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For technical questions, please call 1-800-444-3353.

SKU 68739

Initial Tool Set Up/Assembly

  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 the 

Assembly Diagram near the end of this manual.

Note:

  This air tool may be shipped with a protective plug 

covering the air inlet.  Remove this plug before set up.

Air Supply

TO PREVENT SERIOUS INJURY 

FROM EXPLOSION: 

Use only clean, dry, regulated, compressed 

air to power this tool.  Do not use oxygen, 

carbon dioxide, combustible gases, or any other 

bottled gas as a power source for this tool.

1.  Incorporate a filter, regulator with pressure gauge, 

oiler, in-line shutoff valve, and quick coupler for 

best service, as shown on Figure B on page 8 

and Figure C on page 9. 

 An in-line shutoff 

ball valve is an important safety device because 

it controls the air supply even if the air hose 

is ruptured.  The shutoff valve should be a 

ball valve because it can be closed quickly.

Note: 

If an automatic oiler system is not used, 

add a few drops of Pneumatic Tool Oil to the 

airline connection before operation.  Add a few 

more drops after each hour of continual use.

2.  Attach an air hose to the compressor’s air outlet.  

Connect the air hose to the air inlet of the tool.  

Other components, such as a quick connect 

plug and quick connect coupler, will make 

operation more efficient, but are not required.

WARNING!  TO PREVENT SERIOUS INJURY 

FROM ACCIDENTAL OPERATION: 

Do not install a female quick coupler on the tool.

  

Such a coupler contains an air valve that will 

allow the air tool to retain pressure and operate 

accidentally after the air supply is disconnected.

Note: 

Air flow, and therefore tool performance, can 

be hindered by undersized air supply components.  

The air hose must be long enough to reach 

the work area with enough extra length to 

allow free movement while working.

3.  Release the Trigger.

4.  Turn on the air compressor according to 

the manufacturer’s directions and allow it 

to build up pressure until it cycles off.

5.  Adjust the air compressor’s output regulator so 

that the air output is enough to properly power 

the tool, but the output will not exceed the tool’s 

maximum air pressure at any time.  Adjust 

the pressure gradually, while checking the air 

output gauge to set the right pressure range.

6.  Inspect the air connections for leaks.  

Repair any leaks found.

7.  If the tool will not be used at this time, turn off 

and detach the air supply, safely discharge 

any residual air pressure, and release the 

trigger to prevent accidental operation.

Note:

  Residual air pressure should not be present 

after the tool is disconnected from the air supply.  

However, it is a good safety measure to attempt to 

discharge the tool in a safe fashion after disconnecting 

to ensure that the tool is disconnected and unpowered.

Summary of Contents for 68739

Page 1: ...ible Visit our website at http www harborfreight com Copyright 2011 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 manual may not be drawn proportionally Due to continuing improvements actual product may differ slightly from ...

Page 2: ...asic precautions should always be followed including the following General a To reduce the risks of electric shock fire and injury to persons read all the instructions before using the tool Work Area a Keep the work area clean and well lighted Cluttered benches and dark areas increase the risks of electric shock fire and injury to persons b Do not operate the tool in explosive atmospheres such as ...

Page 3: ...t of reach of children and other untrained persons A tool is dangerous in the hands of untrained users f Maintain the tool with care Keep a cutting tool sharp and clean A properly maintained tool with sharp cutting edges reduces the risk of binding and is easier to control g Check for misalignment or binding of moving parts breakage of parts and any other condition that affects the tool s operatio...

Page 4: ... harm Some examples of these chemicals are Lead from lead based paints Crystalline silica from bricks and cement or other masonry products Arsenic and chromium from chemically treated lumber Your risk from these exposures 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 t...

Page 5: ... hand past hand injuries nervous system disorders diabetes or Raynaud s Disease should not use this tool If you feel any symptoms related to vibration such as tingling numbness and white or blue fingers seek medical advice as soon as possible 2 Do not smoke during use Nicotine reduces the blood supply to the hands and fingers increasing the risk of vibration related injury 3 Wear suitable gloves t...

Page 6: ...t 1 4 18 NPT Maximum Speed 18 000 RPM Average Air Consumption 4 CFM 90 PSI Pad Capacity 7 8 arbor x 5 Maximum speed at stated maximum air pressure Excess air pressure is hazardous and may cause the tool to exceed stated maximum speed Air Inlet 7 Air Regulator 6 Pad 22a b c Arbor Nut 23 Trigger 12 Figure A Components and Controls Spindle Ring 21 ...

Page 7: ...ose to the air inlet of the tool Other components such as a quick connect plug and quick connect coupler will make operation more efficient but are not required WARNING TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION Do not install a female quick coupler on the tool Such a coupler contains an air valve that will allow the air tool to retain pressure and operate accidentally after the air suppl...

Page 8: ...r to tool B Filter Prevents dirt and condensation from damaging tool or work piece C Regulator Adjusts air pressure to tool D Lubricator optional For air tool lubrication E Coupler and Plug Provides quick connection and release F Leader Hose optional Increases coupler life G Air Cleaner Dryer optional Prevents water vapor from damaging work piece H Air Adjusting Valve optional For fine tuning airf...

Page 9: ...E Main Air Line 3 4 minimum recommended Distributes air to branch lines F Ball Valve To drain moisture from system G Branch Air Line 1 2 minimum recommended Brings air to point of use H Air Hose Connects air to tool I Filter Prevents dirt and condensation from damaging tool or work piece J Regulator Adjusts air pressure to tool K Lubricator optional For air tool lubrication L Coupler and Plug Prov...

Page 10: ...no safety shield TO PREVENT SERIOUS INJURY All accessories must be rated at or above 18 000 RPM 1 Insert the Spindle Lock Pin 24 into the hole on the Spindle Ring 21 See Figure D Spindle Lock Pin 24 Spindle Ring 21 Figure D Installing the Pad Pad 22a b c Arbor Nut 23 2 Place the desired Pad 22a b c onto the Spindle Ring Apply a sandpaper disc of the same size to the Pad with the rough side facing ...

Page 11: ...ss the surface for best results 5 If the tool requires more force to accomplish the task verify that the tool receives sufficient unobstructed airflow CFM and increase the pressure PSI output of the regulator up to the maximum air pressure rating of this tool CAUTION TO PREVENT INJURY FROM TOOL OR ACCESSORY FAILURE Do not exceed the tool s maximum air pressure rating If the tool still does not hav...

Page 12: ...fore further use TO PREVENT SEROUS INJURY FROM EXPLOSION Lubricate the tool only with specified lubricants Lubricate the air inlet using only pneumatic tool oil Other lubricants may damage the mechanism and may be highly flammable causing an explosion Cleaning Maintenance and Lubrication Note These procedures are in addition to the regular checks and maintenance explained as part of the regular op...

Page 13: ... Have qualified technician clean and lubricate mechanism Install in line filter in air supply as stated in Initial Set Up Air Supply Housing heats during use 1 Incorrect lubrication or not enough lubrication 2 Worn parts 1 Lubricate using air tool oil according to directions 2 Have qualified technician inspect internal mechanism and replace parts as needed Severe air leakage Slight air leakage is ...

Page 14: ... THE MANUFACTURER OR DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT IN FACT THE MANUFACTURER AND OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS AND NOT BY THE ...

Page 15: ...Page 15 For technical questions please call 1 800 444 3353 SKU 68739 Assembly Diagram ...

Page 16: ... 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 and...

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