is the current version, consult your Caterpillar Representative. All paper copies are uncontrolled. |
Special Instructions, REHS2790, "Application and Installation CX31 Transmission (Mechanical)"
Special Instructions, REHS2884, "Application and Installation CX31 Transmission (Electrical)"
Parts Manual, SEBP5959, "CX31 On-Highway Transmission"
Disassembly and Assembly, UENR0125, "CX31 Transmission"
Systems Operation, Troubleshooting, Testing and Adjusting, KENR8274, "CX31 Transmission"
Specifications, System Operation, Testing and Adjusting, UENR1833, "CX31 Transmission"
Schematic, UENR1796, "Electrical", "CX31 Transmission"
Caterpillar Reference Material
Special Publication, PECP9067, "One Safe Source"
Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations"
Special Publication, SEBU5898, "Cold Weather Recommendations"
Special Instruction, SEHS9031, "Storage Procedure for Caterpillar Products"
Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide"
Service Manual, SENR3130, "Torque Specification Module"
Special Publication, PEHP7076, "Understanding S·O·S Services Tests"
Special Publication, PEHP6001, "How to Take a Good Oil Sample"
SAE J754, "Nomenclature" Nomenclature can normally be found in the SAE handbook.
SAE J183, "Classification" Classification can normally be found in the SAE handbook.
On-Highway vehicles operate elusively on roads that are improved or normally paved. Typical vocations are: pickup and delivery, beverage delivery, public service dump trucks, utility trucks, tank trucks and tour coaches.
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Severe Duty
On/Off Highway: Vehicles that operate both on and off highway. Typical vocations: dump, transit mixers, all wheel drive, utility, snow removal, yard spotter, concrete pumper and other vocations with severe PTO applications.
Refuse: Refuse and garbage disposal applications.
HET: Heavy equipment transport.
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Emergency Vehicles: Fire trucks that are typically designed to NFPA guidelines.
| Item Description | CX31 | |||
|---|---|---|---|---|
| CT11 | CT13 | CT15 | ||
| Maximum Gross Input Power | hp (kW) | 390(291) | 475 (354) | 550 (410) |
| Maximum Gross Input Torque | lb-ft (N.m) | 1450 (1965) | 1700 (2305) | 1850 (2508) |
| Maximum Turbine Torque (forward) | lb-ft (N.m) | 2600 (3525) | 2600 (3525) | 2600 (3525) |
| Maximum Turbine Torque (reverse) | lb-ft (N.m) | 2200 (2983) | ||
| Rated Input Speed | rpm | 2100 | ||
| Minimum Input Speed | rpm | 600 | ||
| Maximum Input Speed | rpm | 2500 | ||
| Dry Weight Without Retarder(1) | lb (kg) | 906 (411) | ||
| Dry Weight With Retarder(1) | lb (kg) | 1088 (494) | ||
| - | ||||
| - | ||||
| Forward Reverse Gears | 6F/1R | |||
| Planetary Gear Ratios | ||||
| 1F | 4.40 | |||
| 2F | 2.33 | |||
| 3F | 1.53 | |||
| 4F | 1.00 | |||
| 5F | 0.72 | |||
| 6F | 0.61 | |||
| 1R | 3.97 | |||
| Overall | 7.21 | |||
| Torque Converters | ||||
| TC42531 | STR 2.7 | |||
| TC42833 | STR 1.9 | |||
| (1) | This transmission does not include the following components: crankshaft adapter, flex plates, starter ring gear, bolts, output yoke and ECU. ( |
| Acronyms | Description |
|---|---|
| A and I | Application and Installation |
| A/C | Air Conditioner |
| ABS | Anti-lock Braking System |
| CID | Component Identifier Diagnostic (code that informs the service personnel of specific component or system failure) |
| CTS | Controlled Throttle Shifting (significantly reduces power train stress and clutch wear by controlling engine speed, torque converter lockup, and transmission clutch engagement) |
| ECM | Engine Control Module (controls all aspects of engine emission compliance, performance, operator/chassis interaction, and diagnostics) |
| ECU | Electronic Control Unit (electronic device used to control transmission functions) |
| ECPC | Electronic Clutch Pressure Control (design senses input from the transmission and the operator controls in order to modulate each individual clutch through a proportional electro-hydraulic valve) |
| FWH | Flywheel Wheel Housing |
| HET | Heavy Equipment Transport |
| LUC | Lockup Clutch |
| OEM | Original Equipment Manufacturer |
| PT | Power Train (transmission and auxiliary components) |
| PTO | Power Take-Off (referred to in this manual is engine rpm control initiated through a dedicated PTO ON/OFF switch circuit connected to the ECM Input No. 1) |
| SAE | Society of Automotive Engineers (standards) |
| STR | Stall Torque Ratio (torque converter stall torque ratio) |
| OMM | Operation and Maintenance Manual |
| kPa | x 0.145 = pressure (PSI) |
| bar | x 14.5 = pressure (PSI) |
| kW | x 1.34 = horsepower |
| L/min | x 0.26 = gallons/min |
| N·m | x 0.74 = ft × lb |
| S·O·S | Scheduled Oil Sampling |