Hitachi excavator parts[(9114262; 4300532,9078675)EX100/1100/ZAX870-carrier roller ass'y]hitachi top roller/china roolers factory

Product Specifications

Hitachi excavator parts[(9114262; 4300532,9078675)EX100/1100/ZAX870-carrier roller ass'y]

Carrier rollers (also called upper rollers or track carrier rollers) are crucial components in the undercarriage system of track-driven machinery like excavators, bulldozers, and crawler loaders. They help support the weight of the machine and guide the track chain along the upper part of the undercarriage.

Functions of Carrier Rollers

1. Support the Track Chain – Keep the track aligned and prevent excessive sagging.

2. Reduce Friction – Allow smooth movement of the track over the undercarriage.

3. Distribute Load – Help balance the machine’s weight across the track system.

4. Absorb Shock – Cushion impacts when operating on rough terrain.

Types of Carrier Rollers

1. Single-Flange Carrier Rollers – Have one flange to guide the track, commonly used in smaller machines.

2. Double-Flange Carrier Rollers – Feature two flanges for better track alignment, often found in heavy-duty equipment.

3. Rubber-Coated Carrier Rollers – Reduce noise and vibration, ideal for urban construction or sensitive environments.

Signs of Worn-Out Carrier Rollers

• Excessive track sagging (loose track)

• Uneven wear on the track chain or rollers

• Grinding or squeaking noises

• Visible cracks, flat spots, or seized rollers

• Grease leakage (if sealed rollers fail)

Maintenance & Replacement Tips

✔ Regular Inspections – Check for wear, cracks, and smooth rotation.
✔ Proper Lubrication – Some rollers require periodic greasing (check manufacturer specs).
✔ Replace in Pairs/Sets – Ensures balanced performance and prevents uneven track wear.
✔ Clean Undercarriage – Remove mud, rocks, and debris to prolong roller life.

When to Replace Carrier Rollers?

• If wear exceeds 10% of the original diameter.

• If the roller no longer spins freely (seized bearing).

• If the flanges are cracked or heavily worn, risking track derailment.

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