Dynabrade 52376, 52379, 52377, 52378, 52380 User Manual
Parts Page Reorder No. PD01•92
Effective October, 2001
1Hp Extension Type 1 Wheel Grinders
Governor Controlled
Air Tool Manual – Safety, Operation and Maintenance
Models:
52376 – 12,000 RPM
3" Dia. x 3/8" x 1/2" Wide
Reinforced Grinding Wheel
52377 – 15,000 RPM
3" Dia. x 3/8" x 1/2" Wide
Reinforced Grinding Wheel
52378 – 18,000 RPM
3" Dia. x 3/8" x 1/2" Wide
Reinforced Grinding Wheel
52379 – 12,000 RPM
4" Dia. x 3/8" x 1/4" Wide
Reinforced Grinding Wheel
52380 – 15,000 RPM
4" Dia. x 3/8" x 1/4" Wide
Reinforced Grinding Wheel
SAFETY LEGEND
G
Read and understand tool manual to reduce risk
of injury to operator, visitors, and tool.
Eye protection must be worn at all times, eye
protection to conform to ANSI Z87.1.
Respiratory protection to be used when exposed
to contaminants that exceed the applicable
threshold limit values required by law.
Practice safety requirements. Work alert,
have proper attire, and do not operate tools under
the influence of alcohol or drugs.
Ear protection to be worn when exposure to sound,
exceeds the limits of applicable Federal, State or
local statues, ordinances and/or regulations.
Air line hazard, pressurized supply lines and flexible
hoses can cause serious injury. Do not use dam-
aged, frayed or deteriorated air hoses and fittings.
Read and understand this tool manual before operating your air tool. Follow all safety rules for the protection of operating personnel as well as adjacent areas. Always operate, inspect and maintain this tool in accordance with the American National Safety
Institute (ANSI) Safety Code for Portable Air Tools – B186.1. For additional safety information, refer to Safety Requirements for the
Use, Care and Protection of Abrasive Wheels – ANSI B7.1, Code of Federal Regulation – CFR 29 Part 1910, European Committee for
Standards (EN) Hand Held Non-Electric Power Tools – Safety Requirements and applicable State and Local Regulations.
SAFETY INSTRUCTIONS
Carefully Read all instructions before operating or servicing any Dynabrade®Abrasive Power Tool.
Products offered by Dynabrade are not to be modified, converted or otherwise altered from the original design without expressed written consent from Dynabrade, Inc.
Tool Intent: Abrasive Extension Type 1 Wheel Grinders are ideal for cleaning metal before welding, grind and smooth weld seams, remove imperfections, smooth surfaces
prior to painting or plating. Ideal for foundries, welding shops, fabrication plants, steel mills and shipyards.
Do Not Use Tool For Anything Other Than Its Intended Applications.
Training: Proper care, maintenance, and storage of your tool and abrasive wheels will maximize performance.
• Employer's Responsibility – Provide operators with safety instructions and training for safe use of tools and accessories.
Accessory Selection:
• Only use reinforced type 1 wheels.
• Abrasive/accessory RPM (speed) rating MUST be approved for AT LEAST the tool RPM rating.
• Before mounting an abrasive wheel or accessory, visually inspect for defects. Do not use defective wheels or accessories.
• Mount only recommended accessories. See back page of manual and Dynabrade catalog.
• Follow tool specifications before choosing size and type of accessory.
• Only use recommended fittings and air line sizes. Air supply hoses and air hose assemblies must have a minimum working pressure rating of 150 PSIG (10 bars, g) or 150
percent of the maximum pressure produced in the system, whichever is higher. (See tool Machine Specifications table.)
OPERATING INSTRUCTIONS
Warning: Always wear eye protection. Operator of tool is responsible for following: accepted eye, face, respiratory, hearing and body protection.
Always use wheel guard. Make sure it is positioned to best protect the operator and make sure it is securely fastened. Wheel guards that have been subject to a
wheel breaking must be replaced.
