Sinoboom GTBZ26 User manual

GTBZ26/TB26/TB850
GTBZ28J/TB28J/TB910J
Maintenance
Manual
Part No.505031110002
Rev: A
Aug 2020
GTJZ
0608E (2132E)
GTJZ
0808E (2732E)
GTJZ
0808E (2732E)
GTJZ
0808E (2732E)
长沙市宁乡高新技术产业园区金洲大道东
128 号
0731-87116111 hr@sinoboom . c om . cn ww w .sinoboom . c om . cn
Al w ays F or B e t t er A cc ess Solution s
我们一直在追求新的高 度
尺寸 ：
210×285mm
20mm
20mm
产品说明书
PRODU C T MAN U AL

Operating, servicing and maintaining this vehicle or
equipment can expose you to chemicals including engine
exhaust, carbon monoxide, phthalates, and lead, which
are known to the State of California to cause cancer and
birth defects or other reproductive harm. To minimize
exposure, avoid breathing exhaust, do not idle the engine
except as necessary, service your vehicle or equipment in
a well-ventilated area and wear gloves or wash your
hands frequently when servicing. For more information
go to: www.P65warnings.ca.gov.

Please contact us:
Website : www.sinoboom.com
E-mail : [email protected]
Service Tel : [phone]
Sales Tel : [phone]
Fax : [phone]-16
Address : No.128, East Jinzhou Avenue, Ningxiang High-tech Industrial Park, Changsha,
Hunan, China
Zip Code : 410600
Copyright © Hunan Sinoboom Intelligent Equipment Co., Ltd. All Rights Reserved
The final interpretation right of this manual belongs to Hunan Sinoboom Intelligent Equipment Co., Ltd.
Manual revision history：
REV DATE DESCRIPTION REMARK
AAug, 2020 Original issue of the manual

APPLICATION
Use the following table to identify the specific serial number for
models included in this manual. Check the model of your machine before
consulting the manual, and then use the correct manual according to the
serial number of the model. See the nameplate on your machine to
identify the model and serial number. (See of the Operation Manual for
details.)
Model
Trade Identification
Serial No.
Metric Imperial
GTBZ26 TB26 TB850 From 0503100100 to present
GTBZ28J TB28J TB910J From 0503200400 to present
NOTE:
•Product model is applied in product nameplate for distinction of products of different main
parameters.
•Product trade identification is applied in marketing and machine decals for distinction of products of
different main parameters, and can be classified as metric type and imperial type: The metric type of
trade identification is applicable to machines for countries/regions using metric system or as
specially required by customers; The imperial type of trade identification is applicable to the
machines for countries/regions using imperial system or as specially required by customers.

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STATEMENTS
Hunan Sinoboom Intelligent Equipment Co., Ltd. (Hereinafter referred to as Sinoboom) will upload the
latest product manual information to the website www. sinoboom. com as soon as possible. However,
due to continuous product improvement, the information in this manual is subject to change without prior
notice.
This manual covers the basic parts information of one or more products. Therefore, please use this
manual according to your needs. If you find problems in the manual or have suggestions for improve-
ment, feel free to share your feedback with Sinoboom, and we will address these issues as soon as
possible.
Feel free to consult and download the Operation Manual,Maintenance Manual and Parts Manual of the
products you need online at www.sinoboom.com.
Hunan Sinoboom Intelligent Equipment Co., Ltd. retains the right of final interpretation of the manual.

