Komatsu Carrier Rollers

Heavy-Duty Komatsu Carrier Rollers & Top Rollers

Prevent track chain sagging and maintain perfect structural alignment on your Komatsu crawler equipment with premium replacement carrier rollers from ShengAn. Engineered specifically to support the massive weight of the upper track link assembly, our Komatsu-compatible top rollers (upper rollers) eliminate track chain whipping, reduce travel resistance, and protect hydraulic travel motors from excessive shock loads.

Precision-forged from high-grade alloy steel and fitted with lifetime dual-cone mirror seals, our top rollers are built to perform under extreme mining, quarrying, and demolition environments. Browse our full stock of Komatsu top rollers below or contact our undercarriage experts today for direct factory pricing and a fast wholesale quote!

Metallurgical Integrity Tailored for Komatsu’s Extreme Workloads

Unlike standard crawler applications, Komatsu's heavy-duty undercarriages—especially those fitted on bulldozers or large mining excavators—subject the wholesale carrier roller to severe shock impacts and high abrasive wear during high-torque reverse travel. A locked or leaking top roller will cause rapid flat spots on the roller tread, creating a chain reaction of accelerated pin wear and structural vibrations.

ShengAn Excavator Parts solves these challenges by utilizing premium raw materials and specialized heat-treatment processes:

1. High-Density 50Mn/40Mn2 Forgings: Our raw castings are forged to eliminate microscopic air pockets and internal stress, creating a rock-solid foundation that resists flange cracking under sudden side-loading forces.

2. Deep-Casing Induction Quenching: We apply precise high-frequency heat treatment to achieve a thick hardened outer shell (HRC 52 ~ 58 down to 12 mm depth). This allows the roller to guide the heavy track chain smoothly while retaining a ductile internal core to absorb severe impacts.

3. Heavy-Duty Lubricant Fluid Barriers: Outfitted with premium-grade dual-cone floating seals and elastic nitrile O-rings. This hermetic seal locks in high-viscosity gear oil for life, protecting internal components from ultra-fine sand, slurry, and corrosive moisture.

4. Friction-Free Bimetal Bushings: Precision-machined internal shafts are paired with heavy-duty lead-bronze bushings to dissipate heat rapidly during long-distance continuous travel, preventing high-speed roller seizure.

Technical Properties: Komatsu Carrier Rollers

Komatsu Excavator & Dozer Model Support (Dash-6 to Dash-11)

Our extensive warehouse maintains immediate stock of top-rollers matching the mounting footprints, collar spacing, and shaft lengths of classic and modern Komatsu machines:

• Komatsu Compact & Utility Class: PC30MR, PC35MR, PC45, PC50MR, PC55MR, PC60-7, PC78US, PC88MR

• Komatsu Mid-Size Excavators: PC120-6, PC130-7, PC160LC, PC200-6, PC200-7, PC200-8, PC210-8/10, PC220-8, PC240LC, PC270, PC290

• Komatsu Production & Mining Excavators: PC300-7, PC300-8, PC350-8, PC360-10, PC400-7, PC400-8, PC450-8, PC600, PC800, PC1250

• Komatsu Crawler Bulldozer Series: D31P, D37EX, D50A, D60P, D65EX-12, D65PX-15, D85ESS-2, D155A-2, D155AX-5/6, D275A, D375A

Our carrier rollers are manufactured to OEM specifications and are compatible with numerous Komatsu PC Series excavators and Komatsu D Series bulldozers. Simply provide your machine model, serial number, or custom bulldozer parts number, and our technical team will recommend the correct replacement carrier roller.

Komatsu Carrier Rollers FAQ

Q: What is the main structural difference between Komatsu excavator and dozer top rollers?

A: While they share similar internal seal designs, Komatsu dozer (D-series) carrier rollers are built with wider profiles and heavier, reinforced double-flange structures. This design is crucial for handling the massive lateral forces and wider track shoes used in heavy land-clearing and grading operations.

Q: How do I verify fitment for older Komatsu Dash-5 or Dash-6 models?

A: Simply send us your machine model designation (e.g., PC200-6) along with the stamped chassis serial number or the OEM casting part number. Our parts specialists will instantly cross-reference our engineering drawings to ensure the mounting bolt-hole spacing matches your frame exactly.

Q: Are these carrier rollers shipped fully assembled and pre-lubricated?

A: Yes. Every single Komatsu-compatible top roller is delivered completely assembled, filled with long-life gear oil, and pressure-tested for zero leaks at our factory. They are ready for immediate bolt-on installation with no field maintenance required.