2005–2006 Honda TRX400FA/FGA FourTrax Rancher AT ATV Owner's Manual (31HN7620)

Honda Motor Co., Ltd. owner's manual 31HN7620 covers the 2005–2006 Honda TRX400FA and TRX400FGA FourTrax Rancher AT, including the GPScape-equipped TRX400FGA. It documents vehicle operation, scheduled maintenance and owner-level troubleshooting.

Text search and navigation: PDF text search and embedded bookmarks are not available. The printed contents pages and index provide section and topic references.

• Drive controls: Automatic and ESP shifting, 2WD/4WD selection, reverse operation, electric and recoil starting, and oil change indicator reset.

• GPScape navigation: TRX400FGA satellite status, position-fix recovery, waypoint marking, coordinate entry, compass direction display and automatic clock adjustment.

• Fluids and filtration: Engine oil and filter replacement, rear final gear case and front differential oil changes, foam air cleaner service and drain-tube cleaning.

• Engine adjustments: Throttle freeplay inspection and adjustment, choke cable checks, idle speed adjustment, spark plug inspection and replacement, and spark arrester service.

• Brakes and tires: Front brake lining clearance adjustment, rear brake freeplay adjustment, shoe-wear checks, tire inspection, and emergency wheel removal and installation.

• Electrical and fault checks: Battery removal and charging, main and shift motor fuse identification, fuse replacement, and starting and poor-running troubleshooting tables.

This manual is suited to owners with basic mechanical skills and hand tools for routine maintenance, with more demanding work directed to qualified mechanics.

Operator and System Controls Overview

The control illustrations identify the starting primer knob, choke knob, throttle lever, engine stop switch and parking brake lock lever. Multi-function display views distinguish the FA and FGA instrument layouts, while shift lever drawings show the Drive, Neutral and Reverse positions.

Starting instructions address a flooded engine and recoil starter use when the battery is low. The accessory socket and trailer hitch sections explain their operating limits, and loading guidance separates rider, cargo, accessory and trailer tongue loads.

GPScape Navigation and Position-Fix Problems

The GPScape sections apply specifically to the TRX400FGA. Satellite Status illustrations distinguish an unavailable position fix from 2D and 3D navigation, while the startup section addresses failure to acquire a position.

Waypoint instructions cover both marking your current location and entering a destination's latitude and longitude. The GPS Mode Display illustrations and Compass Direction Indicator table explain the information shown while navigating.

GPScape provides straight-line distance and direction to a waypoint rather than a mapped route. The manual also explains why heading information depends on vehicle movement.

Routine Maintenance and Repair Scope

The maintenance schedule distinguishes owner tasks from work requiring additional tools and service information. It also identifies items needing more frequent attention in dusty, wet or muddy conditions.

Lubrication and filters: Oil recommendations, fill capacities and fastener torques accompany the service procedures. The oil filter illustration identifies the cover, spring, washer and O-rings. Incorrect oil filter installation can cause serious engine damage; twisting or wringing the foam air cleaner can tear the filter material.

Engine service limits: This owner's manual does not replace the separate Honda Service Manual for internal engine or transmission repair. It supplies the valve-clearance specification, but refers valve adjustment procedures and high-altitude carburetor jet installation to that separate publication.

Storage preparation, return-to-service checks and transport tie-down illustrations are also included. These sections address fuel-system preparation, battery storage and securing the ATV for transport.

Drum Brakes, Tires and Electrical Troubleshooting

The brake chapters distinguish the hydraulically operated front drums from the mechanical rear drum. They include lining-wear limits, rear brake wear-indicator drawings and checks for water inside the brakes. Brake bleeding and shoe replacement are referred to a Honda dealer.

Tire repair guidance distinguishes temporary plugs from professional permanent repairs. Wheel installation instructions include wheel-nut orientation and tightening specifications.

Starting problems: The troubleshooting tables separate a starter that does not turn from one that turns without starting the engine. This helps you select the relevant basic checks before arranging a repair, instead of treating every starting problem as the same fault.

Further guidance addresses transmission warning displays, high oil temperature and a weak battery. Fuse-location drawings identify the main, shift motor and circuit fuses; battery instructions cover removal, installation, storage and charging.

Use appropriate protective equipment and support the ATV securely for brake or wheel work; follow the manual's maintenance safety precautions.

Printable PDF and Included Pages

Supplied as one printable, English-language 286-page PDF: 272 numbered manual pages, nine cover and introductory pages, four Quick Reference pages and one back cover. All of these pages are included in the total.