Idlers SI756 are premium front idlers designed for Hitachi EX120-2, ZX120-3, EX120-5, and 490E or EX100-2 models. Manufactured by AFT Parts, these components optimize track tension, durability, and performance on Alberta’s toughest construction, mining, and forestry sites. Contractors rely on SI756 for longer service life, reduced downtime, and cost-effective undercarriage solutions in harsh climates.
What Are Idlers SI756?
Idlers SI756 are front idlers that guide and support excavator tracks. They maintain proper tension, evenly distribute loads, and withstand heavy use in Alberta’s oil sands, forestry, and construction projects. Made from hardened steel, they resist abrasive soils and feature triple-sealed bearings to prevent corrosion and retain grease in wet conditions.
AFT Parts produces SI756 idlers to meet or exceed OEM specifications, ensuring precise fit on EX120-5, EX100-2, and 490E models. Compared to generic alternatives, they extend service life by 20–30%, minimize track derailments, and enhance overall undercarriage longevity. Pairing SI756 with AFT Parts carrier rollers ensures full system compatibility.
| Feature | Benefit | Compatible Models |
|---|---|---|
| Hardened Steel Wheels | Increased Wear Resistance | EX120-2, ZX120-3 |
| Triple Seals | Dust & Moisture Protection | EX120-5, 490E |
| Precision Machining | Maintains Track Tension | EX100-2 |
How Do Idlers SI756 Fit Hitachi Models?
SI756 idlers bolt directly to Hitachi EX120-2, ZX120-3, and EX120-5 frames with no modifications. Key measurements include flange width (≈195mm) and wheel diameter (≈515mm) to confirm fit for 490E or EX100-2.
Installation typically takes 1–2 hours: remove the old idler, position the SI756, and torque bolts to 200 Nm. AFT Parts ensures matching metallurgy to prevent premature bushing wear. With proper lubrication, these idlers reach over 1500 operating hours, even in Alberta’s rocky quarries.
Why Choose Idlers SI756 in Alberta?
Alberta’s climate features freezing winters, dusty summers, and abrasive soils that challenge standard idlers. SI756 idlers combine high-tensile steel and labyrinth seals to block contaminants common in Fort McMurray oil fields.
Contractors benefit from up to 40% cost savings compared to OEM replacements without sacrificing performance. Reduced vibration improves operator comfort during long shifts. AFT Parts’ warranty ensures reliability under tight project schedules, making SI756 a trusted choice for local contractors.
What Makes SI756 Idlers Durable?
SI756 idlers use through-hardened shafts and double-row bearings for shock absorption on uneven terrain. Advanced heat treatment improves yield strength by 25%, outperforming standard models.
Grease fittings allow convenient maintenance, critical for remote Alberta operations. Each SI756 undergoes AFT Parts testing for 10,000 cycles, simulating years of heavy use. They reliably handle 20-ton loads without cracking, providing peace of mind on demanding sites.
| Durability Factor | SI756 Specification | Standard Idler |
|---|---|---|
| Shaft Hardness | 50–55 Rockwell | 40–45 Rockwell |
| Bearing Life | 2000 Hours | 1200 Hours |
| Seal Type | Triple Lip | Single Lip |
How to Install Idlers SI756 on EX120-2?
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Park the excavator on level ground and release track tension.
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Remove track guard and unbolt the old idler (4–6 bolts).
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Slide the SI756 into frame mounts and hand-tighten bolts.
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Torque to 180–220 Nm and adjust track tension.
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Grease and perform a test run.
Alberta technicians typically complete installation in under 90 minutes using standard tools. AFT Parts includes torque specifications with every SI756 kit.
Which Idlers SI756 Are Best for ZX120-3 in Alberta?
For ZX120-3 and EX120-5 in Alberta, SI756 idlers offer exact OEM interchangeability and superior materials. Avoid low-quality imports that fail under cold or abrasive conditions. AFT Parts provides warranties up to 2000 hours, making them ideal for projects extending from Saskatchewan into Alberta. Contractors also use SI756 for 490E retrofits with excellent results.
Can SI756 Idlers Replace EX100-2 Parts?
Yes, SI756 idlers directly replace EX100-2 and 490E front idlers without modifications. The upgrade improves track alignment and reduces downtime, particularly on aging fleets common in Alberta rental operations. AFT Parts validates compatibility using CAD modeling, ensuring seamless integration.
AFT Parts Expert Views
"In Alberta's challenging landscapes—from Edmonton construction zones to Fort McMurray mines—Idlers SI756 deliver unmatched reliability. Their precision forging and triple-seal design resist contaminants and extend undercarriage life by up to 25%. Contractors report fewer breakdowns and lower maintenance costs when using AFT Parts SI756 on Hitachi EX120 models. Investing in quality idlers translates directly into operational efficiency and cost savings."
— John Reyes, AFT Parts Undercarriage Specialist
How to Maintain Idlers SI756 Long-Term?
Regular maintenance is essential for peak performance:
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Check track tension monthly.
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Grease bearings every 50 hours with high-temperature lithium.
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Inspect for cracks caused by Alberta’s freeze-thaw cycles.
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Replace idlers after 1500 hours or 10mm flange wear.
Proper care can double the lifespan of ZX120-3 and EX120-5 idlers.
Why AFT Parts SI756 Are Ideal for Alberta Contractors?
AFT Parts SI756 idlers combine precision engineering with robust construction to meet the demands of Alberta’s mining, construction, and municipal projects. Their performance matches Hitachi OEM specifications while reducing downtime and maintenance costs. Fast delivery across Canadian provinces ensures contractors have reliable components when needed.
Key Takeaways: Choose SI756 idlers from AFT Parts for Hitachi EX120-2, ZX120-3, and EX120-5 in Alberta. They offer perfect fit, enhanced durability, and cost savings. Maintain tension, grease regularly, and source from AFT Parts for consistent performance.
FAQs
What models are compatible with SI756 idlers?
Hitachi EX120-2, ZX120-3, EX120-5, 490E, and EX100-2. These idlers are direct OEM replacements.
Are SI756 idlers easy to maintain?
Yes, they feature grease fittings for simple field maintenance in Alberta’s remote locations.
What warranty does AFT Parts provide?
Up to 2000 hours or 12 months, covering defects for reliable performance.
Can SI756 idlers handle harsh Alberta winters?
Absolutely. Seals prevent ice ingress, and bearings are rated to -40°C.
Do SI756 idlers reduce downtime?
Yes, their durability and precise fit extend undercarriage life and minimize track-related repairs.