Maeda MK0003, Service Manual, Page: 4 / 348

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5.2 APPEARANCE AND SPECIFICATIONS (STANDARD PUMP) 2-52
5.3 INTERNAL STRUCTURE 2-53
5.4 OPERATING PRINCIPLES 2-54
5.5 FAILURE CAUSE AND COUNTERMEASURE 2-56
6. TRAVEL CONTROL VALVE 2-57
6.1 APPEARANCE AND SPECIFICATIONS 2-57
6.2 INTERNAL STRUCTURE 2-58
6.3 INSPECTION AND ADJUSTMENT 2-59
6.4 FAILURE CAUSE AND COUNTERMEASURE 2-60
7. TRAVELING MOTOR 2-61
7.1 APPEARANCE AND SPECIFICATIONS 2-61
7.2 INTERNAL STRUCTURE 2-62
7.3 OPERATING PRINCIPLES 2-63
7.4 OPERATING PRINCIPLES 2-64
7.4.1 REDUCER 2-64
7.4.2 HYDRAULIC MOTOR 2-65
7.4.3 HYDRAULIC VALVE (COUNTER-BALANCE VALVE) 2-66
7.4.4 PARKING BRAKE 2-67
7.5 PRECAUTIONS FOR USE 2-68
7.6 FAILURES AND COUNTERMEASURES 2-70
8. CRANE CONTROL VALVE 2-71
8.1 OUTSIDE DRAWING 2-71
8.2 OVERVIEW 2-72
8.3 HYDRAULIC CIRCUIT DIAGRAM 2-73
8.4 ACTIONS OF EACH SECTION 2-74
8.5 FAILURE CAUSE AND COUNTERMEASURE 2-81
9. OUTRIGGER SELECT VALVE 2-82
9.1 APPEARANCE AND SPECIFICATIONS 2-82
9.2 INTERNAL STRUCTURE 2-84
9.3 INSPECTION OF VALVES 2-85
9.4 METHODS FOR OPERATION ADJUSTMENT 2-86
9.5 OUTRIGGER CHANGE-OVER SWITCH 2-87
10. ROTARY JOINT 2-88
10.1 APPEARANCE AND SPECIFICATIONS 2-88
10.2 INTERNAL STRUCTURE 2-90
10.3 ROTARY BRUSH 2-91
11. HOOK 2-97
11.1 INSPECTION OF HOOK 2-97
12. BOOM 2-98
12.1 MAIN BOOM 2-98
12.2 JIB 2-101
12.3 JIB HEAD 2-103
13. TELESCOPIC AND DERRICK CYLINDERS 2-104
13.1 MAIN TELESCOPIC CYLINDER 2-104
13.2 JIB TELESCOPIC CYLINDER 2-106
13.2.1 JIB NO.1 TELESCOPIC CYLINDER 2-108
13.2.2 JIB NO.2 TELESCOPIC CYLINDER 2-110
13.3 JIB TELESCOPIC CYLINDER HYDRAULIC SCHEMATIC DIAGRAM 2-112
13.4 COUNTER BALANCE VALVE (FOR TELESCOPIC AND DERRICK CYLINDERS) 2-113
13.4.1 STRUCTURAL DRAWING 2-113
13.4.2 FAILURE CAUSE AND COUNTERMEASURE 2-113
13.4.3 WORKING DIAGRAM 2-114
13.5 SEQUENCE VALVE (FOR TELESCOPIC CYLINDER) 2-115
13.5.1 STRUCTURAL DRAWING 2-115