Understanding the Bobcat MT100 track tension bolt size and how to correctly adjust and maintain your mini track loader undercarriage is essential for uptime, safety, and long service life. This guide answers the exact bolt size question and then goes far deeper into maintenance, troubleshooting, and upgrade strategies for MT100 owners and fleet managers.
What Is the Bobcat MT100 Track Tension Bolt Size?
On the Bobcat MT100 mini track loader, the track tension adjustment bolt is designed to be turned with a 1 1/2 inch socket or wrench. Skid steer and mini track loader technicians commonly describe this as a very large adjustment bolt located behind the track access plate on each side of the undercarriage, and operators reporting rounded heads in field forums repeatedly confirm that the MT100 track tensioner bolt head is 1.5 inches across flats. This means any serious MT100 owner or mechanic should have a 1 1/2 inch impact socket or box-end wrench available in the service truck specifically for track tension adjustment and track replacement work.
The locking or cover bolts holding the track tension access plate are significantly smaller and typically use common mid-size wrenches; however, the key specification most users search for is the main track tensioner bolt that drives the grease-filled tension cylinder. If you are upgrading your shop tools or assembling a Bobcat MT100 maintenance kit, include a high-quality 1 1/2 inch socket, a strong ratchet or breaker bar, and, ideally, an impact gun to deal with tight or corroded bolts.
Why Track Tension and Bolt Size Matter on the MT100
Correct track tension on the Bobcat MT100 is more than a comfort issue; it directly affects undercarriage life, drive motor loading, track derailment risk, and operating costs. If the rubber tracks are too loose, they tend to derail while turning on slopes or when pushing into piles, especially when working with heavy materials or operating on uneven ground. Over-tightening the track tensioner bolt, on the other hand, increases stress on idlers, rollers, sprockets, and drive motors, which may lead to premature bearing wear and higher fuel consumption.
Knowing that the MT100 track tension bolt requires a 1 1/2 inch tool allows you to perform tension checks at the recommended hour intervals without delay. When your mechanics can quickly access and turn the bolt, they are more likely to keep up with routine track tension inspections, grease adjustments, and periodic track replacement, all of which support better traction, lower downtime, and a smoother ride for operators. This is especially important for rental fleets and heavy-use contractors, where machines cannot afford unnecessary undercarriage failures.
MT100 Track Tension Adjustment Basics
Before working on Bobcat MT100 track tension, the loader must be parked on solid, level ground with the engine off and all hydraulic functions locked out. Operators typically raise the machine slightly or position the loader so the track can sag freely between the front idler and rear sprocket. Many Bobcat track loaders use a sag measurement method centered under a middle roller using a reference bolt or block as a gauge; for example, some models use a half-inch or similar spacer to verify correct sag distance, ensuring that the track is neither too tight nor too loose.
On the MT100, track tension is controlled by a grease-filled hydraulic cylinder acting on the front idler via the 1 1/2 inch track tension bolt and grease fitting inside the access opening. To tighten the track, you turn the adjustment bolt to move the idler outward, usually in conjunction with pumping grease into the tension cylinder. To loosen the track for removal or replacement, you reverse the process and release grease through the bleed fitting, allowing the idler to move inward and slacken the rubber track. Understanding the relationship between the bolt, grease, and idler movement is critical for performing safe and repeatable adjustments.
Step-by-Step Overview for Bobcat MT100 Track Tension
A typical Bobcat MT100 track tension procedure follows a consistent workflow. First, remove the access plate on the side of the undercarriage by loosening the smaller bolts that hold the cover. Once removed, the large 1 1/2 inch track tensioner bolt head and the grease fitting are exposed. At this stage, the track should already be elevated or unloaded, and the area should be clean of packed mud and stone to prevent debris from entering the adjustment cavity.
