Cx31 Cat Transmission-student Handout

CX31 CAT TRANSMISSION

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Introduction • • • • • • •

New Cat Product 6 speed Planetary gear Powershift transmission Compatible with C9-C15 Cat Engine Torqon with lock up & free wheel stator Optional retarder

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Introduction • Electronic Clutch Pressure Control (ECPC) • Separate transmission ECM • Gear type hydraulic pump

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Introduction • • • • • •

Transmission control group at cab R – Reverse N – Neutral D – Drive Autoshift in 1st – 6th gear ↑↓ - select max up shift speed

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Major Component 2. Transmission oil filter 7. Pressure taps for main relief valve and torque converter outlet pressures

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Major Component 1. 3. 4. 5. 6.

Magnetic screen Relief valve group Oil filter bypass valve Transmission main relief valve Torqon outlet relief valve

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3

Major Component 1. 2. 3. 4.

Cover Cover Hydraulic Pump Transmission ECM

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Speed

Vs

Clutches Engaged

Neutral Reverse 1st Forward 2nd Forward 3rd Forward 4th Forward 5th Forward 6th Forward

5 3 and 5 1 and 5 1 and 4 1 and 3 1 and 2 2 and 3 2 and 4 9

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Torque Converter

• Inlet housing & Impeller (1) • Turbine & Output Shaft (2) • Freewheel stator 3)

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Relief valve group

1. Main relief valve 2400 kPa (350 psi) 2. Torque converter outlet relief valve ≅500 kPa (70 psi) 3. Torque converter inlet relief valve TCL017 Engineering Drawings

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Transmission ECM function to determine the desired transmission gear and to energize the appropriate solenoids to shift the transmission up or down as required based on information from both the driver and truck

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Transmission ECM provides diagnostic capabilities, stored in onboard memory. Technicians should use the Caterpillar Electronic Technician (Cat ET) for troubleshooting

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Transmission calibration is performed automatically on the CX31 and CX35 transmissions. It is not necessary to manually calibrate the transmission

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Transmission push button shift pad

• Mode switch (1) : Economy mode or standart mode • Arrow keys (2) to limit the maximum transmission upshift speed • LCD screen (3) displays the status of the transmission

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Transmission push button shift pad

• The left digit displays the maximum available gear • The right digit displays the actual gear

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Transmission electronic control component • Transmission ECM (1). • Engine input speed sensor (2) • Output speed sensors (3) • Solenoid valve (4) • Lock up solenoid valve (5) • Filter bypass pressure sensor (6) • Torque converter output shaft speed sensor (7)

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Transmission electronic control component • Torque converter oil temperature sensor (1) • Transmission filter bypass switch (2) • Transmission oil level sensor (3) • Transmission oil temperature sensor (4)

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ECPC system operation

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ECPC system operation

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ECPC system operation

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Transmission Pressure Check

• Main relief pressure tap (1) TCL017 Engineering Drawings

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Transmission Pressure Check • Cap (2) • The torque converter outlet relief valve pressure tap (3) • Cap (4) • Cooler inlet pressure tap (5) • Torque converter inlet pressure tap (6) TCL017 Engineering Drawings

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Transmission Test Port Location 1. TC outlet temp (ET) 2. Filter inlet pressure 3. Main relief pressure 4. TC inlet pressure 5. TC outlet pressure 6. Cooler inlet pressure 7. Lube pressure location 8. Lockup Clutch 9. Clutch 1 ECPC 10. Clutch 2 ECPC 11. Clutch 3 ECPC 12. Clutch 4 ECPC 13. Clutch 5 ECPC

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CX31 Transmission Test Chart 50C (122F) sump

80C (176F) sump

rpm

rpm

Port Location

600 Actual

1400 Actual

2100 Actual

Spec

600 Actual

90C+ (194F+) sump rpm

1400 Actual

2100 Actual

600 Actual

1400 2100 Actual Actual

1. TC outlet temp (ET) 2. Filter inlet pressure

2140 – 138 kPa (310 – 20 psi)

3. Main relief pressure

2415 kPa (330 psi)

4. TC inlet pressure

1034 kPa (150 psi)

5. TC outlet pressure

275 kPa (40 psi)

6. Cooler inlet pressure 7. Lube pressure location

2140 – 138 kPa (310 – 20 psi)

