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This carrier top roller is a 1:1 OEM direct replacement for CAT 120B excavator, matched with official part number 41-7345. No cutting, drilling or other secondary modification is required during replacement. It adapts to long-term heavy-duty onsite operation and solves common undercarriage running abnormalities of old CAT 120B fleets.
Item
Specification
OEM Part Number
41-7345
Applicable Excavator Model
CAT120B
Machining Tolerance
±0.01mm CNC ultra-precision machining
Heat Treatment Process
Overall quenching + stress relief tempering
Applicable Working Scenarios
Muddy construction site, gravel quarry, road renovation, rough earthmoving terrain
Installation Type
Plug-and-play OEM direct replacement
Applicable Working Environments
CAT 120B is mostly used in medium-load earthmoving and municipal reconstruction sites. Long-term muddy water immersion, gravel friction and continuous walking impact will cause ordinary aftermarket top rollers to appear track shaking, track sagging, internal oil leakage and shaft stagnation. This roller is manufactured to adapt to such harsh working conditions and keep stable running performance.
Core Production Technology
Adopt one-piece forging steel blank for integral forming. Double heat treatment is finished in production: quenching improves surface hardness to resist abrasive wear; tempering eliminates internal residual stress to avoid roller shell cracking under frequent impact. All mounting holes and assembly contact surfaces are precisely processed with error controlled within 0.01mm, fully consistent with original CAT factory dimensions.
On-site Installation Steps
Raise the excavator track with a hydraulic jack to separate the track from the ground and release partial track tension
Remove fixing bolts of the old top roller, take out the damaged roller and clean mounting base dust and sediment
Place the new OEM top roller in the original installation position, align reserved bolt holes accurately
Lock all fixing bolts with standard torque, reset track tension and test track idle running
Check no abnormal vibration or friction noise to finish installation
Optimized On-site Operation Performance
Stable size matching avoids track deviation and walking vibration
High-strength sealing structure prevents muddy water ingress and oil leakage
Integral heat treatment reduces roller shell fracture risk
Standard installation size shortens overall maintenance time
Real Customer Cooperation Case
A local Middle East machinery repair shop maintains batches of CAT 120B old-model excavators. Previously used generic top rollers only worked 650-800 working hours with frequent oil leakage. After replacing with our products, the rollers run stably over 1800 working hours without failure, cutting fleet undercarriage maintenance cost by 33%.
Frequently Asked Questions
Q1: Is this roller suitable for original CAT 120B old machine?
A: Yes, part number 41-7345 matches original factory drawing completely, suitable for all standard CAT 120B original machines.
Q2: Why do generic rollers fail easily on old CAT machines?
A: Most cheap aftermarket parts omit tempering process with tolerance over 0.05mm, mismatching old machine mounting base and causing fast wear.
Q3: Can you provide official test reports for bulk orders?
A: Yes, heat treatment report and dimension inspection report can be provided for wholesale orders.
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...
