| Parameter | Specification | Testing Standard |
|---|---|---|
| Inner Diameter | 140.00mm (+0.025/-0.000mm) | ISO 286-2 |
| Outer Diameter | 155.00mm (+0.000/-0.015mm) | ISO 286-2 |
| Width/Height | 45.00mm (±0.10mm) | ISO 2768-mK |
| Wall Thickness | 7.50mm (±0.05mm) | ISO 2768-mK |
| Material Composition | CuSn12 Bronze (SAE 660) | ASTM B505 |
| Surface Treatment | PTFE-Impregnated (0.10mm depth) | Proprietary Process |
| Hardness | 85-95 HB (Brinell) | ASTM E10 |
| Tensile Strength | ≥ 310 MPa (44,960 PSI) | ASTM E8 |
| Yield Strength | ≥ 140 MPa (20,305 PSI) | ASTM E8 |
| Elongation | ≥ 20% | ASTM E8 |
| Coefficient of Friction | 0.08-0.12 (against chrome) | ASTM D1894 modified |
| PV Limit | 2.8 MPa·m/s continuous | ISO 13738 |
| Maximum Load | 45 kN (10,116 lbf) radial | ISO 12129-1 |
| Temperature Range | -40°C to +180°C (-40°F to +356°F) | ASTM D2000 |
| Thermal Expansion | 18.0 x 10⁻⁶/K | ASTM E228 |
| Oil Capacity | 15-20% by volume (porous layer) | ASTM B328 |
| Surface Finish | Ra 0.4µm (ID), Ra 1.6µm (OD) | ISO 1302 |
| Roundness | ≤ 0.005mm | ISO 1101 |
| Parallelism | ≤ 0.008mm | ISO 1101 |
| Feature | Specification | Benefit |
|---|---|---|
| Material Grade | SAE 660 Bronze (CuSn12) | Excellent wear resistance, good corrosion resistance |
| Manufacturing Process | Centrifugal casting + CNC machining | Optimal grain structure, precise dimensions |
| Oil Groove Pattern | Helical + circumferential grooves | Ensures even oil distribution, prevents dry spots |
| Surface Treatment | PTFE impregnation (0.10mm deep) | Reduces breakaway friction, provides dry lubrication backup |
| Installation Features | Split design with alignment marks | Easy installation without special tools |
| Quality Marks | Laser-etched part number & orientation | Ensures correct installation, traceability |
| Load Distribution | 120° optimized load zones | Maximizes bearing surface under typical side loads |
| Thermal Management | Integrated heat dissipation channels | Prevents thermal expansion issues |
| Characteristic | COGENG Premium | Standard OEM | Aftermarket Standard |
|---|---|---|---|
| Service Life | 8,000-10,000 hours | 5,000-7,000 hours | 3,000-5,000 hours |
| Load Capacity | 45 kN | 40 kN | 35 kN |
| Friction Coefficient | 0.08-0.12 | 0.12-0.18 | 0.15-0.25 |
| Wear Rate | 0.001mm/1,000h | 0.002mm/1,000h | 0.003mm/1,000h |
| Temperature Range | -40°C to +180°C | -30°C to +150°C | -20°C to +120°C |
| Equipment Type | Komatsu Models | Cylinder Application | Quantity per Cylinder | Notes |
|---|---|---|---|---|
| Hydraulic Excavators | PC300-6, PC300-7, PC300-8 | Boom Cylinder (Secondary) | 2 | Lower gland position |
| PC350-6, PC350-7 | Arm Cylinder | 1 | Gland assembly | |
| PC400-6, PC400-7 | Bucket Cylinder | 1 | High-cycle application | |
| Wheel Loaders | WA380-3, WA380-5 | Lift Cylinder | 2 | Upper and lower positions |
| WA420-3, WA420-5 | Tilt Cylinder | 1 | Gland assembly | |
| Crawler Dozers | D85EX-12, D85PX-12 | Blade Lift Cylinder | 1 | High side-load application |
| D155AX-5, D155AX-6 | Blade Tilt Cylinder | 1 | Moderate cycle rate | |
| Motor Graders | GD655-5, GD675-3 | Moldboard Lift Cylinder | 1 | Precision application |
| Original Part Number | COGENG Equivalent | Bushing Type | Load Rating | Special Features |
|---|---|---|---|---|
| KOM-707-52-91150 | CG-RB-140-P | Standard Premium | 45 kN | PTFE impregnated |
| 707-52-91150 | CG-RB-140-S | Standard | 40 kN | Oil grooves only |
| 707-52-91151 | CG-RB-140-HD | Heavy Duty | 50 kN | Reinforced design |
| 707-52-91152 | CG-RB-140-HT | High Temperature | 45 kN | Extended temp range |
| Application | Recommended Variant | Special Instructions |
|---|---|---|
| High Side Load | CG-RB-140-HD | Check alignment every 500 hours |
| High Temperature | CG-RB-140-HT | Monitor fluid temperature |
