- CN
| Parameter | Specification / Value |
|---|---|
| COGENG Part Number | CGK-707-99-52160 |
| Replaces OEM Number | 707-99-52160 (Komatsu) |
| Primary Shaft Seal Material | Fluoroelastomer (FKM/Viton®) |
| Static Seal & O-Ring Material | Hydrogenated Nitrile Rubber (HNBR) |
| Temperature Range (Continuous) | -25°C to +150°C (-13°F to +302°F) for FKM |
| Maximum Surface Speed | 15 m/s (for shaft seal application) |
| Pressure Rating | Up to 30 MPa (4,350 psi) for internal seals |
| Fluid Compatibility | Full range of hydraulic oils, synthetic fluids, and resistant to common additives. |
| Component Name | Material | Quantity per Kit | Key Function & Characteristic |
|---|---|---|---|
| Main Rotary Shaft Seal | Viton® (FKM) with Garter Spring | 1 | Primary dynamic seal for the motor output shaft. Prevents oil leak under high rotational speed. |
| Secondary Lip Seal | HNBR | 1 | Acts as a dust lip or secondary barrier on the shaft, protecting the main seal. |
| Motor Housing O-Rings | HNBR | 2-3 (Various sizes) | Large static seals for motor case halves or cover plates. |
| Port O-Rings / Seals | HNBR / Polyurethane | 4-6 | Seal the hydraulic pressure and return ports on the motor body. |
| Shaft Bushing Seal | PTFE Composite | 1 | Seals the interface between the shaft and bushing, handling eccentric movement. |
| Static Gaskets (if applicable) | Coated Steel or Rubber | As required | For sealing flat mating surfaces on motor covers or valve plates. |
| Back-up Washers | Hardened Plastic | As required | Prevent extrusion of soft seals under high pressure in groove applications. |
This seal kit is designed for the swing motor and/or travel motor (final drive motor) of specific Komatsu models. The exact application is highly model-specific.
| Model Series | Specific Models | Confirmed Motor Application |
|---|---|---|
| PC300/350 Series | PC300LC-6, PC300LC-7, PC350LC-6, PC350LC-7, PC350LC-8 | Swing Motor |
| PC400 Series | PC400LC-6, PC400LC-7, PC400LC-8 | Swing Motor |
| PC450/650 | PC450-6, PC450-7, PC650SE-7 | Travel Motor (Planetary Final Drive) |
| Dash 6, 7, 8 Generations | Various large and mid-size models | Swing or Travel Gearbox Input Motor |
| HB215, HB205 | HB215LC-1 | Hydraulic Hammer Circuit Motors |
Critical Application Note: The 707-99-52160 is a critical motor-specific kit. It is NOT for standard hydraulic cylinders. Always verify the motor model number (e.g., KMF, KVR series) or the specific seal shapes from the disassembled unit against this kit. Misapplication will lead to immediate failure.
Ultra-Clean Workspace: Motor seal installation requires a cleanroom-level environment. Use a dedicated, dust-free bench. Even a single abrasive particle can score the sealing surfaces and cause rapid failure.
Motor Identification: Before disassembly, tag the motor and its ports. Document the orientation of internal components (e.g., valve plates, cylinder blocks) with photos. These assemblies have precise clocking.
Specialized Tools: Use bearing pullers and installation sleeves designed for seals. NEVER pry out shaft seals with a screwdriver, as this will gouge the sealing bore. Use a dedicated seal removal tool.
Bore & Shaft Inspection: After disassembly, inspect the seal bore in the housing and the shaft surface for wear, grooves, or corrosion. A worn shaft will destroy a new seal in hours. A scored bore will never seal properly. Light defects can be polished; severe damage requires component replacement.
Correct Seal Direction: The main rotary shaft seal has a specific installation direction. The lip faces the fluid to be sealed (usually inward toward the oil chamber). Installing it backward guarantees an instant leak. The secondary dust lip usually faces the external environment.
Lubrication & Installation: Soak lip seals in clean hydraulic oil before installation. Lubricate the shaft and bore. Use an installation sleeve to guide the seal lip evenly over the shaft end to prevent cutting or folding the sealing lip.
Post-Rebuild Procedure: Prime the motor with clean hydraulic fluid before installation. Upon initial start-up, run the motor at low speed with no load for several minutes to allow seals to seat and distribute lubrication. Check for leaks immediately and monitor temperature.
