631K OEM Wheel Tractor Machine Systems Caterpillar

Service Brake System Pressure - Test

Usage:

631K WT6

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

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Personal injury can result if the machine moves while testing.

If the machine begins to move during test, reduce the engine speed immediately and engage the parking brake.

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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.

To prevent possible injury, perform the procedure that follows before testing and adjusting the brake system.

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NOTICE

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.

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Table 1
Service Brake System Pressure - Test (Front wheels)
Date	Equipment ID Code
Description	Specification	Actual
Front Brakes	5862 ± 690 kPa (850 ± 100 psi)
Maximum Pressure 5 seconds after brakes released	140 kPa (20 psi)

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Table 2
Service Brake System Pressure - Test (Rear Wheels)
Date	Equipment ID Code
Description	Specification	Actual
Rear Brakes	5690 ± 690 kPa (825 ± 100 psi)
Maximum Pressure 5 seconds after brakes released	140 kPa (20 psi)

This procedure will check the service brake pressure at the front and rear wheels.

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Table 3
Tool	Item	Part Number	Description	Qty
B		198-4240	Digital Pressure Indicator Gp
	B1	198-4234	Digital Indicator	1
	B2	251-9600	Pressure Sensor Gp (0 to 68,900 kPa (0 to 10,000 psi))	2
	B3	198-4236	Adapter Cable As	2

Start the engine. Warm the engine up to normal operating temperature which is 60° C (140° F). Run the engine at low idle.
Depress the service brake pedal and hold the brake pedal in the fully applied position. The brake lamps should be on.
The brake pressure for the front axle should check 5862 ± 690 kPa (850 ± 100 psi).
Release the service brake pedal. The front brake pressure shall be a maximum of 140 kPa (20 psi) within 5 seconds after the service brake pedal has been released.
Remove all test equipment. and reinstall the dust covers.
Reinstall the crankcase guards. Reinstall the crank case guards. For information regarding the installation of the crankcase guards refer to the Disassembly and Assembly, "Crankcase Guard - Remove and Install - Tractor" for your machine.

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Illustration 5	g03720614
Typical example. 637K with the ejector in theFORWARD position. The picture is taken from between the bowl and the rear tire.

Start the engine and move the ejector to the forward position.
Shut off the engine.
Connect tooling (B) to (2) to check the rear service brakes.
Start the engine and allow the engine to warm up to normal operating temperature. Run the engine at low idle.
Depress the service brake pedal and hold the brake pedal in the fully applied position. The brake lamps should be on.
The brake pressure for the rear axle should check 5690 ± 690 kPa (825 ± 100 psi).
Release the service brake pedal. The rear brake pressure shall be a maximum of 140 kPa (20 psi) within 5 seconds after the service brake pedal has been released.
Remove all test equipment and install dust covers.
Reinstall the crank case guards. For information regarding the installation of the crankcase guards refer to the Disassembly and Assembly, "Crankcase Guard - Remove and Install - Tractor" for your machine.

Check accumulator pre-charges by referring to Test and Adjust, "Brake Accumulator (Service) - Test and Charge" in this manual.
Purge brakes thoroughly. Refer to Test and Adjust, "Parking Brake Purge Procedure" in this manual.
Check the accumulator pressures. Refer to the Test and Adjust, "Test and Adjust- Brake Accumulator Charging Valve-Test".
Inspect brake pedal located in the cab.