Jet Tools J-4301A, J-4200A-2, J-4401A, J-4200A, J-4300A User Manual

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Operating Instructions and Parts Manual

Disc, Belt and Combination Disc/Belt Sanders

Models: J-4200A J-4300A J-4400A J-4200A-2 J-4301A J-4401A J-4202A

J-4200A Disc/Belt Sander J-4300A Belt Sander J-4400A Disc Sander

WALTER M EIE R (Manufac turing) Inc.

1.0 Warranty and Service

Walter Meier (Manufacturing) Inc., warrants every product it sells. If one of our tools needs service or repair, one of our Authorized Service Centers located throughout the United States can give you quick service. In most cases, any of these Walter Meier Authorized Service Centers can authorize warranty repair, assist you in obtaining parts, or perform routine maintenance and major repair on your JET® tools. For the name of an Authorized Service Center in your area call 1-800-274-6848.

MORE INFORMATION

Walter Meier is consistently adding new products to the line. For complete, up-to-date product information, check with your local Walter Meier distributor, or visit jettools.com.

WARRANTY

JET products carry a limited warranty which varies in duration based upon the product (MW = Metalworking, WW = Woodworking).

WHAT IS COVERED?

This warranty covers any defects in workmanship or materials subject to the exceptions stated below. Cutting tools, abrasives and other consumables are excluded from warranty coverage.

WHO IS COVERED?

This warranty covers only the initial purchaser of the product.

WHAT IS THE PERIOD OF COVERAGE?

The general JET warranty lasts for the time period specified in the product literature of each product.

WHAT IS NOT COVERED?

Five Year Warranties do not cover woodworking (WW) products used for commercial, industrial or educational purposes. Woodworking products with Five Year Warranties that are used for commercial, industrial or education purposes revert to a One Year Warranty. This warranty does not cover defects due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear, improper repair or alterations, or lack of maintenance.

HOW TO GET SERVICE

The product or part must be returned for examination, postage prepaid, to a location designated by us. For the name of the location nearest you, please call 1-800-274-6848. You must provide proof of initial purchase date and an explanation of the complaint must accompany the merchandise. If our inspection discloses a defect, we will repair or replace the product, or refund the purchase price, at our option. We will return the repaired product or replacement at our expense unless it is determined by us that there is no defect, or that the defect resulted from causes not within the scope of our warranty in which case we will, at your direction, dispose of or return the product. In the event you choose to have the product returned, you will be responsible for the shipping and handling costs of the return.

HOW STATE LAW APPLIES

This warranty gives you specific legal rights; you may also have other rights which vary from state to state.

LIMITATIONS ON THIS WARRANTY

WALTER MEIER (MANUFACTURING) INC., LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT. EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG THE IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU. WALTER MEIER SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY, OR FOR INCIDENTAL, CONTINGENT, SPECI AL, OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF OUR PRODUCTS. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU. Walter Meier sells through distributors only. The specifications in Walter Meier catalogs are given as general information and are not binding. Members of Walter Meier reserve the right to effect at any time, without prior notice, those alterations to parts, fittings, and accessory equipment which they may deem necessary for any reason whatsoever. JET® branded produc ts are not sold in Canada by Walter Meier.

2.0 Table of contents

Section Page

1.0 Warranty and Service ..................................................................................................................................... 2

2.0 Table of contents ............................................................................................................................................ 3

3.0 Safety Warnings ............................................................................................................................................. 4

4.0 Machine and Manual Overview ...................................................................................................................... 6

5.0 Specifications ................................................................................................................................................. 7

6.0 Operating instructions .................................................................................................................................... 8

6.1 Belt sander .................................................................................................................................... 8

6.2 Adjusting t he belt sander table....................................................................................................... 8

6.3 Using the indexing lock handle ...................................................................................................... 8

6.4 Adjusting t he belt sander arm ........................................................................................................ 8

6.5 Adjusting disc sander table ............................................................................................................ 9

6.6 Use of the Miter Gauge ................................................................................................................. 9

7.0 Maintenance ................................................................................................................................................. 10

7.1 Belt replacement ......................................................................................................................... 10

7.2 Track mechanism maint enanc e ................................................................................................... 10

7.3 Installing abr asive discs ............................................................................................................... 1 1

7.4 Replacing the v-belt ..................................................................................................................... 11

8.0 Machine setup .............................................................................................................................................. 13

8.1 Basic setup ................................................................................................................................. 13

8.2 Disc table angle adjustment ......................................................................................................... 13

8.3 Disc table miter parallelism adjustment ........................................................................................ 13 

8.4 Disc table gap adjustment ........................................................................................................... 1 4

8.5 Belt table miter slot parallelism adjustment .................................................................................. 14

8.6 Belt table angle adjustment ......................................................................................................... 14 

8.7 Adjusting or replacing the platen .................................................................................................. 15

9.0 Electrical connections .................................................................................................................................. 15

9.1 Single phase electr ic al hook up .................................................................................................... 16 

9.2 Three phase electrical hookup ..................................................................................................... 16

10.0 Troubleshooting ......................................................................................................................................... 17

11.0 Replacement parts ..................................................................................................................................... 18

11.1.1 Model J-4200A B elt and Disc Sander Assembly – Exploded View ........................................... 18

11.1.2 Model J-4200A B elt and Disc Sander Assembly – Parts List ................................................... 1 9

11.2.1 Model J-4300A B elt Sander A ssembly – Exploded View ......................................................... 21

11.2.2 Model J-4300A B elt Sander A ssembly – Parts List .................................................................. 22

11.3.1 Model J-4400A Disc Sander A ssembly – Exploded View ........................................................ 24

11.3.2 Model J-4400A Disc Sander A ssembly – Parts List ................................................................. 25

11.4.1 Base Assembly : All 1 P hase Models – Exploded View ............................................................ 26 

11.4.2 Base Assembly : All 1 P hase Models – Parts List..................................................................... 27

11.5.1 Base Assembly : All 3 P hase Models – Exploded View ............................................................ 28 

11.5.2 Base Assembly : All 3 P hase Models – Parts List..................................................................... 29

12.1 Electrical schematic – single phase ........................................................................................................... 30

12.2 Electrical schematic – 3 phase ................................................................................................................... 31

GeneralMachineryWarnings

3.0 Safety Warnings

GeneralCautions

- Misuse of this machine can cause serious injury.

