This Track Roller Yellow Bottom Roller Compatible with:
Bottom Roller Track Roller For Komatsu D20 D21 D20A D21A D21P D20P Yellow

Application:
Fits Komatsu D20 D21 D20A D21A D21P D20P

Specifications：
Bottom Roller Weight：35.27 pounds
Package Dimensions：6.69"X6.69"X10.6"
Item Package Quantity：1x Bottom Roller
Color:Yellow
Material: 50 MnB Steel
Surface Hardness: HRC52-60, Deepth:5mm-10mm
Finish:Smooth
Technique: Forging and Casting

Track Roller Features:
1. Wheel body:
forged from 50Mn round steel with good hardenability. The heat treatment process of quenching and
tempering and medium frequency surface quenching ensures its strength and wear resistance.
two pieces roller shell rim. Heat treated shells for body strength and longer wear life.
Heat treated for a deep uniform hardened depth that provides wear life equal to link wear life.
2.Roller shaft:
shaft and bearing designed to carry and turn with heavy track weight forged and heat treated for strength.
Bearing surfaces are hardened and polished to reduce friction and wear
Center flange absorbs side thrust from roller shell.
3.Cast Iron bushing:
Supports the bronze sleeve bearing.
Cast from iron to absorb loads without permanent deformation.
Large lubricant reservoir to reduce heat build up
4.Bronzed sleeve bearing:
Sleeve design provides a large surface area for better load distribution.
Inner diameter surface is polished to a smooth finish.
Soft bronze coating in the bearing absorbs any small foreign particles before they can damage the shaft and seals.

Item specifics:
Compatible Equipment Make: Komatsu
Model: D20 D21 D20A D21A D21P D20P
Part Type: Bottom Roller
Compatible Equipment Type: Excavator

Description：
1. Shell
Material 50Mn, through hardened HRC 25-28, CASE hardened HRC52-56, hardened thickness 5-8mm.
2. Side cover : QT450-10.
Strength is as follows
Tensile strength σb (MPa): ≥450
Yield strength σ0.2 (MPa):≥310
Hardness:160 ~ 210 hb
3. Roller, 45# carbon steel or 40Cr, quenched HRC25-30, surface quenched HRC52-58, hardened to a depth of 2-3mm.
4. Locking pin, 65Mn or 45 carbon steel, hardened HRC25-28.
5. Bolt, grade 12.9, HRC45-52. 6.
6. Seal: Nitrile rubber. Operating temperature range -20℃ to 110℃.

Features:
1.This bottom roller is a durable undercarriage replacement part for your excavator.
2.Our rollers utilize special high strength-hardened steel and quality seal groups that provide excellent lubricating oil retention.
3.Sealed bearings stop dirt, mud, and grime from penetrating inner components.
4.It was designed and manufactured to exact OEM specifications using a high-quality, high-strength steel.
5.It will provide long-lasting and dependable performance even if you operate in the most extreme conditions.