E70B Carrier Roller For Excavator Carrier Roller | Sealed Excavator Top Roller | Excavator Upper Roller

Product Overview

Our E70B Carrier Roller, also named excavator top roller or upper roller, is professional aftermarket undercarriage replacement part exclusively engineered for CAT E70B mini excavator models. Manufactured strictly following OEM dimension standards, this sealed upper carrier roller effectively supports upper track weight, prevents track sagging, stabilizes track operation and reduces abnormal track abrasion during daily construction, quarry and muddy field working. Adopting full sealed floating oil seal structure and high-strength alloy raw material, our CAT E70B top roller solves frequent oil leakage, becoming preferred spare part for excavator maintenance dealers, fleet owners and machinery repair factories worldwide. 

Key Features

• Premium Alloy Steel Raw Material: Roller body made of 50Mn/40Mn2 high manganese alloy steel; customized mining grade uses 40SiMnTi wear-resistant steel, solid for heavy-load mining, rocky working environment.
• Precise Medium Frequency Quenching Treatment: Outer roller surface overall heat treatment, hardness controlled HRC52~62, effective quenching depth ≥4mm to strengthen anti-abrasion and anti-impact performance, extend service cycle.
• 45# Solid Quenched Main Shaft: Integral tempering processing for central shaft, balance surface hardness and core toughness, resist bending deformation under long-time. continuous operation.
• Strict CNC Precision Machining: Every roller after forging blank adopts numerical control lathe finish machining, tolerance consistent with OEM original size, 100% direct bolt-on installation without modification.
• Two Option Versions Available: Standard engineering version for earthmoving, pavement construction; reinforced mining version for quarry, gravel crushing harsh working condition with longer warranty period.

Wide Application Working Scenarios

Our sealed E70B excavator upper carrier roller widely applies in multiple working fields including urban earthwork excavation, road construction, river dredging, gravel quarrying, farmland renovation and demolition engineering, adapting dry dusty, muddy, rocky and high-load various harsh construction environments.

Technical Specifications

Quality Assurance

Each carrier roller is manufactured under strict quality control procedures and inspected throughout the production process. Critical components undergo hardness testing, dimensional inspection, and sealing verification to ensure consistent quality and dependable field performance.

Our goal is to provide durable undercarriage parts that help maximize equipment uptime and reduce overall operating costs.

Maintenance Tips

To achieve maximum service life:

1. Maintain proper track tension.
2. Inspect undercarriage components regularly.
3. Remove accumulated debris after operation.
4. Replace worn parts before excessive wear affects adjacent components.
5. Follow recommended equipment maintenance schedules.

Regular inspection and maintenance contribute to improved machine performance and reduced downtime.

FAQ

Q1: Can this carrier roller be used in harsh environments?

Yes. The E70B carrier roller is engineered for demanding applications such as mining, quarrying, construction, road building, and earthmoving operations where equipment is exposed to heavy loads and abrasive conditions.

Q2: How can I identify when a carrier roller needs replacement?

Common signs include excessive roller wear, oil leakage, abnormal track movement, unusual noise, uneven track wear, or reduced machine stability. Regular inspections are recommended to maintain optimal undercarriage performance.

Q3: How do you ensure product quality?

Each carrier roller undergoes strict quality control procedures, including material inspection, machining verification, heat treatment control, seal testing, dimensional checks, and final performance inspection before shipment.

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