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RULES FOR SAFE OPERATION

15. DO NOT FORCE EQUIPMENT:

Equipment will perform best at the rate for which it was designed.

Excessive force only causes operator fatigue, increased wear and reduced control.

16. KEEP HANDS AWAY FROM ALL MOVING PARTS.

17. WEAR GLOVES WHEN CHANGING ACCESSORIES.

18. DO NOT ABUSE CORD:

Never unplug by yanking the cord from the outlet. Pull plug rather than cord

to reduce the risk of damage. Keep the cord away from heat, oil, sharp objects, cutting edges and
moving parts.

19. DO NOT OVERREACH. MAINTAIN CONTROL:

Keep proper footing and balance at all times.

Maintain a firm grip.

20. STAY ALERT:

Watch what you are doing, and use common sense. Do not use when you are tired,

distracted or under the influence of drugs, alcohol or any medication causing decreased control.

21. STARTING MACHINE:

On/off switch must be in off position before connecting to power source.

22. UNPLUG EQUIPMENT:

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 oil and grease. Keep

cutting edges sharp and clean. Follow instructions for lubricating and changing accessories.
Periodically inspect tool cords and extension cords for damage. Have damaged parts repaired 
or replaced.

24. STORE IDLE EQUIPMENT:

When not in use, store in a dry, secured place. Keep away

from children.

25. MAINTAIN LABELS AND NAMEPLATES:

These carry important information. If unreadable or

missing, contact National for a free replacement.

26. MACHINE IS HEAVY, DO NOT DROP:

Counter weights are heavy. Take caution when removing 

or reassembling. Take caution when moving or transporting.

WARNING:

Exposure to dust may cause respiratory ailments. Use approved NIOSH or OSHA

respirators, safety glasses or face shields, gloves and protective clothing. Provide adequate ventilation
to eliminate dust, or to maintain dust level below the Threshold Limit Value for nuisance dust as
classified by OSHA.

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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