© Dec 2021 ii GTZZ14EJ&16EJ Maintenance Manual
Application of Insulating Silicone
Grease to Electrical Connections . . . . . 4-6
5 Maintenance Procedures ...... 5-1
Conducting a Pre-delivery Inspection . 5-1
Following a Maintenance Schedule . . . 5-2
Checklist A Procedures . . . . . . . . . . . . . . . 5-2
A-1 Inspect All Manuals. . . . . . . . . . . . . 5-2
A-2 Inspect All Decals . . . . . . . . . . . . . . 5-3
A-3 Inspect Damaged, Loose or
LostParts...........................5-3
A-4 Inspect Hydraulic Oil Level . . . . . 5-3
A-5 Inspect Hydraulic Leakage . . . . . 5-4
A-6 Functional Tests . . . . . . . . . . . . . . . . 5-4
A-7 Perform Maintenance after 30
Days ................................5-6
Checklist B Procedures . . . . . . . . . . . . . . . 5-7
B-1 Inspect Electrical Wiring . . . . . . . . 5-7
B-2 Inspect the battery. . . . . . . . . . . . . . 5-7
B-3 Inspect Rim, Tire and Fasteners5-8
B-4 Inspect Hydraulic Oil . . . . . . . . . . . 5-8
B-5 Inspect and Replace Return
Filter Element . . . . . . . . . . . . . . . . . . . . . . . 5-8
B-6 Inspect the Maximum
Operating Range Restriction . . . . . . . 5-9
B-7 Inspect Slewing Bearing Bolts.5-10
B-8 Lubricate Slewing Bearing . . . . 5-11
B-9 Inspect Air filter of Hydraulic
Tank ...............................5-11
B-10 Replace High-Pressure Filter 5-12
B-11 Inspect Drive Reducer Oil
Level...............................5-12
B-12 Inspect Platform Rotate
Cylinder Fasteners . . . . . . . . . . . . . . . .5-12
B-13 Inspect Tilt Protection
System.............................5-13
B-14 Test Drive Speed. . . . . . . . . . . . .5-13
B-15 Test Emergency Lowering
Function ...........................5-14
B-16 Test Cylinder Drift . . . . . . . . . . . .5-14
Checklist C Procedures . . . . . . . . . . . . . .5-14
C-1 Replace hydraulic oil tank air
filter................................5-14
C-2 Inspect Weighing System . . . . .5-15
Checklist D Procedures . . . . . . . . . . . . . .5-15
D-1 Inpsect Boom Wear Pads . . . . .5-15
D-1 Replace Drive Reducer Gear
Oil..................................5-16
D-3 Replace Hydraulic Oil . . . . . . . . .5-16
D-4 Replace Hydraulic Tank
Suction Filter. . . . . . . . . . . . . . . . . . . . . . .5-17
6 Repair Procedures .............. 6-1
Boom and Platform Components . . . . . 6-1
Boom and Platform Systems . . . . . . . 6-1
Platform Controller. . . . . . . . . . . . . . . . . . 6-1
Platform.............................6-2
Platform Swing Motor. . . . . . . . . . . . . . . 6-2
Jib Boom Assembly. . . . . . . . . . . . . . . . . 6-2
Platform Leveling Cylinder. . . . . . . . . . 6-3
Cable Track Assembly . . . . . . . . .. . . . . 6-4
Main Boom Assembly . . . . . . . . . . . . . . 6-4
Telescopic Boom Assembly . . . . . . . . 6-5
Foldable Boom Assembly . . . . . . . . . . 6-6
Chassis and Turntable Components . . 6-7
Tires and Rims. . . . . . . . . . . . . . . . . . . . . . 6-7
Reducer and Drive Motor . . . . . . . . . . . 6-8
Battery Box . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Battery.............................6-10
Turntable Slewing Mechanism. . . . .6-10
Hydraulic System . . . . . . . . . . . . . . . . . . . .6-12
Hydraulic Element Layout . . . . . . . . .6-12
Function Valves. . . . . . . . . . . . . . . . . . . .6-12
Hydraulic Symbols . . . . . . . . . . . . . . . . .6-17
Hydraulic Schematic Diagram . . . . .6-18
Electrical System. . . . . . . . . . . . . . . . . . . . .6-18
Fault Code Description . . . . . . . . . . . .6-18
Use and Maintenance of Battery. . .6-29
Electrical Symbols . . . . . . . . . . . . . . . . .6-31
Electrical Schematic Diagram . . . . .6-34
