Powermatic DDS-225, DDS-237 User Manual

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Operating Instructions and Parts Manual

Dual Drum Sander

Model: DDS-225, DDS-237

WMH TOOL GROUP

Warranty and Service

WMH Tool Group, 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 WMH Tool Group Authorized Service Centers can authorize warranty repair, assist you in obtaining parts, or perform routine maintenance and major repair on your POWERMATIC Center in your area call 1-800-274-6848.

MORE INFORMATION

WMH Tool Group is consistently adding new products to the line. For complete, up-to-date product information, check with your local WMH Tool Group distributor, or visit powermatic.com.

WARRANTY

POWERMATIC products carry a limited warranty which varies in duration based upon the product.

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 POWERMATIC warranty lasts for the time period specified in the product literature of each product.

WHAT IS NOT COVERED?

The Five Year Warranty does not cover products used for commercial, industrial or educational purposes. Products with a Five Year Warranty 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 handling and shipping 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

WMH TOOL GROUP 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.

WMH TOOL GROUP SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY, OR FOR INCIDENTAL, CONTINGENT, SPECIAL, 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.

WMH Tool Group sells through distributors only. The specifications in WMH catalogs are given as general information and are not binding. Members of WMH Tool Group 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.

tools. For the name of an Authorized Service

Warranty and Service.................................................................................................................................... 2

Table of Contents.......................................................................................................................................... 3

Warnings ....................................................................................................................................................... 4

Features ........................................................................................................................................................ 6

Specifications ................................................................................................................................................ 6

Unpacking .....................................................................................................................................................7

Shipping Contents ..................................................................................................................................... 7

Assembly....................................................................................................................................................... 8

Handwheel Assembly................................................................................................................................ 8

Dust Ports.................................................................................................................................................. 8

Dust Collection ..........................................................................................................................................8

Electrical Connections................................................................................................................................... 8

Abrasive Paper Installation ...........................................................................................................................9

Adjustments ................................................................................................................................................10

Drum Height ............................................................................................................................................10

Pressure Rollers ...................................................................................................................................... 11

Table Height ............................................................................................................................................ 11

Table Parallelism .....................................................................................................................................11

Lead Screw Thread Clearance................................................................................................................12

Conveyor Belt ..........................................................................................................................................13

Drive Belts ...............................................................................................................................................13

Pulley Alignment......................................................................................................................................14

Changing Belts ........................................................................................................................................ 14

Maintenance................................................................................................................................................ 15

Operations................................................................................................................................................... 15

Basic Operation .......................................................................................................................................15

Stock Feeding Angle ...............................................................................................................................15

Multiple-Piece Sanding Runs ..................................................................................................................16

Edge Sanding ..........................................................................................................................................16

Sanding Imperfect Stock ......................................................................................................................... 16

Face Frames & Raised Panel Doors....................................................................................................... 16

Reversing Conveyor Direction................................................................................................................. 16

Abrasives.....................................................................................................................................................16

Maintenance Checklist ................................................................................................................................ 18

Troubleshooting ..........................................................................................................................................18

Performance Problems............................................................................................................................ 18

Mechanical & Electrical Problems ........................................................................................................... 19

Parts – DDS-225 Sander ............................................................................................................................ 20

Drum Assembly – DDS-225 .................................................................................................................... 20

Conveyor Assembly – DDS-225.............................................................................................................. 22

Motor & Cabinet Assembly – DDS-225................................................................................................... 24

Gearbox Assembly – DDS-225 Drum .....................................................................................................27

Parts – DDS-237 Sander ............................................................................................................................ 29

Drum Assembly – DDS-237 .................................................................................................................... 29

Conveyor Assembly – DDS-237.............................................................................................................. 31

Motor and Cabinet Assembly – DDS-237 ...............................................................................................33

Gearbox Assembly – DDS-237 ............................................................................................................... 36

Optional Accessories ..................................................................................................................................38

Ready-To-Cut Abrasive Strips................................................................................................................. 38

Other Accessories ................................................................................................................................... 38

Wiring Diagram ...........................................................................................................................................39

Warnings

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 drum sander 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 drum sander, do not use until proper training and knowledge have been obtained.

