950 GC Wheel Loader Braking and Hydraulic Fan System Caterpillar

Service Brake System Pressure - Test

Usage:

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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

Always use a board or cardboard when checking for a leak.

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

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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.

Specifications

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Table 1
950 GC Service Brake Pressure
Date	Equipment ID Code
Pump Pressure	Setting	Actual
Service Brake Valve⁽¹⁾	4690 ± 350 kPa (680 ± 50 psi)

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⁽¹⁾	For both Front and Rear Brakes

Introduction

This information includes the following test:

Service Brake System

This information includes the following adjustment:

Service Brake System

Required Tools

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Table 2
Required Tools
Part Number	Description
8T-0858	Pressure Gauge (0 TO 16,000-KPA (0 TO 2,300-PSI))

Test Preparation

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Illustration 1	g03731188
Steering Frame in the locked position

Move steering frame lock to the LOCKED position.

Stop the engine. Engage the parking brake.
Depress the brake pedal repeatedly in order to release all oil pressure from the brake circuit.

Testing Procedure

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Illustration 2	g03519316
Brake Control Valve (1) Test port for the rear service brakes. (2) Test port for the front service brakes.

Remove the protective cap from test port (1) in order to test the oil pressure of the rear service brakes. Install a 0 to 15850 kPa (0 to 2300 psi) pressure gauge.
Look at the pressure gauge. Before starting the engine, the oil pressure must be at the pressure of the hydraulic oil tank.
Start the engine and allow the hydraulic oil to reach normal operating temperature and normal operating pressure.
Hold down the brake pedal and look at the pressure gauge. The brake pressure should be at 4690 ± 350 kPa (680 ± 50 psi).
If the brake pressure is not in the correct range but the control manifold is functioning correctly, replace the brake control valve.
Repeat this procedure at test port (2) in order to test the oil pressure of the front service brakes.