Hydraulic System Fault Finding; Introduction - jcb JS300 Service Manual

Section E - Hydraulics

Hydraulic System Fault Finding

Introduction

Hydraulic System Fault Finding
Introduction
This topic contains information about a machine SYSTEM. The system has some devices that connect either
mechanically, hydraulically or electrically. Make sure you are referring to the correct system. Refer to the applications
K Related Topics ( T
table. E-234).
Descriptions and procedures relate to the system and not the individual devices. For information about the devices refer
K Related Topics ( T E-234)
to the relevant topics.
For information about related electrical and electronic devices refer to Section M.
This topic is intended to help you understand what the system does and how it works. Where applicable it also includes
procedures such as removal and replacement and dismantle and assemble.
K Related Topics ( T E-234)
K Hydraulic Contamination ( T E-235)
K Main Control Valve ( T E-237)
K Relief Valve ( T E-238)
K Hydraulic System ( T E-239)
K Slew Motor ( T E-240)
K Hydraulic Pump ( T E-242)
K Hydraulic Rams ( T E-243)
K Fault Finding Tests ( T E-248)
K Test 001: Testing Negative Control Signal ( T E-250)
K Test 002: Test Max Flow Signal ( T E-252)
K Test 003: Testing Main Pump Pressure ( T E-253)
K Test 004: Testing Horsepower Control ( T E-255)
K Test 005: Checking the Operation of the Main Hydraulic Spool ( T E-256)
K Test 006: Test the Pressure Switches ( T E-258)
K Test 007: Testing Engine Speed Settings ( T E-259)
K Test 008: Testing Machine Cycle Times ( T E-260)
K Test 011: Testing Swing Brake Pressure ( T E-264)
K Test 012: Testing Track Motor Relief Valve Settings ( T E-265)
K Test 013: Testing Track Motor Drain Line Flow Rate ( T E-266)
K Test 014: Testing the High Speed Tracking Setting ( T E-267)
K Test 015: Testing the Low Speed Tracking Setting ( T E-268)
K Test 016 - Flow Testing Hydraulic Pumps - Record Sheet ( T E-269)
K Test 017: Testing Swing Bearing ( T E-270)
K Ram Creep Tests - All Services ( T E-273)
E-233 9813/5100-1 E-233