5. As with all machines, there is a certain amount of hazard involved with the use of this drum sander.

Use the machine with the respect and caution demanded where safety precautions are concerned. When normal safety precautions are overlooked or ignored, personal injury to the operator can result.

6. Do not use this drum sander for other than its intended use. If used for other purposes, WMH Tool

Group disclaims any real or implied warranty and holds itself harmless from any injury that may result from that use.

7. Always wear approved safety glasses/face shields while using this drum sander. Everyday

eyeglasses only have impact resistant lenses; they are not safety glasses.

8. Before operating this drum sander, remove tie, rings, watches and other jewelry, and roll sleeves up

past the elbows. Remove all loose clothing and confine long hair. Non-slip footwear or anti-skid floor strips are recommended. Do not wear gloves.

9. Wear ear protectors (plugs or muffs) during extended periods of operation.

10. Some dust created by power sanding, sawing, grinding, drilling and other construction activities

contain chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

• Lead from lead based paint.

• Crystalline silica from bricks, cement and other masonry products.

• Arsenic and chromium from chemically treated lumber.

Your risk of exposure varies, depending on how often you do this type of work. To reduce your exposure to these chemicals, work in a well-ventilated area and work with approved safety equipment, such as face or dust masks that are specifically designed to filter out microscopic particles.

11. Do not operate this machine while tired or under the influence of drugs, alcohol or any medication.

12. Make certain the machine is properly grounded.

13. Except for the feed rate control, make all machine adjustments or maintenance with the machine

unplugged from the power source. A machine under repair should be RED TAGGED to show it must not be used until maintenance is complete.

14. Before turning on machine, remove all extra equipment such as keys, wrenches, scrap, and cleaning

rags away from the machine.

15. 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.

16. 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.

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

18. Keep the floor around the machine clean and free of scrap material, saw dust, oil and other liquids to

minimize the danger of tripping or slipping. Be sure the conveyor table is free of all scrap, foreign material and tools before starting sanding operations.

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

20. Make your workshop child proof with padlocks, master switches or by removing safety keys.

21. Give your work undivided attention. Looking around, carrying on a conversation and “horse-play” are

careless acts that can result in serious injury.

22. Maintain a balanced stance at all times so that you do not fall or lean against the blade or other

moving parts. Do not overreach or use excessive force to perform any machine operation.

23. 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 safer.

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

25. Maintain tools in top condition. Keep tools sharp and clean for safe and best performance. Dull tools

increase noise levels and can cause kickbacks and glazed surfaces. Check the condition and adjustment of the tools before making any cuts.

26. Keep hands outside the machine. NEVER reach under the guards to try to clear stock that stops

feeding. Do not clear chips and sawdust with hands; use a brush. Do not have any part of the hands under that part of the board that is over the table when starting a cut; the pressure roller will engage the board and force it down against the table causing a pinching action.

27. Do not attempt to sand boards with loose knots or with nails or other foreign material, on its surface.

Do not attempt to sand twisted, warped, bowed or “in wind” stock unless one edge has been jointed for guiding purposes prior to sawing.

28. Do not attempt to sand long or wide boards unsupported where spring or weight could cause the

board to shift position.

29. If the operator leaves the machine area for any reason, the sander should be turned "off" and come to

a complete stop before his departure. In addition, if the operation is complete, he should clean the sander and the work area. NEVER clean the machine with power "on" and never use the hands to clear sawdust and debris; use a brush.

30. Turn off the machine before cleaning. Use a brush or compressed air to remove chips or debris — do

not use your hands.

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

32. Never leave the machine running unattended. Turn the power off and do not leave the machine until it

comes to a complete stop.

33. 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:

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

possible machine damage.

