- CN
| Parameter | Value / Specification |
|---|---|
| Maximum Operating Pressure | Up to 4,060 PSI (280 bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Mineral-based hydraulic oils, Komatsu Super Hydraulic Fluid (KSHV), BIO HFDU fluids |
| Primary Seal Material | Polyurethane (AU), Cast Polyurethane (CU), Nitrile Rubber (NBR) |
| Seal Hardness (Dynamic) | 92-95 Shore A (Polyurethane) |
| Seal Hardness (Static) | 70 Shore A (NBR O-Rings) |
| Design Standard | Manufactured to meet or exceed Komatsu's original specifications for pressure holding, extrusion resistance, and service life in heavy ripping applications. |
| Komatsu Dozer Model | Specific Application |
|---|---|
| Komatsu D60P-12 | Ripper (Scarifier) Lift & Pitch Cylinders |
| Komatsu D60E-12 | Ripper (Scarifier) Lift & Pitch Cylinders |
| Komatsu D63E-12 | Ripper (Scarifier) Lift & Pitch Cylinders |
| Note: | This kit is a direct replacement for Komatsu OEM part number 707-98-52130. It is designed specifically for the RIPPER CYLINDERS on the listed -12 series dozer models. Verify your machine's model, serial number, and that you are servicing the RIPPER CYLINDERS, not the blade or tilt cylinders. |
| Component Name | Material | Color | Durometer | Function |
|---|---|---|---|---|
| Main Piston Seal (U-Cup) | Polyurethane (AU) | Brown | 95 Shore A | Primary high-pressure dynamic seal on piston |
| Rod Seal (Step Seal) | Cast Polyurethane (CU) | Black | 94 Shore A | Main rod seal for pressure retention |
| Wiper/Scraper (Heavy-Duty) | Polyurethane (PU) | Black | 92 Shore A | Excludes abrasive soil, rocks, and debris |
| Buffer Ring | Polyurethane (CU) | Black | 92 Shore A | Dampens pressure spikes during ripping engagement |
| O-Ring Kit (Assorted) | Nitrile Rubber (NBR) | Black | 70 Shore A | Static sealing for gland, end cap, and ports |
| Wear Ring / Guide Band | Glass-Filled PTFE | Dark Brown | N/A | Centralizes piston, absorbs side loads, prevents metal contact |
| Backup Rings | Nylon 6.6 | Tan | N/A | Prevents extrusion of static O-rings under extreme pressure |
| Gland Seal | Nitrile / PTFE Composite | Black/Brown | As specified | Specialized sealing for ripper cylinder gland |
Main Piston Seal (U-Cup) – Qty: 1
Rod Seal (Step Seal) – Qty: 1
Wiper/Scraper (Heavy-Duty) – Qty: 1
Buffer Ring – Qty: 1
Wear Ring (Piston) – Qty: 1
Gland Seal Set – Qty: As required
Complete O-Ring & Backup Ring Set – Qty: 1 Set (All necessary sizes for gland, port, and fitting assembly)
Note: This kit provides a complete seal profile set designed to match the exact specifications of the original Komatsu 707-98-52130 ripper cylinder kit. An exploded diagram is included for correct assembly.
Full set of precision-molded static O-rings for all gland and port connections
Essential wear guide band to ensure smooth piston travel and minimize side load on seals
High-pressure nylon backup rings for critical O-ring applications
Excluded Items: This is a seal and wear component kit only. It does NOT include the piston, cylinder rod, barrel, gland nut, bearings, bolts, pins, ripper shanks, or any other metal parts or hardware.
Machine Secure & Pressure Relief: Park the dozer on firm, level ground. Lower the ripper assembly fully to the ground to relieve all hydraulic pressure. Engage the parking brake and block the tracks securely.
Cleanliness Protocol: Disassembly and assembly must be performed in an impeccably clean environment. Ripper cylinders are exposed to extreme abrasive contaminants; cleanliness is absolutely critical for seal longevity.
Documented Disassembly: Carefully disassemble the ripper cylinder. Photograph and note the exact order and orientation of all components, especially the complex seal stack in the gland.
Critical Metal Inspection: Use precision tools to inspect the cylinder rod for any scratches, gouges, or corrosion from soil contact. Check the cylinder bore (ID) for scoring, pitting, or excessive wear. Damaged metal components MUST be reconditioned or 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.
System Testing: After assembly, perform a controlled pressure test to validate seal integrity before returning the machine to service.
