| Parameter | Specification | Testing Standard |
|---|---|---|
| COGENG Part Number | COGENG-707-98-33500-HSK | Internal Quality Standard QS-519 |
| Replaces OEM Part No. | Komatsu 707-98-33500 | Direct OEM Replacement |
| Primary Seal Material | Polyurethane (PU) Grade 94A | ISO 6072 |
| Secondary Seal Material | Nitrile (NBR) with PTFE fill | ISO 6072 |
| Wiper Material | Polyurethane double-lipped | ISO 6194 |
| O-Ring Material | Nitrile (NBR) 70 Durometer | ISO 3601-1 |
| Wear Ring Material | PTFE-filled composite | ISO 6811 |
| Backup Ring Material | Nylon 6.6 | ISO 1874-1 |
| Temperature Range | -40°C to +110°C (-40°F to +230°F) | ISO 2230 |
| Pressure Rating | Up to 35 MPa (5075 PSI) | ISO 10766-1 |
| Fluid Compatibility | Komatsu Super Hydraulic Fluid, mineral oil, synthetic | ISO 6743-4 |
| Shelf Life | 5 years in original packaging | ISO 2230 |
| Component | Material | Size Specification | Quantity | Function |
|---|---|---|---|---|
| Main Piston Seal | Polyurethane | 100mm ID x 8mm width | 1 | Primary pressure sealing |
| Rod Seal | NBR with PTFE | 70mm ID x 6mm width | 1 | Dynamic rod sealing |
| Buffer Seal | Polyurethane | 100mm ID x 6mm width | 1 | Pressure peak protection |
| Wiper Seal | Polyurethane double-lipped | 70.5mm ID | 1 | Contaminant exclusion |
| Wear Bands | PTFE composite | 100mm OD x 6mm width | 2 | Piston guidance |
| O-Rings | Nitrile (NBR) | Various sizes AS568 | 7 | Static sealing |
| Backup Rings | Nylon 6.6 | Various sizes | 4 | Anti-extrusion support |
| Guide Rings | PTFE-filled fabric | 100mm OD x 6mm width | 2 | Bearing surface protection |
| Gland Gasket | NBR | 75mm OD x 2.5mm CS | 1 | Gland static seal |
| Model Series | Specific Models | Cylinder Applications | Year Range | Serial Number Prefix |
|---|---|---|---|---|
| Komatsu PC120 | PC120-6, PC120-7 | Boom, Arm, Bucket Cylinders | 2000-2005 | 7W1, 7W2 |
| Komatsu PC128 | PC128-2, PC128-3 | Main Hydraulic Cylinders | 2001-2006 | 7X1, 7X2 |
| Komatsu PC130 | PC130-6, PC130-7 | All Hydraulic Cylinders | 2002-2007 | 7Y1, 7Y2 |
| Komatsu PC138 | PC138-2, PC138-3 | Boom and Arm Cylinders | 2003-2008 | 7Z1, 7Z2 |
| Komatsu PC160 | PC160-6, PC160-7 | Swing Motor, Travel Motor | 2004-2009 | 8A1, 8A2 |
| Parameter | Specification | Tolerance | Application |
|---|---|---|---|
| Cylinder Bore | 100 mm | +0.10/-0.00 mm | Standard cylinder size |
| Rod Diameter | 70 mm | +0.00/-0.05 mm | Chrome-plated rod |
| Operating Pressure | 31.4 MPa (320 kg/cm²) | ±2% | System design pressure |
| Burst Pressure | 62.8 MPa (640 kg/cm²) | +10% | Safety margin |
| Fluid Temperature | -20°C to +80°C | N/A | Operating range |
| NO | Number | Name | Qty |
| KIT | 707-98-33500 | SERVICE KIT, SWING | 2 |
| CYL | 707-02-11510 | CYLINDER ASSY, SWING, R.H. | 1 |
| 707-02-11520 | |||
| 1 | 721-11-11881 | • CYLINDER, L.H. | 1 |
| 1 | 721-11-11891 | • CYLINDER, R.H. | 1 |
| 2 | 707-76-45580 | • BUSHING | 2 |
| 3 | 707-71-50200 | • PLUNGER | 1 |
| 4 | 707-34-18020 | • O-RING (KIT) | 1 |
| 5 | 707-29-11430 | • HEAD, CYLINDER | 1 |
| 6 | 07177-05030 | • BUSHING | 1 |
| 7 | 707-51-50211 | • PACKING, ROD (KIT) | 1 |
| 8 | 176-63-92240 | • SEAL, DUST (KIT) | 1 |
| 9 | 07179-12062 | • RING, SNAP | 1 |
| 10 | 07000-12110 | • O-RING (KIT) | 1 |
| 11 | 707-35-91610 | • RING, BACK-UP (KIT) | 1 |
