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Page 11

For technical questions, please call 1-888-866-5797.

Item 64754 64756 
        

Sa

F

ety

Opera

ti

O

n

Maintenance

Setup

Maintenance and Servicing instructions

  procedures not specifically explained in this manual must 

be performed only by a qualified technician.

tO preVent SeriOuS inJury FrOM acciDentaL OperatiOn: 
Make sure that the trigger is in the off-position and remove its Battery 
pack before performing any procedure in this section.

tO preVent SeriOuS inJury FrOM tOOL FaiLure: 
Do not use damaged equipment.  if abnormal noise or vibration 
occurs, have the problem corrected before further use.

cleaning, Maintenance, and Lubrication

1� 

BeFOre eacH uSe,

 inspect the general 

condition of the Tool�  Check for:
•  leaking, swollen, or cracked Battery Pack
•  loose hardware
•  misalignment or binding of moving parts
•  cracked or broken parts 
•  any other condition that may 

affect its safe operation�

2� 

aFter uSe,

 wipe external surfaces 

of the Tool with clean cloth�

3�  Li-Ion BATTERY MUST BE RECYCLED OR 

DISPOSED OF PROPERLY�   
Do not short, incinerate or open battery�

4�  Disconnect Battery Pack and store Battery Pack, 

Charger, and Tool in dry, indoor area out of 
reach of children and away from metal objects 
(i�e�, paperclips, coins) to prevent shorting�

troubleshooting

problem

possible causes

Likely Solutions

Tool will not start�

1�  Battery Pack not properly 

connected� 
 

2�  Battery Pack not properly 

charged� 

3�  Battery Pack burnt-out� 

4�  Internal damage or wear�  (Carbon 

brushes or Trigger, for example�)

1�  Remove Battery Pack, make sure there are no 

obstructions, reinsert the Battery Pack according 
to its shape (it should only fit one way), and press 
firmly until the Battery Pack locks in place�

2�  Make sure Charger is connected and 

operating properly�  Give enough time for 
Battery Pack to recharge properly�

3�  Dispose of old Battery Pack properly or recycle�  

Replace Battery Pack�

4�  Have technician service tool�

Tool operates slowly�

1�  Forcing tool to work too fast�
2�  Battery Pack wearing out�

1�  Allow tool to work at its own rate�
2�  Dispose of old Battery Pack properly or recycle�  

Replace Battery Pack�

Performance 
decreases over time�

1�  Carbon brushes worn 

or damaged�

2�  Bit dull or damaged�

1�  Have qualified technician replace brushes� 

2�  Keep bits sharp�  Replace as needed�

Excessive noise 
or rattling�

Internal damage or wear�  (Carbon 
brushes or bearings, for example�)

Have technician service tool�

Overheating�

1�  Forcing tool to work too fast�
2�  Bit dull or damaged�
3�  Blocked motor housing vents� 

 

1�  Allow tool to work at its own rate�
2�  Keep bits sharp�  Replace as needed�
3�  Wear ANSI-approved safety goggles and 

NIOSH-approved dust mask/respirator while 
blowing dust out of motor using compressed air�

  Follow all safety precautions whenever diagnosing or servicing the tool.   

Disconnect Battery pack and charger power supply before service.

Summary of Contents for Hypermax Lithium 1791C-B1

Page 1: ...rence 18i When unpacking make sure that the product is intact and undamaged If any parts are missing or broken please call 1 888 866 5797 as soon as possible Copyright 2018 by Harbor Freight Tools All rights reserved No portion of this manual or any artwork contained herein may be reproduced in any shape or form without the express written consent of Harbor Freight Tools Diagrams within this manua...

Page 2: ...ovided with this power tool Failure to follow all instructions listed below may result in electric shock fire and or serious injury Save all warnings and instructions for future reference The term power tool in the warnings refers to your mains operated corded power tool or battery operated cordless power tool 1 Work area safety a Keep work area clean and well lit Cluttered or dark areas invite ac...

Page 3: ...ure these are connected and properly used Use of dust collection can reduce dust related hazards h Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles A careless action can cause severe injury within a fraction of a second i Only use safety equipment that has been approved by an appropriate standards agency Unapproved safety equ...

Page 4: ... with specifically designated battery packs Use of any other battery packs may create a risk of injury and fire e When battery pack is not in use keep it away from other metal objects like paper clips coins keys nails screws or other small metal objects that can make a connection from one terminal to another Shorting the battery terminals together may cause burns or a fire f under abusive conditio...