| Contaminated Environment | CG-RB-140-P | Increase wiper maintenance |
| High Cycle Rate | CG-RB-140-P | Check wear every 1,000 hours |
| Measurement | New Specification | Service Limit | Replacement Required |
|---|---|---|---|
| ID Wear | 140.00-140.03mm | 140.08mm | ≥140.10mm |
| Clearance Increase | 0.02-0.06mm | 0.10mm | ≥0.12mm |
| Out-of-Round | ≤0.005mm | 0.015mm | ≥0.020mm |
| Surface Scoring | None visible | ≤0.02mm depth | ≥0.03mm depth |
| NO | Number | Name | Qty |
| 707-00-03311 | CYLINDER ASS'Y | 2 | |
| 1 | 707-11-70190 | • CYLINDER | 1 |
| 2 | 07042-20108 | • PLUG | 1 |
| 3 | 707-76-40020 | • BUSHING | 1 |
| 4 | 707-29-70620 | • HAED.CYLINDER | 1 |
| 5 | 707-52-90150 | • BUSHING | 1 |
| CYL | 707-00-0A032 | ||
| 707-00-0A033 | |||
| 707-00-0A012 | |||
| 707-00-0A022 | |||
| 707-00-0H610 | |||
| 707-00-0H860 | |||
| 707-00-0H470 | |||
| 707-00-0H480 | |||
| 6 | 707-51-40030 | • PACKING,ROD | 1 |
| 7 | 198-63-75190 | • SEAL.DUST | 1 |
| 8 | 07179-12052 | • RING.SNAP | 1 |
| 9 | 07000-12065 | • O-RING | 1 |
| 10 | 07146-02066 | • RING,BACK-UP | 1 |
| 11 | 07000-12070 | • O-RING | 1 |
| 12 | 707-59-40091 | ROD.PISTON | 1 |
| 13 | 707-36-70270 | • PISTON | 1 |
| 14 | 707-44-70180 | • RING.PISTON | 1 |
| 15 | 07156-00710 | • RING.WEAR | 1 |
| 16 | 07165-13033 | • NUT | 1 |
| 17 | 707-51-40640 | RING BUFFER | 2 |
Materials Warranty: 24 months unlimited hours
Performance Warranty: 18 months or 4,000 operating hours
Installation Support: Technical guidance included
Failure Analysis: Available for warranty claims
Engineering Support: Available for application questions
Installation Guidance: Step-by-step technical assistance
Training: Bearing installation certification available
| Interval | Inspection Type | Acceptable Limits |
|---|---|---|
| 500 hours | Visual inspection | No visible wear, proper lubrication |
| 1,000 hours | Clearance check | ≤0.08mm rod-to-bushing clearance |
| 2,000 hours | Full measurement | All dimensions within service limits |
| Oil Change | Contamination check | No bronze particles in fluid |
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Excessive Play | Bushing wear | Measure and replace if beyond limits |
| Binding/Rough Operation | Misalignment | Check rod straightness and alignment |
| High Temperature | Insufficient clearance | Verify proper installation clearance |
| Metal Particles in Fluid | Bushing failure | Immediate inspection and replacement |
Which Komatsu excavator models use the 707-52-91150 rod bushing assembly?
A: This heavy-duty rod bushing assembly is designed for specific Komatsu excavator hydraulic cylinders requiring OEM part number 707-52-91150. Please verify compatibility with your machine model and cylinder part number before ordering.
Q2: What is the exact size of this rod bushing assembly?
A: This bushing features a precision 140mm bearing surface. Please confirm that this matches your cylinder rod diameter before purchasing.
Q3: Is this an OEM or aftermarket rod bushing?
A: It is an OEM-grade replacement assembly, manufactured to meet or exceed original Komatsu quality standards for dimensional accuracy, wear resistance, and durability.
Q4: What are the signs that I need to replace my rod bushing?
A: Common signs include excessive play in the cylinder rod, uneven wear on the rod surface, unusual noises during cylinder operation, and hydraulic fluid contamination from metal particles.
Q5: How do I purchase the COGENG 707-52-91150 rod bushing assembly?
A: Contact us with your Komatsu machine model and cylinder details for fitment verification, then order directly through our website or sales team for fast shipping.
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net Facebook: Excavator SolenoidValve
#ExcavatorWiringHarness #ExcavatorThrottleMotor #ExcavatorSolenoidValve #ExcavatorSealKit
