U.S.SAWS CORE PRO-4 Hand-Held Core Drill

Introduction

This owner's manual provides essential safety information and operational guidance for the U.S.SAWS CORE PRO-4 Hand-Held Core Drill. It is designed to instruct users on safe practices for normal operation and maintenance. All provided manuals should be kept in a safe place.

The information and specifications in this publication were current at the time of printing. U.S.SAWS reserves the right to change specifications or design without prior notice.

The CORE PRO-4 is a high-performance, hand-held core drill engineered for fast, accurate, and efficient drilling of clean, precise holes in concrete and various other materials. Designed for professional contractors, it offers powerful performance and user-friendly features. It can drill hole sizes ranging from 1" to 4" in diameter, making it a versatile tool for diverse job site requirements.

Disclosure: By purchasing and using this product, users agree to release U.S.SAWS from all liability for incidental or consequential damages. It is the owner/user's responsibility to ensure the operator understands and follows all operating and maintenance instructions.

Specifications

Safety Warning: This tool generates significant force. ⚠️ Beware of crushing your fingers or other body parts.

[Diagram Description: Illustration showing a hand being crushed between two surfaces, and fingers being caught in moving machinery parts, emphasizing the danger of high force.]

Symbols & Decals

For Safe Operation

Users must be qualified and clearly understand all written instructions and safety rules for the job site. It is recommended to explain safety signs and practices to others.

Be Safe: Human error, including carelessness, fatigue, or distraction, can lead to serious injury or death. Always act safely and encourage others to do so.

• ? Read and understand the operator's manual before using the machine. Failure to follow instructions can result in injury or equipment damage.
• ? Always wear protective glasses or full face protection.
• ⛑️ Wear Head Protection, breathing protection, and hearing protection.
• ? Wear safety boots when operating this machine.

Dangers, Warnings, and Cautions

Safety symbols and explanations are designed to highlight hazards. They are not substitutes for proper accident prevention measures.

• ⚠️ DANGER: Indicates an imminently hazardous situation that, if not avoided, will result in death or serious injury.
• ⚠️ WARNING: Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury.
• ⚠️ CAUTION: Indicates a potentially hazardous situation that, if not avoided, may result in minor or moderate injury, or property damage.

• ? Wear appropriate clothing.
• ? Wear hand protection.
• ⚡ Wear proper electrostatic grounding equipment at all times.

Safety Instructions

Important Safety Instructions – Please Read Carefully Before Use

To avoid electric shock, fire, or serious injury while operating this electric tool, follow these guidelines closely. Keep this manual for future reference.

1. Maintain a Clean Work Area: Tidy environments reduce accident risks.
2. Prepare the Environment: Ensure the area is clean and dry. Do not use electric tools in rain or near flammable materials.
3. Avoid Electric Shock: Do not touch grounded surfaces with bare hands while operating the tool.
4. Keep Children and Untrained Individuals Away: Do not allow unauthorized persons near the tool during use.
5. Store Tools Safely: Store tools in a dry place away from children when not in use.
6. Avoid Overloading the Tool: Operate within its designed load capacity for optimal performance.
7. Wear Proper Protective Gear: Avoid loose clothing. Use ear protection, gloves, slip-resistant shoes, and secure long hair.
8. Use Proper Dust Collection: Connect to a dust extraction system for a cleaner, safer environment.
9. Handle the Power Cord with Care: Do not use the cord to carry the tool or unplug it. Keep it away from heat, oil, and sharp edges.
10. Maintain Proper Posture: Avoid overreaching; stand firmly and maintain balance.
11. Keep Your Tool in Good Condition: Regularly inspect the tool, cord, and plug. Replace damaged parts immediately. Keep handles clean and dry.
12. Unplug When Not in Use: Disconnect power before servicing or changing accessories.
13. Remove Wrenches Before Use: Ensure all adjustment tools are removed before starting.
14. Avoid Accidental Starts: Keep fingers off the switch when carrying the tool. Ensure the power switch is OFF before plugging in.
15. Use Appropriate Extension Cords: For outdoor use, use only rated and marked extension cords.
16. Operate Only in Good Condition: Do not use if tired, under the influence of alcohol, or medication affecting alertness.
17. Use Compatible Accessories: Select correct bits/accessories and run at appropriate speeds. Stop immediately if the tool vibrates excessively.
18. Use Genuine Accessories Only: Use original manufacturer parts for safety and performance.

