{"id":47992,"date":"2026-01-16T00:45:04","date_gmt":"2026-01-16T05:45:04","guid":{"rendered":"https:\/\/allparts.expert\/parts\/uncategorized\/caterpillar-121-5721-shaft-cluster-gear-1215721\/"},"modified":"2026-01-16T00:45:07","modified_gmt":"2026-01-16T05:45:07","slug":"caterpillar-121-5721-shaft-cluster-gear-1215721","status":"publish","type":"product","link":"https:\/\/allparts.expert\/es\/parts\/mining\/caterpillar-121-5721-shaft-cluster-gear-1215721\/","title":{"rendered":"CATERPILLAR 121-5721 Shaft-Cluster Gear 1215721"},"content":{"rendered":"

Caterpillar 121-5721 Shaft-Cluster Gear \u2013 OEM-Grade Durability and Precision for Heavy Equipment<\/strong><\/p>\n

The Caterpillar 121-5721 Shaft-Cluster Gear is engineered to meet the rigorous demands of industrial and mining applications, ensuring optimal drivetrain performance across a wide range of Caterpillar machinery. Compatible with key models such as the KNS-3516B Industrial Engine, 4CS-5130B Excavator, and multiple off-highway trucks including 4YC-777B, 3PR-777D, and AGC-777D, this gear is also suitable for track-type tractors like the 4HK-D11N and wheel-type loaders such as the 7HR-992G. Manufactured with high-grade alloy steel and precision metallurgy, the shaft-cluster gear boasts exacting dimensions and tooth profiles designed to withstand extreme load conditions and torque fluctuations inherent in heavy-duty operations.<\/p>\n

This shaft-cluster gear delivers superior mechanical strength and wear resistance, critical for maintaining drivetrain integrity and minimizing downtime in harsh environments. Its robust construction ensures consistent power transmission and smooth gear meshing, reducing vibration and noise while enhancing overall equipment efficiency. The 121-5721 gear\u2019s compatibility with a broad spectrum of Caterpillar models underscores its versatility and reliability, making it an essential replacement part for maintaining OEM performance standards. Investing in this component guarantees extended service life and optimal operational output, crucial for maximizing productivity in mining, construction, and industrial sectors.<\/p>\n

\ud83d\udd17 For detailed specifications and to purchase the Caterpillar 121-5721 Shaft-Cluster Gear, visit the official product page at Caterpillar 121-5721 Shaft-Cluster Gear on AllParts Expert<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

KNS-3516B Engine – Industrial
\n4CS-5130B Excavator
\n4YC-777B Off-highway Truck
\n3PR-777D Off-highway Truck
\nAGC-777D Off-highway Truck
\n4AR-793C Off-highway Truck
\n5ER-776D Off-highway Truck
\nAFS-776D Off-highway Truck
\n4XJ-777C Off-highway Truck
\n2YW-777D Off-highway Truck
\nFKR-777D Off-highway Truck
\n4GZ-793C Off-highway Truck
\nATY-793C Off-highway Truck
\nCBR-793C Off-highway Truck
\nFDB-793D Off-highway Truck
\n4HK-D11N Track-type Tractor
\n74Z-D11N Track-type Tractor
\n7PZ-D11R Track-type Tractor
\n9TR-D11R Track-type Tractor
\n9XR-D11R Track-type Tractor
\nAAF-D11R Track-type Tractor
\n1JW-854G Wheel Dozer
\nA4W-854G Wheel Dozer
\nAMP-854G Wheel Dozer
\n7HR-992G Wheel-type Loader
\nADZ-992G Wheel-type Loader
\nAZX-992G Wheel-type Loader<\/p>","protected":false},"featured_media":47503,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_joinchat":[]},"product_brand":[36],"machine-type":[77459],"model_no":[2598,4984,2457,2552,2542,2458,1379,1263,8176,1659,8524,1824],"product_cat":[144],"product_tag":[312768,312782,312757,312762,312774,312779,312756,312778,312771,312785,312781,312760,312766,312770,312759,312780,312776,312754,312783,312764],"class_list":{"0":"post-47992","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-caterpillar","7":"machine-type-engine-industrial","8":"model_no-3516b","9":"model_no-5130b","10":"model_no-776d","11":"model_no-777b","12":"model_no-777c","13":"model_no-777d","14":"model_no-793c","15":"model_no-793d","16":"model_no-854g","17":"model_no-992g","18":"model_no-d11n","19":"model_no-d11r","20":"product_cat-mining","21":"product_tag-121-5721-drive-gear-for-off-highway-truck","22":"product_tag-121-5721-gear-for-1jw-854g-dozer","23":"product_tag-121-5721-heavy-machinery-shaft","24":"product_tag-121-5721-industrial-engine-gear","25":"product_tag-121-5721-shaft-cluster-for-4hk-d11n","26":"product_tag-121-5721-shaft-cluster-for-7hr-992g-loader","27":"product_tag-cat-121-5721-cluster-gear-shaft","28":"product_tag-cat-121-5721-heavy-equipment-gear","29":"product_tag-cat-121-5721-mining-equipment-gear","30":"product_tag-cat-121-5721-part-for-heavy-machinery-maintenance","31":"product_tag-cat-121-5721-spare-cluster-gear-shaft","32":"product_tag-cat-121-5721-spare-part","33":"product_tag-cat-121-5721-wheel-dozer-shaft-cluster","34":"product_tag-caterpillar-121-5721-excavator-gear-part","35":"product_tag-caterpillar-121-5721-gear-assembly","36":"product_tag-caterpillar-121-5721-gear-for-wheel-type-loader","37":"product_tag-caterpillar-121-5721-replacement-part","38":"product_tag-caterpillar-121-5721-shaft-cluster-gear","39":"product_tag-caterpillar-121-5721-shaft-cluster-gear-oem","40":"product_tag-caterpillar-121-5721-track-type-tractor-gear","42":"first","43":"instock","44":"shipping-taxable","45":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product\/47992","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/comments?post=47992"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/media\/47503"}],"wp:attachment":[{"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/media?parent=47992"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product_brand?post=47992"},{"taxonomy":"machine-type","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/machine-type?post=47992"},{"taxonomy":"model_no","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/model_no?post=47992"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product_cat?post=47992"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product_tag?post=47992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}