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Kawasaki Piston Motor M5X250CHB-10A-46A/275 Made in Japan Sany Material Code: 60201949 Fit for Sany Excavator Models: SY485H, SY500H, SY550H, SY1250H, SY1350H, as well as excavators of other brands.
Place of Origin:Japan
Brand Name:Sany and Kawasaki
Model Number:60201949 / M5X250CHB-10A-46A/275
Minimum Order Quantity:1pcs
Price:Negotiable
Payment Terms:T/T,Western Union
Supply Ability:1-10000pcs
Product Description
Detailed Product Specification for Kawasaki Swing Piston Motor M5X250CHB-10A-46A/275, Made in Japan
Kawasaki M5X Motor Main Body
M5X Motor Assembly with Reducer
I. Basic Material Information
Full Product Name: Kawasaki Heavy Industries Japan M5X250 Swashplate Axial Piston Swing Motor Assembly
Model No.: M5X250CHB-10A-46A/275
Sany Original Material Code: 60201949
Brand Introduction: Original imported swing drive motor manufactured by Kawasaki Heavy Industries, Japan, factory-standard rotary actuator for medium, large and ultra-large mining excavators of Sany
Supply Status: In Stock, Wooden Case Packaging, US Dollar Price Negotiable
Applicable Excavator Models:
Sany SY485H, SY500H, SY550H, SY980H, SY1250H, SY1350H; also compatible with same-tonnage excavators of other brands
Structure Type: Fixed-displacement swashplate axial piston motor, integrated with built-in parking brake, dual shock relief valves and anti-reverse makeup valve group. It can be matched with a two-stage planetary swing reducer assembly, serving as a dedicated rotary drive unit for the upper carriage of excavators.
II. Core Function Definition
This motor is the power core of the excavator upper swing system. It receives high-pressure hydraulic oil output from the main control multi-way valve and drives the swing reducer to rotate the entire upper structure to complete loading, material shifting, position adjustment and slope trimming operations. Equipped with multiple integrated hydraulic protection logics, it is applicable to heavy-load impact working conditions in mines:
Smooth Swing Drive with Bidirectional High Torque
It delivers balanced output torque in forward and reverse rotation with linear and soft start-stop performance without sudden jerk or shock during swing acceleration/deceleration. It meets frequent reversing requirements for heavy full-load earth-rock and hard rock loading, improving overall loading efficiency.
Built-In Parking Brake Lock Function
The brake automatically clamps and locks the output shaft during engine shutdown and idling to prevent downhill sliding and inertial drifting of the upper carriage. Brake release is controlled by pilot pressure to achieve reliable parking and eliminate safety risks of sliding.
Anti-Shock Protection via Bidirectional Relief Buffering Valves
Integrated relief buffer valves at inlet and outlet ports absorb instantaneous high-pressure impact at swing start/stop and limit position collision, cushion inertial loads and protect motor piston assemblies, swing ring gears and reducer gears from cracking under impact.
Anti-Cavitation Makeup Check Valve Circuit
Automatic oil replenishment during inertial swing prevents negative pressure cavitation caused by oil starvation that scratches valve plates and pistons, extending service life of internal friction pairs inside the motor.
Stable Operation Under Wide High-Low Temperature Conditions
Adaptable to continuous high-temperature operation in summer and cold start in winter mining environments. It features slight volumetric efficiency attenuation, resisting excessive internal leakage, vibration and overheating after prolonged frequent swinging.
III. Overall Structure & Material Classification of Key Components
1. Overall Structural Layout (From Port End to Output Shaft End)
Integrated valve block for inlet and outlet ports (dual buffer relief valve + makeup check valve) → Motor housing & valve plate assembly → Piston slipper assembly → Cylinder block assembly → Fixed swashplate mechanism → Main output shaft → Multi-disc friction parking brake assembly → Flange mounting spigot, drain port, brake control port, mounting bolt holes, reducer connecting spline
2. Material & Heat Treatment Process for Critical Components
Pistons, Cylinder Blocks, Valve Plates: High-toughness carburized bearing steel with overall carburizing quenching and ultra-precision mirror grinding; working surface hardness HRC60~64. Resistant to alternating high-pressure friction, impurity scratching and cavitation with high volumetric efficiency, suitable for mining environments with contaminated hydraulic oil.
Slippers, Retainer Plates: Quenched and tempered 40CrNiMo alloy steel with copper-based sintered wear-resistant lining embedded inside slippers, featuring minor reciprocating impact wear and extremely low internal leakage growth during long-term operation.
Swashplate Body: Integrally forged and tempered 42CrMo steel with surface quenching, featuring high structural rigidity to resist deformation under swing impact and guarantee stable piston movement trajectory.
