JET BGB-142 Operating Instructions and Parts Manual

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Operating Instructions and Parts Manual

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3-Wheel Belt Grinder

Models BGB-142/248/260-1/260-3

JET

Model BGB-248 shown

1.0 IMPORTANT SAFETY

INSTRUCTIONS

WARNING – To reduce risk of injury:

1. Read and understand the entire owner's manual before attempting assembly or operation.

2. Read and understand the warnings posted on the machine and in this manual. Failure to comply with all of these warnings may cause serious injury.

3. Replace the warning labels if they become obscured or removed.

4. This belt grinder is designed and intended for use by properly trained and experienced personnel only. If you are not familiar with the proper and safe operation of a belt grinder, do not use until proper training and knowledge have been obtained.

5. Do not use this machine for other than its intended use. If used for other purposes, JET disclaims any real or implied warranty and holds itself harmless from any injury that may result from that use.

6. Always wear ANSI Z87.1 approved safety glasses or face shield while using this machine. (Everyday eyeglasses only have impact resistant lenses; they are not safety glasses.)

7. Before operating this machine, remove tie, rings, watches and other jewelry, and roll sleeves up past the elbows. Do not wear loose clothing. Confine long hair. Non-slip footwear or anti-skid floor strips are recommended.

8. Wear leather safety gloves, arm guards, leather aprons and safety shoes when using a belt grinder.

9. Wear ear protectors (plugs or muffs) if noise exceeds safe levels.

10. CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm.

11. This product, when used for welding, cutting, or working with metal, produces fumes, gases, or dusts which contain chemicals known to the State of California to cause birth defects and, in some cases, cancer. (California Health and Safety Code Section 25249.5 et seq.)

12. A dust collection system is recommended. Operator shall also wear a dust mask at all times.

13. Additional precautions may be necessary for grinding materials which are flammable or have other hazardous properties. Always consult the manufacturer of such materials for instructions on grinding and handling.

14. Make certain the switch is in the OFF position before connecting the machine to the power supply.

15. Make certain the machine is properly grounded.

16. Make all machine adjustments or maintenance with the machine unplugged from the power source.

17. Remove adjusting keys and wrenches. Form a habit of checking to see that keys and adjusting wrenches are removed from the machine before turning it on.

18. Keep safety guards in place at all times when the machine is in use. If removed for maintenance purposes, use extreme caution and replace the guards immediately after completion of maintenance.

19. Check damaged parts. Before further use of the machine, a guard or other part that is damaged should be carefully checked to determine that it will operate properly and perform its intended function. Check for alignment of moving parts, binding of moving parts, breakage of parts, mounting and any other conditions that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced.

20. Provide for adequate space surrounding work area and non-glare, overhead lighting.

21. Keep the floor around the machine clean and free of scrap material, oil and grease.

22. Keep visitors a safe distance from the work area. Keep children away.

23. Make your workshop child proof with padlocks, master switches or by removing starter keys.

24. Give your work undivided attention. Looking around, carrying on a conversation and “horseplay” are careless acts that can result in serious injury.

25. Maintain a balanced stance at all times so that you do not fall into the belt or other moving parts. Do not overreach or use excessive force to perform any machine operation.

26. Use the right tool at the correct speed and feed rate. Do not force a tool or attachment to do a job for which it was not designed. The right tool will do the job better and more safely.

27. Use recommended accessories; improper accessories may be hazardous.

28. Maintain tools with care. Keep tools sharp and clean for the best and safest performance. Follow instructions for lubricating and changing accessories.

29. Turn off the machine before cleaning. Use a brush or compressed air to remove chips or debris — do not use your hands.

30. Do not stand on the machine. Serious injury could occur if the machine tips over.

31. Never leave the machine running unattended. Turn the power off and do not leave the machine until it comes to a complete stop.

32. Remove loose items and unnecessary work pieces from the area before starting the machine.

Familiarize yourself with the following safety notices used in this manual:

33. Don’t use in dangerous environment. Don’t use power tools in damp or wet location, or expose them to rain. Keep work area well lighted.

