{"product_id":"john-deere-644h-4wd-loader-644h-mh-material-handler-service-repair-manual-tm1638-pdf","title":"John Deere 644H 4WD Loader \u0026 644H MH Material Handler Technical Service Repair Manual TM1638 - PDF Download","description":"\u003ch2\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eDownload - 644H 4WD Loader \u0026amp; 644H MH Material Handler Technical Service Repair Manual TM1638 PDF \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eThe John Deere 644H 4WD Loader and 644H MH Material Handler Technical Service Repair Manual TM1638 is the complete factory repair reference for both the John Deere 644H standard wheel loader and the 644H MH Material Handler — 544 pages of detailed factory repair procedures, precise engineering specifications, complete hydraulic schematics, full electrical wiring diagrams, and comprehensive component overhaul guidance covering every repairable system on both the 644H and 644H MH configurations in a single authoritative factory document.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eWhether the job is a full H-Series PowerTech engine overhaul, an electronically controlled powershift transmission rebuild, a load-sensing hydraulic pump overhaul, a front or rear axle teardown with planetary final drive rebuild, a loader cylinder overhaul on the standard 644H, a material handler boom cylinder overhaul on the 644H MH, a grapple system hydraulic component overhaul, a torque converter rebuild, a load-sensing steering system overhaul, an electrohydraulic loader control valve overhaul, a wet disc brake system overhaul, an articulated frame service, a ride control system component repair, an H-Series CAN bus multi-ECU electronic control system service, or a complete electrical system diagnosis — TM1638 has the correct factory repair procedure for every job on both the 644H Loader and the 644H MH Material Handler.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eBuilt for the 644H 4WD Loader and 644H MH Material Handler\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eThe John Deere 644H is a full-size H-Series articulated four-wheel drive wheel loader powered by the H-Series PowerTech diesel engine with electronically controlled powershift transmission, load-sensing hydraulics with electrohydraulic implement control, wet disc brakes, and optional ride control — built for heavy-duty construction, aggregate, quarry, and material handling production applications. The 644H MH is the material handler variant on the same proven platform — configured with a purpose-built MH boom, hydraulic grapple or log fork, modified hydraulic circuits with increased flow capacity for continuous high-cycle grapple work, and adjusted counterweight configuration for MH stability requirements in sawmill, wood fiber, and bulk material handling environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eBoth configurations share the same fundamental H-Series chassis, engine, transmission, axles, and hydraulic system architecture — with the MH-specific boom, grapple system, MH hydraulic circuits, and MH counterweight configuration documented as distinct repair sections within TM1638. This shared architecture makes TM1638 an efficient single repair reference for both machines, with all MH-specific repair content clearly identified and documented separately throughout the 544 pages.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eMH Material Handler Manual Details:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003ePDF File Size : 13.9 MB\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eTotal pages : 544\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eDocument Number: TM1638 \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eModel : 644H 4WD Loader \u0026amp; 644H MH Material Handler\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eFormat: PDF Digital Download\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eManual Language: English\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSupported Devices : PC, Mac, iOS, Android\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003ePublication Date : 15JAN04\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eDelivery : Instant access after purchase\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eFile Format : PDF — Downloadable\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eWhat's Inside TM1638 - Manual Contents:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 00-General Information\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0001-Safety Information\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 01-Wheels\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0110-Powered Wheels And Fasteners\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 02-Axles And Suspension Systems \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0200-Removal And Installation\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0225-Axle Shafts And U-Joints\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0250-Axle Shaft, Bearings, Reduction Gears\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0260-Hydraulic System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 03-Transmission\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0300-Removal And Installation\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0350-Gears, Shafts, Bearings And Power\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eShift Clutch\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0360-Hydraulic System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0399-Dealer Fabricated Tools\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 04-Engine\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0400-Removal And Installation\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 05-Engine Auxiliary Systems \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0505-Cold Weather Starting Aids\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0510-Cooling System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0515-Speed Controls\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0520-Intake System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0530-External Exhaust System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0560-External Fuel Supply Systems\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 07-Dampener Drive\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0752-Elements\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 09-Steering System \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 0960-Hydraulic System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 10-Service Brakes \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1011-Active Elements \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1060-Hydraulic System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 11-Park Brake\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1111-Active Elements\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1160-Hydraulic System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 17-Frame Or Supporting Structure\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1740-Frame Installation\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1746-Frame Bottom Guards\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1749-Chassis Weights\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 18-Operator's Station\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1800-Removal And Installation\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1810-Operator Enclosure\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1830-Heating And Air Conditioning \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1899-Dealer Fabricated Tools\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 19-Sheet Metal And Styling \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1910-Hood Or Engine Enclosure \u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 1921-Grille And Grille Housing\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eSECTION 31-Loader\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 3102-Bucket\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 3140-Frames\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 3160-Hydraulic System\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eGroup 3199-Dealer Fabricated Tools\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eFAQ: 644H 4WD Loader \u0026amp; 644H MH Material Handler (TM1638)\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eQ: Does TM1638 cover both the 644H standard Loader and the 644H MH Material Handler?\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eYes. TM1638 covers both the John Deere 644H 4WD Loader and the 644H MH Material Handler in complete factory repair detail. All MH-specific repair content including 644H MH boom cylinder overhaul, grapple cylinder overhaul, grapple jaw service, MH-specific hydraulic control valve overhaul, and all MH-specific torque specifications and hydraulic values are documented as dedicated sections clearly identified throughout the 544 pages.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eQ: How many pages does TM1638 contain?\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eTM1638 contains 544 pages of complete factory repair information covering every repairable system on both the 644H and 644H MH including H-Series PowerTech engine, electronically controlled powershift transmission, load-sensing hydraulic pump, front and rear axles with planetary final drives, standard 644H electrohydraulic loader control valve, 644H MH boom and grapple hydraulic system, all cylinders, load-sensing steering, wet disc brakes, ride control, articulated frame, H-Series CAN bus multi-ECU system, and complete wiring diagrams.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eQ: Is this the official John Deere factory repair manual?\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eYes. TM1638 is the original technical service repair manual written and published directly by John Deere for the 644H and 644H MH. All repair procedures, torque specifications, hydraulic values, MH boom and grapple specifications, H-Series wear limits, and wiring diagrams are factory-accurate John Deere engineering data.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eQ: What format is it and when will I receive it?\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003ePDF digital download with instant access immediately after purchase. Compatible with PC, Mac, iOS, and Android. No shipping, no backorders — immediate delivery.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eHow to Download Your Manual:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003ePurchase 644H 4WD Loader \u0026amp; 644H MH Material Handler Repair Manual from our website.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eAfter successful payment, you will receive an order confirmation email.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eThe email will contain a secure download link for your manual.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eClick the download link to instantly download the PDF file to your device.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003e\n\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eIf you do not see the email, please check your Spam or Junk folder.\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003eFor any issues, contact our support team for assistance.\u003c\/span\u003e\n\u003c\/h4\u003e","brand":"Repair Manuals PDF","offers":[{"title":"Default Title","offer_id":50113986199772,"sku":null,"price":49.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5247\/3308\/files\/644H4WDLoader_644HMHMaterialHandlerTechnicalServiceRepairManualTM1638.png?v=1777013305","url":"https:\/\/repairmanualspdf.com\/products\/john-deere-644h-4wd-loader-644h-mh-material-handler-service-repair-manual-tm1638-pdf","provider":"Repair Manuals PDF","version":"1.0","type":"link"}