Yato YT-38781 Socket Set 1/4 and 1/2 Inch, 77 Pieces - Instruction Manual

Introduction

This instruction manual provides essential information for the safe and effective use of your Yato YT-38781 professional 77-piece socket and tool set. This comprehensive kit is designed for specialized automotive and mechanical services, as well as general household and workshop tasks. Please read this manual thoroughly before operating the tools to ensure proper handling, maintenance, and to maximize the lifespan of your set.

Safety Information

• Wear Eye Protection: Always wear safety glasses or goggles to protect your eyes from flying debris.
• Use Correct Tool for the Job: Select the appropriate size and type of tool for the fastener to prevent damage to the tool or workpiece.
• Inspect Tools Before Use: Check for any signs of wear, damage, or cracks. Do not use damaged tools.
• Keep Tools Clean and Dry: Prevent rust and maintain grip by keeping tools free from grease, oil, and moisture.
• Do Not Over-tighten: Avoid excessive force that could strip threads or break fasteners.
• Keep Children Away: Store tools out of reach of children.
• Avoid Modifying Tools: Do not alter or modify tools, as this can compromise their strength and safety.

Package Contents

Your Yato YT-38781 socket set includes the following 77 pieces:

• 1/4" Drive Sockets (25mm):
  • Sizes: 4, 5, 6, 7, 8, 9, 10, 11, 12 mm
• 1/2" Drive Sockets (38mm):
  • Sizes: 10, 11, 12, 13, 14, 15, 17, 19, 22, 24 mm
• 1/2" Drive Sockets (42mm):
  • Sizes: 27, 30, 32 mm
• Spark Plug Sockets:
  • Sizes: 16, 21 mm
• 1/4" Extensions:
  • Lengths: 76, 102 mm
• 1/2" Extensions:
  • Lengths: 127, 254 mm
• 72T Ratchets:
  • 1/4" Drive
  • 1/2" Drive
• Cardan Joints:
  • 1/4" Drive
  • 1/2" Drive
• 1/4" Square Adapter to Hexagonal
• 1/4" Bits:
  • Phillips: PH0, PH1, PH2, PH3
  • Pozidriv: PZ1, PZ2, PZ3
  • Flat: 3, 4, 5.5, 7 mm
  • Allen (Hex): 2, 3, 4, 5, 6 mm
  • Torx: T10, T15, T20, T25
• Hexagonal Adapter: 1/4" on 1/4" square
• Combination Wrenches:
  • Sizes: 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 19 mm
• Double Socket Wrenches:
  • Sizes: 8x9, 10x11, 12x13, 14x15 mm
• Hexagon Socket Wrenches (Allen Keys):
  • Sizes: 1.5, 2, 2.5, 5, 6, 8, 10 mm

Image: The Yato YT-38781 socket set displayed open in its durable carrying case, showing the organized arrangement of all 77 tools, including various sockets, ratchets, wrenches, and bits.

Setup

1. Unpack the Set: Carefully remove the socket set from its packaging.
2. Open the Case: Unlatch the clasps on the carrying case and open it to reveal the tools. The tools are securely held in molded compartments.
3. Familiarize Yourself: Take a moment to identify the different types of tools and their respective sizes within the case. This will help in quickly selecting the correct tool for your task.

Image: The Yato YT-38781 socket set in its closed, black, durable plastic carrying case, featuring the Yato logo and model number on the front.

Operating Instructions

Using Sockets and Ratchets

1. Select the Correct Socket: Choose a socket that precisely fits the fastener head. Using an incorrect size can damage the fastener or the socket.
2. Attach to Ratchet: Press the socket firmly onto the square drive of the ratchet. Ensure it clicks into place securely.
3. Select Ratchet Direction: Use the lever on the ratchet head to select the desired direction (tighten or loosen).
4. Apply Force: Place the socket squarely onto the fastener. Apply steady, controlled force to turn the ratchet. For stubborn fasteners, use extensions or a breaker bar (not included) if necessary, but avoid excessive force.
5. Using Extensions and Universal Joints: Extensions provide reach in confined spaces. Universal joints (cardan joints) allow for angled access to fasteners.

Using Combination Wrenches

Combination wrenches feature an open-end wrench on one side and a box-end wrench on the other, both of the same size. The box-end provides a more secure grip and is less likely to slip.

• Open-End: Useful for quick turns or when access is limited from the top.
• Box-End: Provides full contact with the fastener, reducing the risk of rounding corners. Ideal for breaking loose or final tightening.

Using Bits and Adapters

The set includes various bits (Phillips, Pozidriv, Flat, Allen, Torx) and adapters. These can be used with the 1/4" ratchet or a bit driver (not included) for fasteners requiring specific drive types.

Image: A detailed view of the Yato YT-38781 socket set, highlighting the various sockets, ratchets, and extension bars neatly arranged in their compartments.

Maintenance

• Cleaning: After each use, wipe down tools with a clean, dry cloth to remove dirt, grease, and moisture. For stubborn grime, use a mild degreaser and then dry thoroughly.
• Lubrication: Periodically apply a light coat of machine oil to the moving parts of ratchets and universal joints to ensure smooth operation and prevent rust.
• Storage: Always return tools to their designated spots in the carrying case. Store the case in a dry environment to prevent corrosion.
• Inspection: Regularly inspect all tools for signs of wear, damage, or deformation. Replace any damaged tools immediately to ensure safety and performance.

Troubleshooting

Specifications

• Model: YT-38781
• Brand: Yato
• Number of Pieces: 77
• Drive Sizes: 1/4", 1/2"
• Material: Chrome Vanadium Steel (CrV 50BV3)
• Socket System: AS-Drive (increases torque by 25%, protects nut rims)
• Ratchet Type: 72-tooth mechanism
• Product Dimensions: 50 x 50 x 28 cm (approximate case dimensions)
• Item Weight: 6.18 kg

Warranty and Support

For information regarding warranty coverage, technical support, or replacement parts, please refer to the official Yato website or contact your authorized Yato dealer. Keep your purchase receipt as proof of purchase.