{"id":51640,"date":"2026-01-27T20:12:14","date_gmt":"2026-01-28T01:12:14","guid":{"rendered":"https:\/\/allparts.expert\/parts\/uncategorized\/caterpillar-138-4123-gear-idler-1384123\/"},"modified":"2026-01-27T20:12:17","modified_gmt":"2026-01-28T01:12:17","slug":"caterpillar-138-4123-gear-idler-1384123","status":"publish","type":"product","link":"https:\/\/allparts.expert\/es\/parts\/mining\/caterpillar-138-4123-gear-idler-1384123\/","title":{"rendered":"CATERPILLAR 138-4123 Gear-Idler 1384123"},"content":{"rendered":"

Caterpillar 138-4123 Gear-Idler \u2013 OEM-Grade Durability for Articulated Dump Trucks and Heavy Equipment<\/strong><\/p>\n

The Caterpillar 138-4123 Gear-Idler is a precision-engineered drivetrain component designed to optimize power transmission and load distribution in a wide range of heavy machinery, including articulated dump trucks such as the 8TF-D400D, 2JJ-D40D, and 2YR-D400E models, as well as cold planers and earthmoving compactors. Manufactured using high-grade alloy steel with advanced heat treatment processes, this gear-idler features robust metallurgy that ensures exceptional resistance to wear, fatigue, and harsh load conditions. With exacting dimensions tailored for seamless integration, the 138-4123 maintains optimal gear mesh and alignment, reducing operational noise and vibration while enhancing drivetrain efficiency.<\/p>\n

Technically, the 138-4123 Gear-Idler supports critical drivetrain functions by maintaining consistent torque transfer and minimizing backlash under variable load scenarios. Its precision-machined teeth profile and hardened surface treatment improve load capacity and extend service life, even in abrasive mining and construction environments. This part meets OEM specifications, guaranteeing compatibility and performance parity with original Caterpillar equipment. Investing in this gear-idler ensures improved machine uptime, reduced maintenance intervals, and superior operational reliability across models such as the 9LR-D350E articulated dump truck and 3TK-PM-565 cold planer.<\/p>\n

\ud83d\udd17 For detailed specifications and to purchase the Caterpillar 138-4123 Gear-Idler, visit the official product page at Caterpillar 138-4123 Gear-Idler on AllParts Expert<\/a>.<\/p>\n

\n

SEO Keywords:<\/strong> Caterpillar 138-4123 Gear-Idler, Caterpillar gear idler replacement, articulated dump truck spare parts, OEM Caterpillar drivetrain parts, heavy equipment gear idler, Caterpillar mining equipment parts, durable gear idler for Caterpillar machines<\/p>","protected":false},"excerpt":{"rendered":"