- For safety, the machine must be set up, used and serviced pr oper l y.

- Read, understand and follow the instructions in the operator’s and parts manual which was shipped with your machine.

When setting up the machine:

- Always avoid using the machine in damp or poorly lighted work areas.

- Always be sure the machine is securely anchored to the floor.

- Al ways keep the machine guards in place.

- Always put the start switch in the “OFF” position before plugging in the machine.

When using the machine:

- Never operate the machine with safety guards missing.

- Always wear safety glasses with side shields (See ANSI Z87.1)

- Never wear loose clothing or jewelry.

- Never overreach; you may slip and fall into the machine.

- Never leave the machine running while unattended.

- Alwa ys sh ut th e m achi ne off w hen not in u se.

When servicing the machine:

- Always unplug the machine from the electrical power before servicing.

- Always follow the instructions in the operators and parts manual when changing accessory tools or parts.

- Never modify the machine without consulting Walter Meier (Manufacturing) Inc.

You — the stationary power tool user — hold the key to safe ty.

Read and follow these simple rules for best results and full benefits from your machine. Used properly, JET machinery is among the best in design and safety. However, any machine used improperly can be rendered inefficient and unsafe. It is mandatory that those who use our products be properly trained in how to use them correctly. They should read and understand the Operator’s and Parts Manual as well as all labels affixed to the machine. Failure in following all of these warnings can cause serious injuries.

1. Always wear protective eye wear when operating machinery. Eye wear shall be impact resistant, protective safety glasses with side shields which comply with ANSI Z87.1 specifications. Use of eye w ear which does not comply with ANSI Z87.1 specifications could result in severe injury from the breakage of the eye protection.

2. Wear proper apparel. No loose clothing or jewelry which can get caught in moving parts. Rubber soled, nonslip, footwear is recommended for best footing.

3. Do not overreach. Failure to maintain a proper working position can cause you to fall into the machine or cause your clothing to get caught — pulling you into the machine.

4. Keep the guards in place and in proper working order. Do not operate the machine with the guards removed.

5. Avoid dangerous working environments. Do not use stationary machine tools in wet or damp locations. Keep work areas clean and well lit.

6. Special electrical precautions should be taken when wor king on flamma ble materials .

7. Avoid accidental starts by being sure that the start switch is in the “OFF” position before plugging in the machine.

8. Never leave the machine running while unattended. The machine shall be shut off whenever it i s not bein g used.

9. Di sco nnect t he elect rica l power befor e serv icing , whenever changing accessories or when general maintenance is done on the machine.

10. Maintain all machine tools with care. Follow all maintenance instructions for lubricating and the changing of accessories. No attempt shall be made to modify or have makeshift repairs done to the machine. This not only voids the warranty but also renders the machine unsafe .

11. If there is any risk of tipping or sliding, the machinery must be anchored to the floor.

12. Secure your work. Use clamps or a vise to hold your work, when practical. It is safer than using your hands and it frees both hands to operate the machine.

13. Never brush chips away while the machine is in operation.

14. Keep work area clean. Cluttered areas invite accidents.

15. Remove adjusting keys and wrenches before turning the machine on.

16. Use the right tool. Don’t force a tool or attachment to do a job it was not designed for.

17. Use only recommended accessories and follow manufacturer’s instructions pertaining to them.

18. Keep hands in sight and clear of all moving parts and cutting surfaces.

19. Al l visitors should be kept at a safe distance from the work area. Make your workshop completely safe by using padlocks, master switches, or by removing starter keys.

20. Know the tool you are using; its application, limitations, and potential hazards.

GeneralElectricalCautions

This machine should be grounded in accordance with the National Electrical Code and local codes and ordinances. The work should be done by a qualified electrician. The machine should be grounded to protect the user from electrical shock.

WireSizes

Caution: For circuits that are a great dist ance 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 the following table is recommende d:

Conductor

length

240 volt lines 120 volt lines

0-50 feet No. 14 No. 14

50-100 feet No. 14 No. 12

Over 100 feet No. 12 No. 8

AWG (American Wire Gauge) number

SafetyRequirementsforAbrasiveSanding Machines

Abrasive sanding can be hazardous to operators and bystanders. Sanding sparks, chips and dust particles thrown off by the sanding disc can cause serious injury if contacted or inhaled. To avoid such injuries you must comply with the following safety requirements:

1. Al way s wear pr otect ive ey ewear when op erat ing machinery. Eye wear shall be impact resistant, safety glasses with side shields which comply with ANSI Z87.1. Use of eye wear which does not comply with ANSI Z87.1 specifications could result in severe injury from the breakage of the eye prot ection.

2. Wear leather safety gloves, arm guards, leather aprons and safety shoes.

3. A dust collection system is recommended. The operator should also wear a dust mask at all times.

4. Additional precautions may be necessary for sanding materials which are flammable or have

other hazardous properties. You should always consult the manufacturer of such materials for instructions on sanding and handling.

5. Do not force or jam the workpiece into the sanding disc.

6. Before sanding, always allow the motor to come up to operating speed, then check the sanding disc for wobble, run-out, or any unbalanced condition. If the disc is not operating accurately and smoothly, immediately stop the motor and make repairs before attempting any sanding operations.

7. Abrasive discs must be stored in a controlled environment . Relative humidity should be 35% to 50% and the temperature should be between 60° and 80° Fahrenheit. Failure to do so could cause premature disc fail ure.

8. Examine the face of the sanding disc carefully. Excessive sanding that wears down to the backing material can tear the disc. Never use a disc which shows backing, nicks or cuts on the surface or edge, or damage due to creasing or poor handling.

9. W hen i nst all in g a n ew di sc, be c ert ain th e dis c is accurately centered on the drive wheel. Failure to do so could cause a serious unbalanced condition.

10. Alw ay s pr esen t t he w or kpi ec e to th e wh eel wh il e rest ing t he work piece f irml y on th e table. Fail ure to do so could result in damage to the workpiece or t hrowing of the work piece off the wheel.

