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Sany Original Tandem Piston Pump Assembly K7V280DTH1M3L-0E01-V Sany Part Number: 150106010111A Applicable Models: SY1250H, SY1350H
Place of Origin:Japan
Brand Name:Sany and Kawasaki
Model Number:150106010111A / K7V280DTH1M3L-0E01-V
Minimum Order Quantity:1pcs
Price:Negotiable
Payment Terms:T/T,Western Union
Supply Ability:1-1000pcs
Product Description
Detailed Product Specification for Sany Original Tandem Piston Pump Assembly K7V280DTH1M3L-0E01-V
Physical Picture of K7V Tandem Piston Pump
Side View Actual Shot of Pump Assembly
I. Basic Material Information
Full Product Name: Sany Original Kawasaki K7V Series Inline Electronically Controlled Variable Displacement Tandem Axial Piston Main Pump Assembly
Model No.: K7V280DTH1M3L-0E01-V
Sany Original Material Code: 150106010111A
Brand Description: Genuine hydraulic main pump manufactured by Kawasaki Heavy Industries, Japan; exclusive OEM power pump matched for Sany SY1250H / SY1350H ultra-large mining excavators
Supply Status: In Stock, Wooden Case Packaging, US Dollar Price Negotiable
Applicable Excavator Models:
Sany Ultra-Large Mining Excavators SY1250H, SY1350H (120-ton heavy-duty mining excavators matched with high-power QSK23 engine)
Structure Form: Integrated through-shaft tandem dual-pump design with independent displacement regulation for left and right pumps, equipped with E01-V full-electronic proportional regulator assembly adopting cross constant power control logic
II. Core Function Definition
This tandem piston pump is the power core of the complete hydraulic system of SY1250H/SY1350H, supplying high-pressure hydraulic oil to all executive components including boom, arm, bucket, left & right travel and swing mechanisms. It adopts independent displacement regulation plus merging & split oil supply strategy for dual pumps. The vehicle ECU adjusts the output power of the QSK23 engine in real time via electronic regulators: dual pumps combine to deliver large flow and powerful breakout force during heavy-load digging; single pump unloads for energy saving under light-load conditions such as swing and single-side travel, which greatly reduces overflow loss.
It integrates three control logics: constant power control, pressure cut-off overload protection and negative flow electronic regulation. The pump automatically relieves pressure once the pressure exceeds the threshold, preventing high-pressure impact from damaging high-value hydraulic components such as main control valves, hydraulic cylinders and hydraulic motors. It is perfectly suitable for long-term full-load mining operations including rock excavation, truck loading and steep-slope working scenarios.
III. Overall Structure & Material Grade of Key Components
1. Overall Structural Layout (From Input Shaft End to Oil Outlet End)
Engine Connection Flange → Through-Type Main Input Drive Shaft → Left Pump K7V280 Cylinder Block, Piston & Valve Plate Assembly → Right Pump K7V280 Cylinder Block, Piston & Valve Plate Assembly → Dual Swashplate Displacement Mechanism Assembly → E01-V Electronic Proportional Solenoid Valve Regulator Group → Pump Housing Assembly → Common Oil Inlet, Independent High-Pressure Oil Outlets for Dual Pumps, Pilot Control Oil Port, Housing Drain Port, Air Vent & Oil Drain Plugs
2. Material and Heat Treatment Technology for Core Components
Pistons, Cylinder Blocks, Valve Plates: Made of high-toughness carburized bearing steel with integral carburizing quenching and ultra-precision mirror grinding. Working surface hardness: HRC60~64. Capable of enduring long-term high-pressure high-speed friction up to 35MPa, resisting cavitation and eccentric wear caused by impurities. Adapted to harsh mining environments with contaminated hydraulic oil containing dust and particles, with far superior wear service life compared to traditional K3V series pump cores.
Swashplates, Retainer Plates, Slipper Friction Pairs: Fabricated from high-strength quenched and tempered 40CrNiMo alloy steel, with copper-based sintered wear-resistant lining embedded inside slippers. Resistant to alternating impact loads, enabling smooth, jamming-free adjustment of swashplate angle, minimal deformation and slight internal leakage increment under prolonged heavy loads.
Pump Housing: Integrally cast from high-strength ductile iron with sufficient pressure margin for high-pressure chambers. It features excellent hydraulic impact resistance, vibration damping and noise reduction performance; high structural rigidity avoids deformation and oil leakage under high pressure.
