120M, 12M, 140, 140M, 150, 14M, 160M, 160 and 16M Motor Graders Secondary Steering System Relief Valve (Secondary Steering)

Relief Valve (Secondary Steering) - Test

120M, 12M, 140, 140M, 150, 14M, 160M, 160 and 16M Motor Graders Secondary Steering System [RENR8472]

120M, 12M, 140, 140M, 150, 14M, 160M, 160 and 16M Motor Graders Secondary Steering System Operational Checks

120M, 12M, 140, 140M, 150, 14M, 160M, 160 and 16M Motor Graders Secondary Steering System Pressure Sensor (Secondary Steering)

HYDRAULIC SYSTEM

VALVE GP

120M, 12M, 140, 140M, 150, 14M, 160M, 160 and 16M Motor Graders Secondary Steering System Relief Valve (Secondary Steering) - Test

1.1. Specification

2.1. Introduction

3.1. Required Tools

4.1. Test Preparation

5.1. Test Procedure

Note: To reduce the risk of injuries due to tests/adjusts performed on the equipment with the engine running, use a remote pressure reading with a wireless gauge or add long hoses/wires to keep all personnel away from the machine while the engine is running.

Reference: Before you perform any tests, refer to the Testing and Adjusting, "Machine Preparation for Troubleshooting" section.

Specification

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Table 1
Relief Valve Pressure Setting
17225 kPa (2500 psi)

Introduction

The following procedure will explain the steps for testing the secondary steering relief valve.

Required Tools

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Illustration 1	g02144709
Tooling (A)

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Illustration 2	g02144716
Tooling (B)

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Table 2
Tool	Item	Part Number	Description	Qty
A	A1	8T-0859	Pressure Gauge (0 to 25,000 kPa (0 to 3,600 psi))	1
	A2	6V-3989	Fitting	1
	A3	6V-4143	Quick Connect Coupler	2
	A4	177-7862	Hose As (5.5 m (18 ft))	1
B		198-4240	Digital Pressure Indicator Gp	1
	B1	198-4234	Digital Indicator	1
	B2	198-4238	Pressure Sensor Gp (0 to 34,450 kPa (0 to 5,000 psi))	1
	B3	198-4236	Adapter Cable As	1
F		110-2218	Swivel Tee	1
		5P-6944	Adapter	1
		6V-3965	Fitting	1

Note: Tooling (A) or Tooling (B) may be used to perform these tests.

Test Preparation

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Illustration 3	g01375996
(1) Relief valve

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Illustration 4	g01375993
(2) Secondary steering pump (3) Line

With the engine off, disconnect line (3) from secondary steering pump (2).
Install Tooling (F) to secondary steering pump (2) and connect line (3) to tooling (F).
Install Tooling (B) to Tooling (F).

Test Procedure

Turn both the battery disconnect switch and the engine start switch to the ON position. Start the engine and run the engine. Turn the implement lockout switch to the ON position.
Hold the secondary steering test switch in the TEST position until the pressure stops rising. The pressure should be 17225 kPa (2500 psi). 17225 kPa (2500 psi) is the correct pressure setting for relief valve (1).
If the pressure reading for relief valve (1) is not 17225 kPa (2500 psi), relief valve (1) must be replaced. Relief valve (1) cannot be adjusted. If the pressure reading is incorrect, replace relief valve (1) and repeat Step 2. If the pressure reading for relief valve (1) is correct, remove Tooling (F) and Tooling (B) and reconnect line (3) to secondary steering pump (2).