789C Prueba de Calado Convertidor

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Producto: TRUCK

Modelo: 789C TRUCK 2BW

Configuración: 789C Truck 3516 Engine 2BW00001-UP (MACHINE)

Pruebas y Ajustes789C Off-Highway Truck Power TrainNúmero de medio -SENR1523-05 Fecha de publicación -01/12/2009 Fecha de actualización -17/12/2009

i05028790

Relief Valve (Torque Converter Outlet) Pressure - Test and

Adjust

SMCS - 3133; 3182

Tools Needed

Part Number Part Description Qty

9U-7400 Multitach Tool Group 1

177-7862 Hose Assembly 1

8T-0854 Pressure Gauge 0 to 1000 kPa (0 to 150 psi)

1

Table 1

Personal injury or death can result from sudden machine movement.

Sudden movement of the machine or release of air pressure or oil

pressure can cause injury to persons on or near the machine.

To help prevent possible injury before testing and adjusting any air

system or hydraulic system, perform the procedure in the Testing and

Adjusting, "General Information" section.

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Illustration 1 g00376933

(1) Torque converter outlet relief valve

(AA) Pressure tap for torque converter outlet pressure

This test will show the following conditions if the conditions exist:

The torque converter operates correctly.•

Torque converter outlet relief valve (1) is correctly set.•

Procedure

Install the 9U-7400 Multitach on the engine. The 9U-7400 Multitach can measure the engine rpm by using either the photo pickup and reflective tape, a magnetic pickup, or a tachometergenerator.

1.

Note: The Electronic Control Analyzer Programmer (ECAP) or the Electronic Technician (ET) can be used instead of the multitach.

At pressure tap (AA) , connect 177-7862 Hose Assembly to the nipple. Connect a 8T-0854

Pressure Gauge (1000 kPa (145 psi)) to the hose.2.

Start the engine. Run the engine at the low idle rpm in NEUTRAL.3.

The drive wheels must not turn during a stall test. Be certain that the air pressure is at the normal pressure for operation. Engage the parking brakes and the service brakes.

4.

Note: If the brakes do not keep the machine from moving, put the machine against a solid object that will not move.

Be certain that the oil is at 82° to 138°C (180° to 250°F).5.

Move the transmission control to the First position.6.

Slowly increase the engine rpm to the maximum governor setting. The machine will try to move.

7.



The engine rpm must be 1715 ± 65 rpm with the torque converter in a stall condition.8.

The pressure on the gauge must be 345 to 552 kPa (50 to 80 psi).9.

NOTICE

Do not keep the torque converter in a stall condition for long periods of time. Damage could occur in the torque converter, the engine, and the

brakes.

When this test is complete, put the transmission control in NEUTRAL. Stop the engine. Remove the test equipment.

10.

Problem: The engine speeds are out of specification.

Probable Cause


Engine information plate

The specifications may have changed. Refer to the engine information plate in order to see the performance specification for the engine. Refer to Microfiche, SBFY1109, "Fuel Setting" in order to verify the specifications for the engine speeds.

•

Refer to the engine system Troubleshooting, SENR1128, "P-312 Can Not Reach Top Engine RPM" for problems that involve the engine.

•

The torque converter failed.•



The engine has too much power.•

Problem: The torque converter outlet pressure is too low, and

the oil gets too hot during normal operation.

Probable Cause

Perform the test in the Testing and Adjusting, "Relief Valve (Torque Converter Inlet) Pressure - Testand Adjust".

Problem: The torque converter outlet pressure is too low.

Probable Cause

Perform the test in the Testing and Adjusting, "Relief Valve (Torque Converter Inlet) Pressure - Testand Adjust".


(1) Outlet relief valve

(2) Spacers

Chart of Spacers for the Outlet Relief Valve (1)

Pt. No. for Spacer Thickness Change in Pressure

Table 2



5M-9624 Spacer0.25 mm (.010 inch) 5 kPa (0.73 psi)

5M-9623 Spacer0.90 mm (.035 inch) 18 kPa (2.6 psi)

( 1 ) Before an adjustment is made, be certain that the valve spring is not weak or broken.

Problem: The torque converter outlet pressure is too high, and the oil temperature is not too hot.

Probable Cause

The setting of the outlet relief valve is too high. Remove spacers (2) . Refer to Table 2.

Problem: The torque converter outlet pressure is correct, and

the oil gets too hot during normal operation.

Probable Cause

Refer to the Testing and Adjusting, "Brake Oil Overheating Troubleshooting".

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Wed Nov 28 10:25:12 UTC-0400 2012



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