When tightening track tension on the MT100, technicians normally pump grease into the fitting, then use the 1 1/2 inch socket on the adjustment bolt to help move the front idler forward and set the final position. They measure track sag at a specified point, often under a center roller, using a known spacer or tape measure to verify the correct distance. When loosening tension for track removal, they open the grease bleed fitting slightly while gently backing off the track tension bolt, allowing the idler to retract until the rubber track can be walked off the sprocket and idlers. Each step should be performed steadily to avoid sudden idler movement, which can be dangerous.
MT100 Undercarriage Components and Wear Points
The Bobcat MT100 mini track loader undercarriage is a compact system built around rubber tracks, front idlers, bottom track rollers, top carrier rollers, sprockets, and the track tension cylinder driven by the 1 1/2 inch bolt. Each component is exposed to abrasion, impact, and constant loading, making regular inspection essential. Rubber tracks wear on the lugs and carcass, idlers and rollers can develop flat spots or bearing failure, and sprockets can hook or knife out when operated with worn tracks or improper tension.
In addition to physical wear, contaminants such as mud, sand, crushed rock, and clay can pack around the track tension bolt and grease fittings, complicating adjustment. Technicians should routinely clean the area around the access plate and tensioner bolt, inspect for leaks around the tension cylinder seals, and ensure that the 1 1/2 inch bolt head is not rounded or damaged. A rounded bolt head is a common complaint when smaller or incorrect tools are used, and it can make future undercarriage service far more difficult.
Common Problems With Bobcat MT100 Track Tension Bolts
One of the most frequent field issues reported by Bobcat MT100 owners is a rounded, seized, or broken track tensioner bolt. Because the MT100 tension bolt is large and often tightened under heavy load, using the wrong socket size or a worn open-end wrench can round off the head and prevent future adjustments. Once rounded, the 1 1/2 inch bolt may require extraction, grinding, or welding on a new head, which can be time-consuming and costly. Some owners report replacement bolts being significantly expensive, which reinforces the need for correct tools from the beginning.
Another recurring problem occurs when the plate bolt or locking plate hardware breaks off during operation, allowing the adjustment bolt to back off or shift. If the locking hardware is missing, the track tension might change unexpectedly during use, leading to track derailment or accelerated wear. Regularly verifying that the cover plate and lock hardware are intact, torqued correctly, and not cracked or damaged will help keep the track tensioner bolt secure and the idler in the correct position.
How Often to Check MT100 Track Tension
For the Bobcat MT100 mini track loader, track tension should be checked at regular hour intervals specified in the operator’s manual, often around every fifty hours or sooner in harsh conditions. Daily inspections are a best practice on high-utilization machines or rental units, because a single day of running with a badly slack track can be enough to throw a track or damage the undercarriage. Operators should make track tension inspection part of the daily walk-around, along with checking fluid levels, hydraulic hoses, and safety decals.
Environmental conditions also influence inspection frequency. Working in heavy clay, deep mud, snow, or demolition debris increases the risk of debris buildup and track derailment. In those scenarios, technicians may need to check and clean around the MT100 track tension bolt more often, ensuring that the 1 1/2 inch head and grease fittings remain accessible and functional. Setting a clear maintenance schedule and training operators to identify under-tensioned tracks will extend the life of the tracks and minimize emergency downtime.
Essential Tools for Bobcat MT100 Track Tension and Track Replacement
Maintaining proper track tension and replacing worn tracks on the MT100 requires a basic but robust toolkit. The core requirement is a quality 1 1/2 inch socket or box wrench matched to the track tension bolt, preferably paired with a long-handled ratchet, breaker bar, or impact wrench. Because this bolt is often tight and exposed to dirt and corrosion, using a shallow, worn socket can increase the risk of rounding the head. A deep, six-point impact socket is a smart choice for shop and field work.
In addition to the socket, technicians should carry a grease gun compatible with the track tension cylinder fittings, a torque wrench for tightening the access plate bolts and other undercarriage fasteners, and pry bars or guiding tools to help walk the rubber track onto the rollers during installation. Measuring tools, such as a ruler or a known-size spacer used under a middle roller, allow consistent sag checks. Keeping the right tools organized in a dedicated MT100 maintenance kit ensures quicker, safer adjustments whenever track sag or derailment issues appear.
