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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"}}
PC300-7LC PC300-7K Top Roller OEM Replacement 207-30-00550
This heavy-duty carrier top roller is a 1:1 OEM direct replacement for PC300-7LC long crawler and PC300-7K heavy-duty excavators, with standard OEM part number 207-30-00550. Perfectly matching original mounting dimensions and bolt holes, it requires no cutting, drilling or any on-site modification. It effectively supports track operation, avoids track sagging and walking vibration, and optimizes overall undercarriage running performance for long-hour heavy-load engineering fleets.
Specification
OEM Part Number
207-30-00550
Applicable Excavator Model
PC300-7LC / PC300-7K
Machining Tolerance
±0.01mm CNC ultra-precision machining
Heat Treatment Process
Overall quenching + stress relief tempering
Applicable Working Scenarios
Large quarry mining, high-grade road construction, heavy earthmoving, muddy wet sites, high-impact harsh working conditions
Installation Type
Plug-and-play OEM direct replacement
Applicable Working Environments
PC300-7LC long track and PC300-7K reinforced heavy-duty excavators adopt upgraded lengthened crawler and strengthened chassis, bearing higher track load than standard PC300-7 machines. They are widely applied in large quarry projects, infrastructure construction and continuous heavy earthmoving work. Long-term gravel extrusion, muddy water soaking and frequent walking impact bring extreme load to undercarriage top rollers. This specially reinforced top roller is customized for high-load long-track chassis, keeping stable running performance all day long.
Core Production & Heat Treatment Process
Adopt extra thickened one-piece forging steel blank to adapt to super high load of long-track and reinforced chassis. Dual standard heat treatment is adopted: integral quenching improves surface hardness to resist long-term gravel abrasion; secondary tempering eliminates internal metal stress to prevent shell deformation under strong impact. All mounting holes and matching contact surfaces are processed by precision CNC machine tools, with tolerance strictly controlled within 0.01mm, fully matching original factory OEM assembly standards.
On-site Installation Steps
Raise the excavator track with a hydraulic jack to separate track from ground and release partial track tension
Remove fixing bolts of the old top roller, take out original roller and clean sediment and dust on the mounting base
Place the new top roller in original installation position, align reserved bolt holes accurately
Lock all bolts with standard factory torque, reset track tension and conduct track idle running test
Check no abnormal vibration or friction noise to finish whole installation work
Product Advantages
Universal fit for PC300-7LC long track and PC300-7K reinforced heavy-duty models
Thickened roller shell structure bears higher chassis load without deformation
High-precision overall machining eliminates track offset and walking vibration
Heavy-duty floating seal isolates external mud and dust steadily
Complete dual heat treatment greatly extends service life under heavy working conditions
Direct bolt-on installation saves field maintenance time and labor cost
Customer Application Case
A professional large quarry fleet owns dozens of PC300-7LC and PC300-7K excavators working with full-load operation every day. After matching with our OEM-standard top rollers, all undercarriage accessories keep stable operation over 1800 working hours with intact shell and stable sealing performance, cutting annual undercarriage overall maintenance cost by 34%.
FAQ
Q1: Can this top roller fit PC300-7LC and PC300-7K universally?
A: Yes, OEM part number 207-30-00550 is exclusive for these two upgraded heavy-duty models, 100% consistent installation size, no modification required.
Q2: What is the difference between this roller and ordinary PC300-7 top roller?
A: This roller adopts thickened shell and reinforced internal structure, specially upgraded for higher load of long track and K-version reinforced chassis, with better impact resistance and durability.
Q3: Can you provide official inspection reports for bulk orders?
A: Yes, we can provide hardness test reports and dimensional inspection reports to support customer bulk order quality inspection and customs clearance.
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...
