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{"title":"Doosan DX225LC OEM Direct Replacement Top Roller with HRC50-58 Surface Hardness","imgUrl":"https:\/\/img.chinax.com\/nimg\/6e\/fb\/4093183492d74e85bfce2882dcfd-200x200-1\/doosan_dx225lc_oem_direct_replacement_top_roller_with_hrc50_58_surface_hardness_and_cnc_precision_machining.jpg","attrs":{"Brand Name":"ZTMC","Model Number":"DX225LC-3\/DX225LC-5","Certification":"ISO9001,ISO9001-9002","Place of Origin":"CHINA"}}
{"title":"Doosan DX200A DX200LC OEM Replacement Top Roller with 50Mn Wheel Body and CNC","imgUrl":"https:\/\/img.chinax.com\/nimg\/10\/1d\/4cd35a2e5d968553a66d65dc21b0-200x200-1\/doosan_dx200a_dx200lc_oem_replacement_top_roller_with_50mn_wheel_body_and_cnc_precision_processing.jpg","attrs":{"Brand Name":"ZTMC","Model Number":"DX200A\/DX200LC","Certification":"ISO9001","Place of Origin":"CHINA"}}
{"title":"Doosan OEM Replacement Top Roller with 40Mn Material and 1 Year Warranty for","imgUrl":"https:\/\/img.chinax.com\/nimg\/bb\/49\/37e6716ce3837486f21f6274d8b8-200x200-1\/doosan_oem_replacement_top_roller_with_40mn_material_and_1_year_warranty_for_dx220lc_9_dx225lc_9_excavators.jpg","attrs":{"Brand Name":"ZTMC","Model Number":"DX220LC-9 DX225LC-9 DX200A DX200LC DX225LCA DX260LCA","Certification":"ISO9001","Place of Origin":"CHINA"}}
{"title":"Komatsu PC200-5 PC200-6 OEM Replacement Top Roller with High-strength 50Mn Steel","imgUrl":"https:\/\/img.chinax.com\/nimg\/9a\/ba\/173a13cf8758e4227374fd904b0e-200x200-1\/komatsu_pc200_5_pc200_6_oem_replacement_top_roller_with_high_strength_50mn_steel_and_hrc52_58_hardness.jpg","attrs":{"Brand Name":"ZTMC","Model Number":"PC200-5\/PC200-6","Certification":"ISO9001","Place of Origin":"CHINA"}}
{"title":"CAT 120B Top Roller OEM Direct Replacement Heat Treated and Coated with CNC","imgUrl":"https:\/\/img.chinax.com\/nimg\/94\/4a\/c06ac189ccbbd63fe2fbff106522-200x200-1\/cat_120b_top_roller_oem_direct_replacement_heat_treated_and_coated_with_cnc_ultra_precision_machining_for_excavators.jpg","attrs":{"Brand Name":"ZTMC","Model Number":"CAT120B\/E120B","Certification":"ISO9001","Place of Origin":"CHINA"}}
{"title":"CAT311 OEM Direct Replacement Top Roller with Heat Treatment HRC 52-58 and CNC","imgUrl":"https:\/\/img.chinax.com\/nimg\/70\/ce\/5e8858073240c616404e5d2b0d36-200x200-1\/cat311_oem_direct_replacement_top_roller_with_heat_treatment_hrc_52_58_and_cnc_ultra_precision_machining_for_excavator_undercarria.jpg","attrs":{"Brand Name":"ZTMC","Model Number":"CAT 311 \/ 311B \/ 311C","Certification":"ISO9001","Place of Origin":"CHINA"}}
PC120-5 PC120-6 Top Roller, OEM Replacement Part 21W-30-00020, Carrier Roller for Excavator Undercarriage, Construction & Quarry Sites
This carrier top roller is a 1:1 OEM direct replacement for PC120-5 and PC120-6 excavators, with official part number 21W-30-00020. No cutting, drilling or secondary modification is required during installation. It adapts to long-term heavy-duty operation and resolves common undercarriage running issues of PC120-5 and PC120-6 equipment fleets.
Product Specification
Item
Specification
OEM Part Number
21W-30-00020
Applicable Model
PC120-5 / PC120-6
Machining Tolerance
±0.01mm CNC ultra-precision machining
Heat Treatment Process
Overall quenching + stress relief tempering
Working Scenarios
Muddy construction site, gravel quarry, road renovation, rough earthmoving terrain
Installation Type
Plug-and-play OEM direct replacement
Applicable Working Environments
These excavator models are widely used in municipal engineering, quarry operations and road maintenance. Long-term muddy water immersion, gravel friction and continuous impact load will cause ordinary rollers to develop track shaking, track sagging, seal leakage and shaft jamming. This component is built to suit complex working conditions and maintain stable operation.
Core Production Technology
One-piece integral forging steel blank is adopted to ensure structural stability. Dual heat treatment is applied: quenching improves surface hardness against abrasive wear; tempering eliminates internal stress to prevent shell cracking under repeated impact. All mounting holes and contact surfaces are CNC processed with machining error within 0.01mm, fully matching original factory dimensions.
On-site Installation Steps
Raise the excavator track with a hydraulic jack to separate it from the ground and release partial track tension.
Remove fixing bolts of the old roller, take out the damaged part and clean dust and sediment on the mounting base.
Place the new roller in position and align the bolt holes accurately.
Fasten all bolts with standard torque, reset track tension and test idle running.
Confirm no abnormal vibration or friction noise to complete installation.
Optimized On-site Operation Performance
Precise dimensions eliminate track deviation and walking vibration
Reinforced sealing structure prevents muddy water ingress and oil leakage
Complete heat treatment lowers the risk of roller shell fracture
Direct installation saves on-site maintenance time and labor cost
Real Customer Cooperation Case
A local construction service team operates multiple PC120-5 and PC120-6 excavators. Generic rollers used before failed within 690-840 working hours. After switching to our products, the rollers run stably for over 1800 working hours without faults, reducing annual undercarriage maintenance costs by 33%.
FAQ
Q1: Does this part fit both PC120-5 and PC120-6?
A: Yes. Part No. 21W-30-00020 matches both models perfectly, no extra adjustment needed during installation.
Q2: What is the difference between your products and generic rollers?
A: Most generic products omit tempering and have dimensional tolerance above 0.05mm. Our dual heat treatment and 0.01mm high-precision machining ensure reliable performance in harsh environments.
Q3: Can you provide inspection documents for bulk orders?
A: Yes. We supply heat treatment test reports and dimensional inspection reports for all bulk shipments.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Year Established:
2015
Total Annual:
5000000-8000000
Employee Number:
100~120
Ecer Certification：
Verified Supplier
Nanan Zhongte Construction Machinery Factory is located in Quanzhou, Fujian Province, China — a city recognized by UNESCO as the starting point of the ancient Maritime Silk Road and also a vibrant metropolis with an economic output exceeding one trillion yuan. As a large enterprise specializin... Nanan Zhongte Construction Machinery Factory is located in Quanzhou, Fujian Province, China — a city recognized by UNESCO as the starting point of the ancient Maritime Silk Road and also a vibrant metropolis with an economic output exceeding one trillion yuan. As a large enterprise specializin...