8TF-D400D Articulated Dump Truck <\/p>\n

2JJ-D40D Articulated Dump Truck <\/p>\n

2YR-D400E Articulated Dump Truck <\/p>\n

9LR-D350E Articulated Dump Truck <\/p>\n

3FD-D35HP Articulated Dump Truck <\/p>\n

1MD-D400 Articulated Dump Truck <\/p>\n

3TK-PM-565 Cold Planer <\/p>\n

8GS-PM-565B Cold Planer <\/p>\n

7FR-836 Earthmoving Compactor <\/p>\n

3RL-836 Earthmoving Compactor <\/p>\n

6TB-3406C Engine – Industrial <\/p>\n

6BR-3406E Engine – Industrial <\/p>\n

3LW-3456 Engine – Industrial <\/p>\n

BEM-C-15 Engine – Industrial <\/p>\n

BFM-C-16 Engine – Industrial <\/p>\n

N5H-C15 Engine – Industrial <\/p>\n

N8H-C18 Engine – Industrial <\/p>\n

3ER-3406C Engine – Industrial <\/p>\n

JRE-C15 Engine – Industrial <\/p>\n

MCW-C15 Engine – Industrial <\/p>\n

WJH-C18 Engine – Industrial <\/p>\n

WRH-C18 Engine – Industrial <\/p>\n

WB4-TH43-C18 Engine – Industrial <\/p>\n

MDP-C-18 Engine – Truck <\/p>\n

7KK-24H Motor Grader <\/p>\n

LKZ-TR43-C18L Oem Solutions <\/p>\n

JDK-C15 Petroleum Products <\/p>\n

JDY-C15 Petroleum Products <\/p>\n

WJW-C18 Petroleum Products <\/p>\n

PDM-CX31-C15I Petroleum Products <\/p>\n

PBN-TH35-C15I Petroleum Products <\/p>\n

PFW-CX31-P600 Petroleum Products <\/p>\n

SMS-TH35-E81 Petroleum Products <\/p>\n

31Z-589 Pipelayer <\/p>\n

58X-98<\/p>","protected":false},"featured_media":50672,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_joinchat":[]},"product_brand":[36],"machine-type":[21022],"model_no":[13195,13196,75,6689,39312,39313,21404,20584,1671,13198,1672,1673,19942,15342,25996,28215,15341,19940,19941,21059,1670,21057,7877,6720,18105,18106,1674,1675,15469,15471,15470,15472,38118,40200,36364,2943,66,28677,2946,2678,95,19935,7163,7168,7169,21042,7164,21043,19937,1667,18107,1669,1666,19877,19875,28678,28679,7179,26009],"product_cat":[144],"product_tag":[346948,346941,346940,346933,346939,346943,346936,346951,346945,346934,346942,346937,346946,346950,346947,346949,346944,346938,346952,346935],"class_list":{"0":"post-51640","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-caterpillar","7":"machine-type-articulated-dump-truck","8":"model_no-10su","9":"model_no-10u","10":"model_no-24h","11":"model_no-3406c","12":"model_no-3406e","13":"model_no-39313","14":"model_no-21404","15":"model_no-20584","16":"model_no-58l","17":"model_no-13198","18":"model_no-59l","19":"model_no-59n","20":"model_no-19942","21":"model_no-834b","22":"model_no-834s","23":"model_no-834u","24":"model_no-15341","25":"model_no-8a","26":"model_no-8s","27":"model_no-8u","28":"model_no-1670","29":"model_no-983b","30":"model_no-988b","31":"model_no-988f","32":"model_no-9c","33":"model_no-9s","34":"model_no-9su","35":"model_no-9u","36":"model_no-ad40","37":"model_no-ad45","38":"model_no-ae40","39":"model_no-ae40-ii","40":"model_no-c-15","41":"model_no-c-16","42":"model_no-c-18","43":"model_no-c15","44":"model_no-c18","45":"model_no-cx31-c15i","46":"model_no-cx31-p600","47":"model_no-d10n","48":"model_no-d10r","49":"model_no-d326","50":"model_no-d350e","51":"model_no-d35hp","52":"model_no-d400","53":"model_no-d400d","54":"model_no-d400e","55":"model_no-d40d","56":"model_no-d8l","57":"model_no-d9-gc","58":"model_no-d9l","59":"model_no-d9n","60":"model_no-d9r","61":"model_no-pm-565","62":"model_no-pm-565b","63":"model_no-th35-c15i","64":"model_no-th35-e81","65":"model_no-th43-c18","66":"model_no-tr43-c18l","67":"product_cat-mining","68":"product_tag-138-4123-earthmoving-compactor-gear-idler","69":"product_tag-138-4123-gear-idler-for-2jj-d40d-truck","70":"product_tag-138-4123-gear-idler-for-8tf-d400d-truck","71":"product_tag-138-4123-gear-idler","72":"product_tag-138-4123-heavy-machinery-gear-idler","73":"product_tag-138-4123-idler-gear-for-9lr-d350e-truck","74":"product_tag-138-4123-idler-gear-for-articulated-dump-truck","75":"product_tag-138-4123-pipelayer-gear-idler","76":"product_tag-138-4123-spare-part-for-articulated-dump-truck","77":"product_tag-cat-138-4123-gear-idler","78":"product_tag-cat-138-4123-gear-idler-for-2yr-d400e-truck","79":"product_tag-cat-138-4123-idler-gear","80":"product_tag-cat-138-4123-industrial-gear-idler","81":"product_tag-cat-138-4123-motor-grader-idler-gear","82":"product_tag-caterpillar-138-4123-cold-planer-gear-idler","83":"product_tag-caterpillar-138-4123-engine-compatible-gear-idler","84":"product_tag-caterpillar-138-4123-gear-idler-for-3fd-d35hp-truck","85":"product_tag-caterpillar-138-4123-gear-idler-replacement","86":"product_tag-caterpillar-138-4123-oem-solutions-gear-idler","87":"product_tag-caterpillar-138-4123-parts","89":"first","90":"instock","91":"shipping-taxable","92":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product\/51640","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=51640"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/media\/50672"}],"wp:attachment":[{"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/media?parent=51640"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product_brand?post=51640"},{"taxonomy":"machine-type","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/machine-type?post=51640"},{"taxonomy":"model_no","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/model_no?post=51640"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product_cat?post=51640"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/allparts.expert\/es\/wp-json\/wp\/v2\/product_tag?post=51640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}