11. Safety shoes which comply with ANSI Z41.1 should be worn.

12. Personal hearing protection such as ear plugs or ear muffs should be used to protect against the eff ect of noise exposure.

4.0 Machine and Manual Overview

JET Abrasive Finishing Machines are available in three different configurations: disc, belt, and combination disc and belt. Each configuration is a rugged, heavy-duty machine designed for maximum high production work in an industrial environment.

The speed of stock removal and the quality of finish achieved is determined largely by the aggressiveness of the abrasive disc or belt mounted on the machine. With very aggressive grits, these machines are typically considered grinding machines. With very fine grits, these machines are typically considered sanding machines. Whatever you call them, and however you use them, the instructions in this manual will help you use them safely and productively.

You will note there are several types of electrical systems available for these machines. All of these systems are equally effective in providing power to the grinding mechanism – however, local codes and the type of environment in which the machine is used will often be a factor in your choice of system.

Instructions in this manual assume that you are using one of the Model J-4200A Series Belt and Disc machines. If you have a disc only, or belt only machine, you can bypass those instructions which do not apply to you.

If there are questions or comments, please contact your local supplier or Walter Meier. Walter Meier can also be reached at our web site: www.waltermeier.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!

5.0 Specifications

Model Stock No.

J-4200A 414551 J-4200A-2 414552 J-4202A 414553 J-4300A 414600 J-4301A 414601 J-4400A 414602 J-4401A 414603

J-4200A Disc/Belt Sander J-4300A Belt Sander J-4400A Disc Sander

Disc/Belt Sander Belt Sander Disc Sander

Disc:12x16-3/8 in.

Table size

Table tilt (both) 45° down, 20° up 45° down, 20° up 45° down, 20° up Miter gauge groove Disc diameter 12 in. (305mm) 12 in. (305mm)

Disc Speed 1960 RPM 1960 RPM Platen size Belt size 6x48 in. (152x1214mm) 6x48 in. (152x1214mm)

Belt speed 2850 SFM 2850 SFM Dimensions

(depth, W, H) Dimensions w/platen

vertical (depth,W, H) Dimensions w/platen

horizontal (depth, W, H)

Motor options

Weight 250 lbs. (113 kg.) 211 lbs. (96 kg.) 164 lbs. (74 kg.)

The specifications in this manual were current at time of publication, but because of our policy of continuous improvement, Walter Meier (Manufacturing) Inc., reserves the right to change specifications at any time and without prior notice, without incurring obligations.

(254x416mm) Belt: 7 3/8x14 3/4 in. (187x355mm)

(both) 3/8x3/4 in. (9.5x19mm)

6-1/4x14-3/4 in. (159x375mm)

19x16x57-1/2 in. (475x400x1437mm)

25-1/2x16x43 in. (637x400x1075mm)

Model J-4200A 1 PH 1.5HP 115/220V (prewired 115V)

Model J-4200A-2 1 PH

1.5HP 220V Model J-4202A 3 PH 1.5HP

230V/460V (prewired 230V)

7-3/8x14-3/4 in. (187x355mm)

3/8x3/4 in. (9.5x19mm) 3/8x3/4 in. (9.5x19mm)

6-1/4x14-3/4 in. (159x375mm)

19x16x57-1/2 in. (475x400x1437mm)

25-1/2x16x43 in. (637x400x1075mm)

Model J-4300A 1 PH

1.5HP 115/230V (prewired 115V)

Model J-4301A 3 PH 1.5HP 230V/460V (prewired 230V)

12x16-3/8 in. (254x416mm)

29x17x42-3/4 in. (1070x725x4250mm)

Model J-4400A 1 PH 1.5HP 115/230V (prewired 115V)

Model J-4401A 3 PH 1.5HP 230V/460V (prewired 230V)

6.0 Operating instructions

These sanders can be used to remove stock from a wide variety of machinable materials. Different materials require different grit types and grades to achieve the desired stock removal rate and surface finish. Please consult with your abrasive materials supplier for specific recommendations on the correct grit material and grade required for your specific needs.

When removing stock from soft materials (wood, plastic, etc.) these machines are typically called "sanders." When removing stock from hard materials (cast iron, steel, etc.) they are referred to as "grinders". The word "sander" is used, more-or-less consistently, throughout this manual. It refers to the machines and not the type of abrasive finishing being performed.

Before operating your sander, please read the basic instructions on safe machine usage on the preceding pages.

6.1 Belt sander

The sanding belt must be in good condition, at proper tension, and tracking correctly, before doing any sanding, grinding or other abrasive machining operations. Refer to the section on Track Mechanism Maintenance if you have any problems with belt tension or tracking.

6.2 Adjusting the belt sander table

You can tilt the table in a range between 20° upward and 45° downward. A single locking handle on the side of the table is used to lock and unlock the table to permit adjustment.

There are two positive lock stop positions: at 90° (that is, at a right angle to the platen) and at 45° downward (essentially 90° + 45° or 135° total to the platen.)

Never adjust the table angle while the sander is running. Always turn the motor off before adjusting the table angle.

To Tilt the Belt Sander Table:

1. Unlock the locking handle on the side of the

table.

2. Using the pointer and scale, set the angle to any

required angle between 20° upward and 45° downward.

3. Lock the lock handle.

Figure 1: Locking handle for belt table

6.3 Using the indexing lock handle

The lock handle (Figure 1) is spring loaded and can be repositioned on its shaft to permit easy locking and unlocking.

To Reposition the Handle:

1. Pull outward against its spring.

2. Rotate the handle to the position you require.

3. Release the handle and its spring will return it to the correct operating position.

6.4 Adjusting the belt sander arm

The arm which holds the sanding belt can be positioned at a full vertical position, a full horizontal position, or at any angle in between which is convenient to the type of sanding you are doing.

A positive stop mechanism is used to permit quick adjustment to the vertical or horizontal positions.

Never adjust the arm angle

while the sander is running. Always turn off the motor before adjusting the arm angle.

