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Views: 0 Author: Site Editor Publish Time: 11-03-2025 Origin: Site
The upper control arm bushing serves as the pivotal connection between the suspension control arm and vehicle chassis, functioning as both a mounting point and vibration isolator. In the Volvo XC90’s sophisticated multi-link suspension architecture, the upper control arm bushing OEM number 30645847 plays an indispensable role in maintaining wheel alignment geometry, absorbing road shock, and isolating cabin noise and vibration (NVH).
Unlike rigid metallic connections, these engineered elastomeric components allow controlled articulation during suspension travel while maintaining precise positioning under lateral and longitudinal loads. When operating correctly, drivers experience responsive handling, minimal road harshness, and quiet cabin comfort. Degraded bushings compromise steering precision, accelerate tire wear, and transmit unpleasant vibrations directly into the passenger compartment.
1. Geometric Positioning
The bushing maintains the control arm’s spatial relationship to the chassis, preserving critical suspension geometry parameters including caster angle, camber curve, and anti-dive characteristics. Precision-molded void patterns allow controlled deflection in specific axes while restricting motion in others.
2. Vibration Isolation & NVH Management
Engineered rubber compounds absorb high-frequency vibrations from road texture before transmission to the chassis structure. The material’s viscoelastic properties convert mechanical energy into heat, preventing resonance in the 10-200 Hz range critical to passenger comfort.
3. Load Distribution
During cornering, braking, and acceleration events, bushings distribute concentrated forces from the control arm across larger chassis mounting surfaces, reducing stress concentrations and preventing localized fatigue failures.
4. Compliance for Ride Comfort
Controlled deflection characteristics smooth out sharp impacts from expansion joints, potholes, and irregular pavement, significantly improving ride quality compared to solid mountings.
Worn or degraded bushings manifest through multiple symptoms: - Wandering steering feel and delayed response - Clunking sounds over bumps or during direction changes - Accelerated inner/outer edge tire wear patterns - Increased cabin noise transmission - Visible wheel alignment deviation
The 30645847 upper control arm bushing employs a three-layer bonded construction:
Inner Steel Sleeve - Material: Cold-rolled steel, zinc-plated or geomet-coated - Function: Interfaces with control arm mounting bolt - Tolerance: ±0.05mm on critical diameters
Elastomeric Layer - Composition: Natural rubber (NR) or synthetic blends (EPDM, NBR, polyurethane) - Structure: Directionally-tuned void patterns for anisotropic stiffness - Bonding: Sulfur vulcanization creates chemical bonds to metal surfaces
Outer Housing - Material: Steel or aluminum alloy - Function: Presses into chassis mounting point - Surface: Knurled or textured for press-fit retention
Material Type | Shore A Hardness | Temperature Range | Oil Resistance | Typical Application |
Natural Rubber (NR) | 55-65 | -40°C to +80°C | Poor | Standard duty, temperate climates |
EPDM Synthetic | 60-70 | -50°C to +120°C | Fair | Extended temperature range |
Nitrile (NBR) | 65-75 | -35°C to +100°C | Excellent | Oil-prone environments |
Polyurethane | 75-90 | -40°C to +90°C | Good | Performance/heavy-duty applications |
Huami Premium | 60-70 | -45°C to +110°C | Excellent | All-climate OEM replacement |
Hebei Huami formulations incorporate specialized additives for UV stability, ozone resistance, and extended service life exceeding 150,000 km under typical operating conditions.
Lower Hardness (55-60 Shore A) - Benefits: Maximum vibration isolation, smooth ride quality - Drawbacks: Higher deflection, potential alignment shift under load - Recommendation: Sedans, highway-focused vehicles, comfort priority
Medium Hardness (65-70 Shore A) - Benefits: Balanced comfort and control, OEM-equivalent performance - Drawbacks: None for typical applications - Recommendation: Standard replacement for Volvo XC90 applications
Higher Hardness (75-85 Shore A) - Benefits: Minimal deflection, precise steering response, heavy load capacity - Drawbacks: Increased NVH transmission, firmer ride - Recommendation: Performance applications, frequently loaded vehicles, towing
Correct Formats: - 30645847 (Volvo OEM standard) - 306-458-47 (hyphenated variant) - 306 458 47 (spaced format)
Common Incorrect Spellings & Searches: - 3064-5847 (incorrect hyphenation) - 30645847A (erroneous suffix) - 30645487 (digit transposition) - 30645847 bushing (redundant descriptor)
Fitment Applications: - Volvo XC90 (2003-2014, P2 platform) - Position: Upper front control arm to chassis - Installation: Left and right sides (symmetric design) - Quantity required: 2 per vehicle (one per side)
Note: Always verify fitment against vehicle VIN and existing component measurement. Platform variations and mid-cycle changes may affect compatibility.