Regulator Spool & Sleeve Pair: Precisely matched alloy steel treated by ion nitriding with micron-level fit clearance, featuring fast response and ultra-low internal leakage. It can withstand high temperature and prevent valve sticking induced by carbon sludge and deposits in hydraulic oil.
Complete Sealing System: Composite oil seals combining imported fluororubber and PTFE encapsulation, resistant to high pressure, high/low temperature hydraulic oil and aging, eliminating oil leakage on end covers, housing and regulating mechanisms.
Main Drive Heavy-Duty Bearing Assembly: Upsized matched tapered roller bearings and double-row angular contact bearings, bearing alternating axial and radial impact loads, ensuring stable high-speed operation and extending the overall overhaul cycle of the machine.
IV. Precise Technical Parameters
Theoretical Displacement per Single Pump: 280mL/r, Total Displacement of Tandem Pump: 560mL/r
Control Mode: E01-V full-electronic cross constant power displacement control, composite control of pressure cut-off and negative flow
Rated Working Pressure: 35MPa (350bar)
Instantaneous Peak Pressure: 40MPa (400bar)
Rated Matching Rotational Speed: 1800r/min, Maximum Allowable Operating Speed: 2100r/min
Maximum Output Flow per Pump @ 1800rpm: 504L/min; Total Output Flow of Tandem Pump: 1008L/min
Matched Engine Power: QSK23 powertrain rated 567kW @ 1800rpm
Applicable Hydraulic Oil Temperature Range: -22℃ ~ +99℃, adaptable to low-temperature winter operation and continuous high-temperature heavy-duty summer operation in mines
Net Weight of Assembly: 412kg
Protection Class: IP54, dust-proof and splash-proof against muddy water intrusion
Compatible Hydraulic Oil: 46#/68# anti-wear high-pressure hydraulic oil for construction machinery; required oil cleanliness: NAS Class 8 or better
Structural Advantage: Its axial length is approximately 10% shorter than the old K3V280 model, enabling more compact engine compartment arrangement
V. Core Product Advantages
Precise Interchangeability via Original Factory Part Code
Exclusive Sany material code 150106010111A. The input spline specification, mounting flange dimension, oil port layout and pin definition of electronic plug are 100% compatible with SY1250H/SY1350H. No pipeline modification or power curve recalibration is required; the whole assembly can be directly replaced and installed with zero assembly tolerance.
New-Generation Reinforced Design of K7V Series for Mining Application
As an upgraded successor of K3V series, it increases load margin for drive shaft and bearings with comprehensively improved impact resistance, fatigue resistance and cavitation resistance. It solves common defects including premature wear and excessive internal leakage of pump cores after long-hour high-pressure operation on ultra-large excavators, ideal for high-intensity mining scenarios such as hard rock excavation and continuous heavy-load truck loading.
Responsive E01-V Electronic Control for Fuel Saving & Efficiency Improvement
Independent electronic cross constant power regulation for dual pumps delivers high pump-valve matching accuracy and smooth, lag-free multi-action compound manipulation. Automatic displacement reduction and unloading under no-load conditions significantly cut overflow energy loss, reducing overall machine fuel consumption by 6%~13%, which conforms to Sany’s full-electronic hydraulic control strategy for complete machines.
Integrated Monolithic Layout with Lower Failure Rate
Regulator, overload relief valve and damping throttle valve are internally integrated, greatly simplifying external pipelines and reducing leakage points at joints. It instantly cuts off high pressure upon overload to systematically protect high-value core hydraulic components including main pump, main multi-way valve and large-tonnage hydraulic cylinders.
Adaptive Oil Supply Logic via Flow Merging & Splitting
Under heavy digging mode, dual pumps merge to supply ultra-large flow for powerful digging force; under light-load travel and swing conditions, single-pump independent oil supply realizes energy saving. It balances digging power output and fuel economy to meet coordinated multi-circuit compound movement demands of hundred-tonnage excavators.
Modular Structure with Controllable Maintenance Cost
Whole-assembly replacement and maintenance are available; wearing parts such as piston-cylinder assembly, electronic regulator, complete oil seal repair kit and bearings can be disassembled and replaced separately instead of replacing the entire main pump to cut overhaul costs. Drain ports and air vent plugs are pre-reserved on the housing for easy air bleeding and internal leakage inspection.
VI. Key Operation Points for Installation & Replacement
- System Pressure Relief: Shut down the engine, repeatedly actuate all control levers to release residual high pressure inside the hydraulic system, disconnect the negative terminal of the battery and implement safety protection measures for high-pressure work.
