9 Maintenance ........................................................................................................................... 51
9.1 Maintenance general ...............................................................................................................51
9.2 Periodic maintenance schedule ..............................................................................................52
9.3 Truck used oil and lubrication ................................................................................................. 57
9.4 Replace hydraulic oil ............................................................................................................... 58
9.5 Replace wheels ....................................................................................................................... 59
9.5.1 Replace drive wheel ............................................................................................................... 59
9.5.2 Replace load wheels ...............................................................................................................60
9.5.3 Replace auxiliary wheel ..........................................................................................................61
9.6 Replace the key safe parts periodically ..................................................................................62
10 Relevant safety directive or standard (CE)...............................................错误！未定义书签。
Part Ⅱ：Structure, Principle and Maintenance .........................................................................63
1 Drive Unit................................................................................................................................ 63
1.1 Drive unit structure and principle ..........................................................................................63
1.2 Dismantle drive unit from the truck......................................................................................... 65
1.3 Assemble and use notice ........................................................................................................ 67
1.4 Fault and troubleshooting ....................................................................................................... 67
1.5 Drive motor ..............................................................................................................................68
1.6 Electromagnetic brake ............................................................................................................ 72
1.5.1 Electromagnetic brake working principle ................................................................................73
1.5.2 Electromagnetic brake installation ..........................................................................................74
1.5.3 Maintenance ............................................................................................................................75
1.5.4 Adjust the Air Gap of the Brake ..............................................................................................76
1.5.5 Common fault and troubleshooting ........................................................................................ 78
2 Hydraulic system .................................................................................................................... 80
2.1 Hydraulic system working principle .........................................................................................81
2.2 Hydraulic unit ...........................................................................................................................84
2.3 Hydraulic unit dismantle ..........................................................................................................87
2.4 Dismantle the lifting cylinder from the truck or replace.......................................................... 89
2.5 Hydraulic system fault diagnosis and correction .................................................................... 91
3 Electric system ........................................................................................................................92
3.1 Electrical schematic diagram .................................................................................................. 93
3.2 Drive motor controller ..............................................................................................................96
3.2.1 Maintenance ............................................................................................................................96
3.2.2 Fault code table ...................................................................................................................... 73
Attachment：Table for bolt’s tightening torque ...............................................................................84
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