34. Use proper extension cord. Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy enough to carry the current your product will draw. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. Table 6-1 (sect. 6.3) shows the recommended size to use depending on cord length. If in doubt, use the next heavier gage. The smaller the gage number, the heavier the cord.

machine damage.

injury.

This means that if precautions are not heeded, it may result in minor injury and/or possible

This means that if precautions are not heeded, it may result in serious, or possibly even fatal,

2.0 Table of contents

Section Page

1.0 IMPORTANT SAFETY INSTRUCTIONS ....................................................................................................... 2

2.0 Table of contents ............................................................................................................................................ 4

3.0 About this manual .......................................................................................................................................... 5

4.0 Specifications for BGB-series Belt Grinders .................................................................................................. 6

4.1 Base mounting pattern ............................................................................................................................... 7

5.0 Setup and assembly ....................................................................................................................................... 8

5.1 Shipping contents ....................................................................................................................................... 8

5.2 Unpacking and installing ............................................................................................................................ 8

5.3 Dust collection ............................................................................................................................................ 8

6.0 Electrical connections .................................................................................................................................... 8

6.1 GROUNDING INSTRUCTIONS ................................................................................................................. 8

6.2 Voltage conversion ..................................................................................................................................... 9

6.3 Extension cords .......................................................................................................................................... 9

7.0 Adjustments ................................................................................................................................................. 10

7.1 Work rest adjustment ............................................................................................................................... 10

7.2 Platen adjustment ..................................................................................................................................... 10

7.3 Abrasive belt tension ................................................................................................................................ 10

7.4 Abrasive belt tracking ............................................................................................................................... 10

7.5 V-belt tension ........................................................................................................................................... 11

8.0 Operation ..................................................................................................................................................... 11

8.1 Operating controls .................................................................................................................................... 11

8.2 General operating tips .............................................................................................................................. 11

9.0 User-maintenance ........................................................................................................................................ 11

9.1 General cleaning ...................................................................................................................................... 11

9.2 Lubrication ................................................................................................................................................ 11

9.3 Abrasive belt replacement ........................................................................................................................ 11

9.4 Contact wheel replacement ...................................................................................................................... 11

9.5 V-belt replacement ................................................................................................................................... 12

9.6 Additional servicing .................................................................................................................................. 12

10.0 Optional accessories .................................................................................................................................. 12

11.0 Troubleshooting BGB-series Belt Grinders ................................................................................................ 12

12.0 Replacement Parts ..................................................................................................................................... 13

12.1.1 Motor and Base Assembly – Exploded View - Models BGB-142/248/260-1 ....................................... 13

12.1.2 Motor and Base Assembly – Parts List – Model BGB-142 .................................................................. 14

12.1.3 Motor and Base Assembly – Parts List – Model BGB-248 .................................................................. 15

12.1.4 Motor and Base Assembly – Parts List – Model BGB-260-1 ............................................................... 16

12.2.1 Motor and Base Assembly – Exploded View – Model BGB-260-3 ...................................................... 17

12.2.2 Motor and Base Assembly – Parts List – Model BGB-260-3 ............................................................... 18

12.3.1 Belt and Housing Assembly – Exploded View – Model BGB-142 ....................................................... 19

12.3.2 Belt and Housing Assembly – Parts List – Model BGB-142 ................................................................ 20

12.4.1 Belt and Housing Assmbly – Exploded View – Models BGB-248/260-1/260-3 ................................... 22

12.4.2 Belt and Housing Assembly – Parts List – Model BGB-248 ................................................................ 23

12.4.3 Belt and Housing Assembly – Parts List – Model BGB-260-1 ............................................................. 25

12.4.4 Belt and Housing Assembly – Parts List – Model BGB-260-3 ............................................................. 27

12.5.1 Adaptor Plate (OPTIONAL) – Exploded View – Model BGB-142/248 ................................................. 29

12.5.2 Adaptor Plate (OPTIONAL) – Parts List – Model BGB-142/248 ......................................................... 29