(Continued on next page)
SAVE THIS DOCUMENT, EDUCATE ALL PERSONNEL
WARNIN
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
To Tool Station
Closed Loop Pipe System
(Sloped in the direction of air flow)
Ball
Valve
Ball
Valve
Filter
Coupler
Regulator
Lubricator
Air Flow
Drain
Valve
Drain
Valve
Air Tool
Air Compressor
and Receiver
Drain Valve
Air Hose
90 PSIG MAX
(6.2 Bar)
Air Flow
Refrigerated
Air Dryer
2
Filter
Regulator
Lubricator
90 PSIG
(6.2 Bar)
OPERATING INSTRUCTIONS (continued)
Caution: Hand, wrist and arm injury may result from repetitive work, motion and overexposure to vibration.
• Keep hand and clothing away from working end of the air tool.
Operation: Be sure that any loose clothing, hair and all jewelry is properly restrained.
• Secure inlet bushing on air tool with a wrench before attempting to install the air fitting to avoid damaging housing assembly.
• Check tool RPM (speed) with tachometer with air pressure set at 90 PSIG while the tool is running. If tool is operating at a higher speed than the RPM marked on the tool
housing, or operating improperly, the tool must be serviced and corrected before use.
Caution: Tool RPM must never exceed abrasive/accessory RPM rating. Check accessory manufacturer for details on maximum operating speed or special
mounting instructions.
• With power source disconnected from air tool, mount type 1 wheel onto spindle. See diagram below for typical mounting assembly.
• Follow recommended procedure from the manufacturer.
• Connect air tool to power source. Be careful NOT to depress throttle lever in the process. Do not expose air tool to inlet pressure above 90 PSIG or (6.2 Bars).
Caution: After installing the accessory, before starting the grinder with an abrasive wheel, it should be tested in an enclosed protective area. The operator must check to make
sure that no one is in the unguarded plane of the wheel rotation. Increase the speed of the tool gradually. The wheel must be run at free speed for at least one
minute before applying the wheel to work. During this time, check the tool for excessive vibration and noise. The cause of unusual vibration and noise must be
determined and corrected before use. DO NOT USE if tool vibration is excessive. Correct cause, and retest to insure safe operation.
• Make sure that work area is uncluttered, and visitors are at a safe range from the tools and debris.
• Use a vise or clamping device to hold work piece firmly in place.
• Do not apply excessive force on tool or apply “rough” treatment to it.
• Always work with a firm footing, posture and proper lighting.
Report to your supervisor any condition of the tool, accessories, or operation you consider unsafe.
Air System
1 DROP/MIN.
10 SCFM
LUBRICATOR SETTING
• Dynabrade Air Power Tools are designed to
operate at 90 PSIG (6.2 Bar/620 kPa) maximum
air pressure at the tool inlet, when the tool is
running. Use recommended regulator to control
air pressure.
• Ideally the air supply should be free from moisture.
Incorporating a refrigerated air dryer after the
compressor and drain valves at each tool station
(as shown) further reduces moisture from
condensation in the air supply.
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TYPE 1 WHEEL MOUNTING
Typical Mounting for Type 1 Wheels
Safety Guard Reinforced Type 1 Wheel
Outer Flange
Spindle Adapter
Blotter
Blotter
Spindle Nut
Driving Flange
• Blotters must cover at least the flange bearing surface as shown.
• A blotter (compressible washer) shall always be used between each
flange and the abrasive wheel surface to ensure uniform distribution
of flange pressure.
• Blotters shall cover the entire flange contact area.
• New blotters shall be used each time a wheel is mounted unless blotters
are affixed to the wheel by the grinding wheel manufacturer.
Maintenance Instructions
Important: A Preventative Maintenance Program is recommended whenever portable power tools are used.
• Use only genuine Dynabrade replacement parts to insure quality. To order replacement parts, specify Model#, Serial# and RPM of your air tool.
• All Dynabrade Rotary Vane air tools must be used with a Filter-Regulator-Lubricator to maintain all warranties. Dynabrade recommends the following:
11411 Air Filter-Regulator-Lubricator (FRL) – Provides accurate air pressure regulation and two stage filtration of water contaminants. Operates 55
SCFM/1,558 LPM @ 90 PSIG with 1/2" NPT female ports.
