980M and 982M Wheel Loaders Power Train, Steering, Braking, Hydraulic, and Machine Systems Caterpillar

Service Brake System Pressure - Test

Usage:

982M F9A

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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
980M/982M Service Brake Pressure
Pump Pressure	Setting	Actual
Rear Service Brake Pressure	5510 + 420 - 170 kPa (799.2 +61 -25 psi)
Front Service Brake Pressure	5407 +520 - 207 kPa (784 +75 - 30 psi)

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	g03116679
Steering frame in locked position

Move steering frame lock to the LOCKED position.

Test Procedure

Stop the engine. Place the transmission direction selector in the NEUTRAL position.
Engage the parking brake.
Depress the brake pedal repeatedly in order to release all oil pressure from the brake circuit.
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Illustration 2 g03116818

Location of Brake Control Valve on left side of machine under the cab.

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Illustration 3 g03116876

Brake Control Valve
(1) Test port for front service brakes
(2) Test port for rear service brakes
Remove the protective cap from test port (2) in order to test the oil pressure of the rear service brakes. Install a 0 to 16000 kPa (0 to 2300 psi) pressure gauge.
Look at the pressure gauge. Before you start 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 the value shown in Table 1.
If the brake pressure is not in the correct range but the brake accumulator charging valve is functioning correctly, replace the brake control valve.
Repeat this procedure at test port (1) in order to test the oil pressure of the front service brakes.