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GTBZ26&28J Maintenance Manual i© Aug 2020
TABLE OF CONTENTS
Introduction ..............................v
1 Safety............................... 1-1
Safety Definitions . . . . . . . . .. . . . . . . . . . . . 1-1
Reporting Accidents. . . . . . . . . . . . . . . . . . . 1-1
Electrocution Hazards. . . . . . . . . . . . . . . . . 1-1
Tipping Hazards and Rated Load . . . . . 1-2
Work Environment Hazards . . . . . . . . . . . 1-4
Unsafe Operation Hazards. . . . . . .. . . . . 1-5
FallHazards...........................1-7
Collision Hazards . . . . . . . . . . . . . . . . . . . . . 1-7
Crush Hazards . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Explosion and Fire Hazards. . . . . . . . . . . 1-9
Damaged Machine Hazards . . . . . . . . . . 1-9
Bodily Injury Hazards . . . . . . . . . . . . . . . . . 1-9
Battery Hazards . . . . . . . . . . . . . . . . . . . . . . . 1-9
Hydraulic Hazards . . . . . . . . . . . . . . . . . . .1-10
Welding and Polishing Requirements1-10
After Using the Machine. . . . . . . . . . . . . . 1-11
2 Specifications .................... 2-1
Performance Parameters .. . . . . . . . . . . . 2-1
Engine Specifications . . . . . . . . . . . . . . . . . 2-7
Function Speed . . . . . . . . . . . . . . . . . . . . . . . 2-7
Major Component Weights. . . . . . . . . . . . 2-8
Power System Specifications . . . . . . . . . 2-9
Hydraulic Hose and Fitting
Specifications . . . . . . . . . . . . . . . . . . . . . . . .2-10
Hydraulic Hose Torque . . . . . . . . . . . .2-10
Hydraulic Fitting Torque . . . . . . . . . . .2-10
Hydraulic Hose and Fitting Torque
Procedure . . . . . . . . . . . . . . . . . . . . . . . . .2-13
Fastener Torque Specifications . . . . . .2-13
3 System Descriptions............ 3-1
Power System. . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Hydraulic System . . . . . . . . . . . . . . . . . . . . . 3-1
Electrical System. . . . . . . . . . . . . . . . . . . . . . 3-1
Machine Control System . . . . . . . . .. . . . . 3-1
Safety Measures . . . . . . . . . . . . . . . . . . . . . . 3-1
4 Service and Guidelines......... 4-1
Machine Preparation, Inspection and
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
General.............................4-1
Preparation, inspection and
maintenance . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Qualified Sinoboom equipment
mechanic ...........................4-1
Pre-operation inspection. . . . . . . . . . . . 4-1
Pre-delivery inspection and
frequent inspection . . . . .. . . . . . . . . . . . 4-1
Annual machine inspection . . . . . . . . . 4-1
Preventive maintenance . . . . . . . . . . . . 4-2
Maintenance and Servicing
Precautions ...........................4-3
General.............................4-3
Safety and workmanship . . . . . . . . . . . 4-3
Cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Component removal and installation4-3
Component disassembly and
assembly ...........................4-4
Pressure-fit parts . . . . . . . . . . . . . . . . . . . 4-4
Bearings ............................4-4
Gaskets.............................4-4
Bolt usage and torque application . . 4-4
Hydraulic lines and electrical wiring 4-4
Hydraulic system . . . . . . . . . . . . . .. . . . . 4-4
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Battery..............................4-5
Pins and composite bearing. . . . . . . . . . . 4-5
Application of Insulating Silicone
Grease to Electrical Connections . . . . . 4-5

