THERMOWELL 3801092 - Caterpillar

Note: This procedure should be performed at the initial delivery in order to establish a baseline. Also, perform this procedure again after any of the brakes are rebuilt. Rebuilding the brakes will change the piston travel and will create a benchmark for the piston travel. Record the measurements in the Testing and Adjusting, "Worksheets" located in the back of this book.
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Typical view of the front brake housing (S) Purge valve for service brake (P) Purge valve for parking brake
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Typical view of the rear brake housing (S) Purge valve for service brake (P) Purge valve for parking brakeNote: Identification letters are embossed on the purge valves at the top of the brake housing. The purge valve for the parking brake is marked with a "P". The purge valve for the service brake is marked with an "S".Note: Before checking for wear, perform the Systems Operation/Testing and Adjusting, "Service Brakes and Retarder System Pressure - Test".
Personal injury or death can result from machine movement.Place blocks in front of and behind the wheels to make sure the machine does not move while the parking brakes are disengaged.
Personal injury can result from hydraulic oil under pressure.Hydraulic oil under pressure can cause injury to persons on or near the machine when the pressure is suddenly released.At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns.Remove the fill plug only when the engine is stopped, and the fill plug is cool enough to touch with your bare hand.Do not allow hot oil or components to contact skin.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Installing and Setting the Brake Wear Indicator
While the engine is off and the parking brake is engaged, remove the top plug that has the label "S".
Install the brake wear indicator into the open port. Tighten the brake wear indicator to a torque of 140 14 N m (105 10 lb ft).Note: The 348-8577 Brake Wear Indicator Gp is for the front wheels, and the 348-8579 Brake Wear Indicator Gp is for the rear wheels.
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Typical view of an installed brake wear indicator
Remove cap (A) from the brake wear indicator.
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Typical view of newly installed brake discs
Apply forward pressure to indicator rod (B) so that the indicator rod contacts brake piston (C) .
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Push dowel bushing (D) into the body until the end of dowel bushing (D) is flush with the notched shoulder that is on indicator rod (B) .
Reinstall cap (A) that was removed in Step 3. Tighten cap (A) to a torque of 34 4 N m (300 35 lb in).Checking the Brake Wear
Illustration