DUAL-HEAD

DRYWALL SANDER

Replacement sandpaper available at

wenproducts.com

Model # 6377

bit.ly/wenvideo

IMPORTANT:

Your new tool has been engineered and manufactured to WEN’s highest standards for dependability, ease of operation, and operator safety. When properly cared for, this product will supply you years of rugged, trouble-free performance. Pay close attention to the rules for safe operation, warnings, and cautions. If you use your tool properly and for intended purpose, you will enjoy years of safe, reliable service.

NEED HELP? CONTACT US!

Have product questions? Need technical support?

Please feel free to contact us at:

800-232-1195

(M-F 8AM-5PM CST)

[email protected]

WENPRODUCTS.COM

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TABLE OF CONTENTS

Technical Data

General Safety Rules

Electrical Information

Know Your Drywall Sander

Specific Safety Rules For the Drywall Sander

Assembly

Operation

Maintenance

Troubleshooting

Exploded View and Parts List

Warranty

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TECHNICAL DATA

Model Number:

Motor:

Speed:

Triangular Pad Size (along one edge):

Triangular Sandpaper Size (along one edge):

Triangular Sandpaper Model Number:

Round Pad Diameter:

Round Sandpaper Diameter:

Round Sandpaper Model Number:

6377

120 V, 60 Hz, 5A

600 to 1500 RPM (no load)

11-1/4 inch

11-1/4 inch

6377SP

8-1/2 inch

9 inch

6369SP

Sanding Pad Grits:

Tube Diameter:

Net Weight:

60, 80, 120, 150, 180, 240

1-1/4 inch

17.4 pounds

GENERAL SAFETY RULES

Safety is a combination of common sense, staying alert and knowing how your item works.

SAVE THESE SAFETY INSTRUCTIONS.

WARNING:

To avoid mistakes and serious injury, do not plug in your tool until the following steps have been read and understood.

1. READ and become familiar with this entire instruction manual. LEARN the tool’s applications, limitations, and possible hazards.

AVOID DANGEROUS CONDITIONS

2. DO NOT use power tools in wet or damp areas or expose them to rain.

3. DO NOT use power tools in the presence of flammable liquids or gases.

4. ALWAYS keep your work area clean, uncluttered, and well lit. DO NOT work on floor surfaces that are slippery with sawdust or wax.

5. CHILDPROOF THE WORKSHOP. Use padlocks and master switches and ALWAYS remove starter keys on all tools.

6. KEEP BYSTANDERS AT A SAFE DISTANCE from the work area, especially when the tool is operating.

NEVER allow children or pets near the tool.

DRESS FOR SAFETY

7. DO NOT wear loose clothing, gloves, neckties, or jewelry (rings, watches, etc.) When operating the tool. Inappropriate clothing and items can get caught in moving parts and draw you in. ALWAYS wear non-slip footwear and tie back long hair.

8. USE SAFETY GOGGLES AT ALL TIMES that comply with ANSI Z87.1. Normal safety glasses only have impact resistant lenses and are not designed for safety. Use ear protection such as plugs or muffs during extended periods of operation.

9. WEAR A FACE MASK OR DUST MASK to fight the dust produced by sanding operations.

WARNING:

Dust generated from certain materials can be hazardous to your health. Always operate the tool in a well-ventilated area and provide for proper dust removal. Use dust collection systems whenever possible.

OPERATE WITH PRECAUTIONS

10. STAY ALERT. A moments of inattention when operating power tools may result in serious personal injury.

DO NOT operate the tool if you are tired or under the influence of drugs, alcohol, or medication that may affect your ability to properly use the tool.

11. CHECK FOR DAMAGED PARTS. Check for alignment of moving parts, jamming, breakage, improper mounting, or any other conditions that may affect the tool’s operation. Any part that is damaged should be properly repaired or replaced before use.