Output Drive Main Shaft: High-strength quenched and tempered structural alloy steel with high-frequency quenched splines, resistant to torsional fatigue and heavy impact, not prone to torsional deformation and spline tooth damage.
Brake Friction Plate Assembly: Copper-based powder metallurgy friction substrate with excellent wear resistance and high-temperature resistance, stable braking torque, resisting disc burning and slipping failure under frequent start-stop cycles.
Valve Block Spool & Sleeve Pair: Precisely matched alloy steel treated by ion nitriding with micron-level fit clearance, sensitive response against sticking and stable buffering & pressure regulation accuracy.
Motor Housing: Integrally cast high-strength ductile iron with sufficient pressure margin, vibration damping and noise reduction, resisting hydraulic impact and eliminating oil leakage induced by high-pressure deformation.
Complete Sealing Assembly: Composite oil seals made of imported fluororubber and PTFE back-up rings, compatible with hydraulic oil ranging from -22℃ to +99℃, anti-aging and anti-extrusion to prevent leakage on end faces, shaft ends and oil ports.
Main Heavy-Duty Support Bearing Set: Matched tapered roller bearings plus thrust bearings to bear alternating axial and radial impact loads, ensuring stable high-speed rotation and prolonging overhaul intervals.
IV. Precise Technical Parameters
Theoretical Displacement: 250mL/r (fixed-displacement piston motor)
Rated Working Pressure: 33MPa, Instantaneous Peak Shock Pressure: 40MPa
Maximum Allowable Rotational Speed: 1520r/min
Rated Output Torque: High torque output matched with system pressure to satisfy heavy-load swing requirements for large-tonnage excavators
Brake Type: Internal spring-applied, hydraulically released multi-disc wet parking brake
Built-In Valve Group: Dual buffer relief valves, anti-cavitation makeup check valves
Applicable Hydraulic Oil Temperature Range: -22℃ ~ +99℃
Protection Class: IP54, dust-proof and splash-proof against muddy water intrusion
Oil Requirement: 46#/68# high-pressure anti-wear hydraulic oil for construction machinery, oil cleanliness required NAS Class 8 or better
Installation Form: Flange spigot positioning mounting, spline direct connection to two-stage planetary swing reducer
Net Weight of Assembly: 43.2kg
Structural Advantage: Compact integrated layout with internally installed valve groups eliminating external pipelines, fewer leakage points, compact engine compartment arrangement and superior impact resistance and durability compared with ordinary swing motors.
V. Core Product Advantages
1. Precise Interchangeability with Original Factory Part Code
With Sany material code 60201949 and model M5X250CHB-10A-46A/275, its mounting flange dimension, port orientation, brake port, output spline specification and bolt hole layout are 100% compatible with all designated models from SY485H to SY1350H. No pipeline modification or flange machining is needed for direct disassembly and replacement with zero assembly tolerance, matching original factory pressure calibration parameters of Sany swing system. It is also adaptable for retrofitting same-tonnage excavators of foreign brands available on the market.
2. Kawasaki M5X Mining-Reinforced Design with Impact & Fatigue Resistance
Developed specifically for frequent impact swing conditions of medium, large and ultra-large mining excavators, it features upgraded contamination resistance for piston friction pairs to solve common failures such as premature scratching, excessive internal leakage and insufficient swing power caused by contaminated mining hydraulic oil. Optimized start-stop buffering structure greatly reduces impact failure rate of ring gears and reducers, delivering longer service life under continuous long-term heavy-load operation.
3. Integrated Valve Group Structure for Greatly Reduced Failure Rate
Buffer valves, makeup valves and parking brakes are fully internally integrated, removing external pressure regulating pipelines and joints to cut leakage points. Stable brake logic prevents sliding during parking on slopes with smooth start-stop buffering, lowering risk of fatigue cracking of upper structural components induced by impact.
4. Excellent Reliability & Higher Safety Level of Braking System
Wet multi-disc spring brake structure automatically locks the swing upper structure upon power cut or engine shutdown to eliminate safety accidents caused by downhill sliding. Brake release pressure range complies with original whole-machine design, avoiding dragging overheating and swing jitter induced by incomplete brake release.
5. Modular Maintenance-Friendly Design with Controllable Repair Cost
Wearing parts including piston-cylinder overhaul kits, complete oil seal repair kits, brake friction plates, valve spools and bearings can be disassembled and replaced separately without replacing the entire motor assembly to cut overhaul expenditure. An independent drain detection port is reserved on the housing for convenient internal leakage inspection and rapid troubleshooting.
