| Parameter | Value / Specification |
|---|---|
| Pressure Rating | Up to 5,000 PSI (345 bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Petroleum-based hydraulic oils, synthetic fluids, Komatsu-approved fluids |
| Primary Seal Materials | Polyurethane (AU/CU), Nitrile Rubber (NBR), PTFE composites |
| Seal Hardness | 90-94 Shore A (Dynamic Seals), 70 Shore A (Static Seals) |
| Manufacturing Standards | ISO 3601, AS568A, ISO 7425 |
| Quality Assurance | Manufactured to meet or exceed original Komatsu technical specifications |
| Komatsu Part Number | COGENG Replacement | Application |
|---|---|---|
| 707-98-61100 | 707-98-61100 | Hydraulic Cylinder Seal Kit |
| Note: | This kit is a direct replacement for Komatsu OEM part number 707-98-61100. The specific equipment application must be verified through Komatsu's official parts documentation or service manual. Always confirm compatibility with your specific machine model and cylinder type before purchase. |
| Component Name | Material Specification | Standard | Primary Function |
|---|---|---|---|
| Piston Seal | Premium Polyurethane | ISO 7425-1 | Main dynamic pressure seal |
| Rod Seal | Cast Polyurethane Composite | ISO 6547 | Primary rod sealing |
| Wiper/Scraper | Heavy-Duty Polyurethane | ISO 6195 | Contaminant exclusion |
| Wear Ring/Guide Band | Reinforced PTFE | - | Piston/rod guidance |
| O-Ring Set | Nitrile Rubber (NBR) | AS568A/ISO 3601 | Static sealing |
| Backup Rings | Engineering-Grade Nylon | - | Anti-extrusion protection |
| Special Seals | As per OEM design | - | Application-specific seals |
Machine Secure & Pressure Relief: Park the dozer on a firm, level surface. Lower the blade fully to the ground to relieve all hydraulic pressure. Engage the parking brake and block the tracks.
Cleanliness Protocol: Disassembly and assembly must be performed in an impeccably clean, dust-controlled environment. The abrasive nature of dozer work makes contamination control paramount.
Documented Disassembly: Carefully disassemble the tilt cylinder. Photograph and note the exact order and orientation of all components, especially the seal stack in the gland.
Critical Metal Inspection: Use precision tools to inspect the cylinder rod for any scratches, gouges, or corrosion. Check the cylinder bore (ID) for scoring, pitting, or excessive wear. Damaged metal components MUST be replaced prior to seal installation.
Lubricated Assembly: Soak all new elastomeric seals in clean hydraulic fluid. Lightly lubricate all seal grooves and sliding surfaces before installing new seals.
Proper Tool Use: Use seal installation tools (cone tools, picks, sleeves) to carefully install seals without cutting, stretching, or rolling them over sharp edges.
Torque to Specification: During reassembly, use a calibrated torque wrench. Adhere strictly to Komatsu's specified torque values and sequences for gland bolts or end caps.
APPLICATION VERIFICATION IS CRITICAL: Part number 707-98-34590 is used for tilt cylinders on specific dozer models. You must verify the exact machine model this kit is designed for using official Komatsu documentation. Using it on an incompatible model or cylinder type will cause failure.
METAL SURFACE CONDITION: This kit seals fluid between precision metal surfaces. It CANNOT repair a scored rod or a worn cylinder bore. Installation on damaged components will result in immediate, severe leakage.
EXTREME ABRASIVE ENVIRONMENT: Dozer tilt cylinders are constantly exposed to dirt. Absolute cleanliness during assembly is non-negotiable to prevent rapid abrasive seal wear upon startup.
BLADE SUPPORT HAZARD: The bulldozer blade must be fully lowered and supported by the ground. Never work on a cylinder that is under load or hydraulic pressure.
Complete seal set matching OEM configuration
All dynamic and static seals as specified
Wear components per original design
Necessary backup rings and support components
Note: Kit contents are configured to exactly match the component list and arrangement of the original Komatsu 707-98-41020 kit. Includes detailed installation diagram.
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