Dimension | Metric (mm) | Imperial (inch) | Tolerance |
Inner Sleeve ID | Ø15.0 | Ø0.591 | ±0.05mm |
Inner Sleeve OD | Ø22.0 | Ø0.866 | ±0.08mm |
Outer Housing ID | Ø42.0 | Ø1.654 | ±0.10mm |
Outer Housing OD | Ø52.0 | Ø2.047 | ±0.12mm |
Overall Height | 38.0 | 1.496 | ±0.15mm |
Press-Fit Depth | 45.0 | 1.772 | ±0.20mm |
Void Pattern Angle | 45° | 45° | ±2° |
1. Inner Diameter: Digital caliper measurement at room temperature (20±2°C)
2. Outer Diameter: Micrometer measurement with 5-7N force application
3. Height: Flat surface to flat surface with no load applied
4. Hardness Verification: Shore A durometer, 5-point average measurement
Hebei Huami maintains ±0.05mm tolerance on critical inner sleeve dimensions through precision CNC machining and 100% dimensional inspection.
Step 1: Assess Operating Conditions
Condition | Standard Grade | Heavy-Duty Grade | Performance Grade |
Urban/Highway (smooth roads) | ✓ Recommended | Optional | Not necessary |
Mixed terrain | ✓ Recommended | ✓ Recommended | Optional |
Off-road/unpaved | Standard acceptable | ✓ Recommended | ✓ Recommended |
Frequent towing (>1000kg) | Acceptable | ✓ Recommended | ✓ Recommended |
Performance driving | Not recommended | Acceptable | ✓ Recommended |
Step 2: Temperature Environment Evaluation
• Cold Climate (<-30°C frequent): Specify low-temperature EPDM compound
• Hot Climate (>40°C frequent): Verify heat-resistant formulation
• Temperate: Standard NR compound acceptable
• Extreme variation: Premium all-climate formulation recommended
Step 3: Contamination Exposure
Exposure Type | Standard NR | NBR Compound | Polyurethane |
Road salt | Acceptable | Better | Best |
Engine oil drips | Poor | Excellent | Good |
Brake fluid | Poor | Good | Fair |
Hydraulic fluid | Poor | Excellent | Good |
Diesel fuel | Poor | Excellent | Fair |
Step 4: Customer Profile Matching
• Fleet operators: Specify extended-life formulations with 200,000+ km rating
• Performance enthusiasts: Offer 75-80 Shore A variants with minimal deflection
• Budget-conscious retail: Standard 65-70 Shore A meets OEM specifications
• Heavy commercial: Custom reinforced versions available (MOQ: 500 pieces)
Load Condition Recommended Hardness Expected Service Life
────────────────────────────────────────────────────────────────────
Light duty (sedan) 55-60 Shore A 120,000-150,000 km
Standard (XC90 stock) 65-70 Shore A 150,000-180,000 km
Heavy duty (frequent 75-80 Shore A 180,000-220,000 km
load/towing)
Performance/track 80-85 Shore A 100,000-130,000 km
(accelerated wear)
• Hydraulic press or suitable bushing removal/installation tool set
• Torque wrench (calibrated, 50-250 Nm range)
• Thread-locking compound (medium strength, e.g., Loctite 243)
• Rubber lubricant or soapy water solution (no petroleum products)
• Dial indicator for alignment verification (optional, recommended)
Phase 1: Removal of Old Bushing
1. Vehicle Preparation
– Raise vehicle on lift or safety stands
– Remove wheel and gain access to upper control arm
– Support control arm with jack stand before disconnecting
2. Control Arm Disassembly
– Disconnect upper ball joint (typically 70-80 Nm torque)
– Remove control arm mounting bolts (typically 90-110 Nm)
– Extract control arm from vehicle
3. Bushing Extraction
– Identify press-in direction (note any directional features)
– Use hydraulic press with appropriate drift/adapter
– Apply force gradually to avoid control arm distortion
– Maximum press force: 8-12 tons (typical for steel housing)
Phase 2: Installation of New Bushing (30645847)
4. Component Preparation
– Inspect control arm mounting bore for damage/corrosion
– Clean bore thoroughly with wire brush and solvent
– Apply thin rubber lubricant layer to outer housing
5. Press-Fit Installation
– Align bushing orientation (if directional voids present)
– Position control arm in press with adequate support
– Press bushing until fully seated (measure against specification)