To adjust to vertical:

1. Unlock both lock bolts. These are located under the arbor cover.

2. Move the arm to vertical until it contacts its stop.

3. Tighten both lock bolts, and replace arbor cover.

To Tilt the Table to Exactly 45o:

1. Flip out the stop bracket (see Figure 20).

2. Unlock the locking handle.

3. Move the table until it contacts the stop bracket.

4. Lock the table lock handle.

Figure 2: Lock bolts for belt arm

To adjust to horizontal:

1. Unlock both lock bolts.

2. Move arm to horizontal until it contacts its stop. (See F igure 3 . )

3. Tighten both lock bolts and replace arbor cover.

Figure 3: Arm at horizontal – note that the table is removed. The table may be removed or left in position, and may also be set to any angle to allow horizontal sanding of various angles.

To adjust arm to any angle between vertical and horizontal:

1. Unlock both lock bolts.

2. Use a machinist's protractor and level to set the arm to the required angle.

3. Tighten both lock bolts and replace arbor cover.

6.6 Use of the Miter Gauge

The miter gauge can be used on either the disc or belt surfaces to sand accurate angles on workpieces. When using the gauge alone, you sand a single angle. However, by tilting the table and using the miter gauge in combination with the table tilt, it is possible to sand compound angles, as well.

When grinding a compound angle you should always check the accuracy of your setup by sanding a piece of scrap material before doing any finish sanding on the actual workpiece.

1. Set the angle you wish to sand using the scale on the miter gauge.

2. Tighten the miter gauge securely so the miter reference surface will not move while you are sanding.

3. Place the workpiece against the miter reference surface and slide it along the reference surface and into the sanding disc or belt. The basic method is shown in Figure 5, below.

6.5 Adjusting disc sander table

Never adjust the table angle while the sander is running. Always turn off the motor be fore adjusting table angle.

1. Unlock the two locking knobs underneath the

table at each end. ( See Fi gur e 4. )

2. Using the pointer and scale, set the angle to any

required angle between 20° upward and 45° downward.

3. Lock the two locking knobs underneath the table.

Figure 5: Use of the miter system

Figure 4: Disc sander table adjustment

7.0 Maintenance

7.1 Belt replacement

1. Di sco nnect t he pow er to t he machi ne to prevent

accidental start-ups. If the machine is plugged into an outlet, unplug it. If the machine is hardwired to a branch circuit with a junction box, rem ove th e fuse or trip th e circ uit br eaker to the branch.

2. Remove the lock knob and top cover (See Figure

6).

Figure 6: Top cover components

3. Remove the side guard and table.

4. Release the belt tension by turning the tension

handle in a counterclockwise direction (See Figure 7). If the handle is difficult to turn, perform Track mechanism maintenance according to the instruction s in se c tion 7.2.

5. Remove the belt.

6. Check the drums and platen for scoring or signs of wear which might require service or replacement.

7. Check the height of the platen with a straight edge. If it is not 1/32 inch above the drums, adjust it according to the instructions in Platen

Replacement or Adjustment in the Machine Setup section of this manual.

8. Check the drums for looseness which might cause tracking problems. Correct any loose condition by tightening or replacing any parts as required.

9. Slip the new belt onto the drums and platen.

10. Adjust the tension handle clockwise until the belt is flat against the platen and there is no curling or buckling of the belt in the middle.

11. Turn the drums by hand to see if the belt tracks more-or-less true. JUST BECAUSE THE OLD BELT TRACKED CORRECTLY DOES NOT MEAN THE NEW BELT WIL L. Always check the tracking when replacing a belt.

12. To adjust the tracking:

12.1. Plug the machine back into the outlet or reestab lis h power in t he br anch.

12.2. Loosen the tracking lock knob.

12.3. Jog the motor on and off as necessary to observe the tracking, and turn the tracking knob as necessary to make the belt track in the center of the platen and drums. Turn the tracking knob clockwise to move the belt toward the right and counterclockwise to move the belt toward the left.

12.4. When the belt seems to be tracking correctly, turn the motor on and leave it running while fine tuning the tracking.

12.5. Lock the tracking lock knob.

12.6. When the lock knob is secure, turn the power off and disconnect the machine from the outlet or branch as in Step 1, above.

13. Replace the table, side guard, top cover and lock knob by reversing steps 3 and 2, above.

14. If you have not already done so, reconnect the power to the machine and return it to service.

Figure 7: Belt adjustment components (Note top cover removed for removal and replacement of belt.)

7.2 Track mechanism maintenance

Whi le th e use of a dust coll ect ion sy stem can ext end service intervals, an accumulation of dust will almost certainly require periodic cleaning of the tracking mechanism. The more continuous the use of the machine, the more frequently this maintenance should be performed.

As mentioned in the preceding section, the need for required maintenance is often indicated by difficulty in adjusting the tension/tracking mecha nism.

1. With the belt removed according to the instructions in section 7.1 Belt replacement, pull out the upper tracking system and clean away all

built up material in the upper part of the bracket casting.

2. Take the two keys off of the idler pin bracket, wipe off, and re-grease.

3. Reverse the above steps to make the machine ready for reinstallation of the belt according to the Belt replacement instructions.

7.3 Installing abrasive discs

1. Disconnect power to the machine to prevent accidental start-ups.

2. Peel off the old abrasive disc.

3. Clean the drive disc surface using naptha or a similar nonflammable solvent that will dry filmfree.

4. Pull the protective backing half off the new abrasive disc.

5. Position the new disc carefully so it is centered acc urately on th e drive disc. (See F igu re 8.)

6. When accurately centered, remove the rest of the protective backing and press the abrasive disc firmly against the drive disc so complete adhesive contact is made.

7. Reconnect the power to the machine.

Figure 9: Removing belt guard

Figure 8: Installing new abrasive disc

7.4 Replacing the v-belt

1. Disconnect power to the machine to prevent accidental start-ups.

2. Remove the belt guard (Figure 9) and disc table.

3. Remove the table tilt lock knob (Figure 10).

4. Loosen the four motor bolts so the motor can slide on its plate.

Figure 10: Disc table lock knob

5. Remove th e belt from the mo tor pulley.

6. Remove three of the base mounting bolts, then loosen the fourth bolt slightly. This allows you to rotate the machine on the machine base (See Figure 11).