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GENERAL SAFETY RULES

12. AVOID ACCIDENTAL START-UPS. Make sure the power switch is in the OFF position before plugging in the power cord.

13. REMOVE ADJUSTMENT TOOLS. Always make sure all adjustment tools are removed from the saw before turning it on.

14. DO NOT FORCE THE TOOL to do a job for which it was not designed.

15. KEEP GUARDS IN PLACE AND IN WORKING ORDER.

16. DO NOT OVERREACH. Keep proper footing and balance at all times. Wear oil-resistant rubber-soled footwear. Keep the floor clear of oil, scrap, and other debris.

17. NEVER LEAVE A RUNNING TOOL UNATTENDED. Turn the power switch to OFF. Do not leave the tool until it has come to a complete stop.

18. NEVER STAND ON A TOOL. Serious injury could result if the tool tips or is accidentally hit. DO NOT store anything above or near the tool.

19. ALWAYS remove the power cord plug from the electrical outlet when making adjustments, changing parts, cleaning, or working on the tool.

20. MAINTAIN TOOLS PROPERLY. ALWAYS keep tools clean and in good working order. Follow instructions for lubricating and changing accessories.

ELECTRICAL INFORMATION

Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy enough to carry the current your product will draw. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. The table below shows the correct size to be used according to cord length and nameplate ampere rating. When in doubt, use a heavier cord. The smaller the gauge number, the heavier the cord.

Make sure your extension cord is properly wired and in good condition. Always replace a damaged extension cord or have it repaired by a qualified person before using it. Protect your extension cords from sharp objects, excessive heat and damp/wet areas.

AMPERAGE

5 A

REQUIRED GAUGE FOR EXTENSION CORDS

25 ft.

18 gauge

50 ft.

16 gauge

100 ft.

16 gauge

150 ft.

14 gauge

Use a separate electrical circuit for your tools. This circuit must not be less than a #12 wire and should be protected with a 15 A time-delayed fuse. Before connecting the motor to the power line, make sure the switch is in the OFF position and the electric current is rated the same as the current stamped on the motor nameplate. Running at a lower voltage will damage the motor.

WARNING:

This tool must be grounded while in use to protect the operator from electric shock.

KNOW YOUR DRYWALL SANDER

Hose Connection Port

Hook & Loop

Round Base Pad

Power Switch

Variable Speed

Adjustment Wheel

Handle

Extension

Connection

Adapter

Locking

Clasp

Motor

Hook & Loop

Triangular Base Pad

SPECIFIC RULES FOR THE DRYWALL SANDER

1. Do not force the machine to do a job that is not intended such as rough grinding, brushing, etc.

2. Only use one extension tube when operating the tool.

3. Always hold your tool firmly to avoid kick back from torque on initial start up.

4. Do not put down the machine until the pad’s rotation has completely stopped.

5. Only use identical replacement parts when servicing the drywall sander.

6. Do not use sanding discs larger than the recommended size (11-1/4 in. for triangular disk and 9 in. for round disk)

7. Accessories need to be rated at a minimum of 1500 RPM. Do not use accessories rated at speeds below the machine’s maximum RPM.

8. Never use damaged accessories. Always check whether accessories are nicked or cracked prior to operation; in particular, the grinding pad support plate. RUN THE MACHINE AT MAXIMUM SPEED FOR ONE MINUTE in order to test accessories before using them to sand anything. Make sure bystanders stand clear during this testing phase.

9. Regularly clean your machine’s exhaust/dust port.

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ASSEMBLY

WARNING:

DO NOT attempt to plug in or operate this tool until it is completely assembled and installed according to the instructions.

1. Unfold the front and back of the drywall sander. Push the clasp fully into the closed position (Fig. A).

2. Attach the base pad. The shaft cap on the back of the base pad(Fig. B - 1) needs to match the hole alignment on the drywall sander head (Fig. B - 2) to be installed.

Use the included spanner to adjust the angle of the shaft cap. Then press the er. The shaft cap on the round base pad can also be rotated by hand.

3. Pull the knob (Fig. C - 1) on the side of the head and slide it upward to secure the base pad in place. Check to make sure the base pad is securely aligned and attached.

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Fig. A

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2

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1 choice to the face of the hook and loop base pad. Ensure the holes are aligned on the bottom of the pad (Fig. D).