Preparatory Stage

Follow these steps before beginning work for safe and proper operation:

Important: Always ensure the main power switch is OFF before connecting components.

Step 1: Unpacking & Inspection

Unpack the machine and components. Verify all parts are included per the packing list. Inspect for any transport damage. Confirm site voltage matches the machine's nameplate.

Step 2: Power Connection

Connect the machine to a properly grounded power source compliant with EN61029 and IEC1029-2-6 standards. A residual current device (RCD) with a 30mA leakage current rating is included for protection against electric shock and under-voltage. Ensure the RCD switch is ON before operating. If voltage drops, the RCD will shut off power; press RESET to reactivate once voltage is restored.

Note: Do not operate if the RCD is not functioning correctly. Never submerge the RCD in water. Regularly test the RCD.

Step 3: Water Supply Connection

Connect the water supply using the provided flexible tube and quick-connect fitting. Use only clean water, as impurities can damage sealing components. Do not exceed a maximum water pressure of 3 BAR.

Step 4: Safety Test

Turn on the machine using the soft-start switch to confirm smooth startup. Press the TEST button on the RCD to ensure it stops power flow, then press RESET to restore power.

REMINDER: Operators must never use the machine without a properly functioning RCD.

Safety Warning: This tool generates significant force. ⚠️ Beware of crushing your fingers or other body parts.

[Diagram Description: Illustration showing a hand being crushed between two surfaces, and fingers being caught in moving machinery parts, emphasizing the danger of high force.]

Dust Warning

Cutting, especially dry cutting, generates dust containing silica, a component of sand, quartz, brick clay, and granite. Excessive exposure can cause:

• Respiratory diseases (e.g., chronic bronchitis, silicosis, pulmonary fibrosis), which can be fatal.
• Skin irritation and rash.
• Cancer (according to NTP and IARC).

Precautionary Steps:

• Avoid inhaling dust, mist, and fumes; avoid skin contact.
• Use wet cutting when feasible to minimize dust.
• Wear appropriate respiratory protection (dust masks filtering microscopic particles) and ensure bystanders do the same (See OSHA 29 CFR Part 1910.1200).

California Prop 65 Warning: Use of this product may expose users to materials known to cause cancer and/or birth defects or other reproductive harm in California.

[Diagram Description: A warning triangle with an exclamation mark, followed by an icon of a person reading a manual, and a warning symbol indicating potential danger.]

Operation

Begin Operation

1. Select a Suitable Diamond Bit

The machines are compatible with four common spindle types. Always use a high-quality diamond bit. Ensure the bit has adequate clearance; the cutting head must be thicker than the wall of the metal tube for smooth drilling. Apply waterproof lubricant or oil-based paint to the bit for easier removal. Check for bit runout (wobble), which should not exceed 1 mm.

2. Secure the Drill Frame

Use one of the following methods to secure the frame firmly to the work surface:

• Expansion Bolts (Recommended): Use bolts at least 12 mm in diameter for maximum stability.
• Vacuum Suction: Ensure the vacuum pump is working properly and the sealing ring is intact.
• Support Stand: If using a frame support, verify its stability and security before drilling.

Securing the Machine with Expansion Bolts

Follow these steps for securing the machine with expansion bolts:

1. Ensure the drilling surface and machine base are level. Use leveling screws if the surface is uneven.
2. Firmly secure the machine using expansion bolts, positioning them close to the support column for maximum stability.
3. Verify the machine does not slide or move. Apply pressure around the column to check for side-to-side movement. A stable pillar is crucial for safe and precise drilling.

Important: U.S.SAWS recommends expansion bolts for securing the machine. Improper installation can lead to unsafe operation. U.S.SAWS is not liable for damage due to insecure mounting.

When drilling vertically upward, use a water collection basin to prevent water from entering the motor. Never allow water to contact the generator.

