John Deere 644H 4WD Loader & 644H MH Material Handler Technical Service Repair Manual TM1638 - PDF Download

Download - 644H 4WD Loader & 644H MH Material Handler Technical Service Repair Manual TM1638 PDF 

The 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.

Whether 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.

Built for the 644H 4WD Loader and 644H MH Material Handler

The 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.

Both 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.

MH Material Handler Manual Details:

PDF File Size : 13.9 MB
Total pages : 544
Document Number: TM1638 
Model : 644H 4WD Loader & 644H MH Material Handler
Format: PDF Digital Download
Manual Language: English
Supported Devices : PC, Mac, iOS, Android
Publication Date : 15JAN04
Delivery : Instant access after purchase
File Format : PDF — Downloadable

What's Inside TM1638 - Manual Contents:

SECTION 00-General Information
Group 0001-Safety Information
SECTION 01-Wheels
Group 0110-Powered Wheels And Fasteners
SECTION 02-Axles And Suspension Systems 
Group 0200-Removal And Installation
Group 0225-Axle Shafts And U-Joints
Group 0250-Axle Shaft, Bearings, Reduction Gears
Group 0260-Hydraulic System
SECTION 03-Transmission
Group 0300-Removal And Installation
Group 0350-Gears, Shafts, Bearings And Power
Shift Clutch
Group 0360-Hydraulic System
Group 0399-Dealer Fabricated Tools
SECTION 04-Engine
Group 0400-Removal And Installation
SECTION 05-Engine Auxiliary Systems 
Group 0505-Cold Weather Starting Aids
Group 0510-Cooling System
Group 0515-Speed Controls
Group 0520-Intake System
Group 0530-External Exhaust System
Group 0560-External Fuel Supply Systems
SECTION 07-Dampener Drive
Group 0752-Elements
SECTION 09-Steering System 
Group 0960-Hydraulic System
SECTION 10-Service Brakes 
Group 1011-Active Elements 
Group 1060-Hydraulic System
SECTION 11-Park Brake
Group 1111-Active Elements
Group 1160-Hydraulic System
SECTION 17-Frame Or Supporting Structure
Group 1740-Frame Installation
Group 1746-Frame Bottom Guards
Group 1749-Chassis Weights
SECTION 18-Operator's Station
Group 1800-Removal And Installation
Group 1810-Operator Enclosure
Group 1830-Heating And Air Conditioning 
Group 1899-Dealer Fabricated Tools
SECTION 19-Sheet Metal And Styling 
Group 1910-Hood Or Engine Enclosure 
Group 1921-Grille And Grille Housing
SECTION 31-Loader
Group 3102-Bucket
Group 3140-Frames
Group 3160-Hydraulic System
Group 3199-Dealer Fabricated Tools

FAQ: 644H 4WD Loader & 644H MH Material Handler (TM1638)

Q: Does TM1638 cover both the 644H standard Loader and the 644H MH Material Handler?
Yes. 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.

Q: How many pages does TM1638 contain?
TM1638 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.

Q: Is this the official John Deere factory repair manual?
Yes. 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.

Q: What format is it and when will I receive it?
PDF digital download with instant access immediately after purchase. Compatible with PC, Mac, iOS, and Android. No shipping, no backorders — immediate delivery.

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