{"title":"Komatsu PC40MR Tracks \u0026 Parts","description":"\u003cp\u003eKeep your \u003cstrong\u003eKomatsu PC40MR\u003c\/strong\u003e in the dirt with precision-fit \u003cstrong\u003e400x72.5Nx72\u003c\/strong\u003e tracks and matched undercarriage parts. OEM-quality build, 24-month warranty, free freight.\u003c\/p\u003e\u003ch3\u003eTread Options for the Komatsu PC40MR\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eDirectional\u003c\/strong\u003e — The excavation specialist — directional tread optimized for digging and slope work.\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch3\u003eComplete the Komatsu PC40MR Rebuild\u003c\/h3\u003e\u003cp\u003ePair your tracks with the right undercarriage parts for the \u003cstrong\u003eKomatsu PC40MR\u003c\/strong\u003e:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/undercarriage-parts\"\u003eFront Idler\u003c\/a\u003e — OEM Part #9237507\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/collections\/undercarriage-parts\"\u003eTop Roller\u003c\/a\u003e — OEM Part #9239529\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAlso Fits These Machines\u003c\/h3\u003e\u003cp\u003eLooking for another machine? The \u003cstrong\u003e400x72.5Nx72\u003c\/strong\u003e size also fits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc40mr-1\"\u003eKomatsu PC40MR-1\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc40mrx\"\u003eKomatsu PC40MRX\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc40r\"\u003eKomatsu PC40R\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc45\"\u003eKomatsu PC45\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc45-1\"\u003eKomatsu PC45-1\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe TrackTECH Difference\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop-forged steel links\u003c\/strong\u003e for strength where the track meets the drive system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuous steel cord\u003c\/strong\u003e — up to 40% stronger than typical aftermarket tracks, resisting stretch and de-tracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium virgin rubber\u003c\/strong\u003e — anti-chunk compound built for long service life in abrasive conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision OEM alignment\u003c\/strong\u003e — a reinforced roller path keeps running smooth and vibration low.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUpgrade your Komatsu PC40MR today. Order online for free freight, or call \u003ca href=\"tel:8508167898\"\u003e(850) 816-7898\u003c\/a\u003e. Need a hand matching size and guide? Try the \u003ca href=\"\/pages\/track-finder\"\u003eTrack Finder\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eDirect Replacement Rubber Tracks for the Komatsu PC40MR\u003c\/h2\u003e\u003cp\u003eDirect replacement rubber tracks for the Komatsu PC40MR are built for heavy-duty compact equipment applications where traction, stability, and uptime matter. These tracks are designed for dependable grip, smooth travel, and consistent performance across dirt, clay, gravel, demolition debris, utility work, grading, land clearing, excavation, and mixed jobsite terrain.\u003c\/p\u003e\u003ch3\u003eHeavy-Duty Construction for Daily Work\u003c\/h3\u003e\u003cp\u003ePremium virgin rubber compounds help resist tearing, chunking, cracking, dry rot, and premature tread wear under demanding field conditions. Continuous steel cord reinforcement adds internal strength, helps reduce stretching, and supports stable track performance through repeated turning, travel, and loading.\u003c\/p\u003e\u003ch3\u003eOEM Fit Guarantee\u003c\/h3\u003e\u003cp\u003eMachine-specific sizing, steel link spacing, and guide lug geometry are built for proper undercarriage engagement on the Komatsu PC40MR. Precision-aligned fitment helps support smooth travel, stable tracking, reduced vibration, and reliable sprocket contact.\u003c\/p\u003e\u003ch3\u003eBuilt to Protect the Undercarriage System\u003c\/h3\u003e\u003cp\u003eA well-built rubber track helps improve machine control while limiting unnecessary stress on rollers, idlers, and sprockets. For contractors running Komatsu equipment, that means better ride quality, stronger traction, less downtime, and better value over the life of the track.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat size rubber track does the Komatsu PC40MR use?\u003c\/h3\u003e\u003cp\u003eThe Komatsu PC40MR uses a 400x72.5Nx72 rubber track. Note the N (narrow guide) guide-lug type — other guide types won't seat correctly on the rollers. Always confirm against your current track or the machine's spec plate, since some units shipped with more than one option.\u003c\/p\u003e\u003ch3\u003eWill this track fit my Komatsu PC40MR?\u003c\/h3\u003e\u003cp\u003eYes — this track is matched to the Komatsu PC40MR by size and tread pattern. If your machine has a serial break or factory option, send the serial number and we'll verify fitment before shipping.\u003c\/p\u003e\u003ch3\u003eHow do I confirm the right track size for my Komatsu PC40MR?\u003c\/h3\u003e\u003cp\u003eRead the size stamped on the inside of your current track, or measure width x pitch x links. Not sure? Message us and we'll match it.\u003c\/p\u003e\u003ch3\u003eDo you stock undercarriage parts for the Komatsu PC40MR?\u003c\/h3\u003e\u003cp\u003eYes — along with the rubber track we carry front idlers, top rollers for the Komatsu PC40MR, so you can refresh the whole undercarriage in one order.\u003c\/p\u003e\u003ch3\u003eDo Komatsu PC40MR tracks sell in pairs?\u003c\/h3\u003e\u003cp\u003eTracks are priced individually; a full machine needs two. Most owners replace both at once so wear stays even.