Fig. C

5. Attach the optional handle extension. Rotate the locking nut (Fig. E - 1) counterclockwise to loosen it. Insert the extension tube with the connection adapter (Fig. E

- 2) into the main drywall sander. Slide the extension tube to the ideal length.

NOTE: the connection adapter (Fig. E - 2) cannot be below the maximum length indication line on the extension tube (Fig. E - 3), otherwise the handle extension will not be tightened. Rotate the locking nut clockwise to lock the handle extension in place. Check that the handle extension is securely attached.

D drywall sander assembly if you choose not to use the handle extension.

NOTE: A dust collection device is recommended to cut down on mess and the potentially harmful particulates in the air produced from sanding.

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7. Connect one end of the dust hose to the end of the hose connection port and the other to the dust extraction device of your choice.

Max

Fig. B

Fig. D

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2

1

Fig. E

C

6

B

A

8

7

6

5

4

3

2

1

F

E

D

C

5

UNLESS OTHERWISE SPECIFIED:

DIMENSIONS ARE IN MILLIMETERS

SURFACE FINISH:

TOLERANCES:

LINEAR:

ANGULAR:

NAME

FINISH:

SIGNATURE

DRAWN

CHK'D

APPV'D

MFG

Q.A

DATE

MATERIAL:

4

WEIGHT:

3

B

DEBURR AND

BREAK SHARP

EDGES

DO NOT SCALE DRAWING

REVISION

TITLE:

DWG NO.

6377 extension insert

SCALE:1:20

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SHEET 1 OF 1

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A

OPERATION

WARNING:

This tool is for indoor use only.

DO NOT expose to rain or use in damp locations

1. Hold the machine firmly with both hands. DO NOT hold the machine by the machine’s head to avoid injury.

3. Before operation, make sure every fastener and nut has been properly engaged and that the sanding pad has been properly installed and aligned.

4. Before switching on the machine, keep the sanding head slightly away from the work surface.

VARIABLE SPEED CONTROL

Use the speed wheel (Fig. F - 1) to adjust anywhere from 600 to

1500 RPM. This drywall sander is equipped with constant speed control to keep the pad running at a consistent rate despite changes in applied load.

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TURNING ON THE DRYWALL SANDER

After setting the variable speed to your desired RPM, power the machine by pressing forward on the power switch (Fig. F - 2).

Fig. F

5. During sanding operation, do not press down too hard in order to avoid overloading the sander. Use proper pressure for better sanding effects. If the machine slows or bogs down, immediately lessen the applied pressure.

The quality of the results are mainly determined by choosing the right abrasive material for the job.

6. Once the sanding task has been completed, turn off the machine. Wait for the pad to stop rotating before setting down the machine.

WARNING:

To avoid injury from accidental startups,

ALWAYS TURN SWITCH OFF AND REMOVE THE PLUG from the power source outlet before making any adjustments

MAINTENANCE

CLEANING AND MAINTAINING YOUR DRYWALL SANDER

Clean the unit immediately after using it. Regularly clean the unit with a damp cloth and a little soft soap. Do not use cleaners or solvents as they will attack the plastic of the unit. Make sure water does not get into the unit.

Your drywall sander requires no additional lubrication or maintenance. Always store your sander in a dry place away from children.

If the supply cord is damaged, it must be replaced by the manufacturer or a similarly qualified technician.

DO NOT USE A DAMAGED TOOL.. If excessive sparking occurs, have the carbon brushes checked by a qualified electrician. Only a qualified technician should change the carbon brushes.

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MAINTENANCE

REPLACING THE SHAFT CAP

The plastic shaft cap on the back of the triangular base pad (Fig. G

- 1) and the round base pad is a consumable item that needs to be routinely replaced. Spare caps are included on the back of the triangular pad (Fig. G - 2). Use the spanner to remove the worn shaft cap and replace with a new cap.

Adjust the angle of the shaft cap with a spanner to match the hole alignment (Fig. B) before attaching it back onto the drywall sander.

REPLACING THE SANDING PAD

First, detach the sanding disc from the sanding pad.

FOR TRIANGULAR SANDING PAD:

Unscrew the three screws (Fig. H - 1) located on the outer corners of the sanding pad and the three screws (Fig. H - 2) on the flange.