12.6.1 Adaptor Plate (OPTIONAL) – Exploded View – Model BGB-260-1/260-3 .......................................... 30

12.6.2 Adaptor Plate (OPTIONAL) – Parts List – Model BGB-260-1/260-3 ................................................... 30

13.0 Electrical Connections ................................................................................................................................ 31

13.1 Wiring diagram – 115V (Models BGB-141/248/260-1) .......................................................................... 31

13.2 Wiring diagram – 1PH, 230V (Models BGB-141/248/260-1) ................................................................. 32

13.3 Wiring diagram – 3PH, 230V (Model BGB-260-3) .................................................................................. 33

13.4 Wiring diagram – 3PH, 460V (Model BGB-260-3) .................................................................................. 34

14.0 Warranty and service ................................................................................................................................. 35

3.0 About this manual

This manual is provided by JET, covering the safe operation and maintenance procedures for a JET Model BGBseries Benchtop Belt Grinder. This manual contains instructions on installation, safety precautions, general operating procedures, maintenance instructions and parts breakdown. Your machine has been designed and constructed to provide consistent, long-term operation if used in accordance with the instructions as set forth in this document.

If there are questions or comments, please contact your local supplier or JET. JET c an also be reached at our web site: www.jettools.com.

Retain this manual for future reference. If the machine transfers ownership, the manual should accompany it.

Read and understand the entire contents of this manual before attempting assembly or

operation! Failure to comply may cause serious injury!

Register your product using the mail-in card provided, or register online – http://www.jettools.com/us/en/serviceand-support/warranty/registration/

4.0 Specifications for BGB-series Belt Grinders

Model number Stock number 577100 577125 577150 577153

Motor and Electricals

Motor type Totally enclosed fan cooled, induction Horsepower 3/4 1 1-1/2 3 Phase 1 3

Voltage Cycle 60 Hz

Listed FLA (full load amps) 11.5 / 5.8 12 / 6 14.6 / 7.3 8 / 4 Motor speed (RPM) 3450 Starting amps 36 48 52 42 Running amps (no load) 8 7.3 7 4 Start capacitor 200MFD 125VAC 400MFD 125VAC n/a Run capacitor

Power cord Power plug installed 125V, 15A n/a

On/off switch

Power transfer Poly V-belt Recommended circuit size 2 20 Amp

Sound emission without load 3

Abrasive and wheels

Abrasive provided Aluminum oxide, 120-grit Abrasive size Abrasive speed 5500 FPM

Number of wheels 3 Wheel size Ø4.75 x 1 in.

Wheel speed (RPM) 4500 4600 4400 4400

Dust collection

Dust port outside diameter 2 in. (50.8 mm) Recommended dust extraction 400 CFM (0.5 CMM)

Main materials

Housing Aluminum and steel Motor shroud Steel Platen Cast iron Table Cast iron Base Cast iron Contact wheel Aluminum, rubber coated (65 Duro) Driven wheels Aluminum, PU coated

Dimensions

Work rest (LxW) 2-1/4 x 4-1/2 in. (57 x 115 mm) Base (LxW) 13-1/2 x 15-3/64 in. (343 x382mm) 13-1/2 x 17 in. (343 x 432 mm)

BGB-142 BGB-248 BGB-260-1 BGB-260-3

n/a

SJT 14AWG x 3C, 6 ft. (1830 mm) ST 14AWGx4C

74 dB at 100cm,

77 dB at 50cm

1 x 42 in.

(25 x 1067mm)

(1676 MPM)

(120 x 25 mm)

115/230V (prewired 115V) 230/460V

(prewired 230V)

45μF 250VAC 70μF 250VAC

in terminal box

Toggle with safety key Momentary, to

control magnetic

switch

80 dB at 100cm,

84 dB at 50cm

2 x 48 in.

(50 x 1219 mm)

6000 FPM

(1829 MPM)

Ø5 x 2 in.

