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© Feb. 2023
ii
TB20J Plus Maintenance Manual
Check Oil Level in Slewing Reducer. 40
Replace Gear Oil in Slewing
Reducer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Lubricate Slewing Bearing . . . . . . . . . . . 41
Inspect Slewing Bearing Bolts . . . . . . . 41
Adjust Gear Backlash of Slewing
Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Disassembly and Installation . . . . . . . . 43
5.5 Counterweight . . . . . . . . . . . . . . . . . . . 45
5.6 Hydraulic Generator. . . . . . . . . . . . . . 45
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Debugging . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.7 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6 Boom and Platform
Assembly ....................... 49
6.1 Boom and Platform System . . . . . . 49
Broken Wire Rope Detection System49
Platform Control Enable System. . . . . 49
Transport Position Sensing System . 49
Load Sensing System . . . . . . . . . . . . . . . 49
6.2 Platform and Jib Boom . . . . . . . . . . . 50
Platform Controller. . . . . . . . . . . . . . . . . . . 50
Platform Assembly. . . . . . . . . . . . . . . . . . . 50
Jib Boom Assembly. . . . . . . . . . . . . . . . . . 51
Swing Cylinder. . . . . . . . . . . . . . . . . . . . . . . 51
Upward Leveling Cylinder . . . . . . . . . . . 52
6.3 Boom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Cable Track Assembly. . . . . . . . . . . . . . . 52
Downward Leveling Cylinder . . . . . . . . 53
Lift Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Main Boom Assembly . . . . . . . . . . . . . . . 54
Boom Slider. . . . . . . . . . . . . . . . . . . . . . . . . . 55
Telescopic Wire Rope . . . . . . . . . . . . . . . 56
Telescopic Cylinder . . . . . . . . . . . . . . . . . . 58
7 Power System ................ 59
7.1 Deutz D2.9L4 . . . . . . . . . . . . . . . . . . . . 59
7.2 Yuchai YCF30. . . . . . . . . . . . . . . . . . . . 65
7.3 Yanmar 4TNV88-BDFLTC . . . . . . . 71
7.4 Cummins QSF2.8 . . . . . . . . . . . . . . . . 78
7.5 Weichai WP3.2. . . . . . . . . . . . . . . . . . . 84
7.6 Auxiliary Power System . . . . . . . . . . 91
8 Hydraulic System ........... 93
8.1 Layout of Hydraulic Elements . . . . 93
8.2 Function Valves . . . . . . . . . . . . . . . . . . 95
8.3 Hydraulic Oil . . . . . . . . . . . . . . . . . . . 105
Check Oil Level . . . . . . . . . . . . . . . . . . . . 105
Check the Cleanliness of Hydraulic
Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Replace Hydraulic Oil. . . . . . . . . . . . . . 105
8.4 Hydraulic Tank . . . . . . . . . . . . . . . . . 106
Air Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Return Filter . . . . . . . . . . . . . . . . . . . . . . . 106
Suction Filter. . . . . . . . . . . . . . . . . . . . . . . 106
8.5 Hydraulic Oil High-pressure
Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.6 Oscillating Cylinder Exhausting 107
8.7 Oscillation Function Check. . . . . 107
Check Counterbalance Valve
Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Check Tie Rod of Oscillation Multi-
way Valve . . . . . . . . . . . . . . . . . . . . . . . . . 108
Test Oscillating Outrigger Function 108
8.8 Inspect Cylinder Drift . . . . . . . . . . . 108
8.9 Hydraulic Symbols . . . . . . . . . . . . . 108
8.10 Hydraulic Schematic Diagram .110
9 Electrical System.......... 113
9.1 Battery . . . . . . . . . . . . . . . . . . . . . . . . . .113
Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . .113
Adding Water . . . . . . . . . . . . . . . . . . . . . . .114
Equalization . . . . . . . . . . . . . . . . . . . . . . . .114
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
9.2 Fault Codes Description . . . . . . . .115
Machine Fault Codes . . . . . . . . . . . . . . .115
Engine Fault Codes. . . . . . . . . . . . . . . . .118

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