HITACHI 2044037/9101204/4390412 EX1100/EX1200 Track Guide Wheel AS/Track Idler Assy-Supplied by DPW Machinery Parts
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Product Specifications
Technical Product Overview: HITACHI EX1100/EX1200 Track Guide Wheel & Idler Assembly (P/N 2044037, 9101204, 4390412) - Supplied by DPW Machinery Parts
Meta Description: Source HITACHI EX1100/EX1200 Track Guide Wheel & Idler Assy (P/N :2044037/9101204/4390412) from DPW Machinery Parts. We supply OEM-quality, heavy-duty undercarriage components engineered for durability and performance in severe applications.
1. Component Identification & Application
OEM Part Numbers: 2044037, 9101204, 4390412
Compatible Models: Hitachi EX1100 and EX1200 Series Crawler Excavators.
Component Names: Track Guide Wheel Assembly (Bottom Roller) / Track Idler Assembly (Front Idler)
Supplier: DPW Machinery Parts – Your global partner for reliable heavy equipment replacement components.
This listing covers two critical, interconnected undercarriage assemblies for large Hitachi excavators. These components are essential for the machine's mobility, stability, and overall undercarriage health.
Track Guide Wheel (IDLER ASSY): This component supports the excavator's immense weight on the lower track frame. Its double flanges guide the track chain, maintaining alignment and preventing derailment during travel and steering. It is subject to constant load and abrasive wear.
Track Idler Assembly (Front Idler): Located at the front of the undercarriage, the idler guides the track chain into a continuous loop. It is mounted on a adjustable tensioning mechanism (screw or hydraulic) to maintain proper track chain tightness, which is crucial for optimizing service life and travel performance. It also helps absorb forward impact shocks.
2. Technical Deep Dive: Design & Manufacturing Excellence
The components supplied by DPW Machinery Parts are manufactured to stringent quality standards to ensure performance parity with original parts.
A. Material Specification & Forging:
The roller and idler wheels are hot-forged from high-grade, high-carbon steel alloys such as 50Mn or 60Si2Mn. This forging process aligns the steel's grain flow with the component's shape, resulting in superior impact strength and fatigue resistance compared to cast parts.
Internal shafts and pins are machined from tough alloy steels like 42CrMo or 40Cr, hardened and ground to resist bending and shear forces.
B. Advanced Heat Treatment Process:
Core Toughness: The entire component undergoes Quenching and Tempering (Q&T), creating a tough, ductile core (approx. 30-40 HRC) that can absorb severe shock loads without catastrophic failure.
Surface Hardness: The critical wear surfaces—the rolling path and guide flanges—are treated with induction hardening. This process creates a deep, wear-resistant layer with a hardness of 58-62 HRC, providing exceptional resistance to abrasion in rock, sand, and other aggressive materials.
C. Sealing System (Multi-Stage Defense):
The service life of these assemblies is largely determined by their seal integrity. The supplied parts feature a robust, multi-stage sealing system:
Primary Seal: A spring-loaded, wear-resistant Nitrile (NBR) lip seal that provides the main barrier against contamination.
Labyrinth Seal: A complex, multi-path mechanical seal designed to trap and expel abrasive particles before they reach the primary seal.
Grease Barrier: The seal cavity is packed with high-temperature, waterproof grease, creating a positive pressure barrier that actively repels contaminants.
D. Lubrication & Service:
These are designed as sealed and lubricated-for-life assemblies. The internal bearing cavities are permanently lubricated during manufacture. External grease fittings are provided for the idler's tensioning function and for maintaining the outer seal barrier.
3. Common Failure Modes & Value Proposition
Using inferior undercarriage parts leads to premature failure and costly collateral damage. The components supplied by DPW Machinery Parts are engineered to prevent:
Accelerated Flange Wear: Combated by deep induction hardening.
Seal Failure & Bearing Contamination: Mitigated by the advanced multi-stage labyrinth seal.
Guide Wheel/Idler Seizure: Prevented through precise manufacturing tolerances and effective sealing, which maintains clean lubrication.
Core Cracking: Avoided due to the forged construction and proper core toughness from the Q&T process.
4. DPW Machinery Parts: Your Strategic Supply Partner
DPW Machinery Parts provides more than just components; we provide a solution for your fleet maintenance needs.
Guaranteed Compatibility: We ensure that the parts we supply, including the listed P/Ns 2044037, 9101204, and 4390412, are direct replacements for your Hitachi EX1100 and EX1200 excavators, ensuring perfect fit and function.
Quality Assurance: Our products are sourced from certified manufacturers who employ the advanced processes described above. We stand behind the durability and performance of every part we sell.
Global Logistics Network: We understand that downtime is costly. Our efficient supply chain and global shipping capabilities ensure you receive the parts you need, when and where you need them.
Cost-Effective Reliability: By offering high-quality aftermarket parts, we provide a significant total cost of ownership (TCO) advantage without compromising on performance or service life, protecting your valuable equipment investment.
