Calibracion y Testeo Transmision 797F

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Pruebas y Ajustes 797F Off-Highway Truck Pow er Train

Transmission - Test

SMCS - 3060-081-HR

The following procedure is for checking the transmission.

Create a Test Group on Caterpillar Electronic Technician (ET)

1. On the ET screen toolbar, click File - Select ECM, and choose Transmission ECM.

2. In the status group, create a new group name entitled "797 Transmission Test".

3. Select the items on the ET screen above, as shown in Illustration 1.

Cerrar SIS

Pantalla anterior

Producto: TRUCKModelo: 797F TRUCK LAJConfiguración: 797F Off-Highway Truck LAJ00001-UP (MACHINE)

POWERED BY C175-20 Engine

Número de medio -KENR8371-00 Fecha de publicación -01/10/ 2009 Fecha de actualización -27/10/ 2009

i03683133

Illustration 1 g00948936

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Test 1: Transmission Test

Perform the transmission tests that are listed in Table 1.

1. Run the engine at LOW IDLE and record the data into the chart. Run the engine at HIGH IDLE and recordthe data into the chart.

Table 1

TEST SPECSACTUAL

Transmission Oil Temperature (during tests)

>80 °C (175 °F)

<121 °C (250 °F)

Transmission Charging Filter RestrictionMax restriction

345 ± 21 kPa (50 ± 3 psi)

Low idle:

High idle:

Transmission Charging Pressure (Main Relief)

Low idle

2310 ± 140 kPa (335 ± 20psi)

High idle

2650 ± 140 kPa (385 ± 20psi)

Low idle:

High idle:

Transmission Clutch Latching Pressure (1)

Low idle:

2200 ± 140 kPa (320 ± 20psi)

High idle:

2480 ± 140 kPa (360 ± 20psi)

Low idle:

High idle:

Transmission Lubrication Oil Pressure at Rear TransmissionModule (2)

Low idle

105 ± 35 kPa (15 ± 5 psi)High idle

480 ± 100 kPa (70 ± 15 psi)

Low idle:

High idle:

Transmission Lubrication Oil Pressure at Front TransmissionModule (3)

Low idle

55 kPa to 95 kPa (8 psi to14 psi)

High idle

380 kPa to 550 kPa (55 psito 80 psi)

Low idle:

High idle:

Transmission Lubrication Oil Pressure - Clutch 6 and 7 at

Rear Transmission Module (4)

Low idle

62 ± 14 kPa (9 ± 2 psi)High idle

345 ± 70 kPa (50 ± 10 psi)

Low idle:

High idle:

( 1 ) At pressure tap





Test 2: Transmission Clutch Pressure Test at LOW IDLE

This test is conducted while in CONVERTER DRIVE.

1. Connect 0 to 4135 kPa ((0 to 600 psi)) gauges to the clutches that are being tested. Refer to Table 2.

2. Run the engine at LOW IDLE. Apply the parking brakes and the service brakes when the transmission is in agear.

3. Record the pressures in Table 2.

4. If the clutch pressure is out of specification, proceed to "Test 3: Transmission Clutch Calibrations".

Test 3: Transmission Clutch Calibrations

( 2 ) At sensor location

( 3 ) At front transmission module pressure tap

( 4 ) At bottom of lube valve

Table 2

CLUTCH PRESSURES AT LOW IDLE

CLUTCH CONVERTER DRIVE

ACTUAL GEAR

CLUTCHES ENGAGED

2 1550 ± 140 kPa (225 ± 20 psi)NEUTRAL

2

2 2067 ± 140 kPa (300 ± 20 psi) REVERSE 2 - 7

3 2067 ± 140 kPa (300 ± 20 psi) FIRST 3 - 6

6 (1) 2310 ± 140 kPa (335 ± 20 psi) FIRST 3 - 6

7 (2) 2310 ± 140 kPa (335 ± 20 psi) REVERSE 2 - 7

Transmission Oil Temperature (during tests)>

80 °C (175 °F)