| 12 | 07000-12115 | • O-RING (KIT) | 1 |
| 13 | 721-58-50951 | • ROD, PISTON | 1 |
| 14 | 707-76-50840 | • BUSHING | 1 |
| 15 | 707-36-11970 | • PISTON | 1 |
| 16 | 707-44-11280 | • RING, PISTON (KIT) | 1 |
| 17 | 707-39-11510 | • RING, WEAR (KIT) | 1 |
| 18 | 07000-13050 | • O-RING (KIT) | 1 |
| 19 | 07001-03050 | • RING, BACK-UP (KIT) | 2 |
| 20 | 707-71-10120 | • RING, CUSHION | 1 |
| 21 | 707-81-30080 | • COLLAR | 1 |
| 22 | 707-73-03010 | • RING, SNAP | 1 |
| 23 | 01310-00820 | • SCREW | 1 |
| Performance Parameter | Value | Test Method |
|---|---|---|
| Seal Service Life | 4,000 operating hours | ISO 7983 |
| Friction Coefficient | 0.08-0.12 | ASTM D1894 |
| Extrusion Resistance | 36 MPa sustained | ISO 1829 |
| Compression Set | <14% after 24h @ 100°C | ISO 815 |
| Abrasion Resistance | >55,000 cycles | ISO 4649 |
| Low Temperature Flexibility | -40°C pass | ISO 2929 |
Preventive Maintenance Schedule:
Visual inspection: Every 500 operating hours
Leakage check: Monthly or 250 hours
Performance monitoring: Daily operational checks
Fluid analysis: Every 2,000 hours
Complete cylinder inspection: Every 3,000 hours
Troubleshooting Common Issues：
External Leakage: Verify seal installation and rod surface condition (Ra < 0.4 μm)
Internal Leakage: Check piston seal integrity and cylinder bore wear
Slow Operation: Inspect for contamination or incorrect fluid viscosity
Jerky Movement: Check for air in system or damaged wear bands
Overheating: Verify proper lubrication and check for excessive friction
Warranty Period: 18 months or 3,000 operating hours
Quality Certifications: ISO 9001:2015, ISO 14001:2015
Testing Protocol: 100% dimensional and material verification
Material Traceability: Full batch tracking with material certifications
Technical Support: Expert assistance for installation and troubleshooting
Documentation: Complete installation guide with torque specifications
Q1: Which Komatsu excavator models use the 707-98-33500 boom swing LH seal kit?
A: This premium seal kit is designed for the left-hand (LH) boom swing cylinder on specific Komatsu excavator models requiring OEM part number 707-98-33500 (also listed as 7079833500). Please verify compatibility with your machine model and cylinder part number before ordering.
Q2: What does "Boom Swing LH" (Left-Hand) mean for this seal kit?
A: Boom Swing LH indicates this seal kit is specifically for the left-hand side boom swing cylinder. Right-hand boom swing cylinders require a different part number. Please confirm your application before purchasing.
Q3: What makes this a "premium" hydraulic cylinder seal kit?
A: The premium kit features advanced polyurethane seals and high-grade rubber compounds designed for extended service life, superior leak prevention, and reliable performance in extreme hydraulic pressures and boom swing applications.
Q4: Is this an OEM or aftermarket seal kit?
A: It is an OEM-grade premium replacement kit, manufactured to meet or exceed original Komatsu quality standards for sealing performance, durability, and precise fit.
Q5: How do I purchase the COGENG 707-98-33500 boom swing LH seal kit?
A: Contact us with your Komatsu excavator model and cylinder details for fitment verification, then order directly through our website or sales team for fast shipping.
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