Ajuste De De Interrruptor De La Transmision 938g

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Testing and Adjusting 938G Wheel Loader and IT38G Integrated Toolcarrier Braking System Media Number -SENR6793-01

Publication Date -01/05/1998

Date Updated -09/10/2001

i00895461

Brake System Air - Purge SMCS - 4250-542

Personal injury or death can result if two persons are not used in the following procedure.

NOTICE Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

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Illustration 1

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Top View of Front Axle Housing (1) Air purge screws.

Illustration 2

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Top View of Right Rear Axle Housing (2) Air purge screw.

The four air purge screws for the service brakes are located on the top of the corresponding axle housing. Note: Perform this procedure for one service brake at a time. 1. Check the hydraulic tank oil level. Make sure that you maintain the correct oil level in the hydraulic oil tank throughout the air removal procedure.

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2. Start the engine. Allow the oil pressure to increase to the cut-out pressure. Then, stop the engine. 3. Fasten one end of a transparent tube that is 6.4 mm (.25 inch) in diameter to an air purge screw. Put the other end of the tube into a suitable container for collecting the hydraulic oil. Loosen the air purge screw. 4. The operator should slowly depress the brake pedal. Hold the brake pedal in this position throughout Step 5 . 5. As the hydraulic oil flows through the tube, look for air bubbles in the oil. Allow the oil to flow into the container until no air bubbles are visible. Then, tighten the air purge screw. Release the brake pedal. 6. Perform this procedure for each of the other service brakes. Make sure that you tighten each air purge screw. 7. Fill the hydraulic oil tank, if necessary. Note: If the brake pedal is spongy during the first hours of operation, perform this procedure again. Copyright 1993 - 2019 Caterpillar Inc. All Rights Reserved.

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