© Aug 2020 ii GTBZ26&28J Maintenance Manual
5 Maintenance Procedures ...... 5-1
Conducting a Pre-delivery Inspection . 5-1
Following a Maintenance Schedule . . . 5-2
Completing a Repair & Inspection
Report.................................5-2
Checklist A Procedures . . . . . . . . . . . . . . . 5-5
A-1 Inspect All Manuals. . . . . . . . . . . . . 5-5
A-2 Inspect All Decals . . . . . . . . . . . . . . 5-5
A-3 Inspect Damaged, Loose or
LostParts...........................5-6
A-4 Inspect Hydraulic Oil Level . . . . . 5-6
A-5 Inspect Hydraulic Leakage . . . . . 5-6
A-6 Inspect Fuel Level . . . . . . . . . . . . . . 5-7
A-7 Inspect Fuel Leakage . . . . . . . . . . 5-8
A-8 Inspect Engine Oil Level. . . . . . . . 5-8
A-9 Inspect Coolant Level . . . . . . . . . . 5-9
A-10 Inspect Engine Belt . . . . . . . . . .5-10
A-11 Inspect Fuel Filter . . . . . . . . . . . .5-10
A-12 Inspect Cooling Fan. . . . . . . . . . 5-11
A-13 Inspect Engine Intake
System.............................5-11
A-14 Functional Tests. . . . . . . . . . . . . . 5-11
A-15 Test Floating Outrigger (if
Equipped)..........................5-15
A-16 Test Drive Speed. . . . . . . . . . . . .5-15
A-17 Test Emergency Lowering
Function ...........................5-15
A-18 Test Tilt Protection System . . .5-16
A-19 Test Weighing System . . . . . . .5-16
A-20 Perform Maintenance after
30 Days............................5-17
Checklist B Procedures . . . . . . . . . . . . . .5-17
B-1 Replace Hydraulic Oil Tank
Return Filter . . . . . . . . . . . . . . . . . . . . . . .5-17
B-2 Inspect Rim, Tire and
Fasteners..........................5-18
B-3 Inspect Hydraulic Oil . . . . . .. . . .5-18
B-4 Inspect Cooling System . . . . . . .5-19
B-5 Replace Fuel filter . . . . . . . . . . . . .5-19
B-6 Inspect Air filter of Hydraulic
Tank ...............................5-19
B-7 Replace High-Pressure Filter. .5-20
B-8 Replace Air Filter of Engine . . .5-20
B-9 Inspect Length and Angle
Sensors............................5-21
B-10 Inspect Engine Exhaust
System.............................5-21
B-11 Inspect Drive Reducer Oil
Level...............................5-21
B-12 Inspect Slewing Reducer Oil
Level...............................5-22
B-13 Inspect Slewing Bearing
Bolts ...............................5-22
B-14 Lubricate Slewing Bearing . . .5-23
B-15 Inspect Platform Rotate
Cylinder Fasteners . . . . . . . . . . . . . . . .5-23
B-16 Test Cylinder Drift . . . . . . . . . . . .5-24
B-17 Test Float Cylinder
Exhausting and Counterbalance
Valve Locking . . . . . . . . . . . . . . . . . . . . . .5-24
B-18 Inspect Electrical Wiring . . . . .5-25
B-19 Inspect the battery . . . . . . . . . . .5-25
Checklist C Procedures . . . . . . . . . . . . . .5-25
C-1 Replace Fuel Filter Element. . .5-25
C-2 Inspect Boom Extend/Retract
Cables and Pulleys . . . . . . . . . . . . . . . .5-26
C-3 Replace Engine Oil. . . . . . . . . . . .5-26
C-4 Replace Engine Oil Filter . . . . . .5-27
Checklist D Procedures . . . . . . . . . . . . . .5-27
D-1 Replace Drive Reducer Gear
Oil..................................5-27
D-2 Replace Slewing Reducer
GearOil............................5-28
D-3 Replace Hydraulic Oil . . . . . . . . .5-28
D-4 Replace Hydraulic Tank
Suction Filter. . . . . . . . . . . . . . . . . . . . . . .5-28
D-5 Replace Coolant and Coolant
Hoses..............................5-29

