Komatsu PC400-6/7 Track Group/208-32-03540/52L/600MM-excavator undercarriage parts manufacture in china

Product Specifications

The Komatsu PC400-6 and PC400-7 Track Group (Undercarriage) refers to the complete assembly of components that allow the excavator to move and support its weight. It's a critical wear system requiring regular maintenance and eventual replacement.

Here's a breakdown of the key components in the PC400-6/7 track group:

1. Track Chains (Links & Pins/Bushings):

   • The foundation, consisting of alternating inner and outer links connected by pins and bushings.

   • Specification: Typically 600mm (23.6") shoe width is standard for these models. Pin diameter and pitch are critical specs.

   • Material/Quality: High-strength alloy steel, hardened for wear resistance. Quality directly impacts lifespan.

2. Track Shoes (Grousers):

   • Bolted onto the track chains. Provide traction and distribute weight over the ground.

   • Options: Available with different numbers of grousers (lugs):

     • Single Grouser: General purpose.

     • Double Grouser: Better traction in softer/muddy conditions.

     • Triple Grouser: Maximum traction in very soft ground, but more wear on hard surfaces.

   • Specification: Must match the chain pitch and link width (600mm).

3. Sprocket (Final Drive Sprocket):

   • Driven by the final drive motor, it engages with the track chain bushings to propel the machine.

   • Design: Segmented (individual rim sections) or solid. Segmented are more common for easier replacement of worn segments.

   • Wear: Must match the chain pitch and have the correct number of teeth. Worn sprockets accelerate chain wear (and vice versa).

4. Upper Carrier Rollers (Top Rollers):

   • Support the upper section of the track chain, keeping it aligned and preventing excessive bouncing.

   • Quantity: Usually 2 per side on machines of this size.

5. Lower Track Rollers (Bottom Rollers):

   • Support the weight of the machine on the lower track section and roll along the track chain links.

   • Quantity: Typically 7 or 8 per side for a PC400-sized machine. Can be single-flange or double-flange.

   • Design: Often sealed and lubricated (SALT - Sealed and Lubricated Track) for longer life in harsh conditions, though some may be dry.

6. Idler Wheels (Front Idlers):

   • Located at the front of the track frame. Guide the track chain and provide tension adjustment.

   • Adjustment: Connected to the track tensioning mechanism (grease cylinder). Proper tension is crucial for wear and performance.

   • Wear: Have a hardened wear surface to match the chain pins/bushings.

7. Track Adjuster (Tensioner Assembly):

   • Consists of a hydraulic grease cylinder and spring assembly that pushes the idler wheel forward to maintain proper track tension. Includes the recoil spring.

8. Track Frames (Undercarriage Frames):

   • The large structural beams that hold all the rollers, idlers, sprockets, and final drives. Not typically considered a "wear part" but crucial to the group's integrity.

Key Considerations for PC400-6/7 Track Group:

• Compatibility: While the PC400-6 and PC400-7 share many common undercarriage components due to similar weight and design, ALWAYS verify part numbers using your specific machine serial number. Minor variations exist.

• Wear Matching: For maximum lifespan, replace track chains, sprockets, and idlers together as a matched set. Replacing only one worn component accelerates wear on the new ones.

• Quality: Undercarriage is a major investment. OEM Komatsu parts offer guaranteed fit and performance but are premium priced. Quality aftermarket brands (Berco, ITM, Prowler, etc.) can offer excellent value and longevity if sourced from reputable suppliers.

• Application: Choose the right shoe type (single/double/triple grouser) for your predominant working conditions.

• Maintenance: Regular cleaning, inspection for cracks/wear, and maintaining correct track tension are vital for extending undercarriage life.

Where to Find Specifications & Parts:

1. Komatsu Parts Manual (PEN): The definitive source for OEM part numbers and diagrams specific to your serial number.

2. Reputable Undercarriage Suppliers: Major suppliers (often found online) have extensive cross-reference databases. Provide your machine model and serial number.

3. Komatsu Dealer: Your local dealer can provide quotes for OEM parts and often quality aftermarket options.

In summary: The Komatsu PC400-6/7 Track Group is a robust system designed for heavy-duty excavation. Understanding its components (chains, shoes, sprocket, rollers, idlers, adjuster) and the importance of wear matching, proper maintenance, and selecting the right configuration for your job is key to maximizing uptime and minimizing operating costs. Always identify parts using your specific machine serial number.