SH200A3DH258 hydraulic pump
6 day ago
Product details
SH200A3DH258 Hydraulic Gear Pump: Technical Analysis & User Guide
(Technical Breakdown & User-Oriented Guide in English)
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1. Pump Model Definition & Core Specifications
(1) Model Decoding & Key Parameters
• Model Nomenclature(e.g., SH200A3DH258):
• SH: Manufacturer code (e.g., SANY Heavy Industry or OEM supplier).
• 200: Theoretical displacement200 mL/rev(200 cm³ hydraulic oil output per revolution).
• A3: Version iteration (A3 = 3rd-generation upgrade, optimized for sealing and shock resistance).
• D: Mounting type (D =flange-mounted, compliant with SAE J744 standard).
• H258: Speed/pressure identifier (H =high-pressure variant, 258 may indicate 25.8 MPa rated pressure or 25.8mm shaft diameter).
• Key Performance Parameters:【表格】
Parameter Value Application Implications
Displacement 200 mL/rev Determines flow rate (e.g., 300 L/min at 1500 rpm).
Rated Pressure 25.8 MPa (258 bar) Suitable for heavy-duty applications (e.g., excavator travel motors, crane luffing systems).
Max Speed 3000 rpm Must match motor/engine rated speed (e.g., Cummins QSB6.7 diesel engine max 2600 rpm).
Volumetric Efficiency ≥90% (new pump) Reflects internal leakage (service required if <85%).
Fluid Compatibility Anti-wear hydraulic oil (ISO VG32~68) Prohibited for emulsions or water-glycol (corrosive to gears/bearings).
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2. Typical Applications & Failure Cases
(1) Core Application Fields
• Construction Machinery:
• Excavator travel drives, swing motor feed, hydraulic breaker auxiliary pumps.
• Example: SANY SY245H excavator uses twin gear pumps (main pump + pilot pump), with SH200A3DH258 potentially serving as the main pump for high-flow demands.
• Agricultural Machinery:
• Combine harvester hydraulic steering, baler roller drives.
• Industrial Equipment:
• Injection molding machine clamping units, CNC machine hydraulic clamps.
(2) Common Failure Modes & Diagnostics
【表格】
Failure Symptom Root Cause Diagnostic Method Solution
Flow Deficiency Worn gears (clearance >0.15mm), loose bushings Flow meter test (<180 L/min@1500rpm requires repair) Replace gear set, restore bushing interference fit
Abnormal Noise Bearing starvation, air ingestion, poor gear mesh Spectrum analysis (>85 dB(A) requires investigation) Replace SKF 6208 bearing, repair suction line seals
High Oil Temp. Insufficient cooling, excessive leakage, improper viscosity Infrared thermography (>80°C requires intervention) Add oil cooler, switch to VG46 anti-wear oil
Housing Fracture Overpressure operation, casting defects, low-temperature brittleness Ultrasonic flaw detection (internal porosity requires scrap) Replace with forged steel housing pump, add pressure relief valve
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3. Maintenance & Troubleshooting
(1) Daily Inspection Checklist
• Daily Checks:
• Oil level (must be within ±10mm of sight glass midline).
• Suction strainer pressure drop (≤0.2 MPa, replace filter if exceeded).
• Weekly Checks:
• Coupling alignment (radial deviation ≤0.1mm, angular deviation ≤0.5°).
• Leakage rate (≤5 drops/min at flange/shaft ends).
(2) Critical Component Lifecycle Management
【表格】
Component Replacement Interval (Hours) Pre-Failure Indicators Recommended Upgrade
Gear Set 8000~12000 Flow decay >15%, pitting on gear teeth Custom carburized/hardened gears (HRC58~62)
Lip Seal 2000~3000 Shaft end oil leakage, seal lip hardening Switch to FKM (fluorocarbon) lip seal
Breather Filter 500 Abnormal pump pressure, oil emulsification Replace with desiccant-equipped composite filter
(3) Typical Fault Resolution Process
Case: SH200A3DH258 Pump Output Flow Fluctuation (±20%)
1. Initial Inspection:
• Measure system pressure (observed needle vibration, indicating cavitation).
2. Root Cause Identification:
• Excessive suction line resistance (clogged suction strainer, 0.35 MPa pressure drop).
3. Solution:
• Replace with 10μm precision strainer (original: 25μm), increase suction line diameter to φ32mm.
4. Validation:
• Flow restored to 195 L/min@1500rpm, pressure fluctuation ≤5%.
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