TOPMAQ TW08 MINI Manual
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TW08 MINI CRAWLER EXCAVATOR
OPERATION & MAINTENANCE MANUAL
HITCHON INTERNATIONAL LTD, 32 HAMMERMITH DRIVE, CHRISTCHURCH, NEW ZEALAND
Failure to follow these operating instructions and regularly maintain the excavator in accordance with these
instructions will void the warranty.
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Preface
Chapter I Usage Features and Performance Parameters of SDTW 0.8T Excavators
Section I Usage and features
Section II Main performance parameters
Chapter II Basic Structure and Work principle of SDTW 0.8T Excavators
Section I Overview
Section II Work principle
Section III Basic structure of mechanical system
Section IV Basic structure of hydraulic system
Chapter III Service Technologies of SDTW 0.8T Excavators
Section I Basic construction knowledge
Section II Preparation for work
Section III Operational essentials
Section IV Operational precautions
Chapter VI Maintenance of SDTW 0.8T Excavators
Section I Daily inspection
Section II Periods of overhaul, medium and minor repair
Chapter VII Troubleshooting of SDTW 0.8T Excavator
Section I General
Section II Troubleshooting of mechanical system
Section III Troubleshooting of hydraulic system
Section IV Troubleshooting of electrical control system
Section V Troubleshooting of engine
Section VI Other
Attachment: BOM List of SDTW 0.8T Parts
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Chapter I Usage Features and Performance Parameters of SDTW 0.8T
Excavators
Section I Usage and features
SDTW 0.8T Excavators are designed for excavating, crushing, ditch cleaning, drilling and bulldozing, using their
quick hitch attachments. In addition, they are easy to operate and transport and ideal to operate in narrow work
sites.
SDTW 0.8T Excavators, hydraulic type with single bucket
Main application: farming, landscaping, ditching and fertilization in garden, vegetable greenhouse, agricultural
transformation, indoor demolition, small earthwork, civil engineering, road recovery, basement and indoor
construction, concrete breaking, burying of cable, laying of water supply line, garden cultivation, desilting and
other applications.
These excavators are equipped with powerful diesel engines, domestic main pumps and rotary motors, Eton (USA)
traveling motor.
The SDTW 0.8T model is equipped with multiple attachments, such as quick hitch, log grab, leveling bucket,
auger, standard bucket and narrow bucket.An optional rake and ripper are also available on request.
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Quick hitch Narrow bucket
Log grab Mechanical thumb
Auger Ripper Rake
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Section II Main parameters
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Overall dimensions
Unit: mm
AWheel track
770
B Overall length of track
1090
C Ground clearance of platform
380
D Ground clearance of platform tail
784
E Chassis width
896
F Crawler width
170
H Crawler height
320
I Transportation length
2770
J Overall height
1330
Work range
Unit: mm
A Max. digging radius on ground
2850
B Max. digging depth
1650
C Max. digging height
2610
D Max. unloading height
1850
E Max. vertical digging depth
1375
F Min. swing radius
1330
G Max. lifting height of dozer blade
345
H Max. digging depth of dozer blade
255
Performance parameters
Weight of complete machine kg
880
Standard bucket capacity m³
0.025
Rated power kw
7.5
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Chapter II Basic Structure and Work Principle of SDTW 0.8T Excavators
Section I Overview on SDTW 0.8T excavators
The SDTW 0.8T excavator is composed of a power train, work implements, swing mechanism, control
mechanism, drive system, traveling mechanism and auxiliary equipment, as shown in fig. 1-1. Mounted on the
rotary table full-swing base are the main components of the drive system, swing mechanism and auxiliary devices,
which are referred to as the upper rotary. So, our SDTW 0.8T excavator is divided into work equipment, upper
rotary and traveling mechanism.