VI. Key Points for Installation & Replacement
- System Pressure Relief Preparation: Shut down the engine, repeatedly operate the swing lever to release residual high pressure inside the swing circuit, lock the swing upper structure, disconnect the negative terminal of the battery and implement safety protection measures for high-pressure hydraulic work.
- Disassembly of Pipelines: Remove motor high-pressure inlet/outlet hoses, brake control hose and housing drain pipeline in sequence, mark each pipeline to prevent reverse connection and clean dirt and impurities on pipe joints.
- Removal of Old Motor: Loosen motor flange fixing bolts and lift out the old motor assembly steadily with dedicated lifting tools. Clean oil stains and rust on the mating end face of the reducer and inspect the reducer input spline for collision, wear and tooth damage.
- Positioning Assembly of New Motor: Install brand-new sealing gasket on motor end face and apply oil-resistant sealant evenly. Align splines for smooth fitting and tighten mounting bolts evenly in diagonal multiple passes to prevent seal damage induced by eccentric load and shaft binding.
- Pipeline Reassembly: Restore all hydraulic hoses according to marks, replace all O-rings at joints with new ones and tighten pipe joints uniformly to eliminate potential leakage risks.
- Oil Filling, Air Bleeding & Running-In: Fill sufficient hydraulic oil into the motor through the drain port for air evacuation. Perform repeated left-right swing cycles at idle speed to purge air inside pipelines, conduct 30-minute no-load running-in and check end faces and ports for oil seepage, abnormal noise and vibration.
- Commissioning & Acceptance: Connect external pressure gauges to verify whether swing working pressure, buffer relief pressure and brake release pressure meet original factory standards. The installation is qualified if the swing operates smoothly during start-stop without sliding, vibration, impact and with sufficient rotating power.
VII. Common Faults, Causes & Operational Hazards
Insufficient Swing Power, Low Rotational Speed, Failed Pressure Build-Up
Causes: Excessive internal leakage from worn piston valve plate pairs, premature opening of buffer relief valve, insufficient oil suction due to clogged inlet port
Hazard: Sharp decline of loading efficiency after long-term operation, slipping during heavy-load swing and reduced overall machine productivity.
Severe Impact, Vibration, Abnormal Noise and Excessive Inertial Swinging During Swing Start & Stop
Causes: Stuck dual buffer valve with abnormal pressure regulation, excessive clearance from worn internal bearings, cavitation and scratching of pistons
Hazard: Continuous impact easily damages swing ring gears and reducer gears, resulting in high maintenance costs.
Oil Seepage & Leakage on Motor End Face, Ports and Shaft End
Causes: Aged & damaged seals, uneven torque of assembly bolts, deformed end face from collision, damaged oil seal induced by blocked drain pipeline
Hazard: Oil shortage and air intake aggravate internal dry abrasion, possibly leading to motor seizure and complete rotation failure in severe cases.
Sliding on Slopes, Parking Brake Failure, Spontaneous Slow Rotation After Shutdown
Causes: Worn & burnt brake friction plates, fatigue fracture of brake springs, stuck brake pressure relief spool
Hazard: Potential safety hazard of tipping caused by sliding, failing to meet operation specifications for slope working conditions.
Swing Sticking, Binding and Sluggish Single-Side Movement
Causes: Pistons jammed by sludge and impurities, cavitation induced by failed makeup check valve, incomplete brake release
Hazard: Uncomfortable operation feel, uncoordinated compound movements and increased operation difficulty.
Abnormally High Swing Oil Temperature & Overheated Motor Housing
Causes: Excessive internal motor leakage, brake dragging, long-term overflow pressure relief of buffer valve
Hazard: Accelerated deterioration of hydraulic oil and rapid aging of seals, with consequential damage to the entire swing transmission system.
VIII. One-Stop Supporting Supply List (Complete Spare Parts for Swing System)
- Same-model M5X250CHB-10A-46A/275 swing piston motor assembly and original Kawasaki replacement units
- M5X250 piston-cylinder overhaul kits and slipper & valve plate repair kits
- Complete oil seal repair kits, end face sealing gaskets and shaft seal assemblies for motor
- Spare parts for dual buffer relief valves, makeup check valves and brake valve spool & sleeve assemblies
- Wearing internal components including parking brake friction plates, brake springs and bearings
- Two-stage planetary swing reducer assembly, reducer gears, ring gears and planet carrier components
- Complete assembly of swing high-pressure hoses, brake hoses, pipe joints and sealing washers
- Swing bearing, swing center joint and swing pilot control valve assembly for SY485H/SY500H/SY550H/SY980H/SY1250H/SY1350H
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