\u003c\/p\u003e\u003ch3\u003eRelated Collections\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc55mr-3\"\u003eKomatsu PC55MR\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc30mr\"\u003eKomatsu PC30MR Tracks\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc27mr\"\u003eKomatsu PC27MR\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc35mr\"\u003eKomatsu PC35MR Tracks\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-pc20mr\"\u003eKomatsu PC20MR Tracks\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu-ck35\"\u003eKomatsu CK35\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/komatsu\"\u003eKomatsu Rubber Tracks \u0026amp; Undercarriage Parts\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"carrier-roller-9239529","title":"Hitachi ZX50 \/ ZX55U Top Roller | Part #CR9239529","description":"\u003csection class=\"tt-product-description\" aria-labelledby=\"product-overview\"\u003e \u003ch2 id=\"product-overview\"\u003eCarrier Roller | Part #CR9239529\u003c\/h2\u003e \u003cp\u003eThis carrier roller is a new aftermarket undercarriage replacement part built for compact equipment to help restore proper track movement, alignment, and machine reliability.\u003c\/p\u003e \u003ch3\u003eProduct details\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart type:\u003c\/strong\u003e Carrier Roller\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference part number:\u003c\/strong\u003e CR9239529\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New aftermarket replacement\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Compact equipment undercarriage repair\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eWhy this part matters\u003c\/h3\u003e \u003cp\u003eA worn carrier roller can cause track misalignment, accelerated track wear, vibration, and reduced undercarriage life. Replacing worn components helps the track system run straighter and protects the rest of the undercarriage.\u003c\/p\u003e \u003ch3\u003eBuild and fitment notes\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eDesigned to replace worn or damaged undercarriage components\u003c\/li\u003e \u003cli\u003eBuilt for contractor-grade compact equipment use\u003c\/li\u003e \u003cli\u003eSupports and guides the track system\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eRecommended with\u003c\/h3\u003e \u003cp\u003eFor best service life, inspect the matching rubber tracks, drive sprockets, rollers, and idlers at the same time. \u003ca href=\"\/pages\/request-a-quote\"\u003eContact our fitment team\u003c\/a\u003e to confirm the correct parts for your machine.\u003c\/p\u003e\n\u003ch3\u003eThe TrackTECH advantage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame-day shipping\u003c\/strong\u003e on in-stock orders placed before 12 PM CT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree Shipping\u003c\/strong\u003e to the Lower 48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-month warranty\u003c\/strong\u003e on materials and workmanship\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContractor pricing\u003c\/strong\u003e — bulk and fleet discounts available\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment verified before shipping\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e","brand":"TrackTECH","offers":[{"title":"Default Title","offer_id":52267964268856,"sku":"TT9239529","price":114.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0950\/3493\/3560\/files\/cr9239529-585192_44cfb051-ba87-4cc6-8e36-43c9e2906cb7.webp?v=1777382347"},{"product_id":"front-idler-9237507","title":"Hitachi ZX40U \/ ZX40U-2 Front Idler | Part #FI9237507","description":"\u003csection class=\"tt-product-description\" aria-labelledby=\"product-overview\"\u003e \u003ch2 id=\"product-overview\"\u003eHitachi ZX40U \/ ZX40U-2 Hitachi ZX40U \/ ZX40U-2 Front Idler | Part #FI9237507\u003c\/h2\u003e \u003cp\u003eThis front idler is a new aftermarket undercarriage replacement part built for compact equipment to help restore proper track movement, alignment, and machine reliability.\u003c\/p\u003e \u003ch3\u003eProduct details\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart type:\u003c\/strong\u003e Front Idler\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference part number:\u003c\/strong\u003e FI9237507\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New aftermarket replacement\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Compact equipment undercarriage repair\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eWhy this part matters\u003c\/h3\u003e \u003cp\u003eA worn front idler can cause track misalignment, accelerated track wear, vibration, and reduced undercarriage life. Replacing worn components helps the track system run straighter and protects the rest of the undercarriage.\u003c\/p\u003e \u003ch3\u003eBuild and fitment notes\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eDesigned to replace worn or damaged undercarriage components\u003c\/li\u003e \u003cli\u003eBuilt for contractor-grade compact equipment use\u003c\/li\u003e \u003cli\u003eGuides track tension and alignment\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eRecommended with\u003c\/h3\u003e \u003cp\u003eFor best service life, inspect the matching rubber tracks, drive sprockets, rollers, and idlers at the same time. \u003ca href=\"\/pages\/request-a-quote\"\u003eContact our fitment team\u003c\/a\u003e to confirm the correct parts for your machine.\u003c\/p\u003e\n\u003ch3\u003eThe TrackTECH advantage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame-day shipping\u003c\/strong\u003e on in-stock orders placed before 12 PM CT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree Shipping\u003c\/strong\u003e to the Lower 48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-month warranty\u003c\/strong\u003e on materials and workmanship\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContractor pricing\u003c\/strong\u003e — bulk and fleet discounts available\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment verified before shipping\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e","brand":"TrackTECH","offers":[{"title":"Default Title","offer_id":52267968397624,"sku":"TT9237507","price":513.