The first section hydraulic transmission principle
First, the basic composition of the hydraulic system
Second, the hydraulic system commonly used graphics and symbols
Third, the hydraulic circuit
Four, hydraulic transmission power calculation
Basic knowledge of fluid mechanics in the second quarter
First, the nature of hydraulic oil
Second, the excavator hydraulic system oil requirements
Third, the mechanical properties of fluid.
Fourth, pressure loss.
Five, the flow of oil in cracks and holes
Six, hydraulic impact and cavitation
Seven, friction and lubrication
Chapter II Technical Principle of Hydraulic System of Excavator
Section 1 Structure and Function of Hydraulic System of Excavator
First, the functional requirements of excavator hydraulic system
Second, the popular design scheme of excavator hydraulic system
Hydraulic pump in the second quarter
First, the pumping principle
Second, the variable form and variable principle of the pump
Third, the control of the pump
Four, the working principle and structure of common hydraulic pump
Section III Main Control Valve
First, the basic function of the main control valve
Second, the structure and working principle of common main control valves
The fourth quarter rotary motor and reducer
First, the requirements and working principle of rotating electrical machinery
Second, the structure and working principle of common rotating electric machines
Third, the rotary reducer.
Section 5 Walking Motor and Reducer
First, the requirements and working principle of walking motor
Second, the structure and working principle of common walking motors
Third, the walking reducer
Section 6 Rotating center joint (oil distribution cup)
Section 7 oil cylinder
Section 8 Pilotage System
I. Pilot pump, pilot oil filter and pilot relief valve
Second, the pilot valve (PPC valve)
Three. Safety cut-off valve (pilot cut-off valve)
Fourth, the accumulator
Five, other pilot control
Section 9 hydraulic hammer (spear head)
I. Types of hydraulic hammer
Second, the structure and working principle of hydraulic hammer.
Third, the installation of hydraulic hammer
Four, the use of hydraulic hammer matters needing attention
Verb (abbreviation of verb) nitrogen inspection and filling
Six, hydraulic oil and filter
Section 10 hydraulic accessories
I. backflow check valve
Second, the hydraulic oil tank and filter
Third, the shell oil drain filter.
Four, hydraulic oil radiator
Section 1 1 related electrical control
I. Electrical control elements related to hydraulic system
Second, the excavator's mechanical, electrical and hydraulic integrated control
Chapter III Disassembly and Inspection
Section 1 General knowledge
I. Matters needing attention
Second, the bolt
Third, adhesives and lubricants.
Fourth, the inspection method
Dismantling and inspection of common hydraulic pumps in the second quarter
First, Kawasaki K3V series hydraulic pump
Second, Hitachi human papillomavirus series hydraulic pump
Three, Rexroth A8V series hydraulic pump
Four, Carter series hydraulic pump
Verb (abbreviation of verb) Komatsu series hydraulic pump
Section III Disassembly and Inspection of Main Control Valve
I. Hitachi ZAXIS200 main control valve
Second, Komatsu main control valve
Three, Carter main control valve
Four. Shengang main control valve
Five, Sumitomo main control valve
Intransitive verb Volvo main control valve
Section 4 Dismantling and Inspection of Rotating Electric Machines and Reducers
I. M2X and M5X Series Rotating Electrical Machines
Second, KMF series rotating motors
Three. Komatsu PC200-7 rotary reducer
Four, Komatsu PC200-6 rotary reducer
Five, Carter excavator rotary motor and reducer
Six, Hitachi rotary reducer
Section 5 Dismantling and Inspection of Walking Motor and Reducer
First, the walking motor
Second, the walking reducer
Section 6 Disassembly and inspection of rotating center joint
A, Komatsu excavator rotary center joint
Second, Carter excavator rotary center joint
Three, Hitachi excavator rotary center joint
Four, other models of rotary center joint
Section 7 Disassembly and Inspection of Oil Cylinder
I. Precautions for disassembly and assembly of oil cylinder
Second, Komatsu oil cylinder
Three. Hitachi ZAXIS200 oil cylinder
Four, other models of oil cylinder
Five, when disassembling cylinder commonly used heavy wrench
Section 8 Removal and Inspection of Pilot Control Valve
I. Left and right pilot operated valves
Second, the walking pilot control valve
Chapter IV Testing Standards and Fault Diagnosis
The first section hydraulic system test methods, reference test standards and hydraulic pump output characteristics (reference)
First, the hydraulic system test method
Second, the hydraulic system reference test standard
Three. Output characteristics of hydraulic pump (reference)
Section 2 Fault Diagnosis
First, fault diagnosis information collection
Second, the general method of fault diagnosis
The third section fault code
A, Carter 320C fault code
Second, Carter 320B and 330B fault codes
Three, Carter 320 fault code
Four. Carter 320D fault code
Verb (abbreviation of verb) Fault code of Komatsu PC200-8
Six, Komatsu PC200-7 fault code
Seven, Komatsu PC200-6/PC300-6/PC400-6 fault code.
Eight, Hitachi ZAXIS200-3 fault code
Nine, Hitachi ZAXIS200 fault code
X. Hitachi EX200-5 fault code
XI。 Hitachi EX200-2 and EX200-3 fault codes
Twelve, SK200-8 fault code of Kobelco
Thirteen. Fault code of SK200-6 at Kobelco
Fourteen Fault codes of SK200-2 and SK200-3 at Kobelco.
Fifteen, Kato HD820 fault code
Sixteen. Sumitomo SH200-3 Fault Code
Seventeen. Sumitomo SH2 10-5 Fault codes of host system and engine system.
Eighteen, daewoo DH220-5 fault code
Nineteen. Fault codes of modern R220-5 and R225LC-7
20. Volvo EC2 10B fault code
The fourth quarter typical fault analysis
First, the engine is overloaded (stuck in the car)
Second, all the movements are slow or weak.
Third, the whole car has no action.
Four, one side can't walk (one side is completely motionless forward and backward)
Five, a variety of actions at the same time on one side or slow, weak (such as bucket action and right walking action at the same time)
Six, walking deviation
Seven, walking weakness
Eight, the compound action is not good (the boom moves too slowly when it rises and retracts the stick at the same time)
Nine, slow action response (long delay)
Ten, trembling.
Eleven, can not be transferred
Twelve, the slewing braking distance is too large.
Thirteen, the cylinder settlement is too fast.
14. The pump or motor has abnormal sound.
Fifteen, hydraulic oil temperature is too high (oil temperature alarm)
Sixteen, cylinder piston rod bending deformation
Seventeen, neutral pressure is too high (even difficult to start)
Eighteen, oil leakage
Chapter V Parts Repair
Section 1 Failure Analysis of Parts
A, parts wear failure analysis
Second, the parts deformation failure analysis
Three, the parts fracture (rupture) failure analysis
Four, parts corrosion failure analysis
Section 2 Common Maintenance Techniques
A, machining repair process
Second, the welding repair process
Third, electroplating repair process
Four, other repair technologies and processes
Section 3 Repair of Typical Parts
I. Repair of variable piston of hydraulic pump and piston hole of pump housing
Second, the repair of the fit clearance between the main control valve rod and the valve body hole.
Third, the repair of other common parts.
The sixth chapter introduces the hydraulic system and electrical control system of the latest excavators (Carter 320D excavator, Hitachi ZAXIS200-3 excavator, Komatsu PC200-8 excavator and Sumitomo SH2 10-5 excavator).
I. Carter 320D excavator
Second, Hitachi ZAXIS200-3 excavator
Three. Komatsu PC200-8 excavator
Four, Sumitomo SH2 10-5 excavator
……