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

even death.

Features

Specifications

Model Number.................................................... DDS-225 ....................... DDS-237....................... DDS-237

Stock Number .....................................................1791290 ........................ 1791320 ........................ 1791321

Main Motor .......................................................see below ......................see below ...................... see below

Main Motor Speed (RPM) ........................................1,725 ............................. 1,725 ............................. 1,725

Electrical Controls ............................................see below ...................... see below ...................... see below

Conveyor Motor.................................................see below ......................see below ......................see below

Conveyor Speed (SFPM) .................................... 8 and 12 ........................8 and 12 ........................ 8 and 12

Sanding Drum Diameter (in) ...........................................6 ....................................6 .................................... 6

Drum Length (in) ........................................................... 25 .................................. 37 .................................. 37

Drum Speed (RPM).................................................. 1,700 .............................1,700 ............................. 1,700

Maximum Board Width (in)............................................25 .................................. 37 .................................. 37

Maximum Board Thickness (in).................................5-1/4 ..............................5-1/4 ..............................5-1/4

Minimum Board Length (in)............................................. 9 .................................... 9 .................................... 9

Minimum Board Thickness (in) ..................................1/32 ............................... 1/32 ............................... 1/32

Dust Port Diameter............................................. two @ 4” ....................... two @ 4” ........................two @ 4”

Dust Collection Capacity Required (CFM) ................ 1200 ............................. 1,200 ............................. 1,200

Shipping Weight (lbs) ..................................................840 ............................. 1,142 ............................. 1,142

Net Weight (lbs) ..........................................................730 ................................ 962 ................................ 962

Overall Dimensions (L x W x H).................... 43 x 44 x 43.................. 60 x 45 x 45 .................. 60 x 45 x 45

Main Motor

S/N 1791290 ........................................................................................(TEFC) 5HP, 1Ph, 230V, 60Hz

S/N 1791320 .................................................................................... (TEFC) 7.5HP, 1Ph, 230V, 60Hz

S/N 1791321 ................................................... (TEFC) 10HP, 3Ph, 230/460V (prewired 230V), 60Hz

Conveyor Motor

S/N 1791290 .....................................................................................(TEFC) 1/4HP, 1Ph, 230V, 60Hz

S/N 1791320 .................................................................................... (TEFC) 1/4HP, 1Ph, 230V, 60Hz

S/N 1791321 .................................................. (TEFC) 1/4HP, 3Ph, 230/460V (prewired 230V), 60Hz

Electrical Controls (all models)............................................................... 230V magnetic w/ reversing switch

The specifications in this manual are given as general information and are not binding. WMH Tool Group reserves the right to effect, at any time and without prior notice, changes or alterations to parts, fittings, and accessory equipment deemed necessary for any reason whatsoever.

Unpacking

Open the shipping crate and check for shipping damage. Report any damage immediately. Read the owner’s manual thoroughly for assembly, maintenance and safety instructions.

Shipping Contents

Note 1: Some parts are inside a box in the cabinet.

Note 2: Models DDS-225 and DDS-237 Drum

Sanders come from the factory with the first set of abrasive strips installed with 80 grit sandpaper on the front drum and 100 grit on the rear drum.

1 dual drum sander 1 handwheel 1 handle assembly 1 handwheel post 2 dust ports 2 open end wrenches (12-14mm and 17-19mm) 4 hex wrenches (2, 3, 4, and 5mm) 1 manual 1 warranty card Installation and Assembly

Tools needed

1 forklift or hoist with straps 1 14mm open-end wrench (provided) 1 cross-point screwdriver 1 flat head screwdriver 1 set of hex wrenches (provided) Remove the screws holding the sander to the

pallet and use a forklift or hoist to lift the sander off the pallet. DO NOT lift directly under the drums or rollers, as it may damage them.

The sander should be placed in a well-lit area with a sturdy floor and good ventilation. Leave enough space around the machine for loading and offloading stock and general maintenance work.