8. Lockup Clutch 9. Clutch 1 ECPC 10. Clutch 2 ECPC 11. Clutch 3 ECPC 12. Clutch 4 ECPC 13. Clutch 5 ECPC

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Always use the latest service information to ensure that the most current specifications and test procedures are used

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PREVENTIVE MAINTENANCE

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Transmission Oil The CX Series of on-highway transmissions are designed to operate with ATF fluids that meet Caterpillar AT-1 or Dexron® IIIH specifications. Cat ATF-HD, a new automatic transmission fluid This fluid has been tested and approved by Caterpillar for use with the Cat® CX28, CX31 and CX35 transmissions

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Transmission Oil Capacities (Refill)

Transmission Type Estimated Initial Fill

Service Refill

CX31 Shallow Sump

38 L (10 US gal)

20 L (5.3 US gal)

CX31 Standard Sump

45 L (12 US gal)

25 L (6.5 US gal)

CX31 with Retarder

49 L (13 US gal)

27 L (7 US gal)

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Daily

• Transmission Oil Level - Check

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Initial 200 Hours/8000 Km/5000 Miles

• Oil Filter (Transmission) - Replace

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500 Hours / 6 Months / 20 000 Km / 12 000 Miles • • • •

Magnetic Screen (Transmission) - Clean Oil Filter (Transmission) – Replace Transmission Oil - Change Transmission Oil Sample - Obtain

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1000 Hours /1 Year / 40 000 Km / 25 000 Miles • • • •

Magnetic Screen (Transmission) – Clean Oil Filter (Transmission) – Replace Transmission Oil - Change Transmission Oil Sample - Obtain

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2000 Hours / 2 Years / 80 000 Km / 50 000 Miles in General Applications • Oil Filter (Transmission) – Replace • Transmission Oil Sample - Obtain

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2000 Hours / 2 Years / 80 000 Km / 50 000 Miles in Severe Applications • • • •

Magnetic Screen (Transmission) - Clean Oil Filter (Transmission) - Replace Transmission Oil - Change Transmission Oil Sample - Obtain

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3000 Hours / 3 Years / 120 000 Km / 75 000 Miles in General Applications • Oil Filter (Transmission) – Replace • Transmission Oil Sample - Obtain

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3000 Service Hours or 3 Years or 120 000 Kilometers (75 000 Miles) in Severe Applications • • • •

Magnetic Screen (Transmission) - Clean Oil Filter (Transmission) – Replace Transmission Oil - Change Transmission Oil Sample - Obtain

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4000 Hours / 4 Years / 240 000 Km / 50 000 Miles in General Applications • • • •

Magnetic Screen (Transmission) - Clean Oil Filter (Transmission) – Replace Transmission Oil - Change Transmission Oil Sample - Obtain

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Transmission Oil Level - Check • • • • •

Warmed to operating temperature Engine LOW IDLE Transmission NEUTRAL Vehicle in level ground Check level at dipstick in filler tube (#1)

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Oil Filter (Transmission) - Replace • Remove filter drain plug (3), drain • Install drain plug, tighten 18 ± 3.5 Nm (13 ± 3 lb ft) • Remove oil filter housing (1) • Discard the used oil filter element • Inspect the seal in the housing • Install the new oil filter element • Install housing (2) & the new element into filter base (1) • Tighten 55 ± 5 N·m (41 ± 4 lb ft)

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Magnetic Screen (Transmission) - Clean

• Remove drain plug (1) • Install, torque 35 ± 10 N·m (26 ± 7 lb ft)

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Magnetic Screen (Transmission) - Clean • Remove 3 bolts for access plate (2) • Remove suction screen & magnetic filter inside • Inspect & Clean, use stiff bristle brush • Install magnetic filter, suction screen • Install access plate, tighten 28 ± 7 N·m (21 ± 5 lb ft) TCL017 Engineering Drawings

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Transmission Oil - Change • Perform magnetic screen cleaning procedure • Fill transmission case with oil through filler tube, refer to refill capacity • Vehicle on level ground • Transmission is in NEUTRAL • Engine at LOW IDLE • Check oil level on dipstick 47

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Transmission Oil Sample - Obtain

• Run engine until reach operating temperature • Take oil sample from sampling valve (1)

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