Zoomlion ZT20J, Service And Maintenance Manual

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VI
Contents
5.2.4 Lifting cylinder .............................................................................................. 5-8
5.2.5 Boom.............................................................................................................. 5-9
5.2.6 Telescopic cylinder ...................................................................................... 5-12
5.2.7 Wire rope pulley disassembly ...................................................................... 5-16
5.2.8 Wire rope and pulley check.......................................................................... 5-18
5.3 Load Cell Check ............................................................................................................ 5-20
5.4 Boom Tilt Sensor Check ................................................................................................ 5-21
5.5 Calibration of boom length sensor ................................................................................. 5-21
5.6 Check of Wire Rope Damage Indication System ........................................................... 5-22
5.7 Beyond the stowed position-limited speed check .......................................................... 5-22
SECTION 6 HYDRAULIC AND ELECTRICAL SYSTEM MAINTENANCE .................. 6-1
6.1 Hydraulic Filter Maintenance .......................................................................................... 6-1
6.1.1 High pressure filter ........................................................................................ 6-1
6.1.2 Oil filling filter ............................................................................................... 6-1
6.1.3 Return oil filter............................................................................................... 6-2
6.2 Pressure Setting ................................................................................................................ 6-2
6.3 Starting Procedure ............................................................................................................ 6-3
6.3.1 Drive pump oiling .......................................................................................... 6-3
6.3.2 Exhaust air in the pump inlet pipe ................................................................. 6-3
6.4 Fault code ......................................................................................................................... 6-4
6.5 Common Faults and Methods ........................................................................................ 6-10
SECTION 7 ELECTRICAL INFORMATION AND SCHEMATIC
7.1 General Introduction ........................................................................................................ 7-1
7.2 Multimeter Basic Operation ............................................................................................. 7-1
7.2.1 Grounding ...................................................................................................... 7-1
7.2.2 Backside detection ......................................................................................... 7-1
7.2.3 Minimum value/maximum value ................................................................... 7-1
7.2.4 Polarity ........................................................................................................... 7-1
7.2.5 Range ............................................................................................................. 7-2
7.2.6 Voltage measurement ..................................................................................... 7-2
7.2.7 Resistance measurement ................................................................................ 7-3
7.2.8 Conduction test .............................................................................................. 7-3
7.2.9 Current measurement ..................................................................................... 7-4