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Section II Work principle of excavators
Movement and power transmission route of excavator shown below:
1. Traveling power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to
hydraulic energy) —— distributor valve —— central swing joint —— traveling motor (hydraulic energy
changed to mechanical energy)—— sprocket —— rubber crawler—— starting of traveling
2. Swing power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to
hydraulic energy) —— distributor valve—— swing motor (hydraulic energy changed to mechanical energy)
—— slewing bearing —— realizing of wing
3. Boom power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to
hydraulic energy) —— distributor valve —— boom cylinder (hydraulic energy changed to mechanical
energy)——boom movement
4. Arm power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to hydraulic
energy) —— distributor valve —— arm cylinder (hydraulic energy changed to mechanical energy) —— arm
movement
5. Bucket power route: diesel engine ——coupler —— hydraulic pump (mechanical energy changed to
hydraulic energy) —— distributor valve —— bucket cylinder (hydraulic energy changed to mechanical
energy) —— bucket movement
Central
slewing joint
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Section III Basic structure of SDTW 0.8T excavators mechanical system
1 Power system
The SDTW 0.8T excavator is equipped with single-cylinder air-cooling diesel engine.
2 Drive system
The SDTW 0.8T excavator's drive system transfers the output power from the diesel engine, through the hydraulic
system to the work equipment, swing mechanism and traveling mechanism.
3 Swing mechanism
The Swing mechanism turns the work equipment and upper rotary in left and right directions, to allow excavating
and unloading. The SDTW 0.8T excavator’s swing mechanism fixes the rotary table onto the frame allowing it to
swing without any inclining risk. The machine is equipped with slewing supports and a slewing drive (power of
turntable slewing), known as the swing mechanism.
3.1 Slewing support
The SDTW 0.8T excavator has its rotary table supported with a rolling bearing, allowing the swinging of
upper rotary.
3.2 Rotary drive
The SDTW 0.8T excavator adopts a direct drive system. Namely, the output shaft of the low-speed
high-torque hydraulic motor is mounted with a driving pinion which meshes with the slewing gear ring.
4 Traveling mechanism
The Traveling mechanism supports the complete weight of excavator and drives it to operate.
The SDTW 0.8T excavator has a crawler traveling mechanism similar to other crawlers, with one hydraulic motor
driving one track. This excavator adopts a low-speed high-torque motor. When two hydraulic motors run in the
same direction, this machine goes straight forward; when one motor is engaged and the other is braked, the
excavator steers around the braked track; when the two motors run in reverse, the excavator rotates in situ.
Each part of traveling mechanism is mounted on an integral traveling frame. Pressurized oil from the hydraulic
pump goes through the multi-directional valve in the central swing joint, into the hydraulic traveling motor that
changes the pressure energy into output torque, which then goes to the sprocket to drive the excavator.
The SDTW 0.8T excavator’s sprockets are integrally casted and able to correctly engage with the track, to achieve
a balanced drive. Sprockets located at the rear of the excavator, shorten the tensioner and reduce track abrasion,
wear and power consumption.
5 Work equipment
The hydraulic excavator can use multiple work implements.
The excavator boom, arm and bucket are articulated with each other, as shown in figure and swing around their
articulated points respectively with the aid of the hydraulic cylinder.
5.1 Boom
As the main component of the excavator, the integrated skewed boom is adopted on to the SDTW 0.8T excavator,
allowing the excavator to dip deeper and to achieve a lower unloading depth.
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5.2 Bucket
5.2.1 Basic requirements:
1) The longitudinal profile of the bucket allows a variety of materials to be moved with the bucket.
2) Bucket teeth are fitted to increase the linear specific pressure of the bucket onto the material, with
the cutting resistance relatively low, making it easy to cut in and break soil. In addition, the teeth
are resistant to wear and easy to replace.
3) The collected load is easy to unload, shortening the unloading time and increasing the effective
capacity of the bucket.
5.2.2 Structure:
The bucket shape and size of the backhoe are specific to the material being worked. In order to meet
various excavation requirements, one excavator could be equipped with multiple types of buckets, with
the backhoe being the most popular.
The connection between the bucket and hydraulic cylinder is through a linkage mechanism, with the
bucket being directly articulated with the hydraulic cylinder, which drops the rotation angle of the
bucket, but still enables the torque to change greatly.
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