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0950\/3493\/3560\/files\/fi9237507-585192_61616b83-65e3-43c5-9073-6898269f5086.webp?v=1777382448"},{"product_id":"400x72-5kx72-directional","title":"400x72.5Nx72 Rubber Track | Directional","description":"\u003csection class=\"tt-product-description\" aria-labelledby=\"product-overview\"\u003e \u003ch2 id=\"product-overview\"\u003e400x72.5Kx72 Rubber Track | Directional\u003c\/h2\u003e \u003cp\u003eThis replacement rubber track is built to fit Komatsu, Schaeff equipment while helping deliver dependable traction, ride quality, and jobsite uptime. It is a strong option for contractors replacing worn, torn, or dry-rotted tracks on compact construction equipment.\u003c\/p\u003e \u003ch3\u003eProduct details\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eTrack size:\u003c\/strong\u003e 400x72.5Kx72\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New aftermarket replacement\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e Individual track unless otherwise stated\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eBuilt for daily work\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eContinuous steel cable reinforcement for strength under load\u003c\/li\u003e \u003cli\u003eDurable rubber compound designed to resist wear, chunking, and cracking\u003c\/li\u003e \u003cli\u003ePrecision-molded guide lugs for stable tracking on compatible undercarriages\u003c\/li\u003e \u003cli\u003eDesigned for traction, flotation, and smooth operation across dirt, gravel, mud, and mixed jobsite surfaces\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrack Size:\u003c\/strong\u003e 400x72.5Kx72\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 400 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePitch:\u003c\/strong\u003e 72.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinks:\u003c\/strong\u003e 72\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTread Pattern:\u003c\/strong\u003e Directional\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Multi-machine — confirm by track size and link count\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe TrackTECH advantage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame-day shipping\u003c\/strong\u003e on in-stock orders placed before 12 PM CT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree Shipping\u003c\/strong\u003e to the Lower 48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-month warranty\u003c\/strong\u003e on materials and workmanship\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContractor pricing\u003c\/strong\u003e — bulk and fleet discounts available\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment verified before shipping\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e","brand":"TrackTECH","offers":[{"title":"Default Title","offer_id":52267969347896,"sku":"TNT400725N72HD","price":1737.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0950\/3493\/3560\/files\/16-directional-hero_50ae9b40-d593-450a-b8f2-008f9328a3f9.webp?v=1777385357"},{"product_id":"komatsu-pc40mr-rubber-tracks","title":"Komatsu PC40MR Rubber Tracks | 400x72.5Nx72","description":"\u003cp\u003e\u003cstrong\u003eKomatsu PC40MR Rubber Tracks\u003c\/strong\u003e — OEM grade replacement tracks engineered for contractor-grade performance.\u003c\/p\u003e\u003cp\u003eDirect OEM grade replacement for the Komatsu PC40MR. Track size: \u003cstrong\u003e400x72.5Kx72\u003c\/strong\u003e. Tread pattern: \u003cstrong\u003eDirectional\u003c\/strong\u003e.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuous Steel Cord\u003c\/strong\u003e — 40% stronger than competitor tracks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Virgin Rubber\u003c\/strong\u003e — anti-chunk, anti-tear compound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop-Forged Steel Links\u003c\/strong\u003e — precision OEM alignment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-Month Warranty\u003c\/strong\u003e — backed by TrackTECH's contractor guarantee\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrack Size:\u003c\/strong\u003e 400x72.5Kx72\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 400 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePitch:\u003c\/strong\u003e 72.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinks:\u003c\/strong\u003e 72\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTread Pattern:\u003c\/strong\u003e Directional\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Make:\u003c\/strong\u003e Komatsu\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Model:\u003c\/strong\u003e PC40MR\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe TrackTECH advantage\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame-day shipping\u003c\/strong\u003e on in-stock orders placed before 2 PM CT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree freight\u003c\/strong\u003e to the lower 48 states\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-month warranty\u003c\/strong\u003e on materials and workmanship\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContractor pricing\u003c\/strong\u003e — bulk and fleet discounts available\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment guaranteed\u003c\/strong\u003e — we verify before we ship\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TrackTECH","offers":[{"title":"Default Title","offer_id":52362277126456,"sku":"TT-PC40MR-400X725NX72-DR","price":1737.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0950\/3493\/3560\/files\/16-directional-hero_2c00ffd2-74bb-4e69-8c1e-7d20677cbd14.webp?v=1778634302"}],"url":"https:\/\/newrubbertrack.com\/collections\/komatsu-pc40mr.oembed","provider":"TrackTECH","version":"1.0","type":"link"}