GTBZ26&28J Maintenance Manual iii © Aug 2020
D-6 Replace Fuel Hoses. . . . . . . . . . .5-29
D-7 Inpsect Boom Wear Pads . . . . .5-30
6 Repair Procedures .............. 6-1
Boom and Platform Components . . . . . 6-1
Boom and Platform Systems . . . . . . . 6-1
Platform Controller. . . . . . . . . . . . . . . . . . 6-2
Platform.............................6-2
Platform Swing Motor. . . . . . . . . . . . . . . 6-2
Jib Boom Assembly (GTBZ28J
only) ................................6-2
Platform Level Cylinder . . . . . . . . . . . . . 6-3
Cable Track Assembly . . . . . . . . .. . . . . 6-3
Wire Rope Tensioning Adjustment. . 6-4
Main Boom Assembly . . . . . . . . . . . . . . 6-5
Chassis and Turntable Components . . 6-6
Tires and Rims. . . . . . . . . . . . . . . . . . . . . . 6-6
Reducer and Drive Motor . . . . . . . . . . . 6-7
Turntable Slewing Mechanism. . . . . 6-11
Engine .............................6-14
Hydraulic System . . . . . . . . . . . . . . . . . . . .6-16
Hydraulic Symbols . . . . . . . . . . . . . . . . .6-16
Hydraulic Schematic Diagram . . . . .6-18
Electrical System. . . . . . . . . . . . . . . . . . . . .6-22
Use and Maintenance of Battery. . .6-22
Electrical Symbols . . . . . . . . . . . . . . . . .6-22
Electrical Schematic Diagram . . . . .6-25
Appendix 1: Prepare the Word
Record before Delivery........ A-1
Appendix 2: Repair & Inspection
Report .............................A-3

© Aug 2020 iv GTBZ26&28J Maintenance Manual

GTBZ26&28J Maintenance Manual v© Aug 2020
INTRODUCTION
Thank you for choosing and using the machinery of
Hunan Sinoboom Intelligent Equipment Co., Ltd. Al-
ways read, understand and become familiar with the
operation requirements of the machine and its associ-
ated safety procedures before operating, maintaining
and repairing the machine. Operating the machine with-
out becoming familiar with its specific operation require-
ments and safety procedures poses serious risks.
Operators who follow safety rules and operate the ma-
chine carefully and effectively will prevent personal in-
jury, property loss and accidents.
Use this machine only to transport tools to work loca-
tions and for performing tasks on the work platform. Op-
erators must be competent and must obtain training to
carefully use the machine and follow safety procedures.
Only trained and authorized personnel may operate the
machine.
This manual guides the operator and authorized per-
sonnel in maintaining the machine. The operator is re-
sponsible for reading, understanding and implementing
the maintenance and safety procedures in this manual
and for following the manufacturer’s instructions before
beginning any work. Read, understand and follow all
safety rules and operating instructions. The operator
must also consider the machine’s uses and limitations
and the conditions at the jobsite before using this ma-
chine. Strictly following all safety requirements in this
manual is critical.
Consider this manual a part of the machine, along with
Operation Manual and Parts Manual, and always keep
the manuals with the machine. The owner or adminis-
trator of the machine shall offer all manuals and other
necessary information provided by the machine manu-
facturer regarding the daily inspection and maintenance
to each of the renters. If the machine is sold, the owner
or administrator must pass along the manuals and other
necessary information to the purchaser. The owner or
administrator of the machine shall also provide the
manufacturer’s maintenance information to the person
responsible for maintaining the machine.
If you have any questions, contact Hunan Sinoboom In-
telligent Equipment Co., Ltd..