(127 x 50 mm)

78 dB at 100cm,

82 dB at 50cm

2 x 60 in.

(50 x 1524 mm)

8000 FPM

(2438 MPM)

Ø7 x 2 in. (178 x 50 mm)

Dimensions (cont.)

Overall dimensions (HxWxD) 20-5/16 x 15-5/8

Shipping dimensions (HxWxD) 24-13/16 x 22-7/16 x 24-13/32 in.

Weights

Net weight (approx.) 105 lb. (48 kg) 114 lb. (52 kg) 137 lb. (62 kg) 145 lb. (66 kg) Shipping weight (approx.) 124 lb. (56 kg) 132 lb. (60 kg) 161 lb. (72.8 kg) 168 lb. (76 kg)

BGB-142 BGB-248 BGB-260-1 BGB-260-3

x 20-17/3 in.

(516 x 397 x 521

mm)

(630 x 570 x 620 mm)

22-11/32 x 19 x

20-5/8 in.

(567 x 482 x 524

mm)

26-11/16 x 21 x 23-3/32 in.

(678 x 533 x 587 mm)

29-1/8 x 25-19/32 x 28-3/4 in.

(740 x 650 x 730 mm)

Table 4-1

Conversion to 460-volt requires purchase and installation of 460V magnetic contactor (not provi ded). See parts list.

Subject to local and national electrical codes.

The specified values are emission levels and are not necessarily to be seen as safe operating levels. As workplace conditions vary, this information is intended to allow the user to make a better estimation of the hazards and risks involved only.

L = length, W = width, H = height, D = depth n/a = not applicable The specifications in this manual were current at time of publication, but because of our policy of continuous

improvement, JET reserves the right to change specifications at any time and without prior notice, without incurring obligations.

4.1 Base mounting pattern

Figure 4-1

A B C BGB-142 BGB-248 BGB-260-1 BGB-260-3

Ø 7/16 in. (11m Ø 7/16 in. (11mm) Ø 7/16 in. (11mm) Ø 7/16 in. (11mm)

12-19/32 in. (320m 13-3/8 in. (340mm)

12-19/32 in. (320mm) 12-19/32 in. (320mm) 12-19/32 in. (320mm)

13-3/8 in. (340mm) 14-31/32 in. (380mm) 14-31/32 in. (380mm)

Table 4-2

Read and understand all

assembly instructions before attempting assembly and setup. Failure to comply may cause serious injury.

5.0 Setup and assembly

5.1 Shipping contents

1 Belt Grinder with mounted abrasive 1 Operating instructions and parts manual 1 Product registration card

5.2 Unpacking and installing

The Grinder does not require assembly, only mounting to a support, such as bench or table.

Inspect contents for shipping damage. Report damage, if any, to your distributor. Do not discard shipping materials until grinder is installed and running properly.

Lift grinder out of carton along with plywood platform. Remove platform and place grinder on a sturdy table or workbench. Secure to workbench with fasteners through the four holes in base. See sect. 4.1 for hole spacings.

An optional adaptor plate (not included) is available for mounting the grinder to the JET JDCS-505 Dust Collection Stand. See your dealer or visit our website for ordering information.

IMPORTANT: The abrasive belt has been detensioned for shipping. Belt must be properly tensioned before operating grinder. See sect. 7.3.

5.3 Dust collection

It is recommended that a dust collection system be used with this machine. Connect dust hose (not provided) to the 2-inch port at back of grinder and secure with clamp.

6.0 Electrical connections

Electrical connections must be

made by a qualified electrician in compliance with all relevant codes. This machine must be properly grounded to help prevent electrical shock and possible fatal injury.

Before connecting to power source, be sure switch is in off position.

It is recommended that the Belt Grinder be connected to a dedicated 20 amp circuit with circuit breaker or time-delay fuse marked “D”. Local codes take precedence over recommendations.