7. Remove the two bolts, underneath the machine casting, that secure the disc guard to the casting (See Figure 11).

Figure 11: Rotating the machine casting to remove the disc guard bolts

Figure 12: Locating the set screws that secure the disc to the arbor

8. Through the hole in the disc guard casting, locate and remove the TWO set screws that secure the drive disc to the arbor (Figure 12). One set screw clamps on the arbor key and the other clamps on the arbor shaft, itself. Be sure you loosen both of them.

9. Sli de the disc and its guard off of the machi ne, together (See Figure 13).

10. The V-belt can now be removed from the drive arbor.

11. Install the new belt on the top pulley.

Figure 13: Removing the guard and drive disc, together.

12. Slide the disc and guard back into position.

13. Reinstall the disc guard bolts underneath the table.

14. Position the drive disc so that it is no more than 1/16 inch away from the table, then tighten BOTH of the set screws by inserting the hex wrench through the hole in the disc guard casting.

15. Rotate the machine back onto its base and secure it with all four mounting bolts.

16. Inst all the bel t over the b ott om pulley.

17. Tension the belt so that when pressed, in the mid dle of its t r avel , it ha s no mo r e th an o n e bel t's width of movement – then tighten the four motor bolts.

18. Observe the alignment of the motor pulley and arbor pulley. If necessary, correct their alignment by shifting the motor slightly on its mount (which involves loosening and retightening the mounting bolts and checking tension) or by shifting the pulley slightly on the motor shaft (which involves loosening the motor pulley set screw and sliding the pulley into alignment) or by moving the arbor pulley slightly on its shaft (See Figure 14).

19. W hen the pulleys are accurately aligned, reinstall the belt guard.

20. R eest ablish electrical power t o the machine.

Figure 14: Loosening pulley set screws to allow the adjustment of pulley on arbor shaft.

8.0 Machine setup

8.2 Disc table angle adjustment

1. Disconnect power to the machine to prevent accidental start-ups.

2. Loosen the table locking knobs on either end of the table.

3. Using a machinist's square against the table and disc, set the table at exactly 90° to the disc (See Figure 15).

4. Tighten the table locking knobs.

5. Check the pointer. If it is not exactly on the zero mark, loosen the pointer attaching screw, adjust the pointer, and retighten the screw.

6. Reconnect the power to the machine.

8.1 Basic setup

1. Position the machine where it will be located on the shop floor. When positioning the machine, consider the type of work which will be done on it so you allow sufficient room not only for the wor kpieces, but also for service to the ma chin e.

2. Open the door in the base of the machine and, using the holes in the base as a template, mark the floor for the position of the hold-down bolts.

3. Mo ve the m achi ne to expo se the h old- down bol t marks and install anchors for the hold-down bolts.

4. Put the machine back over the hold-down anchors and bolt the machine securely to the shop floor. THIS MUST BE DONE FOR SAFE OPERATION OF THE MACHINE.

5. Establish an electrical service connection to the machine. This will vary according to the model purchased. ALL ELECTRICAL CONNECTIONS SHOULD BE MADE BY A QUALIFIED ELECTRICIAN WHO IS FAMILIAR WITH YOUR STATE AND LOCAL CODES. Many models of thes e mac hi nes m a k e us e o f hi g h volt ag es whi c h pose a significant risk of serious injury or DEATH if proper knowledge and precautions are not used. Electrical instructions are included in section 9.0 Electrical connections.

6. Machines with belts are shipped with the belts in slack condition. During the electrical hookup phase of machine setup, the belt will have to be tightened and checked for tracking. See the Belt Replacement section for instructions on this procedure.

Figure 15: Using a square to check the disc table scale.

8.3 Disc table miter parallelism

adjustment

1. Disconnect power to the machine to prevent accidental start-ups.

2. Set the table angle to zero.

3. Place a scale or adjustable machinist's square against either the left or right edge of the disc face and measure the distance to the miter slot edge (See Figure 16).

Figure 16: Using an adjustable square to set the table parallelism.

4. Move the measuring device to the opposite edge of the disc and measure the distance to the miter slot.

5. Adjust the table by loosening the four attachment screws under the table, then move the table until the distance between the miter slot and the disc is equal on both sides (See Figure 17).

6. Tighten the four attachment screws.

7. Reconnect the electrical power to the machine.

Figure 17: Table attachment screws – loosen to adjust miter groove parallelism.

8.5 Belt table miter slot parallelism

adjustment

1. Disconnect power to the machine to prevent accidental start-ups.

2. Set the table angle to zero.

3. Place a scale or adjustable machinist's square against either the left or right edge of the belt or platen and measure the distance to the miter slot edge (See Figure 19).

4. Move the measuring device to the opposite edge of the belt or platen and measure the distance to the miter slot.

5. Adjust the table by loosening the three attachment screws under the table, then move the t a bl e u n t il t he d i st a nc e b et ween t h e m i t er s lo t and belt or platen is equal on both sides.

6. Tighten the three attachment screws.

7. Reconnect the electrical power to the machine.

8.4 Disc table gap adjustment

1. Using a scale, check the gap between the edge of the table and the face of the disc. It should be very close to 3/32 inch. If it is much more or less than that distance, adjust it as follows:

2. Disconnect the elect r ical pow er to t he mac hine.

3. Using the access hole on the top of the disc guard, locate and loosen the two set screws that secure the disc to the shaft.

4. Slide the disc in or out along its shaft until the table-to-disc gap is 3/32 inch (See Figure 18).

5. Tighten both set screws.

6. Reconnect the electrical power to the machine.

Figure 18: Table-to-disc gap measurement.

Figure 19: Using an adjustable square to check and set miter slot parallelism on the belt table.

8.6 Belt table angle adjustment

1. Loosen the table locking handle and tilt the table upward to about 15°.

2. Flip out the stop bracket (See Figure 21).

3. Lower the table until its adjusting screw touches the stop bracket.

4. Place a m achinist's square against the table and belt or plat en.

5. If adjustment is required, turn the adjusting screw (Figure 20) until the table is exactly square to the platen.

6. Check the pointer. If it is not on 0°, loosen the pointer screw and adjust the pointer until it is on 0°.

7. Tighten the pointer screw.

8. Loosen the table lock handle and tilt the table until its stop contacts the 45° stop position.

9. Using a machinist's protractor set on 135° (90° + 45°) adjust the screw until the table and platen are in correct adjustment. DO NOT reset the pointer after this operation.

