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Page 7

RULES FOR SAFE OPERATION

EXTENSION CORDS

Grounded tools require a three wire extension cord. Double insulated tools can use either a two or three
wire extension cord. As the distance from the supply outlet increases, you must use a heavier gauge
extension cord. Using extension cords with inadequately sized wire causes a serious drop in voltage,
resulting in loss of power and possible tool damage.

The smaller the gauge number of the wire, the greater the capacity of the cord. For example, a 14 gauge
cord can carry a higher current than a 16 gauge cord. When using more than one extension cord to make
up the total length, be sure each cord contains at least the minimum wire size required. If you are using
one extension cord for more than one tool, add the nameplate amperes and use the sum to determine the
required minimum wire size.

GUIDELINES FOR USING EXTENSION CORDS

• If you are using an extension cord outdoors, make sure it is marked with the suffix “W-A” (“W” in

Canada) to indicate that it is acceptable for outdoor use.

• Be sure your extension cord is properly wired and in good electrical 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 or wet areas.

• Keep away from water. Do not use if wet.

• Inspect thoroughly before each use. DO NOT USE IF DAMAGED.

• Make sure equipment is OFF before connecting cord outlet.

• FULLY INSERT plug into outlet.

• Do not remove, bend or modify any metal prongs or pins of cord.

• Do not use excessive force to make connections.

• Do not connect a three prong plug to a two-hole cord. 

• Avoid overheating. Uncoil cord and do not cover it with any material.

• Do not walk on cord.

• Do not drive, drag or place objects over cord.

READ AND SAVE ALL INSTRUCTIONS FOR FUTURE REFERENCE.

WARNING:

Electrical cords can be hazardous. Misuse can result in fire or death by electrical

shock. Read carefully and follow all directions.

Summary of Contents for 3390

Page 1: ...nual Before Operating Machine 9250 XYLON AVENUE NORTH MINNEAPOLIS MN 55445 U S A 800 245 0267 763 535 8206 FAX 763 535 8255 FAX 800 648 7124 WEB SITE www nationalequipment com E MAIL info nationalequi...

Page 2: ...7 A Characteristics of a Defensive Driver 5 B SAFETY SITE ASSESSMENT 5 C Grounding 6 D Extension Cords 7 Safety Instructions 8 General Information 9 Features Specifications 10 General Operation 11 15...

Page 3: ...ng the operator and contacting the tool or extension cord Operator should be aware of who is around them and their proximity 9 PROTECT OTHERS IN THE WORK AREA Provide barriers or shields as needed to...

Page 4: ...PMENT When it is not in use unplug tool before changing blades accessories or performing recommended maintenance or when not in use 23 MAINTAIN EQUIPMENT CAREFULLY Keep handles dry clean and free from...

Page 5: ...ent verify the following 1 Work area is clean dry free of debris and machine will clear all obstructions NEVER BLAST A WET FLOOR AND NEVER ALLOW PERSONNEL ELECTRICAL CORDS OR CONNECTIONS TO COME INTO...

Page 6: ...A If the tool should electrically malfunction or break down grounding provides a low resistance path to carry electricity away from the user reducing the risk of electric shock The grounding prong in...

Page 7: ...you are using an extension cord outdoors make sure it is marked with the suffix W A W in Canada to indicate that it is acceptable for outdoor use Be sure your extension cord is properly wired and in g...

Page 8: ...e to equipment or bodily injury Read and understand operators instruction manual and before operating this equipment WARNING Failure to follow any of the above instructions could cause damage to machi...

Page 9: ...ORAGE Prevent rust during storage Store machine upright in a cool dry well ventilated area MAINTENANCE CHECKS According to the conditions and frequency of use scarifiers have to be checked for safe op...

Page 10: ...step Shot sizes range from S 170 to S 390 which can be used in a wide range of applications including small floor areas tight spaces balconies garage floors basements and pool decks Wear parts are int...

Page 11: ...rete dust is sucked into a duct hose which travels from the blast housing to the dust collector After traveling through the duct hose the concrete dust deposited into the dust collector s dust bin SAF...

Page 12: ...leave stray shot in work area as shot is a slip and fall hazard Stepping and falling on steel shot can result in serious injury A well maintained machine is a productive machine If not properly maint...

Page 13: ...ardwiring or circuit breaker changes should be performed by a licensed electrician 9 Before loading shot into machine turn the switch on the 3390 and the dust collector to the ON position for two minu...

Page 14: ...the steel shot used will impact where the hot spot appears in the blast pattern The operator will need to adjust the control cage based upon the size of steel shot utilized WEAR PARTS The 3390 contain...

Page 15: ...sembly to housing Remove control cage assembly Remove arbor nut and blast wheel Check wheel hub for wear replace as necessary Install new blast wheel and arbor nut Attach the control cage assembly pre...

Page 16: ...ge immediately and verify there is adequate clearance between the blast wheel and the control cage 4 3390 is creating excessive wear on liners and blast housing a Adjust control cage so that hot spot...

Page 17: ...ase the travel speed of the 3390 to reduce amount of concrete being removed c If b does not produce an adequate profile make additional passes over the floor surface 9 3390 or dust collector is emitti...

Page 18: ...any products previously manufactured before this manual It is the customer s responsibility to complete the warranty card and mail it to the seller within 10 days from date of purchase If a failure o...

Page 19: ...be the sole and exclusive warranties granted by National and shall be the sole and exclusive remedy available to the purchaser Correction of defects in the manner and for the period of time described...

Page 20: ...ck One Repair Do you wish to be contacted before repairing Yes No Return Contact National if a loaner is needed Return Authorization Number Date Customer Number Purchased From required contact Nationa...

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