Replace the pad with an identical part suited for this particular model of drywall sander. Attach firmly in place with the screws.

FOR ROUND SANDING PAD:

Insert the hex wrench into the hexagonal screw (Fig. I - 1) located in the center of the hook and loop sanding pad. Hold the pad firmly while turning the wrench to unscrew the center hex screw. Replace the pad with an identical part suited for this particular model of drywall sander. Attach firmly in place using the hexagonal screw.

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2

Fig. G

2 1

Fig. H

1

Fig. I

TROUBLESHOOTING

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PROBLEM

Motor is not working.

CAUSE

1) Wires in the main plug or in the socket are loose.

2) The switch is faulty.

Unusual noises occur during operation. Motor is not working properly.

1) Switch contact has failed.

2) Components have jammed.

3) Too high of load has been applied.

Motor gets hot. 1) Foreign substances have gotten inside the motor.

2) Too high of load has been applied.

Frequent sparks occur on the commutator.

1) There is a short circuit in the motor

(armature).

2) Carbon brushes are worn out or jammed.

SOLUTION

1) Have the socket and plug checked by an authorized technician.

2) Have the switch replaced by an authorized technician.

1) Have the switch replaced by an authorized technician.

2) Have the tool checked and repaired.

3) Use less pressure during sanding operations.

1) Have the foreign substances removed.

2) Use less pressure during sanding operations.

1) Have the armature replaced.

2) Have the carbon brushes checked.

EXPLODED VIEW AND PARTS LIST

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EXPLODED VIEW AND PARTS LIST

126

127

128

129

121

123

124

125

No.

Part Number

1-8 6377-015A

9 6377-009

10 6377-015A

11-14 6377-012A

15 6377-015A

16-32 6377-031A

33 6377-033

34-38 6377-031A

39

40

6377-039

6377-041A

41 6377-041

42-46 6377-041A

47 6377-047

116

117

118

119

112

113

114

115

48-67 6377-041A

67A 6377-067A

68

69

6377-041A

6377-080A

70 6377-070

71-109 6377-080A

110

111

6369-054

6369-055

6369-056

6369-057

6369-058

6369-046

6369-059

6369-060

6369-061

6369-062

6369-066

6369-068

6369-069

6369-070

6377-163

6369-071

6369-072

6369-073

Part Description

Gearbox Assembly

Locking Shaft

Gearbox Assembly

Dust Collection Assembly

Gear Box

Motor Assembly

Carbon Brush (Set of 2)

Motor Assembly

Screw M6 x 14

Circular Head Assembly

Circular Sanding Pad

Circular Head Assembly

Screw M4x12

Circular Head Assembly

Shaft Cap

Circular Head Assembly

Triangular Head Assembly

Traingular Sanding Pad

Triangular Head Assembly

Tightening Ring 25-38

350 Hose

Small Cable Sleeve

Small Rubber Cover

Right Handle Stand

Screw M4x14

Ø28 Connector

Plastic Soft Pipe Ø28

Ellipticle Connector

Left Handle Stand

Cable Plate

Electronic Speed Control Plate

Potentiometer

Speed Button

Inner Wire

Cable

Cable Sleeve

Left Main Handle

155

156

157

158

151

152

153

154

147

148

149

150

143

144

145

146

163

164

166

167

159

160

161

162

136

137

138

139

140

141

142

No.