– Critical: Press force should be smooth; sudden resistance indicates misalignment
6. Verification
– Measure exposed inner sleeve length: should be symmetric
– Check for rubber extrusion beyond housing (indicates over-compression)
– Verify no gaps between bushing housing and control arm
Phase 3: Reinstallation & Torque Application
7. Control Arm Mounting
– Position control arm into chassis mounting points
– Insert mounting bolts with thread-lock compound
– Do NOT fully torque at this stage
8. Ball Joint Connection
– Reconnect upper ball joint to steering knuckle
– Torque ball joint nut: 75 Nm ± 5 Nm
– Install cotter pin or locking device per OEM specification
9. Critical: Load-Position Torquing
– Lower vehicle until suspension is at normal ride height
– Bounce suspension several times to settle components
– Final torque on control arm bolts: 100 Nm ± 8 Nm
– This sequence prevents bushing pre-load and premature failure
10. Post-Installation Verification
– Perform wheel alignment check (essential)
– Road test for noise, vibration, steering response
– Re-torque after 100-200 km: retorque to 100 Nm
Fastener | Initial Torque | Re-torque (100-200km) | Notes |
Upper ball joint nut | 75 Nm ± 5 Nm | Not required | Use new cotter pin |
Control arm mounting bolts | 100 Nm ± 8 Nm | 100 Nm | At ride height only |
Wheel lug nuts | 120 Nm ± 10 Nm | Not required | Star pattern torquing |
Error 1: Torquing with Suspension Unloaded - Consequence: Bushing rubber pre-twisted, accelerated wear, potential tearing - Prevention: Always torque with vehicle at ride height
Error 2: Using Petroleum-Based Lubricants - Consequence: Rubber compound degradation, premature failure - Prevention: Only use water-based lubricants or specialized rubber assembly paste
Error 3: Excessive Press Force - Consequence: Control arm bore distortion, bushing housing deformation - Prevention: Monitor press force; maximum 12 tons for steel housing designs
Error 4: Skipping Wheel Alignment - Consequence: Tire wear, handling issues, customer complaints - Prevention: Always perform post-installation alignment verification
Error 5: Reusing Fasteners Without Thread-Lock - Consequence: Bolt loosening, joint separation, safety hazard - Prevention: Apply medium-strength thread-locking compound to all reinstalled bolts
Symptom | Probable Cause | Diagnostic Test | Solution |
Clunking over bumps | Worn bushing rubber, separated bond | Visual inspection for cracks, squeeze test for voids | Replace bushing |
Steering wander | Excessive bushing deflection | Check for control arm play with pry bar | Replace with higher durometer bushing |
Vibration at 80-100 km/h | Bushing/wheel imbalance | Road test, swap wheels | Verify wheel balance, check bushing installation |
Tire inner edge wear | Camber/caster misalignment | Alignment measurement | Replace bushing, perform alignment |
Squeaking during turns | Dry bushing, inadequate lubrication | Listen during slow maneuvers | Typically normal; verify no cracks |
Visible rubber cracks | Age hardening, UV degradation | Visual inspection | Replace bushing, inspect others |
Oil-soaked bushing | Swelling from contamination | Measure bushing dimensions vs. specification | Replace with NBR compound version |
Harsh ride quality | Over-stiff bushing specification | Review hardness vs. application | Replace with correct durometer |
Bushing Deflection Test 1. Mount dial indicator against control arm 2. Apply known force (50 kg) perpendicular to control arm axis 3. Measure deflection; compare to specification (typically 1.5-3.0mm for 65 Shore A) 4. Excessive deflection (>4mm) indicates worn bushing
Bond Integrity Inspection 1. Remove control arm from vehicle 2. Apply rotational torque to inner sleeve while observing rubber-to-metal interface 3. Visible separation or rubber tearing indicates bond failure 4. Replace immediately; bond failures accelerate rapidly