Exposed metal surfaces, such as the shafts on the drums and pressure rollers, have been given a protective coating at the factory. This should be removed with a soft cloth moistened with kerosene. Do not use acetone, gasoline, or lacquer thinner for this purpose. Do not use solvents on plastic parts, and do not use an abrasive pad because it may scratch the surfaces.

Assembly

Handwheel Assembly

1. Slide the post up into the handwheel and

secure with the set screws, as shown in Fig 1.

2. Use a flat head screwdriver to screw the bolt of

the handle as far as it will go into the threaded hole of the handwheel, then tighten the hex nut down against the handwheel (Fig. 1).

The handle must rotate freely after tightening the hex nut. If the handle is too tight, loosen the hex nut and back out the bolt slightly, then re-tighten the hex nut.

3. The handwheel assembly, used for raising and

lowering the conveyor table, is designed to be mounted and removed quickly. Set the handwheel assembly down into the hole of the hood (Fig. 2) and rotate it until it seats itself upon the pins of the leadscrew below.

Note: The handwheel must be removed before the hood can be opened.

Dust Ports

Figure 1

Mount the two dust ports to the top of the hood with eight 3/16 x 1/2 screws and eight flat washers (Fig. 2).

Dust Collection

It is strongly recommended that you connect a proper dust extraction system to the two 4” ports atop the sander. Make sure the capacity of your dust collector is at least 1200 CFM.

Electrical Connections

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

A power plug is not provided with the DDS-225 or DDS-237 Dual Drum Sander. You may either connect the proper UL/CSA listed plug or “hardwire” the machine directly to your electrical panel provided there is a disconnect near the machine for the operator. Consult electrical drawings on pages 39-42 for further clarification of wiring setup.

Figure 2

Make sure the voltage of your power supply matches the specifications on the motor plate of the machine.

Extension Cords

The use of an extension cord is not recommended, but if one is necessary, make sure the cord rating is suitable for the amperage listed on the machine's motor plate. An undersize cord will cause a drop in line voltage resulting in loss of power and overheating.

The chart in Table 1 shows the correct size cord to use based on cord length and motor plate amp rating. If in doubt, use the next heavier gauge. The smaller the gauge number, the heavier the cord.

This machine must be grounded. Grounding provides a path of least resistance to help divert current away from the operator in case of electrical malfunction. The green wire is the grounding wire.

Table 1

Abrasive Paper Installation

Disconnect machine from power source.

Proper attachment of the abrasive strips to the drums is important for achieving top performance from the sander.

See page 38 for a list of available abrasive strips with their respective grits and some tips on choosing the proper strip for a particular job. If using different size grits simultaneously, always place the coarser grit on the front drum.

Attach the abrasive paper as follows:

1. Open the hood by removing the handwheel

and turning the two locking handles at the front counterclockwise.

2. Remove the socket head cap screw and

locking wedge (Fig. 3) from both ends of the drum.

Note: If the wedge sticks, use a flat head screwdriver as leverage to free it.

Figure 3

3. Cut a length of the Ready-To-Cut abrasive

strip (12' for the DDS-225, 16' 5" for the DDS-237). This will be enough to cover one drum.

Note: The taper on the remaining roll can later be used for the starting edge of your next strip.

4. Mark and cut a taper at the right end of the

abrasive strip (Fig. 4). Because the tapered end should use all of the recess at the right side of the drum, its end must be trimmed back leaving an edge of about 1/2 inch, as shown. Now trim the left side of the abrasive paper in a similar manner (Fig. 5).

Note: An alternate method of tapering the ends of the abrasive strip is to place the removed sandpaper strip on top of the new strip and to use this as a template.

5. Begin at the right end of the drum and tuck the

tapered right end of the abrasive roll into the recess (Fig. 3). Place the locking wedge into the recess and tighten firmly with the socket head cap screw.