Part Number

130

131

6369-074

6369-075

132

133

134

135

6369-076

6369-077

6369-078

6369-079

6369-080

6369-081

6369-082

6369-083

6369-087

6369-088

6369-089

6377-159

6377-160

6377-161

6377-162

6377-163

6369-102

6369-103

6377-167

Part Description

Aluminum Pipe Insert

Cable Pressing Plate

Left Sub-Handle

Aluminum Pipe

Back Hinge Sleeve

Ø5x45 Pin

Ø5 Clinch Bolt

Ø1.2 Sealed Ring

Front Hinge Sleeve

Aluminum Pipe

Sleeve 2#

Front Latch

Spring

6369-090

6369-091

6369-084

6369-085

Latch Pivot

Fixed Plate

Supporting Arm

Ø5x30 Pin

6369-086 Ø5x16.8 Pin

6369-092 Aluminum Pipe With Single Access

6369-093

6369-094

Switch

Switch Pushing Lever

6369-095

6369-096

6369-097

6369-098

6369-099

6369-100

6369-101

6377-158

Switch Button

Right Sub-Handle

Circular Pin Ø1.5x11.8

Back Screw Nut

Right Main Handle

Hose Connection Adapter

Adjustable Ring

Buckle

Copper Strips

3 Tooth Buckle

Y Buckle

Heat Shrink Tubing

Inner Wire

Connection Adapter

Dust Tube

Wrench

LIMITED TWO YEAR WARRANTY

WEN Products is committed to build tools that are dependable for years. Our warranties are consistent with this commitment and our dedication to quality.

LIMITED WARRANTY OF WEN CONSUMER POWER TOOLS PRODUCTS FOR HOME USE

GREAT LAKES TECHNOLOGIES, LLC (“Seller”) warrants to the original purchaser only, that all WEN consumer power tools will be free from defects in material or workmanship for a period of two (2) years from date of purchase. Ninety days for all WEN products, if the tool is used for professional use.

SELLER’S SOLE OBLIGATION AND YOUR EXCLUSIVE REMEDY under this Limited Warranty and, to the extent permitted by law, any warranty or condition implied by law, shall be the repair or replacement of parts, without charge, which are defective in material or workmanship and which have not been misused, carelessly handled, or misrepaired by persons other than Seller or Authorized Service Center. To make a claim under this

Limited Warranty, you must make sure to keep a copy of your proof of purchase that clearly defines the Date of

Purchase (month and year) and the Place of Purchase. Place of purchase must be a direct vendor of Great Lakes

Technologies, LLC. Third party vendors such as garage sales, pawn shops, resale shops, or any other secondhand merchant void the warranty included with this product. Contact [email protected] or 1-800-232-

1195 to make arrangements for repairs and transportation.

When returning a product for warranty service, the shipping charges must be prepaid by the purchaser. The product must be shipped in its original container (or an equivalent), properly packed to withstand the hazards of shipment. The product must be fully insured with a copy of the warranty card and/or the proof of purchase enclosed.

There must also be a description of the problem in order to help our repairs department diagnose and fix the issue. Repairs will be made and the product will be returned and shipped back to the purchaser at no charge.

THIS LIMITED WARRANTY DOES NOT APPLY TO ACCESSORY ITEMS THAT WEAR OUT FROM

REGULAR USAGE OVER TIME INCLUDING BELTS, BRUSHES, BLADES, ETC.

ANY IMPLIED WARRANTIES SHALL BE LIMITED IN DURATION TO ONE (1) YEAR FROM DATE

OF PURCHASE. SOME STATES IN THE U.S., SOME CANADIAN PROVINCES DO NOT ALLOW

LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION

MAY NOT APPLY TO YOU.

IN NO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAM-

AGES (INCLUDING BUT NOT LIMITED TO LIABILITY FOR LOSS OF PROFITS) ARISING FROM

THE SALE OR USE OF THIS PRODUCT. SOME STATES IN THE U.S. AND SOME CANADIAN

PROVINCES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CON-

SEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO

YOU.

THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE

OTHER RIGHTS WHICH VARY FROM STATE TO STATE IN THE U.S., PROVINCE TO PROVINCE

IN CANADA AND FROM COUNTRY TO COUNTRY.

THIS LIMITED WARRANTY APPLIES ONLY TO PORTABLE ELECTRIC TOOLS, BENCH POW-

ER TOOLS, OUTDOOR POWER EQUIPMENT AND PNEUMATIC TOOLS SOLD WITHIN THE

UNITED STATES OF AMERICA, CANADA AND THE COMMONWEALTH OF PUERTO RICO. FOR

WARRANTY COVERAGE WITHIN OTHER COUNTRIES, CONTACT THE WEN CUSTOMER SUP-

PORT LINE.

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THANKS FOR REMEMBERING