>> MAIN FEATURES : ▲ T he crawler excavator is an economic type excavator ,which matched YUCHAI engine with strong power and low noise and low oil consumption and environment protection ▲ Fitted imported brand main pump and valves . ▲ Adopted imported driving motor and swing motor. ▲...
>> MAIN FEATURES:
▲The crawler excavator is an economic type excavator ,which matched YUCHAI engine with strong power and low noise and low oil consumption and environment protection
▲Fitted imported brand main pump and valves .
▲ Adopted imported driving motor and swing motor.
▲ Adopted hydraulic pilot servo operation system and hydraulic oil radiator ensure the machine have high working efficiency .
▲The professional structural parts and working mechanism , ensure the machine has reliability and durability .
▲The breaking pipeline equipped improve the working performance .
▲Installed luxury full seal cabin with A/C and LCD display and LED lights etc.
▲ The humanized design , ensure the machine can comfortable operation and convenient maintenance.
Tier 3/ Stage III
Power /Rotation speed
Number of cylinder
Maximum Travel speed
Width of track shoe
Number of track shoe per side
Number of upper roller per side
Number of bottom roller per side
Standard Bucket capacity
Maximum Grade ability
Maximum Bucket digging force
Maximum Arm digging force
Hydraulic system pressure
Hydraulic oil tank
Overall dimension (L*W*H)
Height of cabin
Track length on ground(Axle base)
Minimum Ground clearance
Swing radius at tail
Maximum Digging height
Maximum Dumping height
Maximum Digging depth
Maximum Vertical digging depth
Maximum Digging radius
Minimum swing radius
Modern hydraulic excavators come in a wide variety of sizes. The smaller ones are called mini or compact excavators. For example, Caterpillar's smallest mini-excavator weighs 2,060 pounds (930 kg) and has 13 hp; their largest model is the largest excavator available (a record previously held by the Orenstein & KoppelRH400), the CAT 6090, which weighs in excess of 2,160,510 pounds (979,990 kg), has 4500 hp, and a bucket as large as 52.0 m³.
Hydraulic excavators usually couple engine power to (commonly) three hydraulic pumps rather than to mechanical drivetrains. The two main pumps supply oil at high pressure (up to 5000 psi) for the arms, swing motor, track motors and accessories while the third is a lower pressure (~700 psi) pump for pilot control of the spool valves; this third circuit allows for reduced physical effort when operating the controls. Generally, the 3 pumps used in excavators consist of 2 variable displacement piston pumps and a gear pump. The arrangement of the pumps in the excavator unit changes with different manufacturers using different formats.
The two main sections of an excavator are the undercarriage and the house. The undercarriage includes the blade (if fitted), tracks, track frame, and final drives, which have a hydraulic motor and gearing providing the drive to the individual tracks. The house includes the operator cab, counterweight, engine, fuel and hydraulic oil tanks. The house attaches to the undercarriage by way of a center pin. High pressure oil is supplied to the tracks' hydraulic motors through a hydraulic swivel at the axis of the pin, allowing the machine to slew 360° unhindered.
The main boom attaches to the house, and can be one of several different configurations:
Most are mono booms: these have no movement apart from straight up and down.
Some others have a knuckle boom which can also move left and right in line with the machine.
Another option is a hinge at the base of the boom allowing it to hydraulically pivot up to 180° independent to the house; however, this is generally available only to compact excavators.
There are also triple-articulated booms (TAB).
Attached to the end of the boom is the stick (or dipper arm). The stick provides the digging force needed to pull the bucket through the ground. The stick length is optional depending whether reach (longer stick) or break-out power (shorter stick) is required.
On the end of the stick is usually a bucket. A wide, large capacity (mud) bucket with a straight cutting edge is used for cleanup and levelling or where the material to be dug is soft, and teeth are not required. A general purpose (GP) bucket is generally smaller, stronger, and has hardened side cutters and teeth used to break through hard ground and rocks. Buckets have numerous shapes and sizes for various applications. There are also many other attachments which are available to be attached to the excavator for boring, ripping, crushing, cutting, lifting, etc. Excavators in Scandinavia often feature a tiltrotator which allows attachments rotate 360 degrees and tilt +/- 45 degrees, in order to increase the flexibility and precision of the excavator.
Before the 1990s, all excavators had a long or conventional counterweight that hung off the rear of the machine to provide more digging force and lifting capacity. This became a nuisance when working in confined areas. In 1993 Yanmar launched the world's first Zero Tail Swing excavator, which allows the counterweight to stay inside the width of the tracks as it slews, thus being safer and more user friendly when used in a confined space. This type of machine is now widely used throughout the world.
There are two main types of "Control" configuration generally use in excavators to control the boom and bucket, both of which spread the four main digging controls between two x-y joysticks. This allows a skilled operator to control all four functions simultaneously. The most popular configuration in the US is the SAE controls configuration while in other parts of the world, the ISO control configuration is more common. Some manufacturers such as Takeuchi have switches that allow the operator to select which control configuration to use.
Hydraulic excavator capabilities have expanded far beyond excavation tasks with buckets. With the advent of hydraulic-powered attachments such as a breaker, a grapple or an auger, the excavator is frequently used in many applications other than excavation. Many excavators feature a quick coupler for simplified attachment mounting, increasing the machine's utilization on the jobsite. Excavators are usually employed together with loaders and bulldozers. Most wheeled, compactand some medium-sized (11 to 18-tonne) excavators have a backfill (or dozer) blade. This is a horizontal bulldozer-like blade attached to the undercarriage and is used for levelling and pushing removed material back into a hole.