6. Begin wrapping the strip around the drum,

keeping it taut as you go. The tapered cut of the strip should follow the right edge of the drum. Continue to wrap the abrasive in a clockwise spiral fashion by rotating the drum with your left hand and guiding the strip with your right hand (Fig. 6). Successive windings of the strip should be flush with previous windings without any overlap.

Figure 4

Figure 5

Figure 6

7. The left end of the drum which contains the

recess is an independent piece (Fig. 7) that can be rotated on the drum. This fastener is spring-tensioned to take up any slack and hold the abrasive strip firmly to the drum. Rotate this fastener backward and hold it there with your thumb as shown in Fig. 7.

8. Tuck the tapered left end of the strip into the

recess, as shown in Fig. 7, then insert the locking wedge and socket head cap screw, tightening the screw until the locking wedge is firmly seated.

9. Release the spring-tensioned fastener. The

abrasive strip is now ready for use.

10. Repeat this procedure for the other drum.

Adjustments

Drum Height

When using different abrasive grits on the drums, the height of the drums from the workpiece must vary. To achieve this, the back drum (which should always have the finer grit) has been designed for easy adjustment.

1. Loosen the locking levers (Fig. 8) on both

sides of the machine by rotating them counterclockwise.

2. Rotate the adjustment knob to the desired

measurement, using the red triangular indicator at the base of the dial. A label is affixed below the locking lever showing the proper settings. It is also shown in Fig. 9.

3. Repeat this dial setting on the opposite end of

the drum.

Note: It is important that the dial setting be identical at both ends of the drum.

Figure 7

Figure 8

4. Tighten the locking levers (Fig. 8) by rotating

clockwise, before operating the sander.

Note: The locking levers are spring loaded – you can move the handle to any position by pulling out on the lever, rotating it on the hub, then releasing.

Important: After changing abrasive strips, always check and, if necessary, reset the back drum height.

Figure 9

Pressure Rollers

The pressure rollers (Fig. 10) maintain tension upon the workpiece as it passes through the machine. The spring tension of the pressure rollers has been factory set. If a board refuses to pass through the machine, or the finished surface of a board is uneven, the spring tension of the pressure rollers may need adjusting.

1. Loosen the hex nut (A, Fig. 10).

2. Place a 17mm wrench over the flat on the

adjusting screw (B, Fig. 10) and lower the screw to increase the roller pressure on the workpiece; or raise the screw to decrease the pressure.

3. Retighten hex nut (A, Fig. 10).

4. Repeat this same adjustment at the opposite

end of the roller to maintain parallel.

5. Repeat procedure for other two pressure

rollers.

Do not over tighten the adjusting screw, as excess roller pressure will prevent the workpiece from passing through the machine, and may cause the conveyor belt to stop.

Figure 10

Table Height

Rotate the handwheel until the depth gauge (Fig. 11) reads the appropriate depth. One revolution of the handwheel moves the table approximately 1/16”.

A limit plate (Fig. 11) is mounted to the front of the sander. If the table has been set too high, the workpiece will contact this plate and a limit switch will shut off the conveyor table. If this happens, reposition the table and restart the machine.

Table Parallelism

The conveyor table has been set parallel to the drums at the factory. If the conveyor table should ever need adjusting to bring it back into parallel with the drums, proceed as follows:

1. Remove the front cover plate below the table

to expose the chain. Also remove the rear cover plate.

2. Loosen the socket head cap screw on the

chain tensioner (Fig. 12) and slide the chain tensioner assembly forward to slacken the chain.

3. Remove the chain from around all four

sprockets.

Figure 11

Figure 12

4. Insert a tool, such as a hex wrench or

screwdriver, through the hole on top of the leadscrew (Fig 13) at that corner of the table that is lowest.

5. Turn the leadscrew clockwise to raise the

table.

6. When the adjustment is complete, install the

chain over the four sprockets, and over the chain tensioner roller. Push back the chain tensioner assembly until proper tension is achieved, then tighten the socket head cap screw on the chain tensioner.