Material Verification - Incoming rubber compound testing: hardness, tensile strength, elongation at break - Chemical composition analysis via FTIR spectroscopy - Batch traceability through entire production process
Dimensional Inspection - 100% automated optical inspection of critical dimensions - Statistical process control (SPC) with Cpk ≥ 1.67 target - Random manual verification sampling (minimum 5% of production)
Performance Testing - Radial/axial stiffness measurement on production samples - Durability testing: 500,000 cycles at ±8° oscillation, 50 Hz - Temperature exposure: -40°C for 72 hours, then +100°C for 72 hours - Salt spray corrosion resistance: 500 hours per ASTM B117
Quality Certifications - IATF 16949:2016 (automotive quality management) - ISO 9001:2015 (quality management systems) - ISO 14001:2015 (environmental management) - TÜV product certification (selected applications)
Each production batch includes: - Material certification from compound supplier - Dimensional inspection reports (with measurement data) - Hardness testing results (5-point sampling) - Cure process parameters (temperature, pressure, time) - Date code and batch number laser-etched on metal components
Hebei Huami maintains records for 15 years and provides full traceability documentation for warranty claims or quality investigations.
Established: 1998 (27 years of elastomeric component expertise)
Facility: Located in Xingtai Renze Economic Development Zone, Hebei Province
Certifications: IATF16949, ISO9001, ISO14001, AS9100D, GJB9001C
Listing: Beijing Stock Exchange (Stock Code: 836247)
Designation: National “Specialized, Refined, Differential, and Innovative” Key Little Giant Enterprise
Technical Capabilities: - 100+ R&D engineers with advanced degrees - 47 authorized patents (19 invention patents, 28 utility model patents) - Provincial-level Enterprise Technology Center - Hebei Special Rubber and Plastic Materials Research Laboratory
Production Scale: - 600+ employees dedicated to precision elastomeric components - Annual output value: 416 million RMB (2024) - Export capability: 70+ million RMB indirect exports annually - AEO certification: China Customs Advanced Certified Enterprise (2024)
Quality Infrastructure: - Complete R&D to finished product manufacturing capability - Advanced mixing equipment for compound customization - Automated injection/compression molding cells - In-house testing laboratory with environmental chambers
Supply Chain Advantages: - MOQ: 200 pieces (for standard specifications) - Custom formulation MOQ: 500 pieces - Lead time: 15-25 days for stock items, 30-45 days for custom compounds - Global shipping: CIF/DDP terms available for major ports
Hebei Huami provides: - Free sample evaluation program (customer pays shipping) - Technical consultation for hardness/compound selection - Custom formulation development for unique operating conditions - Installation training and troubleshooting support - Warranty: 24 months / 80,000 km (whichever occurs first)
Client: Multi-brand aftermarket distributor, Germany
Challenge: Frequent customer returns due to premature bushing failure in high-mileage Volvo applications
Solution: Hebei Huami conducted failure analysis, identified oil contamination as root cause, reformulated with NBR compound
Result: Return rate reduced from 8.3% to 0.7%; distributor expanded partnership to include 200+ additional SKUs
Expand Your Volvo Catalog with Confidence
Hebei Huami’s 30645847 upper control arm bushing offers your customers OEM-equivalent performance with competitive pricing that improves your margin. Our IATF16949 certification and comprehensive testing protocols ensure consistent quality that protects your reputation.
Solve Suspension Complaints Permanently
Stop callbacks and warranty returns with bushings engineered to exceed OEM durability standards. Hebei Huami’s advanced compound formulations resist oil contamination, temperature extremes, and aggressive driving conditions that defeat inferior aftermarket parts.