6.1 GROUNDING INSTRUCTIONS

1. All Grounded, Cord-connected Tools:

In the event of a malfunction or breakdown, grounding provides a path of least resistance for electric current to reduce the risk of electric shock. This tool is equipped with an electric cord having an equipment-grounding conductor and a grounding plug. The plug must be plugged into a matching outlet that is properly installed and grounded in accordance with all local codes and ordinances.

Do not modify the plug provided - if it will not fit the outlet, have the proper outlet installed by a qualified electrician.

Improper connection of the equipment-grounding conductor can result in a risk of electric shock. The conductor with insulation having an outer surface that is green with or without yellow stripes is the equipment-grounding conductor. If repair or replacement of the electric cord or plug is necessary, do not connect the equipment-grounding conductor to a live terminal.

Check with a qualified

electrician or service personnel if the grounding instructions are not completely understood, or if in doubt as to whether the tool is properly grounded. Failure to comply may cause ser ious or fatal injury.

Use only 3-wire extension cords that have 3-prong grounding plugs and 3-pole receptacles that accept the tool's plug.

Repair or replace damaged or worn cord immediately.

2. Grounded, cord-connected tools intended for use on a supply circuit having a nominal rating less than 150 volts:

This tool is intended for use on a circuit that has an outlet that looks like the one illustrated in A, Figure 6-1. An adapter, shown in B and C, may be used to connect this plug to a 2-pole receptacle as shown in B if a properly grounded outlet is not available. The temporary adapter should be used only until a properly grounded outlet can be installed by a qualified electrician. This adapter is not permitted in Canada. The green-colored rigid ear, lug, and the like, extending from the adapter must be connected to a permanent ground such as a properly grounded outlet box.

3. Grounded, cord-connected tools intended for use on a supply circuit having a nominal rating between 150 - 250 volts, inclusive:

This tool is intended for use on a circuit that has an outlet that looks like the one illustrated in D, Figure 6-1. The tool has a grounding plug that looks like the plug illustrated in D. Make sure the tool is connected to an outlet having the same configuration as the plug. No adapter is available or should be used with this tool.

If the tool must be reconnected for use on a different type of electric circuit, the reconnection should be made by qualified service personnel; and after reconnection, the tool should comply with all local codes and ordinances.

Figure 6-1

6.2 Voltage conversion

For models BGB-142, BGB-248, BGB-260-1:

1. Remove four screws from control panel, and

remove panel from motor shroud. Switch incoming motor leads according to wiring diagram.

2. Reinstall control panel on motor shroud.

3. Replace plug on end of motor cord with proper

UL/CSA listed plug rated for the new incoming voltage.

4. Test run the grinder. If abrasive belt moves

upward instead of downward, disconnect machine from power and switch any two of the three power leads (not the green ground wire).

For model BGB-260-3:

1. Remove four screws from motor shroud and

remove shroud.

2. Open motor junction box and switch incoming

power leads according to wiring diagram on inside cover of junction box. Diagrams are also placed at back of this manual. (In case of discrepancy, diagrams on machine take precedence.)

3. Replace magnetic starter with 460V starter; see parts list to order.

4. Re-install junction box cover and motor shroud.

5. Test run the grinder. If abrasive belt moves upward instead of downward, disconnect machine from power and switch any two of the three power leads (not the green ground wire).

6.3 Extension cords

The use of extension cords is discouraged; try to position equipment within reach of the power source. For circuits which are far away from the electrical service box, the wire size must be increased in order to deliver ample voltage to the motor. To minimize power losses and to prevent motor overheating and burnout, the use of wire sizes for branch circuits or electrical extension cords according to Table 1 is recommended. If in doubt, use the next heavier gauge. The smaller the gauge number, the heavier the cord.

Conductor length

0 – 50 ft. 14 14 50 – 100 ft. 14 12 Over 100 ft. 14 8

AWG # (American Wire Gauge)

240 Volt lines 120 Volt lines

Extension Cord Recommendations

Table 6-1

Figure 7-1: Belt Grinder identification

7.0 Adjustments

Disconnect machine from

power source before making adjustments.