© Aug 2020 vi GTBZ26&28J Maintenance Manual
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GTBZ26&28J Maintenance Manual 1-1 © Aug 2020
1SAFETY
Read, understand and comply with the safety rules and
regulations of your workplace and your government.
Before using the machine, obtain proper training on
safe machine operation and make sure you can safely
control and operate the machine.
Understand that as the operator you have the
responsibility and right to shut down the machine in
case of failure with the machine or other emergency at
your workplace.
NOTICE
People suffering from heart disease, hypertension,
epilepsy and other diseases and people who fear
heights must never operate or use this machine.
Also, people who have alcohol or drugs in their
system, or experience excessive fatigue or
depression, are prohibited from operating or using
this machine.
SAFETY DEFINITIONS
This safety alert symbol appears with
most safety statements. It means
attention, become alert, your safety is
involved! Please read and abide by the
message that follows the safety alert
symbol.
Indicates a hazardous situation that, if not
avoided, will result in death or serious injury.
Indicates a hazardous situation that, if not
avoided, could result in death or serious injury.
Indicates a hazardous situation that, if not
avoided, could result in minor or moderate injury.
NOTICE
Indicates a situation that can cause damage to the
engine, personal property and/or the environment, or
cause the equipment to operate improperly.
NOTE: Indicates a procedure, practice or condition that
should be followed in order for the engine or
component to function in the manner intended.
REPORTING ACCIDENTS
In case of any accident involving the machinery of
Hunan Sinoboom Intelligent Equipment Co., Ltd., notify
Hunan Sinoboom Intelligent Equipment Co., Ltd.
Immediately, even if no personal injury or property
damage occurs during the accident. Contact Hunan
Sinoboom Intelligent Equipment Co., Ltd. by telephone
and provide all necessary details. Failure to notify the
manufacturer within 48 hours of the incident involving
the machinery of Hunan Sinoboom Intelligent
Equipment Co., Ltd. may void the product's warranty.
NOTICE
Thoroughly inspect the machine and all its functions
after any accident, being sure to test first from the
ground controller and then from the platform
controller. Ensure the machine's lifting height does
not exceed 3 m(9.8 ft) until all damage has been
repaired and all controllers operate properly.
ELECTROCUTION
HAZARDS
NOTE: This machine is not insulated and does not
have an electric shock protection function.
All operators and managers shall comply with national
or local regulations regarding the minimum safe
distance of live conductors above the ground. In the
absence of such requirements, operators and
managers should follow the minimum safety distance
requirements in Table 1-1 , page 1-2.

© Aug 2020 1-2 GTBZ26&28J Maintenance Manual
SAFETY
ELECTRICAL SHOCK HAZARDS
• Always maintain a safe distance
from power lines and electrical
equipment in accordance with
applicable government
regulations and see Table 1-1 ,
page 1-2.
• Consider platform and boom
movement, wire swinging or
drooping, beware of strong winds
or gusts, and do not operate the
machine when there is lightning
or heavy rain.
• If the machine comes into contact
with live wires, keep away from
the machine. Personnel on the
ground or on the platform must
not touch or operate the machine
until the power is switched off.
• Do not use the machine as a
ground wire during welding and
polishing operations.
Table 1-1
Voltage
(Phase to Phase, kV)
Minimum Safe Distance
(m/ft)
0-50 3.05 (10)
50-200 4.60 (15)
200-350 6.10 (20)
350 -500 7.62 (25)
500 -750 10.67 (35)
750 -1000 13.725 (45)
TIPPING HAZARDS AND
RATED LOAD
Maximum rated load bearing capacity of the platform:
Table 1-2
GTBZ26
Metric 250kg (unrestricted/2 persons & tools)
480kg (restricted/2 persons & tools)
Imperial 551 lb (unrestricted/2 persons & tools)
1058 lb (restricted/2 persons & tools)
GTBZ28J
Metric 250kg (unrestricted/2 persons & tools)
Imperial 551 lb (unrestricted/2 persons & tools)