Friction Clutch

The built-in friction clutch protects the operator, machine, and bit from damage during sudden or high-force overloads. If the clutch engages, allow it to slip for no more than 3-4 seconds. Prolonged slipping can cause excessive heat and wear to the friction plate.

Master Switch and Overload Protection

The machine features a soft-start switch for smooth startup. Electronic overload protection will activate during overload, indicated by power fluctuations or interruptions. If the load is not reduced, the machine will shut off automatically. To restart, reduce the load and ensure the bit spins freely.

Voltage Warning: If using a generator, ensure the voltage does not exceed 260V. Higher voltage can cause serious damage or motor burnout.

Gear Speed Adjustment

Various ranges are available to suit bit size and workpiece hardness. Select the slowest speed for large diameter bits and hard materials. If the bit repeatedly stalls, change to a lower gear. If the bit stalls in the lowest gear, the machine is being used beyond its maximum capacity.

[Diagram Description: Graphic showing three gear shift levers labeled L, M, H, representing low, medium, and high speed settings.]

Common Faults and Methods of Removal

Maintenance and Repair

ATTENTION: Disconnect the main plug from the power socket before performing any maintenance or repair.

Clean the machine with a dry or moist rag; avoid using a water jet. Ensure no water enters the motor or switch box. Keep ventilation slots clean. Clean and grease the tool thread regularly.

Oil Bath Gear

The gear oil should be changed after the first 300 hours of operation. This work should be done in a specialist workshop or by following these steps: Clamp the machine vertically in a vice. Remove three hexagon socket screws. Take off the motor and intermediate cover. Change gear oil using only original oil. The filling quantity is 300-310ml. Reassemble in reverse order, ensuring the shim ring is on the front shaft.

ATTENTION: If gear oil escapes, stop the machine immediately, as oil leakage damages the gear.

Water Connection

If water escapes from the overflow hole on the water connection ring, the rotary shaft seals must be replaced immediately. This should only be done in an authorized specialist workshop.

Carbon Brushes

Carbon brushes should be examined for wear after approximately 300 hours of operation and replaced if necessary. This work, like other motor-related tasks, should only be performed by an electrician.

Parts

The following table lists the components of the U.S.SAWS CORE PRO-4 Hand-Held Core Drill.

[Diagram Description: An exploded view diagram illustrating the assembly of the core drill components, with numbered parts corresponding to the list above.]

Warranty

This document guides U.S.SAWS warranty policies and procedures. It assists in determining warranty justification and completing a warranty claim form.

Warranty Responsibility

The distributor or end user must prepare a Machine Warranty Information Card upon delivery. Failure to comply voids all warranties. Credit for repairs is issued after receipt of a properly completed WARRANTY CLAIM FORM.

Warranty Policy

U.S.SAWS warrants its products against defects in material and workmanship under normal use for one year (365 days) from the date of delivery (or assignment for Rental Fleet Machines). This warranty extends only to the original purchaser from U.S.SAWS or an authorized distributor. It excludes expendable parts like plugs, cutters, blades, wear parts, liners, and seals.

The warranty obligation is limited to replacement or repair at U.S.SAWS's discretion. It does not cover transportation costs, loss of operating time, or normal maintenance services.

This warranty does not cover failures due to abuse, misuse, negligence, corrosion, erosion, normal wear and tear, or unauthorized alterations. Warranty requests must be submitted in writing within thirty (30) days after failure.

Written authorization from U.S.SAWS is required to return merchandise under warranty. U.S.SAWS reserves the right to inspect and make the final decision on any returned merchandise.

U.S.SAWS offers no warranty on accessories not manufactured by U.S.SAWS, including engines, motors, batteries, and electrical boards. U.S.SAWS may make product changes or improvements without prior notice.

Warranty conditions can only be altered in writing by U.S.SAWS. Specific warranty terms for used or demo machines may be established on an individual basis.

U.S.SAWS does not authorize any person or organization to make other warranties or assume liability beyond what is contained herein.

U.S.SAWS shall not be liable for any direct, incidental, or consequential damages, including loss of goodwill or work stoppage, arising from the use of the product or breach of warranty.

U.S.SAWS makes no other warranties, expressed or implied, including implied warranties of MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE.