3
3. BRAKE MASTER CYLINDERS .................................................................................................................... 8
3.1 BRAKE RESERVOIR........................................................................................................................... 13
3.2 BRAKE BLEEDING PROCEDURE...................................................................................................... 13
SECTION 35 - HYDRAULIC SYSTEM
1. HYDRAULIC DIAGRAMS ............................................................................................................................. 3
1.1 HYDRAULIC DIAGRAM - 2WS MECHANICAL MODELS..................................................................... 3
1.2 HYDRAULIC DIAGRAM - 2WS PILOT MODELS.................................................................................. 5
1.3 HYDRAULIC DIAGRAM - 4WS MECHANICAL MODELS..................................................................... 7
1.4 HYDRAULIC DIAGRAM - 4WS PILOT MODELS.................................................................................. 9
2. HYDRAULIC PUMP.................................................................................................................................... 11
2.1 DESCRIPTION AND OPERATION...................................................................................................... 11
2.2 TECHNICAL SPECIFICATIONS.......................................................................................................... 11
2.3 LOAD SENSING VALVE ..................................................................................................................... 13
2.4 REMOVAL ........................................................................................................................................... 15
2.5 COMPONENTS ................................................................................................................................... 16
2.6 DISASSEMBLY AND ASSEMBLY....................................................................................................... 17
3. CONTROL VALVES ................................................................................................................................... 21
3.1 CONTROL VALVES “HUSCO” (B110 MECHANICAL MODELS) ....................................................... 21
3.2 CONTROL VALVES “REXROTH” (B115 MECHANICAL MODELS)................................................... 58
3.3 CONTROL VALVES “REXROTH” (B110 - B115 PILOT MODELS) .................................................... 74
3.4 SOLENOID VALVE FOR PILOTING THE BACKHOE CONTROL VALVE
(WITH HYDRAULIC CONTROL)......................................................................................................... 82
3.5 ACCUMULATOR GLIDE RIDE “PARKER”.......................................................................................... 85
3.6 CIRCUIT RELIEF VALVES.................................................................................................................. 88
4. HYDRAULIC SWING SYSTEM .................................................................................................................. 98
4.1 DESCRIPTION AND OPERATION...................................................................................................... 98
4.2 HYDRAULIC OIL FLOW...................................................................................................................... 99
4.3 PRECISION SWING CONTROL ....................................................................................................... 101
5. HYDRAULIC CYLINDERS........................................................................................................................ 104
5.1 LOADER CYLINDER ......................................................................................................................... 105
5.2 LOADER BUCKET CYLINDER ......................................................................................................... 111
5.3 4X1 BUCKET CYLINDER.................................................................................................................. 117
5.4 BACKHOE BOOM CYLINDER .......................................................................................................... 120
5.5 BACKHOE CROWD CYLINDER ....................................................................................................... 124
5.6 BACKHOE BUCKET CYLINDER....................................................................................................... 128
5.7 SHORT AND LONG TELESCOPIC CYLINDER................................................................................ 132
5.8 STABILIZERS CYLINDER................................................................................................................. 136
5.9 SWING CYLINDER............................................................................................................................ 140
5.10 SPECIAL TOOLS............................................................................................................................. 144
6. PILOT HYDRAULIC CONTROL LEVERS ................................................................................................ 145
6.1 TECHNICAL SPECIFICATIONS........................................................................................................ 145
6.2 DESCRIPTION AND OPERATION.................................................................................................... 146
6.3 DISASSEMBLY AND ASSEMBLY..................................................................................................... 149
6.4 PILOT HYDRAULIC CONTROL VALVE............................................................................................ 152
7. FAULT FINDING AND FLOW TESTING .................................................................................................. 155
7.1 PRELIMINARY CHECKS................................................................................................................... 155
7.2 FAULT FINDING (WITH “HUSCO” CONTROL VALVES) ................................................................. 156
7.3 PRESSURE TESTING (WITH “HUSCO” CONTROL VALVES) ........................................................ 161
7.4 FAULT FINDING (WITH “REXROTH” CONTROL VALVES)............................................................. 169
