SECTION 7: SERVICE

About Service

This section is provided for your convenience—it is not a substitute for the Grizzly Service Department. If you need help troubleshooting, you need replacement parts, or you are unsure of how to perform the pro- cedures in this section, then feel free to call our Technical Support at (570) 546-9663.

Troubleshooting

Motor & Electrical

Symptom

Possible Cause

Possible Solution

 

 

 

Machine does not start or a breaker trips.

1. Plug or receptacle is at fault or wired

1. Test power plug and receptacle for

 

incorrectly.

good contact and correct wiring.

 

2. Start capacitor is faulty.

2. Replace capacitor.

 

3. Motor connection is wired incorrectly.

3. Correct motor wiring (see Page 41).

 

4. Power supply is faulty, or is switched

4. Make sure all hot lines and grounds are

 

OFF.

operational and have correct voltage

 

 

on all legs.

 

5. Safety switch key is at fault.

5. Install or replace safety key, or replace

 

 

switch assembly.

 

6. ON/OFF switch is faulty.

6. Replace faulty switch.

 

7. Cable or wiring is open or has high

7. Troubleshoot wires for internal or exter-

 

resistance.

nal breaks, check for disconnected or

 

 

corroded connections and repair or

 

 

replace wiring.

 

8. Motor is at fault.

8. Test, repair or replace motor.

 

 

 

Machine stalls or is underpowered.

1. Incorrect spindle speed for task.

1. Decrease spindle speed.

 

2. Machine is undersized for the task.

2. Use smaller drill bits/cutters and reduce

 

 

the feed rate and spindle speed.

 

3. Bit or cutter is dull.

3. Sharpen/replace bit or cutter.

 

4. Low power supply voltage.

4. Make sure hot lines and grounds are

 

 

operational w/correct voltage.

 

5. Belt(s) is slipping.

5. Replace bad belts, align pulleys, and

 

 

re-tension.

 

6. Plug or receptacle is at fault.

6. Test power plug and receptacle for

 

 

good contact and correct wiring.

 

7. Motor connection is wired incorrectly.

7. Correct motor wiring (see Page 41).

 

8. Pulley is slipping on shaft.

8. Replace loose pulley and shaft.

 

9. Motor bearings are at fault.

9. Rotate motor shaft for noisy or burnt

 

 

bearings, repair/replace as required.

 

10. Motor has overheated.

10. Clean inside/outside of motor, let cool,

 

 

and reduce workload on machine.

 

11. Motor is at fault.

11. Test, repair or replace motor.

 

 

 

G7947/G7948 12 Speed Floor Drill Press

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Grizzly G7947, G7948 instruction manual About Service, Troubleshooting, Motor & Electrical
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G7947, G7948 specifications

The Grizzly G7948 and G7947 are powerful, professional-grade milling machines designed for precision metalworking. These models cater to the needs of machinists and hobbyists alike, combining innovation with robust features ideal for various milling tasks.

The Grizzly G7948 is a vertical mill with a large working table, allowing users to handle bigger workpieces efficiently. It features a 2 HP motor, providing a spindle speed range from 50 to 3,000 RPM, enabling operators to tackle a wide range of materials and applications. The G7948’s dovetail column ensures stability and rigidity, minimizing vibrations during operation, which is crucial for achieving precision in milling tasks.

On the other hand, the Grizzly G7947 is a versatile combination of a lathe and a mill, perfect for those looking to maximize functionality in a smaller workspace. It also boasts a robust 1 HP motor, allowing for smooth operation with adjustable spindle speeds, enhancing its versatility. The G7947 is particularly user-friendly, featuring a quick-change tool post that facilitates faster tool swapping and changeovers, which is a significant advantage when working on multiple projects.

Both models come equipped with advanced features such as a digital readout (DRO) system that aids in precision measurements. The DRO provides real-time feedback on the machine's positioning, helping eliminate guesswork and ensuring accuracy. Additionally, the machines' power feed for the table enhances efficiency, making it easier for users to execute repetitive tasks without the strain of manual cranking.

Another notable characteristic of the Grizzly G7948 and G7947 is their user-friendly controls, designed with ergonomics in mind. The intuitive layout ensures that operators can easily navigate through the machine’s settings, allowing for quicker setup times and smoother workflow.

Lastly, the sturdy construction of both milling machines means they are built to withstand rigorous use, making them reliable choices for both industrial applications and serious hobbyists. These models exemplify Grizzly's commitment to quality and performance, making them exceptional additions to any workshop.
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