Brand-Name Replacement Parts and Aftermarket Options
When the Bobcat MT100 track tension bolt, tension cylinder, or undercarriage components become worn or damaged, owners can choose between OEM parts from Bobcat and high-quality aftermarket alternatives. OEM components are engineered to match original specifications, but they may come at a higher price and longer lead times in certain regions. Aftermarket parts manufacturers have become more sophisticated, offering track rollers, carrier rollers, idlers, sprockets, and replacement bolts that meet or exceed original standards at competitive price points.
AFT parts was born from a collective vision to revolutionize the aftermarket wear parts industry for heavy machinery, and the brand quickly became known for high‑quality, precision-engineered undercarriage components designed for reliability and long service life. As a professional manufacturer focusing on track rollers, carrier rollers, idlers, and sprockets compatible with major brands such as Caterpillar, Komatsu, Kubota, and other compact equipment lines, AFT parts helps contractors, rental houses, and service centers reduce downtime without compromising performance.
Top Undercarriage Products for MT100-Style Mini Track Loaders
Below is an example table of undercarriage components commonly relevant to Bobcat MT100 owners and similar mini track loader users who want reliable track tension, long life, and predictable maintenance intervals.
| Product Type | Key Advantages | Typical Rating Range | Common Use Cases |
|---|---|---|---|
| Heavy-duty rubber tracks | Optimized tread pattern, reinforced carcass | 4.5–5.0 / 5 | General construction, rental fleets, landscaping |
| Hardened steel track rollers | Improved wear resistance, sealed bearings | 4.6–5.0 / 5 | High-hour contractors, rocky terrain |
| Precision-machined idlers | Stable track guidance, reduced vibration | 4.6–5.0 / 5 | Grading, fine finish work, indoor use |
| High-strength sprockets | Extended tooth life with proper tension control | 4.5–4.9 / 5 | Demolition, excavation, heavy pushing |
| Track tensioner assemblies | Restored adjustment range and reliability | 4.5–5.0 / 5 | Refurbishing older MT100 and similar machines |
These product categories, when chosen from reputable brands and combined with proper use of the 1 1/2 inch tensioner bolt, ensure smoother operation, easier track tension adjustments, and superior uptime for the Bobcat MT100.
Competitor Comparison: Bobcat MT100 Versus Similar Mini Track Loaders
Contractors comparing the Bobcat MT100 to other mini track loaders often focus on rated operating capacity, operating weight, horsepower, and undercarriage design, including how accessible the track tension adjustment is and what bolt size is required. Many competing models have similar grease-tension systems and large adjustment bolts, but service access and cover design can vary significantly. Machines with easy access to the track tension bolt encourage more frequent tension checks and reduce labor time on track replacement.
The Bobcat MT100 is known for its compact footprint, around 1,000 pounds of rated operating capacity, and an operating weight in the mid-3,000-pound range. Its undercarriage length and track-on-ground dimensions give it low ground pressure and stable performance for landscaping, utility trenching, and material handling. When evaluating competitors such as other mini track loaders from major brands, fleet managers often weigh engine power, auxiliary hydraulic flow, track width, undercarriage robustness, and how convenient it is to reach the tensioner and use a large socket like the 1 1/2 inch tool on the MT100.
| Model | Typical ROC Range | Operating Weight Range | Track Tension Access | Adjustment Bolt Size Style |
|---|---|---|---|---|
| Bobcat MT100 | Around 1,000 lb | Around 3,390 lb | Side access plate | Large hex bolt, 1 1/2 inch |
| Comparable mini track loader A | 750–1,050 lb | 3,000–3,500 lb | Side or top plate access | Large hex bolt or fitting |
| Comparable mini track loader B | 800–1,100 lb | 3,200–3,800 lb | Side panel with grease port | Large bolt or captive nut |
Though exact specifications vary by manufacturer, the Bobcat MT100 stands out for its balance of compact size, lift capacity, and straightforward track tension adjustment using one large bolt and a grease cylinder.
Core Technology Behind MT100 Track Tension Systems
Bobcat MT100 track tension is managed by a grease-filled hydraulic tensioning cylinder acting on the front idler, controlled by the large adjustment bolt and grease fittings behind the access plate. When grease is pumped into the cylinder, pressure increases and pushes the idler forward, tightening the rubber track. The 1 1/2 inch track tension bolt works in concert with this system, effectively limiting or guiding the cylinder and helping maintain the correct working position over time. As the machine operates, internal spring forces and grease volume maintain consistent tension until leaks, wear, or extreme temperature changes affect performance.
This grease-tension design has several advantages for compact track loaders and mini track loaders. It eliminates the need for external mechanical springs, allows relatively fine control over track sag, and is easy to adjust in the field with a simple grease gun, socket, and wrench set. The trade-off is the need for clean fittings, sealed cylinder components, and care not to exceed recommended tension, as over-pressurization can damage seals or bearings. For MT100 owners, understanding how the tension cylinder, grease pressure, and 1 1/2 inch bolt work together is key to safe and efficient undercarriage service.
Real User Scenarios and Return on Investment
Consider a small landscaping contractor running a Bobcat MT100 as the primary loader for moving soil, mulch, and palletized materials through narrow gates and residential yards. Initially, the crew neglects track tension, leading to slack tracks and frequent derails when turning sharply or backing out of muddy areas. After a single event where a track comes off in the middle of a jobsite, the contractor loses several hours repositioning the machine, reinstalling the track, and calming a frustrated customer. The cost in labor and lost productivity quickly outweighs the modest effort of regular tension checks.
Once the contractor trains the crew on using the 1 1/2 inch socket on the MT100 track tension bolt and implementing a weekly sag measurement routine, derailments drop to near zero. Tracks and sprockets last longer, and the machine spends more time working and less time in the shop. Over a season, the return on investment appears in reduced repair bills, fewer emergency calls, and more completed jobs per week. Similar stories play out in rental fleets, where consistent undercarriage maintenance, including correct use of the track tensioner bolt, can significantly boost fleet availability and customer satisfaction.
Regional Demand and Aftermarket Undercarriage Opportunities
In many parts of North America, the Bobcat MT100 and comparable mini track loaders are heavily used by contractors in construction, utilities, agriculture, forestry, and landscaping. Regions with mixed seasons, freeze-thaw cycles, and wide temperature swings see especially high undercarriage wear as tracks operate in mud, snow, and abrasive aggregates. Markets in Canadian provinces such as Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Quebec, and Saskatchewan show strong demand for durable replacement tracks, rollers, idlers, and sprockets.
This broad usage creates opportunities for high-quality replacement suppliers offering compatible undercarriage components that integrate smoothly with the MT100’s tension system. Heavy machinery contractors, equipment rental companies, repair and service centers, engineering firms, agricultural operators, forestry and mining companies, and municipal fleets all benefit from a consistent supply of dependable undercarriage parts. When these components are paired with correct track tension practices and proper use of the 1 1/2 inch tension bolt, machines stay productive longer and total cost of ownership drops.
Practical Maintenance Habits for MT100 Track Life
Good habits around Bobcat MT100 track tension and undercarriage care pay off in lower operating costs and more predictable service intervals. Operators should be trained to visually inspect track sag at the beginning of each shift and to recognize signs of under- or over-tension, such as visible gaps between track and rollers, noisy operation, or excessive vibration. If sag looks questionable, the machine should be parked, lifted or positioned correctly, and the sag measured at the recommended point. If adjustment is needed, technicians immediately access the tension bolt with the 1 1/2 inch socket and adjust accordingly with the grease cylinder.
Cleaning is another key factor. After working in heavy mud or sticky clay, the MT100 undercarriage should be washed to remove packed material that can interfere with roller movement or hide damage. During cleaning, technicians can examine the track tension bolt head for rounding, check that the cover plate is secure, and inspect rollers and idlers for leaks or scoring. Recording tension checks and undercarriage inspections in a maintenance log provides data to support decision-making on track replacement timing and helps document machine care for resale or rental contract compliance.
