Komatsu 66D turbo Wheeled Loader Operation and Maintenance Manual (2974627M1)

A 66D turbo loader usually lives in quarries, gravel pits, and busy yards, loading trucks all day and working around dust, vibration, and uneven ground. This Operation and Maintenance Manual is what I’d keep on hand to set a sensible service rhythm, so the machine is ready at the start of every shift and doesn’t surprise you with downtime. If, for example, the loader starts losing pushing power on a pile, I’d use this book to trace whether it’s likely an engine, driveline, or hydraulic issue before tearing into anything.

Applications & Use Cases

• Plan preventive services so filters, belts, and wear items get attention before they fail under load.
• Set up daily and weekly inspections that operators can follow to spot leaks, loose hardware, and abnormal noises early.
• Verify adjustment points after tire changes, linkage work, or steering repairs to keep the loader tracking straight.
• Cross-check machine identification when ordering parts or confirming compatibility with attachments.
• Troubleshoot performance complaints by isolating basic checks you can do in the yard before calling in major repairs.

FAQ

Q: Can I keep this manual on a tablet in the cab?

A: Yes, as long as the file is readable offline; just protect the device from dust and vibration.

Q: Is it worth printing sections of this manual?

A: Printing the routine service and inspection pages makes it easier to mark dates, readings, and notes in the shop.

Safety Note

Always follow the manual’s lockout and support procedures before inspecting or working under any raised component.

Komatsu 66D turbo Wheeled Loader Index:

TECHNICAL DATA
Machine identification
Dtnensions, weights, travel speeds
Engine
Transmission, axles, brakes
Steering system, loader hydraulics
Loader equipment
Buckets
Electrical system
Tyres and inflation pressures
INSTRUMENTS and CONTROLS
Layout
Converter oil temperature gauge, engine coolant temperature gauge
Powershift transmission oil pressure gauge, fuel gauge, fuel tank
Steering warning lamp, engine oil pressure warning lamp
Battery charging warning lamp, cab interior lamp
Starter switch. lighting switch
Turn-signal, head’amp dip switch
Cab heating and ventilating system
Fuse boxes and tail lamps
External electrical sockets
Driver’s seat, door check strap
OPERATION
Starting and stopping the engine
Cold start fuel injection pump
Operating technique
Road travel
Towing the rnaeh*le
Service brake
Servjce brake alarm
Transmission disconnect
Brake retarder
Parking brake
Tyre inflation coup”ng
Loader hydraulics

Link Belt