Refer to Figure 7-1.

7.1 Work rest adjustment

Loosen work rest handle and adjust work rest to desired angle. Minimize gap between edge of work rest and abrasive belt; 1/16-inch or less.

Tighten work rest handle before operating. Note: Handles are adjustable; pull handle straight

out and rotate it on the pin, then release. Make sure handle reseats itself on the pin.

7.2 Platen adjustment

Loosen platen handle and adjust platen so it is parallel to back of abrasive belt and almost touching.

7.3 Abrasive belt tension

To de-tension abrasive belt, turn tension knob counterclockwise and pull knob to the right.

To tension, push knob to the left. The pawl will “click” as it engages each ratchet tooth. Do not overtension; tighten belt until it is just taut. A moderate tension will provide faster cutting and longer belt life, as well as better tracking.

NOTE: When belt grinder is not being used, detension the abrasive belt. This will prolong the li fe of the belt, and reduce load on wheels, bearings and other components.

7.4 Abrasive belt tracking

The abrasive belt should remain centered upon the wheels during operation. If it tends to slide offcenter, adjust as follows:

1. Disconnect machine from power source and pull open side cover.

2. Rotate tracking knob left or right as you turn tracking wheel with your other hand. Do this in small increments and allow time for belt to respond to changes. Clockwise knob rotation moves belt toward left, counterclockwise toward right.

3. If belt refuses to track properly, increase belt tension and repeat above steps.

7.5 V-belt tension

1. Disconnect machine from power source.

2. Remove four button head screws and open motor shroud.

3. Remove two screws from pulley cover (access through housing) and remove pulley cover.

4. Loosen screws on motor mount and slide motor backward to tension belt.

5. Tighten motor mount screws, reinstall pulley cover and shroud.

3. Handles must be tight and covers closed before operating.

4. Some metals may create a fire hazard during grinding; consult workpiece supplier for instructions on proper use and cautions.

5. Allow machine to come up to speed before applying workpiece.

6. Place workpiece upon work rest, and apply only moderate pressure into abrasive belt; do not apply excessive pressure.

9.0 User-maintenance

Always disconnect power to machine before performing maintenance. Failure to do this may result in serious personal injury.

9.1 General cleaning

8.0 Operation

8.1 Operating controls

Refer to Figure 7-1. Power indicator light – Illuminates when machine

is connected to power. Running indicator light – Illuminates when motor

is operating.

MODELS BGB-142/248/260-1 only:

On/off switch with safety key – Pull up to start motor, push down to stop.

IMPORTANT: To prevent accidental or unauthorized starting of grinder, shut off machine and pull out key (yellow portion) of switch and store in safe place. This key must be reinserted to start machine.

Overload reset – If motor overheats, allow machine a few minutes to cool down, then push button to reset.

MODELS BGB-260-3 only:

On button – Push to start motor. Emergency stop – Push to stop motor. To restart,

rotate button clockwise until it disengages. Overload reset – (Inside magnetic starter box.) If

motor overheats, allow machine a few minutes to cool down, then the overload relay will automatically reset.

8.2 General operating tips

1. Always use platen when grinding workpiece.

2. Adjust gap between work rest and belt to 1/16inch or less.

Keep exterior of machine clean and free of chips. Periodically clean out interior of housing with vacuum or brush – do not use bare hands. Periodically empty grinding dust and particles from the dust collection system (not provided).

9.2 Lubrication

Lubrication of the grinder is not required. Bearings are pre-lubricated and sealed.

