FR510/FR485/SWE500 Track Tensioning Assembly Source factory and manufacture-DPW PARTS supply high quality undercarriage parts

Product Specifications

DPW PARTS' SWE500 Track Tensioning Assembly is a critical aftermarket replacement component that restores the core function of maintaining track tension and absorbing shocks on large excavators. When sourced from a reputable manufacturer, it provides a cost-effective and reliable solution for undercarriage maintenance and repair.

1. Terminology Breakdown

• SWE500: This is the manufacturer's part number prefix. It identifies this specific assembly and is used for ordering. It is not a machine model. The "500" often correlates with the machine size (e.g., 50-ton excavator) but this is not a universal rule.

• Track Tensioning Assembly: This is the precise English term for 涨紧总成. It describes the entire unit responsible for maintaining correct track tension.

2. Function and Critical Role

The Track Tensioning Assembly is a vital safety and performance component of an excavator's undercarriage. Its primary functions are:

1. Maintain Optimal Track Tension: It pushes the front idler wheel forward to keep the track tight. Correct tension is crucial:

   • Too Loose: The track can derail ("throw a track"), cause excessive wear on links and rollers, and create a slapping sound during operation.

   • Too Tight: Accelerates wear on the undercarriage (rollers, idlers, sprockets, and the track chain itself), increases fuel consumption, and puts excessive stress on the assembly.

2. Absorb Shock: It acts as a shock absorber, dampening impacts from obstacles and uneven terrain, protecting the entire undercarriage and mainframe.

3. Facilitate Maintenance: Allows mechanics to easily adjust tension and, when fully retracted, provides the slack needed to remove the track for repairs.

3. Key Components of the Assembly

A complete "assembly" or "总成" typically includes all the major wear parts pre-assembled or kit-form. The SWE500 likely includes:

• Tensioning Cylinder: The core component. A hydraulic or greased cylinder that extends and retracts to adjust the idler's position.

• Belly Drum (Housing): The robust, barrel-shaped housing that contains the cylinder and piston. This is often the part that bolts directly to the machine's mainframe.

• Piston: The internal component that is pressurized by grease and pushes against the idler yoke.

• Idler Yoke (or Carrier): The forged or cast bracket that connects the tensioning assembly to the front idler wheel. It moves back and forth as the assembly adjusts.

• Seal Kits: Crucial internal seals (O-rings, gland seals) that keep the grease in and contaminants out. A failure here is a common reason for replacement.

• Mounting Hardware: Bolts, nuts, and sometimes shims required for installation.

4. Compatibility & Machine Application

The "SWE500" number is specific to the manufacturer (e.g., a company like SWE Parts or another undercarriage specialist). It is absolutely critical to cross-reference this number.

• This assembly is designed to be a direct replacement for the OEM part on certain machine models.

• It is most commonly associated with 50-ton class excavators from manufacturers like:

  • FR510

  • FT485

• Verification is Mandatory: You must provide the aftermarket supplier with your machine's make, model, and most importantly, the serial number to confirm the SWE500 is the correct fit. An incorrect assembly will not install properly and can cause severe damage.

5. OEM vs. Aftermarket (SWE500)

• OEM (Original Parts):

  • Pros: Guaranteed fit and performance, highest quality standards, full warranty.

  • Cons: Significantly higher cost.

• Aftermarket (e.g., SWE500):

  • Pros: Major cost savings (often 30-50% less). Quality from reputable brands is very high and suitable for most applications.

  • Cons: Quality can vary. It is essential to choose a supplier known for using high-grade materials and precise manufacturing processes.

6. Symptoms of a Failing Track Tensioning Assembly

• Inability to Hold Tension: The track repeatedly becomes loose shortly after greasing.

• Grease Leakage: Visible grease around the belly drum or the release valve, indicating failed internal seals.

• The Idler is "Bottomed Out": The idler is pushed all the way forward even on a loose track, meaning the assembly has no travel left and is worn out.

• Physical Damage: Dents, cracks, or severe corrosion on the drum or yoke.