GEAR-SUN 6Y4714 - Caterpillar

The transmission pressure taps are located on the right side of the transmission.
Illustration 2 g01384473
Pressure tap (10) Torque converter lockup clutch pressure tapThe pressure tap for the torque converter lockup clutch is located on the left side of the torque converter housing.
Illustration 3 g01384475
Pressure tap (11) Transmission lube pressure tapThe transmission lube pressure tap is located on the left side of the transmissionTest for the Transmission Clutch Pressure
Connect the hose assembly from the 198-4240 Digital Pressure Indicator onto pressure tap (4). With the transmission control lever in the NEUTRAL position. Start the engine and operate the engine at low idle. Record the pressure. Stop the engine.
Connect the pressure gauge to pressure tap (8) for the transmission charge pressure. With the transmission control lever in the NEUTRAL position. Start the engine and operate the engine at low idle. Record the pressure.
Connect the pressure gauge to pressure tap (9) for the torque converter inlet pressure. Record the pressure.
With the transmission control lever in the NEUTRAL position, connect the pressure gauge to pressure tap (1). Release the parking brake and apply the service brakes. Move the transmission control lever to the FIRST gear position. Record the pressure. Place the transmission control lever in the NEUTRAL position. Apply parking brake and release service brakes.
With the transmission control lever in the NEUTRAL position, connect the pressure gauge to pressure tap (6). Release the parking brake and apply the service brakes. Move the transmission control lever to the FIRST gear position. Record the pressure. Place the transmission control lever in the NEUTRAL position. Apply parking brake and release service brakes.
With the transmission control lever in the NEUTRAL position, connect the pressure gauge to pressure tap (7). Release the parking brake and apply the service brakes. Move the transmission control lever to the REVERSE gear position. Record the pressure. Place the transmission control lever in the NEUTRAL position. Apply parking brake and release service brakes.
Remove all measuring tools and replace all the caps on the test ports.If a pressure rise is noted, the solenoid and the related electrical circuit are functioning.If a pressure rise is not noted, the problem could be:
Bent solenoid stem
Dirty or plugged screen
Weak or broken spring
Or a problem in the electrical circuitReferenceFor more information, refer to System Operation, Troubleshooting, Testing, and Adjusting, Power Train Electronic Control System, "Transmission Clutch - Calibrate".Adjustments for the Transmission Clutch Pressure
If the pressure reading for each energized clutch is not within the values in Table 2:
The transmission hydraulic control modulating valve could need replacing
Pump pressure needs adjustingReferenceFor more information, refer to System Operation, Troubleshooting, Testing, and Adjusting, Power Train Electronic Control System, "Transmission Clutch - Calibrate".Adjustment for the Transmission Charging Pump Pressure
The transmission hydraulic control relief valve is located under the cover on the transmission.
Illustration 4 g01261968
Transmission hydraulic control relief valve (A) Cover
Illustration 5 g01261970
Transmission hydraulic control relief valve (B) Adjustment screwCheck the transmission charge pump pressure at pressure tap (8). If not within the values in Table 2, adjust the spring of the transmission hydraulic control relief valve.Use the following