Figure 20: Location of adjustment (socket head) screws and pointer attachment screw for table angle adjustment.

Figure 21: Locations of stop lugs and stop bracket for zero and 45° table positions.

8.7 Adjusting or replacing the platen

1. Disconnect th e elec trical power to t he ma chine t o prevent accidental start-ups.

2. Remove the top cover, side guard and belt as outlined in section 7.1, Belt replacement.

3. Remove the table by unscrewing the locking handling and lifting the complete table assembly, from the machine.

4. If you are replacing the platen, remove the three screws that hold it to its mount -- then install the new platen and replace the mounting screws finger tight.

5. If you are only adjusting the platen, loosen the three mounting screws to allow adjus tment .

6. Using a straight edge as shown in Figure 22, adjust the platen height until i t i s 1/32 inch higher than the crown of both the drive and idler drums.

7. Tighten the platen adjustment screws.

8. Reinst all the ta ble an d belt .

9. Check and adjust, if necessary, the tracking of the belt according to instructions in section 7.1, Belt replacement.

10. Reinstall the guards and covers.

11. Check and adjust the table angles and miter slot squareness according to table adjustment instructions in this manual.

12. Reconnect the electrical power to the machine.

Figure 22: Method for adjusting height of platen above drive and idler drums.

9.0 Electrical connections

Caution: JET sanders are available in a wide variety of el ectric al configura tions to meet the n eeds of the purchaser with respect to power available and compliance with electrical codes. Each machine is tested at the factory for operation before shipment and the power cord is tagged with the power requirements for the machine, as shipped.

HOWEVER, before attempting any electrical hookup, you should be certain:

1. The electrical characteristics of the service branch match the requirements of the motor.

2. The service branch is equipped with wires of the required gauge or size.

3. The branch circuit intended for the machine is protected with a time delay fuse or circuit breaker with rated amperage just slightly greater than the full load current of the motor.

MOTOR AMPERAGE full load current

Phase Voltage Amperage 1 115 20 1 220 10 3 220 5.2 3 440 2.6

All electrical service work on your JET sander should be performed by a qualified, licensed electrician who is familiar with all safe standard electrical installation practices and all applicable electrical codes. This includes local electrical codes which may affect the connection and operation of the sander in your specific manufacturing operation.

9.1 Single phase electrical hookup

When connecting your machine to single phase power, you may be connecting to either 115 or 230 volts, depending upon the motor type provided. Local codes may, or may not, permit the use of a plug type of connection for your machine. Where a plug connection is permitted, the following installation practices must be followed:

1. The plug used must be a grounding type of plug.

That is, on a 115 volt single phase connection, the plug must be a three-prong plug with two flat, parallel blades for the power wires and a single rounded or U-shaped prong for the ground connection. On 230 volt single phase connections, the lug must be a three prong plug with two flat blades in tandem to carry the current, and a third round or U-shaped prong for the ground connection.

2. The service branch to which the plug is

connected must be a branch with a separate ground wire so the grounding prong of the plug can be connected to ground effectively.

Note: Local electrical codes in many jurisdictions DO NOT ALLOW THE USE OF PLUG TYPE CONNECTIONS FOR SINGLE PHASE POWER WHEN THE MACHINE IS USED IN A COMMERCIAL OR INDUSTRIAL ESTABLISHMENT.

In t hese c ases you m ust connect y our machi ne to the service branch using a hardwired junction box connection.

machine connection is made and the time delay fuse or circuit breaker should be a value just slightly higher than the maximum load current draw.

9.2 Three phase electrical hookup

1. Be certain the power to the branch you are connecting is off and locked out, so power cannot be reestablished accidentally.

2. Connect the ground wires. These wires will be eit her g reen, or green with a w hit e stri pe.

3. Connect the remaining three cable wires to the three po wer wi res in the serv ice branc h.

4. Reestablish the power to the branch.

Motorrotation

The motor should be turning counterclockwise, the belt sander should be moving downward and the disc sander should be turning clockwise. If this is the case, the machine can be considered wired correctly. If the motor is not turning in the correct direction, take the following corrective action:

1. Disconnect power in the branch again and be certain it cannot be accidentally turned on while you correct the wiring.

2. Reverse ANY TWO of the power wires to the machine.

3. Rees tab l ish the p ower to the machi ne.

4. Turn the machine on. The motor should now be turning in the correct direction.

Voltageconversion

Three phase machines are pre-wired for 230V or 460V per customer request. If it becomes necessary to change the voltage:

1. Remove back cover from the base and place machine on its side.

Motorrotation

The motor's rotation should result in the belt sander moving downward and the disc sander rotating counterclockwise.

Voltageconversion

Single phase machines are pre-wired for 115V or 230V per customer request. If it becomes necessary to change the voltage, remove the back cover from the base and place the machine on its side. Remove the terminal cover from the motor. Rewire the motor acc or din g to th e mot o r c onnec ti on di agr am in s ecti o n

12.1. Different electrical plugs are required depending on which voltage you select. This completes the voltage conversion process.

Circuitprotection

2. Remove terminal cover from motor. Rewire the motor according to the motor connection diagram in section 12.2.

3. Replace the current magnetic switch with the 460V switch (p/n 4202A-5095, purchased separately – see your dealer or contact W alter Meier to order).

4. This completes the voltage conversion process.

Circuitprotection

Where the service branch is protected with a fuse or circuit breaker that has too high a value to offer protection to the motor supplied, a fuse or circuit breaker box should be used at the point where the machine connection is made and the time delay fuse or circuit breaker should be a value just slightly higher than the maximum load current draw.

10.0 Troubleshooting

Symptom Possible Cause Correction

Motor will not r un Voltage is too lo w. Check power suppl y for prop er v olt a g e.

Branch circuit fuse is blown or circuit breaker is tripped.

