| Parameter | Value / Specification |
|---|---|
| Maximum System Pressure | Up to 5,075 PSI (350 bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Mineral-based hydraulic oils, Komatsu Super Hydraulic Fluid (KSHV), biodegradable fluids |
| Primary Seal Material | Polyurethane (AU) & Nitrile Rubber (NBR) |
| Seal Hardness (Dynamic) | 90-92 Shore A (Polyurethane) |
| Seal Hardness (Static) | 70 Shore A (NBR O-Rings) |
| Performance Standard | Manufactured to meet Komatsu DHTA (Dantotsu High-Tech Advance) quality and performance specifications. |
| Komatsu Machine Models | Applicable Cylinder |
|---|---|
| Komatsu PC210LC-8 | Boom Cylinder |
| Komatsu PC220LC-8 | Boom Cylinder |
| Note: | This kit is a direct replacement for Komatsu OEM part number 707-52-10410. It is designed specifically for the boom cylinder on the listed machine models. Always verify the machine model, serial number, and cylinder identification (Boom) before installation. |
| Component Name | Material | Color | Durometer | Function |
|---|---|---|---|---|
| Piston Seal (U-Cup) | Polyurethane (AU) | Brown | 92 Shore A | Main dynamic pressure seal on piston |
| Rod Seal (Step Seal) | Cast Polyurethane (CU) | Black | 90 Shore A | Primary rod seal for pressure retention |
| Wiper/Scraper (Double Lip) | Polyurethane (PU) | Black | 88 Shore A | Excludes contaminants, secondary wiping |
| Buffer Ring | Polyurethane (CU) | Black | 88 Shore A | Protects rod seal from pressure surges |
| O-Ring Set (Assorted) | Nitrile Rubber (NBR) | Black | 70 Shore A | Static seals for gland, ports, and plugs |
| Wear Ring / Guide Band | Glass-Filled PTFE | Brown | N/A | Guides piston, prevents metal-to-metal contact |
| Backup Rings | Nylon 6.6 | Tan/White | N/A | Prevents O-ring extrusion under high pressure |
| NO | Number | Name | Qty |
| 707-00-0A031 | CYLINDER ASS'Y | 2 | |
| 1 | 707-11-75321 | • CYLINDER | 1 |
| 2 | 114-63-55170 | • BUSHING | 1 |
| 3 | 04065-06220 | • RING,SNAP | 2 |
| 4 | 07020-00900 | • FITTING,GREASE | 1 |
| 5 | 707-29-75831 | • HEAD,CYLINDER | 1 |
| 6 | 707-52-10410 | • BUSHING | 1 |
| 707-52-10710 | |||
| 7 | 707-51-40210 | • PACKING,ROD (KIT) | 1 |
| 8 | 198-63-75190 | • SEAL,DUST (KIT) | 1 |
| 9 | 07179-12052 | • RING,SNAP | 1 |
| 10 | 07000-12070 | • O-RING (KIT) | 1 |
| 11 | 707-35-52760 | • RING,BACK-UP (KIT) | 1 |
| 12 | 07000-12075 | • O-RING (KIT) | 1 |
| 13 | 721-58-40930 | • ROD,PISTON | 1 |
| 14 | 114-63-55170 | • BUSHING | 1 |
| 15 | 04065-06220 | • RING,SNAP | 2 |
| 16 | 07020-00900 | • FITTING,GREASE | 1 |
| 17 | 707-36-75370 | • PISTON | 1 |
| 18 | 707-44-75180 | • RING,PISTON (KIT) | 1 |
| 19 | 707-39-75190 | • RING,WEAR (KIT) | 1 |
| 20 | 707-67-30030 | • NUT | 1 |
| 21 | 02896-11009 | • O-RING (KIT) | 2 |
| 707-98-22850 | SERVICE KIT | 2 |
Safe Depressurization & Support: Park the excavator on level ground. Fully lower the boom and bucket to the ground to relieve all hydraulic pressure. Mechanically secure the boom or cylinder rod to prevent any movement.
Clean Workspace: Perform disassembly and assembly in a meticulously clean, dust-controlled environment. Use a parts washer and lint-free cloths.
Documented Disassembly: Carefully disassemble the cylinder gland. Photograph and label each component and its orientation during removal.
Mandatory Metal Inspection: Thoroughly inspect the cylinder rod for scratches, pitting, or scoring. Inspect the cylinder bore (ID) for wear, tapering, or damage. Replace any damaged metal components before installing new seals.
Proper Seal Installation: Lubricate all new elastomeric seals with clean hydraulic fluid. Use dedicated seal installation tools (cone tools, sleeves) to guide seals over threads and sharp edges without cutting or rolling.
Precision Reassembly: Follow the included diagram for correct seal order and orientation. Ensure all seals are fully and squarely seated in their grooves.
Torque Specifications: Use a calibrated torque wrench. Adhere strictly to Komatsu's specified torque values and sequences for gland bolts, tie-rods, or end caps.
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