7. Install front and rear cover plates.

After this procedure, the pressure rollers should be checked and adjusted if necessary (see Pressure Rollers on page 11).

Lead Screw Thread Clearance

Referring to Figure 14 – If adjusting the table height becomes difficult or if excessive clearance forms between the lead screws and bushings, adjustment may be required as described below.

Symptoms

 Table wobble is noted  Difficulty is noted in table height adjustment

Corrective action

1. Determine the corner(s) requiring adjustment.

2. Use a 1/8" hex wrench to loosen the setscrew

(A, Fig. 19) between 1/4 and 1/2 turn.

To remove excessive clearance

Figure 13

3. Using a 1-1/8" wrench, slightly tighten the

eccentric bushing (B) by turning clockwise (from right to left).

For clearance too tight, causing difficulty in table height adjustment

3. Using a 1-1/8" wrench, slightly loosen the

eccentric bushing (B) by turning counterclockwise (from left to right).

After adjustment

4. Tighten the setscrew (A).

After adjusting the lead screw clearance, the table must be rechecked for parallelism (previous section).

Figure 14

Conveyor Belt

Conveyor belt tension and tracking adjustments may occasionally be necessary during break-in and normal operation to compensate for belt stretching. Adjust the tension of the conveyor belt by turning the knobs (Fig. 15) clockwise to increase tension, counterclockwise to decrease tension. The belt should have just enough tension to move the material without slipping on the drive roller.

Do not over tighten the conveyor belt. Excessive tension will cause stretching and premature wear of the belt.

After tensioning the belt, turn on the machine and run the conveyor in the forward direction at the fastest speed setting. Watch for a tendency of the conveyor belt to drift to one side of the conveyor. If this happens, correct as follows:

1. On the side of the conveyor toward which the

belt is drifting, tighten the knob 1/4 turn (Fig. 15) to shift the belt to the opposite direction.

2. On the side of the conveyor away from which

the belt is drifting, loosen the knob.

Figure 15

3. After adjusting each take-up knob, allow time

for the belt to react to the adjustments before proceeding further. Continue this adjustment until the conveyor belt is tracking properly in the center of the table. Try to avoid overadjustments.

Drive Belts

Check the tension of the drive belts by squeezing the belts together in the middle (between the motor and drum pulleys as shown in Fig. 16) with moderate pressure. They are properly tensioned when there is approximately 1/4” deflection.

If adjustment is necessary, loosen the hex nuts (Fig. 17) and raise or lower the motor plate as needed. (For example, to lower the motor plate and increase tension, loosen the bottom nuts and tighten the top nuts.) When finished, tighten the nuts.

If replacing the belts, always replace them in matched sets of the proper size.

Figure 16

Figure 17

Pulley Alignment

The drum and motor pulleys must be in line so that the belts are straight. To check this:

Place a straight edge, such as a metal ruler, against the flat sides of the motor pulley and a drum pulley (Fig. 18).

If the straight edge does not lie flush on the flat sides of the pulleys, loosen the set screw on the motor pulley (Fig. 17).

Move the motor pulley on the shaft until the straight edge lies flush on both pulleys.

Tighten the set screw.

Changing Belts

The drums are heavy – use an assistant to change belts.

Adjust the motor to allow slack in the belts, and remove the two belts from around the motor pulley. Belts should always be replaced as a matched set.

Remove the four bolts holding the front drum to the sides of the cabinet, and lift the front drum out of the machine.

On the rear drum, loosen the two bolts at the right side of the drum, but do not remove them. Completely remove the two bolts that hold the left side of the drum to the cabinet, and shift the drum toward the right side. The left end of the drum should come clear of the cabinet.

Remove the old belts and place the new belts around the drum pulley. Reinsert the two bolts at the left end of the drum and tighten firmly.

Retighten the two bolts at the right side of the drum.

Check and adjust the tension of the new belts before operating.

Figure 18

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