23:02
Detailed Explanation of why I run my rubber tracks to the bitter end and 304 gets new shoes !!
Dirt Perfect
Overview
This video details the process and rationale behind replacing rubber tracks on a mini excavator. The owner explains his philosophy of running equipment until it's absolutely necessary to replace parts, using a cost-benefit analysis to justify continuing to use worn-out tracks. The video then walks through the step-by-step procedure of de-tensioning, removing, and installing new tracks, including a minor repair to an upper roller. It highlights practical tips, such as the importance of directional tracks and safety precautions when releasing hydraulic tension.
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Chapters
- Don't replace parts like rubber tracks just because they have minor cosmetic damage (cracks).
- The primary function of tracks is to stay on the machine and allow it to move.
- The owner has put 1200 hours on the current tracks, which were already worn when he purchased the machine.
- Running worn tracks can be financially beneficial if the machine is still profitable.
Understanding when to replace parts versus when to keep running them is crucial for maximizing profitability in equipment operation. This approach prioritizes function over appearance and relies on data to make informed decisions.
The owner's excavator tracks had cracks and missing pieces, but he continued to use them, adding 1200 hours of operation because they still functioned correctly.
- Calculate the profit per hour for the machine (e.g., $51/hour after all costs).
- Multiply profit per hour by the hours the worn tracks were used (1200 hours) to find total profit generated by those tracks ($61,200).
- Compare the total profit generated to the cost of new tracks (approx. $2500).
- The worn tracks paid for themselves many times over (24.5 times in this example).
This demonstrates a practical business application of calculating return on investment for equipment maintenance, showing how delaying non-critical part replacements can significantly boost overall profitability.
The worn tracks generated $61,200 in profit, while new tracks cost around $2,500, meaning the old tracks paid for the new ones 24.5 times over.
- Tracks fail when the crossbars, where the sprocket engages, break or detach.
- Once one crossbar fails, it puts extra stress on adjacent ones, leading to a chain reaction of failures.
- It's important to be prepared for potential breakdowns, especially when running equipment to its limits.
- Even with worn tracks, a breakdown is unlikely to cause significant downtime compared to the profit generated.
This explains the mechanical failure point of rubber tracks and reinforces the idea that while running them to the limit is often wise, understanding the signs of imminent failure is crucial to avoid unexpected and costly downtime.
The crossbars that the sprocket runs in started to pop out, indicating that the track was nearing complete failure and would soon need replacement.
- First, remove the cover to access the track tensioning mechanism.
- Locate and loosen the grease zerk on the tensioning cylinder to release hydraulic pressure.
- Use the excavator's bucket to push against the roller, further releasing tension and making the track slack.
- Once slack, use a pry bar and the machine's movement to carefully slide the track off the rollers.
Properly de-tensioning and removing tracks is essential for safety and to prevent damage to the undercarriage components during the replacement process.
Grease is released from a zerk, and then the excavator's bucket is used to push the roller back, creating slack in the track so it can be pried off.
- While the track is off, inspect all rollers and the sprocket for wear and damage.
- The owner found a damaged upper roller and decided to replace it immediately.
- Rollers are relatively easy to replace by unbolting them after the track is removed.
- For this type of excavator use (traveling, not pushing heavily), sprockets show minimal wear and don't need immediate replacement.
This step highlights the opportunity to perform essential maintenance and address minor issues while the machine is already down for a major component replacement, preventing future problems.
A damaged upper roller was identified and replaced during the track change process.
- Ensure the new tracks are oriented correctly, as some tracks are directional (mud holes should face forward).
- Use a pry bar and machine movement to guide the new track onto the rollers, starting with the rear.
- After the track is on, re-tension it by pumping grease back into the tensioning cylinder.
- Aim for a specific amount of slack (about 1.5 inches) for optimal performance and longevity.
Correct installation and proper tensioning of new tracks are critical for the machine's performance, efficiency, and the lifespan of the tracks and undercarriage components.
The new directional tracks were carefully maneuvered onto the rollers, and grease was pumped back into the tensioner to achieve the correct track tension.
- The owner opts for aftermarket tracks (IRT brand) for mini excavators, finding them acceptable for this application.
- The 'mud hole' design on these tracks helps clear debris from the sprocket.
- A safety warning is issued regarding releasing track tension: high pressure can cause grease injection injuries.
- Always be cautious when releasing tension on unfamiliar equipment.
This section provides practical advice on selecting parts and emphasizes crucial safety precautions that operators must take when working with hydraulic tensioning systems.
A warning is given about the potential for grease injection injuries when releasing track tension, based on a past accident where grease was injected into someone's thumb.
Key takeaways
- Maximize the lifespan of equipment parts by running them until failure is imminent, not just cosmetic.
- A cost-benefit analysis, factoring in machine profitability, justifies running worn parts.
- Understanding the mechanical failure points of components like rubber tracks helps predict when replacement is truly necessary.
- Proper de-tensioning and installation procedures are vital for safety and equipment longevity.
- Minor repairs and inspections should be performed during major component replacements to prevent future issues.
- Aftermarket parts can be a cost-effective option for certain equipment, but their suitability should be evaluated.
- Always prioritize safety, especially when dealing with pressurized systems like hydraulic track tensioners.
Key terms
Rubber tracksMini excavatorUndercarriageTrack tensioningGrease zerkHydraulic cylinderSprocketRollerAftermarket partsProfitability analysis
Test your understanding
- What is the primary criterion the owner uses to decide when to replace rubber tracks, beyond cosmetic damage?
- How does the owner calculate the financial benefit of running worn-out tracks?
- What mechanical failure point signals that rubber tracks are nearing the end of their usable life?
- What are the key steps involved in de-tensioning and removing a rubber track?
- What safety precaution should be taken when releasing the tension on a rubber track's hydraulic cylinder?