Page 5: ...kpiece resulting in personal injury c apply pressure only in direct line with the bit and do not apply excessive pressure Bits can bend causing breakage or loss of control resulting in personal injury 10 Silicosis Safety Measures Masonry drilling on materials such as concrete which contains crystalline silica can cause silicosis a serious lung disease cancer and death To reduce crystalline silica ...

Page 6: ...you are in doubt as to whether the outlet is properly grounded Do not modify the power cord plug provided with the charger Do not use the charger if the power cord or plug is damaged if damaged have it repaired by a service facility before use if the plug will not fit the outlet have a proper outlet installed by a qualified electrician extension cords note Extension cords must not be used with thi...

Page 7: ...00 0 27 200 Chuck Size 1 2 1 2 Setup Before use read the entire iMpOrtant SaFety inFOrMatiOn section at the beginning of this manual including all text under subheadings therein before set up or use of this product note For additional information regarding the parts listed in the following pages refer to Parts List and Diagram on page 12 Functions Direction Switch Work Light Battery trigger chuck ...

Page 8: ...l and or break nOtice use sharp bits Dull bent or damaged bits will cause stress on the tool and or break 1 While holding the ring behind the collar of the Chuck with one hand rotate the collar of the Chuck counterclockwise until the jaws of the drill are opened enough for bit to fit 2 Use a bit designed for the workpiece type Place the desired drill screwdriver bolt or nut bit into the drill betw...

Page 9: ...sert a fully charged Battery Pack making sure that it clicks into place securely 2 Set Direction Switch Forward Push Switch in on right side arrow pointing forward for clockwise rotation reverse Push Switch in on left side arrow pointing backward for counter clockwise rotation trigger Lock Push Switch to the center to lock the Trigger cautiOn Set Direction Switch to center trigger Lock position du...

Page 10: ...g for cutting without overheating the bit 3 When drilling large holes in metal surfaces use a small drill bit at first Then finish with a larger drill bit Be sure to lubricate the bit with oil to improve the drilling action and help increase bit life Drilling in Masonry Model 1792c B1 only 1 Use carbide or specialty bits for masonry drilling and set mode to Hammer Drilling 2 When drilling in walls...

Page 11: ... start 1 Battery Pack not properly connected 2 Battery Pack not properly charged 3 Battery Pack burnt out 4 Internal damage or wear Carbon brushes or Trigger for example 1 Remove Battery Pack make sure there are no obstructions reinsert the Battery Pack according to its shape it should only fit one way and press firmly until the Battery Pack locks in place 2 Make sure Charger is connected and oper...

Page 12: ...r End Cap 1 7 Motor Gear 1 8 Screw 3 9 Motor 1 10 Push Rod 1 11 Selector Button 1 12 Selector Button Spring 1 13 Spring 1 14 Right Housing 1 15 Protective Plate Bracket Assembly 1 16 Switch Assembly 1 17 Battery Pack Assembly 1 18 Transparent Cover 1 19 Belt Clip 1 20 Left Housing 1 21 Charger not shown 1 parts List and Diagram pLeaSe reaD tHe FOLLOWinG careFuLLy THE MANUFACTURER AND OR DISTRIBUTO...

Page 13: ...Page 13 For technical questions please call 1 888 866 5797 Item 64754 64756 SaFety OperatiOn Maintenance Setup assembly Diagram for 1791c B1 ...

Page 14: ...1 part Description Qty 6 29 Planet Carrier 1 6 30 Planet Gear 5 6 31 Spacer 1 6 32 Rear Shell Gear Ring 1 6 33 Gearbox Rear Shell 1 6 34 Screw 4 6 35 Planet Gear Carrier 1 6 36 Planet Gear 5 6 37 Toggle Gear Ring 1 6 38 Toggle Bracket 1 6 39 Inner Gear Ring Side Pin 4 6 40 Planet Gear Carrier 1 6 41 Planet Gear 3 6 42 Gear Ring 1 6 43 Large Spacer 1 6 44 Motor End Cap 1 6 45 Indicator Ring Insert ...

Page 15: ...Page 15 For technical questions please call 1 888 866 5797 Item 64754 64756 SaFety OperatiOn Maintenance Setup assembly Diagram for 1792c B1 ...

Page 16: ...w the exclusion or limitation of incidental or consequential damages so the above limitation of exclusion may not apply to you THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS To take advantage of this warranty the product or part must be returned to us with transportation charges prepaid Proof of purchase date an...

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