SAFETY
GTBZ26&28J Maintenance Manual 1-3 © Aug 2020
TIPPING HAZARDS
• Personnel, equipment and
materials on the platform must
not exceed the maximum load
capacity.
• Only raise or extend the boom
when the machine is on solid,
level ground.
• Select only the low speed when
driving the machine on a slope.
• Do not use the tilt alarm as a level
indicator. The tilt alarm on the
platform will sound only if the
machine is heavily tilted.
• If the tilt alarm sounds when the
machine drives up a slope, please
lower the boom per the following
procedure and move the machine
onto firm level ground. Be sure
not to rotate the boom when
lowering.
1. Lower the main boom;
2. Retract the telescopic boom.
• If the tilt alarm sounds when the
machine drives down a slope,
please lower the boom per the
following procedure and move the
machine onto firm level ground.
Be sure not to rotate the boom
when lowering.
1. Retract the telescopic boom；
2. Lower the main boom.
• Do not drive faster than 0.8 km/h
(0.5 mph) when the platform is
raised.
• When the platform is raised, the
machine cannot travel on uneven
terrain, unstable surfaces or in
other dangerous conditions.
• Do not operate the machine
during strong winds or gusts, and
do not increase the surface area
of the platform or load. Increasing
the area exposed to the wind will
reduce the stability of the
machine.
• When the machine is on rough
ground, with gravel or other
uneven surfaces, or near holes
and steep slopes, maintain a
minimum distance of 0.6m (2ft)
and reduce the speed.
TIPPING HAZARDS
• When on the platform do not push
and pull objects outside of it. The
maximum lateral force allowed
is:400 N (90 lbf).
• Tow the machine only from the
tiedown/lifting points on the
chassis.
• Never use the boom or platorm to
stablize or support any objects
outside of the machine.
• Do not change any machine parts
that may affect safety and
stability.
• Do not replace key parts that
affect machine stability with
different weights or
specifications.
• Do not modify or change moving
aerial platforms without the
manufacturer’s prior written
permission.
• On the platform, do not attach an
additional device for placing tools
or other materials to the guardrail.
This will increase the platform
weight, surface area and load.
• Do not place on, or fasten any
overhanging load to any part of
this machine.
• Do not place ladders or
scaffolding on the platform or any
parts of the machine.
• Do not use the machine on a
moving or active surface or on a
vehicle. Ensure all tires are in
good condition, the slotted nuts
tightened and the cotter pins
complete.
• Do not use a battery that weighs
less than the original one(26kg[57
lb]), and do not remove or modify
the counterweight or other parts
of the battery box. The battery not
only provides power, it also
serves as a counterweight. The
battery is vital to maintaining the
stability of the machine.
• Do not use the platform or boom
assembly to push other machines
or objects.

© Aug 2020 1-4 GTBZ26&28J Maintenance Manual
SAFETY
TIPPING HAZARDS
• Do not let the platform or boom
assembly touch the nearby
structures.
• Do not tie off the platform with
rope or other binding materials to
the nearby structures.
• Do not put a load outside the
platform.
• When the platform is caught or
stuck or when other objects in the
vicinity impede its normal
movement, do not use the
platform controller to lower the
platform. If you intend to lower the
platform with a ground controller,
you must operate it only after all
personnel have left the platform.
WORK ENVIRONMENT
HAZARDS
UNSAFE JOBSITE HAZARDS
• Do not operate the machine on
surfaces, edges or potholes that
cannot bear the weight of the
machine. Raise or extend the
boom only when the machine is
on firm, flat ground.
• Never travel on uneven terrain or
unstable surfaces or in other
dangerous conditions when
raising the platform.
• When the machine is on rough
ground, with gravel or other
uneven surfaces, or near holes
and steep slopes, maintain a
minimum distance of 0.6m(2ft)
and reduce the speed.
• Do not use the tilt alarm as a
horizontal indicator. The tilt alarm
on the platform will sound only
when the machine is heavily tilted.
• If the tilt alarm sounds when the
machine drives up a slope, lower
the boom per the following
procedure and move the machine
onto firm level ground. Be sure
not to rotate the boom while
lowering.
1. Lower the main boom；
2. Retract the telescopic boom.
• If the tilt alarm sounds when the
machine drives down a slope,
lower the boom per the following
procedure and move the machine
onto firm level ground. Be sure
not to rotate the boom while
lowering.
1. Retract the telescopic boom；
2. Lower the main boom.
• Running speed should not exceed
0.8 km/h (0.5 in./second) when the
platform rises.
• If the machine can be used
outdoors, never operate it during
strong winds or gusts. Do not lift
the platform when the wind speed
exceeds 12.5 m/s (18 mph). If the
wind speed exceeds 12.5 m/s (18