Custom Engineering for Demanding Conditions
Our R&D team can formulate custom compounds and modify void patterns for unique applications including racing, heavy towing, and extreme climate operation. With our in-house compounding capability and experienced engineering staff, we deliver solutions that off-the-shelf components cannot match.
Q1: What is the expected service life of the 30645847 upper control arm bushing?
A: Under normal operating conditions (mixed highway/urban driving, proper installation), expect 150,000-180,000 km service life. Heavy-duty applications (frequent towing, off-road use) may reduce this to 120,000-150,000 km. Service life is significantly influenced by installation technique—particularly torquing at ride height.
Q2: Can I replace just one upper control arm bushing, or must both sides be replaced simultaneously?
A: While technically possible to replace only one side, best practice recommends replacing both left and right simultaneously. Mismatched wear characteristics can create subtle handling imbalances and complicate wheel alignment. The modest additional cost is justified by balanced performance and labor efficiency.
Q3: How do I identify if oil contamination requires NBR compound instead of standard rubber?
A: Visual inspection reveals oil-swollen rubber (enlarged dimensions, softened texture, darkened appearance). If vehicle history includes engine oil leaks, hydraulic fluid leaks, or frequent undercarriage contamination, specify NBR compound proactively. Measure existing bushing outer diameter; if 2-3mm larger than specification, swelling has occurred.
Q4: What causes the squeaking noise sometimes heard during slow-speed turning?
A: Light squeaking is often normal rubber-on-metal friction during articulation and does not indicate failure. However, loud or persistent squeaking may indicate inadequate initial lubrication during installation, incorrect bushing orientation, or contamination between rubber and housing. Verify no petroleum-based lubricants were used during installation.
Q5: Is wheel alignment mandatory after replacing upper control arm bushings?
A: Yes, absolutely mandatory. Even with precise installation, minor variations in bushing positioning affect camber and caster angles. Skipping alignment verification leads to accelerated tire wear and may create handling irregularities. This is a false economy that typically costs more in premature tire replacement than the alignment service.
Q6: Can polyurethane bushings be used for street-driven Volvo XC90 vehicles?
A: Polyurethane bushings (typically 75-90 Shore A) are suitable for performance-oriented applications but compromise ride comfort through increased NVH transmission. For daily-driven vehicles prioritizing comfort, polyurethane is generally not recommended. Reserve polyurethane for track-focused vehicles or heavy-duty towing applications where minimal deflection justifies the comfort trade-off.
Q7: How does temperature affect bushing performance and selection?
A: Rubber compounds exhibit temperature-dependent stiffness. Below -20°C, standard NR compounds harden significantly, potentially causing harsh ride and reduced articulation. Above +80°C, accelerated aging occurs. For extreme climates, specify EPDM compounds with extended temperature range (-50°C to +120°C) to maintain consistent performance year-round.
Q8: What minimum order quantity (MOQ) does Hebei Huami require for custom formulations?
A: Standard catalog items (including 30645847): 200 pieces MOQ. Custom compound formulations: 500 pieces MOQ. Custom geometric designs: 1,000 pieces MOQ. For evaluation purposes, sample quantities (5-10 pieces) are available at setup cost plus piece price. Volume discounts begin at 500 pieces with additional tiers at 1,000 and 2,000+ pieces.
Q9: How can I verify authentic Hebei Huami components versus counterfeit products?
A: Authentic Hebei Huami bushings feature laser-etched date codes and batch numbers on metal components, consistent rubber finish without voids or flash, and precise dimensional tolerances. We provide certificate of conformance with material specifications and testing data for each order. Request verification through our anti-counterfeiting hotline if authenticity is questioned.
Q10: What warranty coverage does Hebei Huami provide?
A: Standard warranty: 24 months or 80,000 km from installation date (whichever occurs first). Warranty covers manufacturing defects including bond separation, dimensional non-conformance, and premature material degradation. Warranty excludes damage from improper installation, vehicle accidents, contamination exposure beyond specification, or operation outside temperature ratings. Full warranty terms provided with each shipment.
