Mini Excavator Bottom Roller 7013575 for Bobcat E35 E32 E42

Summary of the mini excavator bottom roller introduction

The bottom roller (also called lower track roller or track roller) is a heavy-duty cylindrical wheel installed along the bottom of the excavator's track frame. It is usually made of forged high-strength steel with hardened surfaces and sealed bearings.

It carries most of the machine's weight (typically 70–90%), distributes the load evenly to the ground to prevent sinking, guides the track chain smoothly, reduces friction, absorbs shocks from rough terrain, and helps maintain stability and traction.

Other Main Undercarriage Parts & Their Relationships

• Carrier Roller (Top Roller): Supports the upper part of the track chain to prevent sagging; works together with bottom rollers to keep proper track tension and alignment.
• Idler (Front Idler): Located at the front, guides the track and adjusts tension; cooperates with bottom rollers to prevent track derailment.
• Sprocket (Drive Sprocket): At the rear, drives the track chain forward using engine/hydraulic power; relies on well-supported bottom rollers for efficient power transfer and reduced wear.
• Track Chain (with shoes/pads): The continuous loop that contacts the ground; bottom rollers roll directly underneath it, while carrier rollers support it from above, idlers guide the front, and sprockets drive it.

Standard manufacturing practices for track rollers (bottom rollers in excavators):

• Raw Materials → Forging → Machining → Heat Treatment → Grinding/Surface Treatment → Assembly → Quality Control → Packaging

Production Description:

Compitable Models: Bobcat E32, E32i, E35, E35i, E35Z, E42 (primary fit), plus E25, E26, E34, E37, E50, and older models like 225, 325, 328, 329, 331, 334, 335, 425, 428, 430 (verify serial number for compatibility to ensure perfect match)

MOQ: 2 PCS

Payment Method: T/T

Condition: New

Color: Yellow, Black or Customized

Lead Time: 15- 30 days

Warranty: 1 Year

Place of Origin: Quanzhou, China

Packing: Standard Export Wooden Pallet

Key Benefits for Bobcat Owners and Operators

• Enhanced Durability: Resists cracking and deformation in rocky or muddy sites, extending undercarriage life by 40-60%.
• Cost Savings: Reduces maintenance intervals and fuel consumption by maintaining optimal track tension and alignment.
• Easy Installation: Bolt-on design fits seamlessly—no special tools needed, typically 20-40 minutes per roller.
• Improved Performance: Minimizes vibration for better operator comfort and precision digging on slopes or tight spaces.
• Compatibility Assurance: Verified for Bobcat E35, E32, E42 series; cross-compatible with select older models to maximize fleet versatility.

KASU Factory Advantages:

• Direct Source Manufacturer with Years of Specialized Experience
• We are a dedicated factory with over20 years focused exclusively on mini excavator undercarriage parts — no trading company middlemen, ensuring consistent quality control from raw material to finished product.
• Strict Raw Material Selection & Traceability
• We only use high-grade forged alloy steels (50Mn, 40Mn2, 40Cr, etc.) from certified mills, with full chemical composition analysis and mechanical property testing for every batch — guaranteeing superior strength, toughness, and wear resistance.
• Precision Manufacturing & Advanced Processing
• State-of-the-art forging presses, CNC machining centers, medium-frequency induction quenching, and automated grinding lines deliver tight tolerances, uniform hardness (HRC 52–58 on tread), and excellent surface finish — every detail optimized for durability in harsh working conditions.
• Rigorous Multi-Stage Quality Inspection
• 100% inspection at key stages: ultrasonic/magnetic particle flaw detection after forging, dimensional & hardness checks after heat treatment, seal leakage & dynamic balance testing after assembly — we maintain defect rates far below industry averages.
• Comprehensive One-Stop Undercarriage Parts Supply
• Full range available: bottom rollers, top rollers (carrier rollers), front idlers, track chains, track shoes/pads, sprockets, and more — all compatible with popular mini excavator brands (Bobcat, Kubota, Yanmar, Takeuchi, John Deere, etc.), allowing customers to source everything from one reliable supplier.
• Competitive Factory-Direct Pricing
• By eliminating distributors and trading layers, we offer premium aftermarket quality at 30–50% lower prices than OEM parts and significantly better value than low-end imports.
• Fast Lead Time & Reliable Global Delivery
• In-house production capacity + efficient logistics enable short lead times (often 15–30 days for standard orders) and secure worldwide shipping with proper anti-rust & export packaging.

• Strong OEM/ODM Capability & Customization Support We welcome custom drawings, special heat treatment requirements, custom markings, and private labeling — ideal for distributors, dealers, and large fleet operators looking for branded or tailored solutions.

Frequently Asked Questions

Q: Does this fit my 2015 Bobcat E35 with rubber tracks?

A: Yes, it's a direct OEM replacement for E35 series post-2010. Verify serial if your model is older.

Q: How do I know if my bottom rollers need replacement?

A: Look for flat spots, excessive play, leaks, or noise during operation. Measure flange wear—if under 10mm depth, replace immediately.

Q: What's the difference between bottom and top rollers?

A: Bottom rollers support weight on the ground; top (carrier) rollers guide the upper track. This is a bottom roller (lower track roller).

Q: Can I get bulk discounts for my fleet?

A: Absolutely—email us with quantity for custom quotes on mini excavator bottom rollers.