9.3 Abrasive belt replacement

1. Disconnect machine from power source.

2. Open side cover, and open dust cover by unscrewing dust cover screw.

3. De-tension and slip belt off wheels.

4. Install new belt around wheels, tension, and test tracking. Make further adjustments as needed.

5. Close all covers before operating.

9.4 Contact wheel replacement

1. Disconnect machine from power source.

2. Open side cover and dust cover, and remove abrasive belt.

3. Loosen and remove hex nut and flange washer, and slide contact wheel off spindle.

4. Install new wheel. Reinstall flange washer and hex nut and tighten.

5. Install abrasive belt, tension, and check tracking.

6. Close all covers before operating.

9.5 V-belt replacement

10.0 Optional accessories

Disconnect machine from power source. Follow steps in sect. 7.4 to access pulleys and belt. Slide motor forward to loosen belt and slip belt off pulleys. Install new belt and slide motor back to tension it. Secure all covers and screws.

The following adaptor plates are available for mounting your grinder to the JDCS-505 JET Dust Collection Stand. Contact your dealer to order, or call JET at the phone number on the cover.

# 414832 – Adaptor Plate Kit (for BGB-142/248)

9.6 Additional servicing

Any additional servicing should be performed by authorized service personnel.

# 414833 – Adaptor Plate Kit (for BGB-260-1/260-3)

11.0 Troubleshooting BG B-series Belt Grinders

Symptom Possible Cause Correction*

Motor will not start Low voltage. Check power line for proper voltage.

Open circuit in motor or loose connection.

Motor will not start: fuses or circuit breakers blow

Machine slows when operating

Loud, repetitive noise coming from machine

Poor tracking Improper abrasive belt splice. Check belt for irregular seam or shape.

Slack abrasive belt Insufficient belt tension. Set tension so belt is just taut.

Short circuit in line cord or plug. Inspect cord or plug for damaged insulation

Short circuit in motor or loose connections.

Incorrect fuses or circuit breakers in power line.

Applying excessive pressure of workpiece against platen.

V-belt loose. Tighten V-belt. Pulley setscrews or keys are missin g or

loose. Motor fan is hitting the fan cover. Tighten fan or shim cover.

V-belt is defective. Replace V-belt.

Excessive belt tension. Set tension so belt is just taut. Insufficient belt tension. Set tension so belt is just taut. Worn contact surfaces. Check surface of contact wheels. Replace

Misaligned contact surfaces. Check alignment of tracking wheels and

Lack of crown on drive wheel. Check for 1/16-inch crown. Replace drive

Worn bearings. Check all bearings for overheating or

Inspect all lead connections on motor for loose or open connections.

and shorted wires. Inspect all connections on motor for loose or

shorted terminals or worn insulation. Install correct fuses or circuit breakers.

Reduce pressure against abrasive/platen.

Inspect keys and setscrews. Replace or tighten if necessary.

worn wheels.

contact wheel. Realign if needed.

wheel if crown is not present.

damage. Replace w orn or damaged bearings.

Contact wheel wear Excessive belt tension. Set tension so belt is just taut.

Grinding in one area on belt. Use entire work surface of belt whenev er

possible.

Excessive grinding depos its o n be lt and debris in machine.

Short abrasive belt life. Excessive grinding pressure. Allow belt to do the cutting. Excessive

Periodically clean interior of grinder.

pressure dulls belt and removes grit from it.

*Warning: Some corrections may require a qualified electrician.

Table 11-1

12.0 Replacement Parts

Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-800274-6848 Monday through Friday, 8:00 a.m. to 5:00 p.m. CST. Having the Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately.

Non-proprietary parts, such as fasteners, can be found at local hardware stores, or may be ordered from JET. Some parts are shown for reference only, and may not be available individually.

12.1.1 Motor and Base Assembly – Exploded View - Models BGB-142/248/260-1

12.1.2 Motor and Base Assembly – Parts List – Model BGB-142

Index No Part No Description Size Qty

1 ................ BGB248-101 ............. Switch Box ............................................................... ...................................... 1

2 ................ 6295815 .................... Phillips Round Hd Tapping Screw ........................... M3 x 10L ....................... 8

3 ................ BGB248-103 ............. Strain Relief ............................................................. ...................................... 1

4 ................ BGB248-104 ............. Cable Protection Pipe .............................................. ...................................... 1

5 ................ BGB248-105 ............. Strain Relief ............................................................. ...................................... 1