SAFETY
GTBZ26&28J Maintenance Manual 1-5 © Aug 2020
UNSAFE JOBSITE HAZARDS
mph) after the platform is lifted,
fold the platform and do not
continue to operate the machine.
• Do not drive or lift the machine on
slopes, steps or vaulted surfaces
that exceed the maximum
gradeability of the machine.
Before or during machine operation, check the possible
hazards on the jobsite and beware of the restrictions
within the environment, including flammable and
explosive gas/dust.
Table 1-3
BEAUFORT
NUMBER
METERS/
SECOND
MILE/
HOUR
DESCRIPTI-
ON GROUND CONDITION
0 0～0.2 0～0.5 Calm Calm. Smoke rises vertically.
1 0.3～1.5 1～3Light air Wind motion visible in smoke.
2 1.6～3.3 4～7Light breeze Wind felt on exposed skin. Leaves rustle.
3 3.4～5.4 8～12 Gentle
breeze Leaves and smaller twigs in constant motion.
45.5～7.9 13～18 Moderate
breeze
Dust and loose paper rise. Small branches begin
to move.
5 8.0～10.7 19～24 Fresh breeze Smaller trees sway.
6 10.8～13.8 25～31 Strong
breeze
Large branches in motion. Flags waving near
horizontal. Umbrella use becomes difficult.
713.9～17.1 32～38
Near gale/
moderate
gale
Whole trees in motion. Effort needed to walk
against the wind.
8 17.2～20.7 39～46 Fresh gale Twigs broken from trees. Cars veer on road.
9 20.8～24.4 47～54 Strong gale Light structure damage.
NOTICE
Maximum gradeability is suitable for machines with
platform retracted.
Gradeability means the maximum allowable tilt angle
of the machine when it is on solid ground and the
platform is only capable of carrying one person. As
the weight of the machine’s platform increases, the
machine’s climbing capacity reduces.
Table 1-4
GTBZ26 GRADEABILITY
Uphill 30%/17° (2WD); 45%/24° (4WD)
downhill 10%/6° (2WD); 30%/17° (4WD)
sideslope 25%/14° (2WD); 25%/14° (4WD)
GTBZ28J GRADEABILITY
Uphill 30%/17° (2WD); 45%/24° (4WD)
Downhill 10%/6° (2WD); 30%/17° (4WD)
Sideslope 25%/14° (2WD); 25%/14° (4WD)
UNSAFE OPERATION
HAZARDS
At a minimum, operators must operate and maintain the
machine as stated in this manual and in the
Maintenance Manual in addition to following more

© Aug 2020 1-6 GTBZ26&28J Maintenance Manual
SAFETY
stringent industry regulations and workplace rules.
Never engage in unsafe machine operation.
UNSAFE OPERATION HAZARDS
• Do not push any object outside
the platform. The maximum
lateral force allowed is 400N
（90 lbf）.
• Tow the machine only from the
tiedown/lifting points on the
chassis.
• Never use the boom or platform
to stablize or support any
objects outside of the machine.
• Do not modify any component
that may affect the machine
safety and stability.
• Do not replace key parts that
affect machine stability with the
ones of different weights or
specifications.
• Do not change or modify
moving aerial platforms without
the manufacturer’s written
permission.
• On the platform, do not attach
an additional device for placing
tools or other materials to the
guardrail. This will increase the
platform weight, surface area
and load.
• Do not put ladders or
scaffolding on the platform or
any part of this machine.
• Do not use the machine on any
mobile or movable surface or
vehicle. Ensure all tires are in
good condition, the slotted nuts
tightened and the cotter pins
complete.
• Do not use a battery that
weighs less than the original
one(26kg[57 lb]), and do not
remove or modify the
counterweight or other parts
inside the battery box. The
battery not only provides
power, it also serves as a
counterweight. The battery is
vital to maintaining the stability
of the machine.
• Do not place or attach any
suspended load onto any part
of the machine.
• Do not use the machine as a
crane.