Branch is shut down for service. Check all personnel and machines on

Open circuit in the wiring. Inspect all wire connections for loose or

Motor is defective. Replace the motor. Switch is defective. Replace the switch.

Motor stalls easily Low voltage. Check for proper voltage at the motor;

Fuse blown (three phase motors only). Replace the blown fuse. Improper wiring. Check for proper connections.

Abrasive belt or disc slows down although motor keeps running at working speed

Poor tracking Tracking is out of adjustment. Adjust the belt tracking.

Belt is slipping. Replace the belt.

Too much belt tension. Loosen the tension until the belt is just taut.

Determine the reason for the blown fuse or tripped circuit breaker; then replace the fuse or r eset the breaker.

the branch to be certain someone has not shut down the branch for service. DO NOT repl ace th e fuse or reset the br eaker unless you are certain no personnel are working on the machines, wires or controls in the cir cuit .

open connections.

correct as necessary.

Not enough belt tension. Tighten the tension until the belt is more taut. Belt is jointed improperly. Check belt for an irregular seam or shape. Lack of crown on the drive roller. Remove the belt and put a straight edge

along the drive roller. There should be a slight crown (high spot toward the middle of the roller.) If the crown has worn away, replace th e r oll er.

Worn bearings. Check all the bearings for excessive heat or

loose shafts. Replace if necessary.

Unsteady belt Slack in the abrasive belt Adjust the belt tension. Short belt life Excessive pressure applied while

grinding.

Working on only one side of the belt or only in one area of the disc.

Incorrect abrasive material or grit size. Check with your abrasives supplier for

CAUTION: For all of the electrical faults and corrections in the above table JET recommends the use of a qualified and licensed electrician for all circuit tracing, diagnosis and repair.

Allow the belt to do the cutting. Excessive pressure only dulls the grit and removes it from the cloth.

Use all surface areas of the abrasive cloth.

recommendations on the type and coarseness of the abrasive required for the wor kpieces y ou ar e sanding or gri ndi ng.

11.0 Replacement parts

Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-800-2746848 Monday through Friday (see our website for business hours, www.walt erm eier.com). Having t h e Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately.

11.1.1 Model J-4200A Belt and Disc Sander Assembly – Exploded View

11.1.2 Model J-4200A Belt and Disc Sander Assembly – Parts List

IndexNo PartNo Description Size Qty

1 ................ J-5508427 ................. Bracket..................................................................... ...................................... 1

2 ................ 5511833 .................... Square Nut............................................................... M10 ............................... 1

3 ................ 5051081 .................... Spring ...................................................................... ...................................... 1

4 ................ 5051091 .................... Sleeve ...................................................................... ...................................... 1

5 ................ 5051131 .................... Collar ....................................................................... ...................................... 1

6 ................ 5508431 .................... Shaft with Collar....................................................... ...................................... 1

7 ................ J-5051151 ................. Cap .......................................................................... ...................................... 1

8 ................ TS-2361051 .............. Lock Washer ............................................................ M5 ................................. 2

9 ................ TS-1513051 .............. Socket Head Flat Screw .......................................... M5x25 ........................... 2

10 .............. 5051721 .................... Hand Wheel ............................................................. ...................................... 1

12 .............. TS-1550071 .............. Flat Washer ............................................................. M10 ............................... 2

13 .............. J-5508432 ................. Tilting Table ............................................................. ...................................... 1

14 .............. 5508450 .................... Hand Knob ............................................................... ...................................... 4

15 .............. 5508429 .................... Belt Adjustment Knob .............................................. M10 ............................... 1

16 .............. 5511824 .................... Drive Screw ............................................................. Ø2x5 ............................. 5

17 .............. 5508437 .................... Stop Lock ................................................................. ...................................... 1

18 .............. 5511828 .................... Groove Pin ............................................................... Ø5x45 ........................... 1

19 .............. 5051351 .................... Tilting Scale ............................................................. ...................................... 1

20 .............. TS-1523011 .............. Socket Set Screw .................................................... M6x6 ............................. 2

21 .............. 5511827 .................... Groove Pin ............................................................... Ø4x8 ............................. 2

22 .............. 5051331 .................... Segment .................................................................. ...................................... 1

23 .............. 5511725 .................... 4200 Arbor Pulley .................................................... ...................................... 1

24 .............. TS-1504061 .............. Socket Head Cap Screw.......................................... M8x30 ........................... 4

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

26 .............. J-5508433 ................. Trunnion................................................................... ...................................... 1

27 .............. TS-1550061 .............. Flat Washer ............................................................. M8 ................................. 9

28 .............. TS-2361081 .............. Lock Washer ............................................................ M8 ................................. 9

29 .............. TS-1490041 .............. Hex Cap Screw ........................................................ M8x25 ........................... 3

30 .............. 5508435 .................... Stud ......................................................................... M10 ............................... 1

31 .............. TS-1550071 .............. Flat Washer ............................................................. M10 ............................... 4

32 .............. 5508436 .................... Acorn Nut and Handle ............................................. ...................................... 1

33 .............. TS-2361061 .............. Lock Washer ............................................................ M6 ................................. 3

34 .............. TS-1482031 .............. Hex Cap Screw ........................................................ M6x16 ........................... 3

35 .............. 5508439 .................... Preload Bushing ...................................................... M54 ............................... 1

36 .............. BB-6205ZZ ................ Ball Bearing ............................................................. 6205ZZ.......................... 1

37 .............. J-5508438 ................. Bearing Housing ...................................................... ...................................... 1

38 .............. TS-2210951 .............. Hex Cap Screw ........................................................ M10x140 ....................... 2

39 .............. 5051421 .................... Key........................................................................... 5x5x70 mm ................... 1

40 .............. 5508441 .................... Drive Shaft ............................................................... ...................................... 1

41 .............. 5051451 .................... Key........................................................................... 5x5x35 mm ................... 1

42 .............. 4200A-042................. Key........................................................................... 5x5x55 mm ................... 1

43 .............. BB-6204ZZ ................ Ball Bearing ............................................................. 6204ZZ.......................... 1

44 .............. 5051471 .................... Retaining Ring ......................................................... S20................................ 1

