jcb JS300 Service Manual page 659

Contents
Swing Gearbox
Introduction ........................................................................................... E-150
Related Topics ...................................................................................... E-151
Reduction Gear Structure and Working Principles ............................... E-152
Dismantling and Assembly ................................................................... E-153
Rotary Coupling
Introduction ........................................................................................... E-170
Operation .............................................................................................. E-171
Removal and Replacement .................................................................. E-172
Dismantling ........................................................................................... E-174
Assembly .............................................................................................. E-177
Hydraulic Rams
Introduction ........................................................................................... E-181
Related Topics ...................................................................................... E-182
Precautions During Use ........................................................................ E-183
Removal and Replacement .................................................................. E-185
Dismantling and Assembly ................................................................... E-203
Maintenance Specifications .................................................................. E-215
Shuttle Valve
Introduction ........................................................................................... E-217
Related Topics ...................................................................................... E-218
Removal and Replacement .................................................................. E-219
Dismantling and Assembly ................................................................... E-220
Cushion Valve
Introduction ........................................................................................... E-223
Related Topics ...................................................................................... E-224
Operation .............................................................................................. E-225
Removal and Replacement .................................................................. E-230
Dismantling and Assembly ................................................................... E-231
Hydraulic System Fault Finding
Introduction ........................................................................................... E-233
Related Topics ...................................................................................... E-234
Hydraulic Contamination ...................................................................... E-235
Main Control Valve ............................................................................... E-237
Relief Valve ........................................................................................... E-238
Hydraulic System .................................................................................. E-239
Slew Motor ............................................................................................ E-240
Hydraulic Pump .................................................................................... E-242
Hydraulic Rams .................................................................................... E-243
Fault Finding Tests ............................................................................... E-248
Test 001: Testing Negative Control Signal ............................................ E-250
Test 002: Test Max Flow Signal ............................................................ E-252
Test 003: Testing Main Pump Pressure ................................................ E-253
Test 004: Testing Horsepower Control .................................................. E-255
Test 005: Checking the Operation of the Main Hydraulic Spool ........... E-256
Test 006: Test the Pressure Switches ................................................... E-258
Test 007: Testing Engine Speed Settings ............................................. E-259
Test 008: Testing Machine Cycle Times ............................................... E-260
Test 011: Testing Swing Brake Pressure .............................................. E-264
Test 012: Testing Track Motor Relief Valve Settings ............................. E-265
E-ii
Section E - Hydraulics
Page No.
E-ii