
© Jun 2022 ii GTJZ1012E&1212E Maintenance Manual
Conducting a Pre-delivery Inspection . 5-1
Following a Maintenance Schedule . . . 5-2
Completing a Repair & Inspection
Report.................................5-2
Checklist A Procedures . . . . . . . . . . . . . . . 5-4
A-1 Inspect All Manuals. . . . . . . . . . . . . 5-4
A-2 Inspect All Decals . . . . . . . . . . . . . . 5-5
A-3 Inspect Damaged, Loose or
LostParts...........................5-5
A-4 Inspect Hydraulic Oil Level . . . . . 5-5
A-5 Inspect Hydraulic Oil Leakage. . 5-6
A-6 Functional Tests . . . . . . . . . . . . . . . . 5-6
A-7 Inspect the Battery Level . . . . . . . 5-8
A-8 Perform Maintenance After 30
Days................................5-8
Checklist B Procedures . . . . . . . . . . . . . . . 5-8
B-1 Inspect Electric Wires . . . . . . . . . . 5-8
B-2 Inspect Rim, Tire and Fasteners5-9
B-3 Inspect Battery . . . . . . . . . . . . . . . .5-10
B-4 Inspect Hydraulic Oil . . . . . . . . . . 5-11
B-5 Inspect Air filter of Hydraulic
Tank ...............................5-11
B-6 Inspect Brake Manual Release
Function ...........................5-12
B-7 Inspect Emergency Lowering
Function ...........................5-13
B-8 Test Braking Device . . . . . . . . . . .5-13
B-9 Test Full Lift/Lower Time . . . . . .5-14
B-10 Test Drive Speed. . . . . . . . . . . . .5-14
B-11 Inspect the Tilt Protection
Function ...........................5-15
B-12 Inspect Pothole Guards . .. . . .5-16
Checklist C Procedures . . . . . . . . . . . . . .5-16
C-1 Replace Hydraulic Oil Tank Air
Filter ...............................5-16
C-2 Inspect Platform Weighing
System (optional) . . . . . . .. . . . . . . . . . .5-16
C-3 Inspect Up Limit Switch . . . . . . .5-17
C-4 Inspect Staged Lowering . . . . . .5-17
C-5 Inspect Carbon Brush of Motor5-18
Checklist D Procedures . . . . . . . . . . . . . .5-18
D-1 Inspect Scissor Arm
Installation Bearing . . . . . . . . . . . . . . . .5-18
D-2 Inspect Chassis Slider . . . . . . . .5-18
D-3 Replace Hydraulic Oil Tank
Return Oil Filter Element . . . . . . . . . .5-19
D-4 Replace Hydraulic Oil . . . . . . . . .5-19
6 Repair............................... 6-1
Platform Components . . . . . . . . . . . . . . . . . 6-1
Platform Controller. . . . . . . . . . . . . . . . . . 6-1
Platform.............................6-1
Extension Platform . . . . . . . . . . . . . . . . . 6-2
Scissor Components . . . . . . . . . . . . . . . . . . 6-2
Scissor Arm Assembly. . . . . . . . . . . . . . 6-2
Lift Cylinder . . . . . . . . . . . . .. . . . . . . . . . . . 6-2
Chassis Components . . . . . . . . . . . . . . . . . 6-3
Tires and Rims. . . . . . . . . . . . . . . . . . . . . . 6-3
Reducer & Drive Motor . . . . . . . . . . . . . 6-4
Front Wheel Bracket . . . . . . . . . . . . . . . . 6-4
Removing Steer Cylinder . . . . . . . . . . . 6-5
Battery..............................6-5
Hydraulic System . . . . . . . . . . . . . . . . . . . . . 6-5
Layout of Hydraulic Elements. . . . . . . 6-5
Hydraulic Valves . . . . . . . . . . . . . . . . . . . . 6-6
Regulating Hydraulic Valve
Pressure............................6-9
Adjusting the Emergency Lowering
Handle.............................6-10
Hydraulic Symbols . . . . . . . . . . . . . . . . . 6-11
Hydraulic Schematic Diagram . . . . .6-12
Electrical System. . . . . . . . . . . . . . . . . . . . .6-13
Use and Maintenance of Battery. . .6-13
Charger Troubleshooting . . . . . . . . . .6-15
Sinoboom Control System . . . . . . . . .6-16
DTC-K500 Control System . . . . . . . .6-22
Trouble Diagnosis . . . . . . . . . . . . . . . . .6-26
Fundamental Troubleshooting . . . . .6-36
Electrical Symbols . . . . . . . . . . . . . . . . .6-39