Product name: Komatsu Hydraulic Cylinder Seal Kit
Part No: 144-63-05050 1446305050
Size：65MM / 110MM
Model Number:For D60 D75A-1
Material:Lron+Rubber
Packing:PP bag inside, carton box outside
Payment Terms:Western Union, L/C, T/T, MoneyGram, D/A, D/P
MOQ:Acceptable trial order
Shipping Mode:By air, by sea, by express(Fedex, UPS, DHL, TNT, etc.)
Place of Origin:Guangdong, China
Brand name:COGENG
CertifiCATEEion:ISO9001
Supply :500PCS
| Parameter | Value / Specification |
|---|---|
| Maximum Operating Pressure | Up to 2,500 PSI (172 bar) [Typical for Series] |
| Temperature Range | -20°F to 200°F (-29°C to 93°C) |
| Fluid Compatibility | Mineral-based hydraulic oils (SAE 10W-30 type), Anti-wear (AW) hydraulic fluids |
| Primary Seal Material | Polyurethane (AU), Nitrile Rubber (NBR) - Classic Formulation |
| Seal Hardness (Dynamic) | 88-92 Shore A (Polyurethane) |
| Seal Hardness (Static) | 70 Shore A (NBR O-Rings) |
| Design Standard | Manufactured to original Komatsu specifications for the D60-D75A-1 series. |
| Komatsu Dozer Model Series | Specific Application |
|---|---|
| Komatsu D60-1 (E, P, PL, S, W variants) | Blade Lift (Hoist) Cylinders |
| Komatsu D65-1 (E, P, S variants) | Blade Lift (Hoist) Cylinders |
| Komatsu D75A-1 | Blade Lift (Hoist) Cylinders |
| Note: | This kit is a direct replacement for Komatsu OEM part number 144-63-05050. It is designed specifically for the LIFT/HOIST CYLINDERS on the listed vintage dozer models. Verify your machine's exact model, serial number, and that you are servicing the LIFT CYLINDERS. |
| Component Name | Material | Color | Durometer | Function |
|---|---|---|---|---|
| Main Piston Seal (U-Cup/V-Packing) | Polyurethane (AU) / Leather* | Brown / Brown | 90 Shore A | Primary dynamic pressure seal on piston |
| Rod Seal (Step Seal / V-Packing Set) | Cast Polyurethane (CU) / Leather* | Black / Brown | 90 Shore A | Main rod seal for pressure retention |
| Wiper/Scraper | Polyurethane (PU) | Black | 85 Shore A | Excludes dirt and debris |
| O-Ring Kit (Assorted) | Nitrile Rubber (NBR) | Black | 70 Shore A | Static sealing for gland, end cap, ports |
| Wear Ring / Guide Band | Fabric-Reinforced Phenolic / Nylon | Brown / White | N/A | Centralizes piston, prevents metal contact |
| Backup Rings | Nylon / Leather Washers* | Tan / Brown | N/A | Prevents extrusion of seals |
*Note: Some original configurations in these vintage models may have used leather packing. This COGENG kit provides modern, superior polyurethane equivalents unless otherwise specified as a classic reproduction.
Installation decomposition diagram
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.
Critical Specific Warnings
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.
Frequently Asked Questions
A. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?
A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.
A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.
A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?
A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand
A: What's package? Can you give me the package according my requirement??Contact COGENG
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