Yamaha Grizzly 450 4x4 2009–2010 Service Manual OEM (P/N LIT-11626-23-27 / LIT-11616-KD-48)

• 742 PDF pages total - a 170-page Yamaha owner's manual, P/N LIT-11626-23-27, and a 572-page Yamaha service-manual package, P/N LIT-11616-KD-48.
• Model and publication coverage - the service package is labeled for 2009-2010 Grizzly 450 4WD models. It combines the YFM450FAR base manual with YFM450FAS, YFM450FAT, YFM45FGX, and YFM45FGY 2009 supplements; the owner's manual is specifically identified for YFM45FGZ and YFM45FGHZ.
• Engine and internal repair procedures cover engine removal and installation, cylinder head and valve service, piston and cylinder inspection, recoil starter and A.C. magneto work, crankcase separation, crankshaft and oil-pump service, and transmission inspection and assembly.
• V-belt and shaft-drive repair includes primary and secondary sheave disassembly, clutch service, middle-gear shimming and backlash checks, front differential and gear-motor diagnosis, CV-joint work, and final-drive pinion/ring-gear positioning and lash adjustment.
• Brake, steering, and suspension sections detail master-cylinder and caliper disassembly, hydraulic brake bleeding, wheel-hub and ball-joint service, steering-stem and knuckle work, front-arm repair, rear swingarm or rear-knuckle service, shock absorbers, and stabilizer components.
• Electrical fault isolation is organized around circuit diagrams and test charts for ignition, starting, charging, lighting, signals, cooling-fan control, and the 2WD/4WD selecting system, backed by model-specific full wiring diagrams.
• Owner-level operation and maintenance explains the On-Command 2WD/4WD and differential-lock controls, indicators, pre-operation checks, load and tire guidance, riding techniques, periodic maintenance charts, routine fluid service, and troubleshooting charts, with illustrated control, instrument, and component-location views.

This factory set puts the model-specific operating book and the cumulative workshop material in one package. Yamaha states that the service information was produced primarily for dealers and qualified mechanics, and it assumes a basic understanding of mechanical principles and machine-repair procedures. It is therefore suited to technicians and experienced owners who already have the tools and background required for the repair being attempted.

Factory Publication Breakdown

The 572-page service PDF contains a one-page package cover; a 70-page YFM450FAT section, LIT-11616-18-35 / 5ND-F8197-12; a 24-page YFM450FAS section, LIT-11616-17-25 / 5ND-F8197-11; an 81-page YFM45FGX section, LIT-11616-21-46 / 5ND-F8197-13; a 19-page YFM45FGY section, LIT-11616-22-47 / 5ND-F8197-14; a 375-page YFM450FAR base-manual section, LIT-11616-16-01 / 5ND-F8197-10; and two blank separator pages. These section counts include the associated wiring sheets placed at the back of the PDF. The service cover itself is marked "Pgs. 566," while 572 is the actual digital page count.

The separate 170-page owner's manual, Yamaha number 37S-F8199-11, is the first edition, published in April 2009. Its listed publication number is LIT-11626-23-27.

Workshop Depth and Reference Data

The service material uses Yamaha's factory format: exploded assembly views, numbered job charts, inspection criteria, removal and installation notes, and component-specific specifications. Reference sections supply tightening-torque tables, lubrication points, fluid data, wear limits, clearances, cable-routing drawings, and electrical test values.

Special-tool coverage is equally specific. Examples include the gear-lash measurement tool YM-01467 / 90890-01467, sheave spring compressor YM-04134 / 90890-04134, crankcase separating tool YU-01135-A / 90890-01135, ball-joint remover/installer set YM-01474 / 90890-01474, and pocket tester YU-03112 / 90890-03112. Those references help confirm the tooling expected before a repair is opened up.

Representative technical illustrations include the coolant-flow diagrams, oil-flow diagrams, ignition-system circuit diagram, 2WD/4WD selecting-system circuit diagram, front differential and final-drive exploded views, and the two-sheet YFM45FGY 2009 wiring diagram. Earlier-model wiring diagrams are retained because the later supplements expressly rely on the preceding base manual and supplements for complete procedures.

Repair Cautions and Scope

The drivetrain chapters warn that insufficient gear lash after assembly is destructive to the gear teeth, making the factory shimming and measurement material important during differential or final-drive repair. The brake chapters also explain that incorrect or mixed brake fluid can damage rubber seals, cause leakage, and reduce braking performance.

The owner's manual handles operation, safety, pre-ride inspection, and routine upkeep; it is not an internal overhaul guide. Full engine, drivetrain, chassis, and electrical repair depth comes from the service PDF. Brake-hydraulic work, drivetrain disassembly, and engine teardown require secure support of the ATV and close use of Yamaha's safety notes, specifications, and inspection limits.