<121 °C (250 °F)

( 1 ) Clutch 6 is limited by pump pressure in CONVERTER DRIVE

( 2 ) Clutch 7 is limited by pump pressure in CONVERTER DRIVE





The following two transmission clutch calibrations can be performed:

Transmission Clutch Engagement Pressure Calibration

Transmission Fill Calibration

Procedure for Transmission Clutch Engagement Pressure Calibration

This test in conducted in DIRECT DRIVE at LOW IDLE

1. Connect 0 to 4135 kPa (0 to 600 psi) gauges to the clutches that are being tested.






2. On the ET screen toolbar, click Service - Calibration - Transmission Clutch Engagement Pressure Calibration.The screen in Illustration 3 will appear.

Note: All of the boxes are selected by default.

3. Unselect the boxes of the clutches that are not being tested.

Note: Leave the box for the "Lockup Clutch Engagement Pressure Calibration" selected at all times.

4. Select the "Begin" button and the screen in Illustration 4 will appear.






Note: The bottom arrow keys are not selectable at this point.

5. When the setup calibration conditions are met, select the "Next" button in order to continue.

6. Observe the pressure gauges of the clutches that are being tested.








10. The screen in Illustration 6 will show whether the calibration was a SUCCESS or was NOT SUCCESSFUL.


Table 3

CLUTCH CALIBRATION PRESSURES AT LOW IDLE

CLUTCH DIRECT DRIVE ACTUAL

11550 ± 140 kPa (225 ± 20 psi)

21550 ± 140 kPa (225 ± 20 psi)

31550 ± 140 kPa (225 ± 20 psi)

41550 ± 140 kPa (225 ± 20 psi)

51550 ± 140 kPa (225 ± 20 psi)

61723 ± 140 kPa (250 ± 20 psi)

72310 ± 140 kPa (335 ± 20 psi)

N/A

Lockup2067 ± 140 kPa (300 ± 20 psi)

Table 4

797B TRANSMISSION GEARS

GEAR CLUTCHES ENGAGED TRAVEL SPEED @ 1900 RPM

NEUTRAL 2 N/A





Procedure for Transmission Fill Calibration

Note: Caterpillar Electronic Technician (ET) conducts this test automatically.

1. On the ET screen toolbar, click Service - Calibration - Transmission Fill Calibration. The screen inIllustration 7 will appear.

2. When the setup calibration conditions are met, select the "Next" button in order to continue.

REVERSE 2 - 711.9 km/h (7.4 mph)

FIRST 3 - 610.5 km/h (6.5 mph)

SECOND 2 - 614.1 km/h (8.7 mph)

THIRD 1 - 619.0 km/h (11.8 mph)

FOURTH 2 - 525.6 km/h (15.9 mph)

FIFTH 1 - 534.4 km/h (21.3 mph)

SIXTH 2 - 446.5 km/h (28.8 mph)

SEVENTH 1 - 4 62.6 km/h (38.9 mph)






3. Engine speed will increase to 1300 RPM. Each individual clutch will be selected for calibration, starting withclutch 1.

Note: One or two clutches will be simultaneously engaged in order to provide a load to the clutch that isbeing calibrated.

4. The clutch that is being calibrated will engage and disengage several times, until the Transmission ECM is

satisfied that the clutch fill calibration is complete.

5. The calibration process will continue until all of the clutches have been calibrated, or until the user aborts bychoosing the "Cancel" button.

Note: The transmission fill calibration procedure will abort automatically if any of the setup calibrationconditions are changed, or go out of range.

The transmission fill calibration procedure will take between 30 to 45 minutes in order to complete (approximately4 minutes per clutch).

Copyright 1993 - 2010 Caterpillar Inc.Todos los derechos reservados.Red privada para licenciados del SIS.

Sat Aug 21 16:36:31 UTC-0400 2010

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Calibracion y Testeo Transmision 797F