- Classified Pipeline Disassembly: Remove main oil inlet hose, dual-pump high-pressure outlet pipelines, pilot control hoses, wiring harness connector of electronic regulator and pump drain pipeline in sequence, and mark each pipeline to prevent reverse connection.
- Lifting & Removal of Old Pump: Loosen fixing bolts of the main pump, lift out the old pump assembly steadily with dedicated lifting rigging; clean oil stains and iron filings on the end face of engine connecting flange and inspect wear and collision damage of input spline.
- Positioning & Assembly of New Pump: Evenly apply oil-resistant sealant on the flange end face of the new pump, align the input spline and insert smoothly, then fasten fixing bolts evenly in diagonal multiple passes to avoid shaft binding and spline damage caused by eccentric load.
- Pipeline Reassembly: Restore all hydraulic pipelines according to previous marks, replace all O-rings and sealing gaskets with brand-new ones, and tighten all pipe joints to eliminate potential leakage risks.
- Oil Filling, Air Bleeding & Running-In: Fill qualified high-pressure hydraulic oil, loosen pump air vent plugs to exhaust air inside pump cavity and eliminate cavitation noise; connect electronic wiring harness and conduct 30-minute low-idle no-load running-in.
- Commissioning & Acceptance: Cyclically test single-pump and dual-pump merging actions under no-load state, inspect system pressure, flow, abnormal noise and leakage. Connect dedicated Sany diagnostic instrument to match pump control parameters and calibrate constant power curve. The assembly is deemed qualified if digging, travel and swing performances meet standards under full-load test.
VII. Common Faults, Causes and Operational Hazards
Howling Noise & Periodic Impact Noise from Pump Body
Causes: Air intake and insufficient oil supply, piston/valve plate scratching induced by oil impurities, damaged internal bearings, loose wear of input spline
Hazard: Long-term faulty operation will cause cylinder scoring and permanent scrapping of the entire pump assembly.
Weak Machine Movements, Failed Pressure Build-Up & Insufficient Anti-Stall Pressure
Causes: Excessive internal leakage from worn piston friction pairs, stuck spool of electronic regulator, premature tripping of pressure cut-off valve, insufficient swashplate swing angle due to stuck displacement mechanism
Hazard: Sharp decline in digging force, slipping during heavy loading and abrupt drop of overall working efficiency.
Oil Leakage on Pump Housing, End Covers & Pipe Joints
Causes: Aging and failed seals, loose housing fastening bolts, casting pinholes and cracks on housing, accelerated seal aging caused by excessive oil temperature
Hazard: Oil shortage and air intake aggravate internal wear, easily resulting in overheating and seizure of main pump.
Irregular Movement Speed, Stagnant Compound Movements & Unbalanced Flow Distribution
Causes: Stuck E01-V electronic solenoid valve, poor contact or short circuit of wiring, sludge coking on regulator spool, unsynchronized displacement variation between left and right pumps
Hazard: Degraded operation feel and uncoordinated mutual interference among digging, travel and swing actions.
Abnormally Rising Hydraulic Oil Temperature & System Overheating Alarm
Causes: Excessive internal leakage of pump, stuck displacement mechanism sustaining full-displacement overflow, clogged radiator, excessive return oil backpressure
Hazard: Accelerated oxidation and deterioration of hydraulic oil, rapid seal failure and cascading damage to the whole hydraulic system including multi-way valves, travel/swing motors.
Severe Pump Vibration, Engine Speed Drop or Flameout Under Heavy Load
Causes: Unbalanced constant power matching, stuck swashplate displacement mechanism, poor oil suction caused by clogged inlet filter
Hazard: Instant engine overload and flameout under heavy load; long-term impact damages engine crankshaft and powertrain assembly.
VIII. One-Stop Supporting Supply List (Complete Matching Parts for Hydraulic System)
- Same-model K7V280DTH tandem main pump assembly, piston-cylinder overhaul kits and pump core spare parts
- E01-V electronic proportional regulator, solenoid coils, spool & sleeve components and proportional valve assembly
- Complete oil seal repair kits, end cover sealing kits and dust seal assemblies for K7V280
- Hydraulic inlet filter, pilot filter, return filter and hydraulic oil maintenance consumables
- High-pressure main hoses, pilot hoses, pipe joints, shock-absorbing pipe clamps and sealing washer accessories
- Main multi-way valve, swing motor, travel motor, boom/arm/bucket cylinder assemblies for SY1250H/SY1350H
- Hydraulic pressure sensors, oil temperature sensors and complete main pump control wiring harness assembly
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