Main technical characteristic of hydraulic excavator NK750
○ Cummins diesel engine, water cooled, direct injection, turbo-charged and after cooled, electric control, it satisfies the emission requirement of Europe standard, grade Ⅲ
○ Control of constant power of single pump, limited power of three pumps for reasonable distribution of power
○ Starting with zero displacement so as to reduce the moment of resistance at starting
○ T echnique with pressure cut to protect hydraulic system and reduce the system heat
○ Secondary overloading for swing and normal closed brake for swing and travel ensure smoothly brake
○ Integrated oil& water cooler with compact conformation
○ The working attachment realized automatic level crowding with bucket to increase the bucket filling factor
○ Attachment designed by CAD, case shape and casting-welding structure realizing the high strength
○ Automatic central lubrication two pumps of system by control of micro-electronics to save daily lubrication
○ Better reliability with Parker hose &seals and Trelleborg cylinder seals
○ The Technique with disassembled undercarriage which is advanced to transport the machine quickly
○ LCD displayer, electronic monitoring & alarm, trouble record system
○ Cab with fixed elevation and integrated is provided with large tri-dimensional ventilation, fresh air circulation, large capacity air condition without fluorine
○ The operator’s cab with the wide vision field and the streamlined appearance, matching the decoration and function with human nature, and offering the working environment in a car.
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Main Technology Data of Hydraulic Excavator NK750
No.
|
Item
|
Unit
|
Date
|
Face shovel
|
Backhoe
|
1
|
Machine weight
|
t
|
75
|
73
|
2
|
Bucket capacity
|
Standard
|
m 3
|
4.5
|
3.5
|
Range
|
m 3
|
4.0~5.5
|
2.3~5.0
|
3
|
Diesel engine
|
Model
|
|
QSM11-C400
|
Power /Speed
|
kW/rpm
|
298/1800
|
Fuel tank Capacity
|
L
|
820
|
4
|
Hydraulic system
|
Type
|
|
Three pumps and three loops, limit load variable system
|
Max. pressure of main oil circuit
|
MPa
|
32
|
Max. flow of main oil circuit
|
L/min
|
2×415
|
Swing type
|
|
Independence open type
|
Flow of swing oil
|
|
1×415
|
Operating style
|
|
Pilot control
|
Hydraulic oil tank capacity
|
L
|
780
|
5
|
Performance
|
Swing speed
|
r/min
|
6.0
|
Travel speed
|
km/h
|
3.1
|
Max. pulling force
|
kN
|
457
|
Gradeability
|
%
|
70
|
Ground pressure
|
MPa
|
0.098
|
Circulating time of operation
|
s
|
20
|
6
|
Working date
|
Boom length
|
mm
|
4450
|
7000
|
Stick length
|
mm
|
2900
|
3400
|
Max. digging radius
|
mm
|
9280
|
12290
|
Max. digging depth
|
mm
|
2680
|
7741
|
Max. digging height
|
mm
|
9745
|
10286
|
Max. unloading height
|
mm
|
7680
|
7340
|
Max. digging force of stick
|
kN
|
334
|
233
|
Max. breakout force of bucket
|
kN
|
357
|
285
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Main Components of Hydraulic Excavator NK750
No.
|
Component Name
|
Model
|
Manufacturer
|
1
|
Diesel engine
|
QSM11-C400+AM365
|
Cummins/America
|
2
|
Main pump
|
2×A11VO190+1×A11VO190LR/11R
|
Rexroth/Germany
|
3
|
Main valve
|
8M8-32+M032
|
Rexroth/Germany
|
4
|
Double join valves
|
MO/2MO
|
Rexroth/Germany
|
5
|
Swing motor
|
A2FE125/61W
|
Rexroth/Germany
|
6
|
Swing reduction gear
|
GFB80T3B
|
Rexroth/Germany
|
7
|
Travel motor
|
A2FE125/61W
|
Rexroth/Germany
|
8
|
Travel reduction gear
|
GFT110T3
|
Rexroth/Germany
|
9
|
Logical valve
|
026710
|
Rexroth/Germany
|
10
|
Isolating valve
|
MH3WA06CG
|
Rexroth/Germany
|
11
|
Isolating valve
|
MH3WA06UG
|
Rexroth/Germany
|
12
|
Solenoid valve
|
4WE6C6X
|
Rexroth/Germany
|
13
|
Solenoid proportional
pressure-reducing valve
|
MHFP04G1
|
Rexroth/Germany
|
14
|
Armrest Pilot Valves
|
4TH6E70
|
Rexroth/Germany
|
15
|
Foot pedal pilot valves
|
2TH6NRP70
|
Rexroth/Germany
|
16
|
Foot pedal pilot valves for opening or closing bucket
|
2TH7Q06
|
Rexroth/Germany
|
17
|
Track Ass.
|
J01083DOM
|
ITM or Berco/Italy
|
18
|
Driver’s Seat
|
DS-85H
|
Grammer/China
|
19
|
Hydraulic hose + System seal
|
|
Parker/America
|
20
|
Cylinder seal
|
|
Trelleborg/America
|
21
|
Automatic lubricating system
|
|
BEKA/Germany or LINCOLN/America
|
22
|
Air-condition
|
|
Wuhan Jingdong/China
|