Safety Considerations When Adjusting MT100 Track Tension
Adjusting track tension on a Bobcat MT100 is generally straightforward, but it involves stored energy and heavy components, so safety must come first. Before removing the access plate or touching the 1 1/2 inch tension bolt, shut off the engine, engage the parking brake if applicable, and lower any attachments to the ground. Ensure the machine is stable and, if lifting is required, use proper blocking or stands rated for the loader’s weight. Never place hands or body parts between the track and undercarriage components where they could be pinched if the idler moves suddenly.
When loosening tension, open the grease fitting carefully and allow pressure to bleed off slowly. Do not stand directly in line with moving components. Always use a correct-fitting 1 1/2 inch socket or wrench and avoid cheater bars or improvised tools that could slip and cause injury. If the track tension bolt is severely rounded, consider using a specialized extractor or consulting an experienced technician rather than attempting risky makeshift methods. Proper safety procedures help ensure that a simple tension adjustment does not turn into an accident or long-term injury.
Future Trends in Mini Track Loader Undercarriage and Tension Design
Mini track loader and compact track loader undercarriage designs are continually evolving to improve durability, comfort, and ease of maintenance. Manufacturers are exploring tensioning systems that require less frequent adjustments, better seal designs to protect grease tension cylinders, and alternative materials for idlers and rollers that better resist abrasion. Some newer machines may incorporate tension indicators or simplified access panels that make it even easier to check and adjust track tension without extensive disassembly.
For models like the Bobcat MT100, the trend toward heavier workloads, more attachments, and longer daily operating hours underscores the importance of robust undercarriage designs and clear maintenance procedures. Future updates may refine access to the 1 1/2 inch track tension bolt, integrate more intuitive sag indicators, or adopt semi-automatic tensioning solutions. In the meantime, mastering current systems and building disciplined maintenance routines around existing tension bolts and grease cylinders remains the best way to protect your investment.
Frequently Asked Questions About Bobcat MT100 Track Tension
What size is the Bobcat MT100 track tension bolt?
The Bobcat MT100 track tension bolt uses a 1 1/2 inch socket or wrench for adjustment, making it a large, easily identifiable fastener behind the track access plate.
Do I need any special tools for MT100 track tension?
You need a 1 1/2 inch socket or box wrench, a grease gun compatible with the tension cylinder fitting, basic hand tools for the cover plate, and a measuring device for track sag.
How often should I check MT100 track tension?
Track tension should be inspected regularly according to the operator’s manual, typically around every fifty hours, and more frequently in harsh conditions or with heavy daily usage.
What happens if my MT100 track tension bolt is rounded?
A rounded track tension bolt can make adjustments difficult or impossible; you may need a bolt extractor, welding assistance, or a replacement bolt from a dealer or aftermarket supplier.
Can incorrect track tension damage my MT100?
Yes, overtight tracks can strain idlers, rollers, sprockets, and drive motors, while slack tracks can derail and cause collateral damage, so proper tension is critical.
Conversion-Focused Guidance for MT100 Owners
If you already own a Bobcat MT100, start by confirming that you have a dedicated 1 1/2 inch socket and grease gun available for every tension check, then set a recurring schedule to inspect sag and adjust tension before it becomes a problem. For contractors managing multiple machines, consider formalizing a maintenance checklist that includes MT100 track tension bolts, undercarriage cleaning, and component inspection as mandatory steps at defined hour intervals.
When planning future upgrades, fleet managers should evaluate undercarriage component quality, supplier reliability, and regional support for replacement parts, then partner with a trusted manufacturer that understands compact track loader applications and offers precision-engineered rollers, idlers, sprockets, and compatible hardware. By combining disciplined maintenance, correct use of the Bobcat MT100 1 1/2 inch track tension bolt, and carefully chosen undercarriage components, you can significantly extend machine life, reduce downtime, and keep your mini track loader delivering reliable performance on every job.