45 .............. VB-A59 ...................... V-Belt ....................................................................... 17610 ............................ 1

46 .............. TS-2245081 .............. Socket Head Flat Screw .......................................... M5x8 ............................. 4

47 .............. J-5508444 ................. Belt Guard Assembly ............................................... ...................................... 1

49 .............. TS-1540071 .............. Hex Nut, Full ............................................................ M10 ............................... 5

50 .............. 5508446 .................... Stop Pin ................................................................... ...................................... 1

51 .............. J-5508447 ................. Base......................................................................... ...................................... 1

52 .............. TS-2210801 .............. Hex Cap Screw ........................................................ M10x80 ......................... 4

53 .............. TS-1550071 .............. Flat Washer ............................................................. M10 ............................... 8

54 .............. TS-2361101 .............. Lock Washer ............................................................ M10 ............................... 6

55 .............. 5051841 .................... Garnet Belt............................................................... ...................................... 1

56 .............. J-5508455 ................. Deflector Plate ......................................................... ...................................... 1

57 .............. TS-2361051 .............. Lock Washer ............................................................ M5 ................................. 2

58 .............. TS-1513021 .............. Socket Head Flat Screw .......................................... M5x12 ........................... 2

59 .............. J-5508454 ................. Drive Drum Guard.................................................... ...................................... 1

60 .............. 5508456 .................... Dust Deflector .......................................................... ...................................... 1

61 .............. TS-2361101 .............. Lock Washer ............................................................ M10 ............................... 3

62 .............. TS-1491021 .............. Hex Cap Screw ........................................................ M10x20 ......................... 3

IndexNo PartNo Description Size Qty

63 .............. J-5508457 ................. Platen....................................................................... ...................................... 1

64 .............. TS-1514011 .............. Socket Head Flat Screw .......................................... M6x12 ........................... 2

65 .............. J-5051601A ............... Side Guard............................................................... ...................................... 1

66 .............. TS-1540231 .............. Hex Nut .................................................................... M24x18 ......................... 1

67 .............. 9058121 .................... Lock Washer, Ext..................................................... M24 ............................... 1

68 .............. 5051981 .................... Spacer ..................................................................... ...................................... 1

69 .............. 5051971A .................. Drive Drum............................................................... ...................................... 1

70 .............. 5508458 .................... Clamp Ring .............................................................. ...................................... 1

71 .............. 5544728 .................... Drum Spacer............................................................ ...................................... 2

72 .............. 5051031 .................... Tension Lever Pin .................................................... ...................................... 1

73 .............. 5051021 .................... Belt Tension Lever ................................................... ...................................... 1

74 .............. BB-6202ZZ ................ Ball Bearing ............................................................. 6202ZZ.......................... 2

75 .............. 5508461 .................... Idler Drum Shaft with Lock Nut ................................ ...................................... 1

76 .............. TS-2342121 .............. Nylon Lock Hex Nut ................................................. M12 ............................... 2

77 .............. 5508460 .................... Bearing Lock Nut ..................................................... ...................................... 1

78 .............. J-5051591A ............... Idler Drum Guard ..................................................... ...................................... 1

79 .............. 5508462 .................... Stud ......................................................................... ...................................... 3

80 .............. 5508463 .................... Clamp Bar ................................................................ ...................................... 2

81 .............. J-5052121 ................. Bottom Guard .......................................................... ...................................... 1

82 .............. TS-2361061 .............. Lock Washer ............................................................ M6 ................................. 4

83 .............. 5052061B .................. Idler Drum Spacer.................................................... ...................................... 2

84 .............. J-5508459 ................. Idler Pin Bracket ...................................................... ...................................... 1

85 .............. TS-0367061 .............. Roll Pin .................................................................... 1/4”x1-1/4”..................... 2

86 .............. 5052001 .................... Block ........................................................................ ...................................... 2

87 .............. 5052061A .................. Idler Drum ................................................................ ...................................... 2

88 .............. 5508434 .................... Pointer ..................................................................... ...................................... 1

89 .............. 5508451 .................... Clamp with Pins ....................................................... ...................................... 2

90 .............. 4200A-090................. Roll Pin .................................................................... Ø6x45 ........................... 4

91 .............. J-5508453 ................. Disc Guard ............................................................... ...................................... 1

92 .............. TS-2239551 .............. Socket Head Cap Screw.......................................... M10x55 ......................... 2

93 .............. 5051741 .................... Pointer ..................................................................... ...................................... 1

94 .............. TS-1523031 .............. SHSS ....................................................................... M6x10 ........................... 2

95 .............. 5051641 .................... Disc, Aluminum ........................................................ ...................................... 1

96 .............. 5051631 .................... Garnet Disc .............................................................. ...................................... 1

97 .............. 5051681 .................... Trunnion................................................................... ... ................................... 2

98 .............. TS-1490041 .............. Hex Cap Screw ........................................................ M8x25 ........................... 4

99 .............. J-5508449 ................. Table ........................................................................ ...................................... 1

100 ............ 5051701 .................... Tilting Table Scale ................................................... ...................................... 1

101 ............ 5052271 .................... Deluxe Miter Gauge ................................................. ...................................... 1

102 ............ TS-1550071 .............. Flat Washer ............................................................. M10 ............................... 2

103 ............ TS-1482032 .............. Hex Cap Screw ........................................................ M6x16 ........................... 4

104 ............ 4200A-104J ............... JET Logo Plate ........................................................ ...................................... 1

105 ............ 4200A-105................. Label, Direction ........................................................ ...................................... 2

106 ............ TS-1482081 .............. Hex Cap Screw ........................................................ M6x40 ........................... 2

107 ............ TS-1540041 .............. Hex Nut, Full ............................................................ M6 ................................. 2

108 ............ TS-1523021 .............. Socket Head Flat Screw .......................................... M6x8 ............................. 1

111 ............ 5511818 .................... Flat Head Screw ...................................................... M5x6 ............................. 4

113 ............ 4200A-113................. Sponge .................................................................... 300x 7.5mm, t=2mm ...... 2

11.2.1 Model J-4300A Belt Sander Assembly – Exploded View

11.2.2 Model J-4300A Belt Sander Assembly – Parts List