Mini Excavator Bottom Roller 7136983 for Bobcat E16 E17 E19 E20

Introduction to Mini Excavator Bottom Rollers

A bottom roller, also commonly referred to as a track roller or lower roller, is an essential component in the undercarriage system of tracked heavy machinery, such as excavators, bulldozers, and loaders. It is a cylindrical wheel-like part typically made from high-strength forged steel, equipped with sealed bearings and flanges to guide and support the track chain. Track rollers come in various sizes and configurations depending on the machine model, and they are designed to withstand extreme loads, abrasion, and environmental conditions like mud, rocks, and uneven terrain.

Function of Mini Excavator Bottom Rollers

• Supports Machine Weight: Bottom rollers bear the majority of the excavator's weight (up to 80-90%), distributing it evenly to prevent sinking and ensure stability on various terrains.
• Guides Track Chain: They guide the continuous track chain during rotation, maintaining proper alignment and smooth movement.
• Absorbs Impacts and Reduces Friction: By cushioning shocks from rough surfaces, they minimize friction, vibration, and wear on the tracks.
• Enhances Traction and Efficiency: They improve overall traction, reduce fuel consumption, and prevent premature damage to other undercarriage components like idlers, sprockets, and links.
• Promotes Longevity: Regular functioning extends the service life of the entire undercarriage system, reducing downtime and maintenance costs.

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 E16 (all serial numbers),  Bobcat E17, Bobcat E19, Bobcat E20 

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 Owners & Operators

• Longer track life – Properly supported tracks last 30–50 % longer.
• Reduced downtime – Bolt-on design, no pressing required, install in under 30 minutes per side.
• Smoother operation – Less vibration, better control on side slopes and uneven ground.
• Lower operating costs – Better weight distribution = less fuel burn and less strain on drive motors.

Frequently Asked Questions

Q: Is this a top roller or bottom roller?

A: Part 7136983 is used as the bottom/ lower roller on E16-E20 machines. On some older 300-series it can be used as either top or bottom depending on serial number.

Q: How many rollers per side?

A: E16/E17/ E19/ E20 usually have 4 bottom rollers per side (8 total per machine).

Q: What is your warranty?

A: 12 months or 1500 operating hours against defects in material and workmanship- one of the longest in the aftermarket industry.