6 ................ F009887 .................... Socket Head Button Screw ...................................... M5 x 0.8P x 16L ........... 2

7 ................ JSG96-135 ................ Switch ...................................................................... ...................................... 1

.................. JSG96-135A .............. Switch Key (not shown) ........................................... ...................................... 1

8 ................ BGB248-108 ............. Control Panel (includes LM000254 label) ................ ...................................... 1

9 ................ BGB248-109 ............. Overload Protector................................................... ...................................... 1

10 .............. BGB248-110 ............. Running Indication Light .......................................... ...................................... 1

11 .............. BGB248-111 ............. Power Indication Light ............................................. ...................................... 1

12 .............. F000648 .................... Phillips Pan Hd Machine Screw ............................... #10-24UNC x 1/4"L ....... 2

13 .............. F002097 .................... Lock Washer, Ext. Tooth ......................................... M5 ................................. 2

14 .............. BGB248-114 ............. Copper Ground Plate ............................................... ...................................... 1

15 .............. BGB248-115 ............. Motor Shroud ........................................................... ...................................... 1

16 .............. BGB248-116 ............. Strain Relief ............................................................. ...................................... 1

17 .............. TS-2248122 .............. Socket Head Button Screw ...................................... M8 x 1.25 x 12L ............ 4

18 .............. TS-1550061 .............. Flat Washer ............................................................. 8.5 x 20 x 1.5T .............. 8

19 .............. JET-138 ..................... JET Logo ................................................................. 138 x 57mm .................. 1

20 .............. BGB142-120 ............. Motor ....................................................................... 3/4HP, 115/230V, 1PH . 1

.................. BGB248-120SC ........ Starting Capacitor (not shown) ................................ 200MFD 125VAC .......... 1

.................. BGB248-120SCC ...... Starting Capacitor Cover (not shown)...................... ...................................... 1

.................. BGB248-120CF ......... Cooling Fan (not shown) ......................................... ...................................... 1

.................. BGB248-120FC ......... Fan Cover (not shown) ............................................ ...................................... 1

21 .............. TS-2228161 .............. Hex Cap Screw ........................................................ M8 x 1.25P x 16L ......... 4

22 .............. TS-2361081 .............. Lock Washer ............................................................ M8 ................................. 4

23 .............. BGB142-123 ............. Base......................................................................... ...................................... 1

24 .............. 6296048 .................... Key, Double Rd Head .............................................. 5 x 5 x 25L mm ............. 1

25 .............. TS-1522021 .............. Socket Head Set Screw ........................................... M5-0.8 x 8L ................... 2

26 .............. BGB142-126 ............. Motor Pulley ............................................................. ...................................... 1

27 .............. BGB248-127 ............. Power Cable ............................................................ ...................................... 1

28 .............. BGB248-128 ............. Internal Cable .......................................................... 14AWG, 20cm, Black .... 2

29 .............. BGB248-129 ............. Internal Cable .......................................................... 14AWG, 20cm, White ... 2

30 .............. BGB248-130 ............. Internal Cable .......................................................... 14AWG, 50cm, Black .... 4

31 .............. BGB248-131 ............. Internal Cable .......................................................... 14AWG, 60cm, Green .. 1

32 .............. BGB248-132 ............. Internal Cable .......................................................... 14AWG, 10cm, Red ...... 2

33 .............. BGB248-133 ............. Internal Cable .......................................................... 14AWG, 10cm, White ... 1

34 .............. BGB248-134 ............. Internal Cable .......................................................... 18AWG, 15cm, White ... 1

35 .............. BGB248-135 ............. Internal Cable .......................................................... 14AWG, 12cm, Black .... 1

36 .............. BGB248-136 ............. Internal Cable .......................................................... 18AWG, 10cm, Red ...... 1

37 .............. BGB248-137 ............. Wire Nut ................................................................... ...... ................................ 5

12.1.3 Motor and Base Assembly – Parts List – Model BGB-248