• Dynabrade recommends one drop of air lube per minute for each 10 SCFM (example: if the tool specification states 40 SCFM, set the drip rate on the
filter-lubricator to 4 drops per minute). Dynabrade Air Lube (P/N 95842: 1 pt 473 ml) is recommended.
Routine Preventative Maintenance: Check free speed of grinder using a tachometer. This governor controlled grinder should be speed checked every 20
hours of use or weekly, whichever occurs more frequently.
• DO NOT disassemble the governor for any reason. Reorder correct speed – governor assembly (See Assembly Breakdown) and recheck free speed of
tool with a tachometer.
• Mineral spirits are recommended when cleaning the tool and parts. Do not clean tool or parts with any solvents or oils containing acids, esters,
ketones, chlorinated hydrocarbons or nitro carbons.
• DO NOT
clean or maintain tools with chemicals that have a low flash point (example: WD-40®).
• A Motor Tune-Up Kit (P/N 96532) is available which includes high wear and medium wear motor parts.
• Air tool labels must be kept legible at all times, if not, reorder label(s) and replace. (See Assembly Breakdown)
• Blow air supply hose out prior to initial use.
• DO
NOT carry tool by air hose or near the tool throttle lever.
• Visually inspect air hoses and fittings for frays, visible damage and signs of deterioration. Replace damaged or worn components.
• Refer to Dynabrade's Warning/Safety Operating Instructions Tag (Reorder No. 95903) for safety information.
After maintenance is performed on tool, add a few drops of Dynabrade Air Lube (P/N 95842) to the air line and start the tool a few times to lubricate air motor.
Check for excessive tool vibration.
Handling and Storage:
• Use of tool rests, hangers and/or balancers is recommended.
• Protect tool inlet from debris (see Notice below).
• DO
NOT carry tool by air hose or near the tool throttle lever.
• Protect type 1 grinding wheels from exposure to water, solvents, high humidity, freezing temperatures and extreme temperature changes.
• DO
NOT USE type 1 grinding wheels that have been dropped or show signs of cracks, nick or other defects.
• Store accessories in protective racks or compartments to prevent damage.
Machine Specifications
(PD01•92)
3
Notice
All Dynabrade motors use the highest quality parts and metals available and are machined to exacting tolerances. The failure of quality pneumatic motors
can most often be traced to an unclean air supply or the lack of lubrication. Air pressure easily forces dirt or water contained in the air supply into motor
bearings causing early failure. It often scores the cylinder walls and the rotor blades resulting in limited efficiency and power. Our warranty obligation is
contingent upon proper use of our tools and cannot apply to equipment which has been subjected to misuse such as unclean air, wet air or a lack of
lubrication during the use of this tool.
One Year Warranty
Following the reasonable assumption that any inherent defect which might prevail in a product will become apparent to the user within one year from the
date of purchase, all equipment of our manufacture is warranted against defects in workmanship and materials under normal use and service. We shall
repair or replace at our factory, any equipment or part thereof which shall, within one year after delivery to the original purchaser, indicate upon our
examination to have been defective. Our obligation is contingent upon proper use of Dynabrade tools in accordance with factory recommendations,
instructions and safety practices. It shall not apply to equipment which has been subject to misuse, negligence, accident or tampering in any way so as to
affect its normal performance. Normally wearable parts such as bearings, contact wheels, rotor blades, etc., are not covered under this warranty.
Model Motor Motor Sound Maximum Air Flow Air Pressure Spindle Weight Length Height
Number HP (W) RPM Level CFM/SCFM (LPM) PSIG (Bars) Thread Pound (kg) Inch (mm) Inch (mm)
52376 1.0 (744) 12,000 82 dB(A) 5/38 (1,076) 90 (6.2) 3/8"-24 male 3.9 (1.8) 14-1/4 (362) 3-1/2 (89)
52377 1.0 (744) 15,000 83 dB(A) 5/39 (1,104) 90 (6.2) 3/8"-24 male 3.9 (1.8) 14-1/4 (362) 3-1/2 (89)
52378 1.0 (744) 18,000 84 dB(A) 6/40 (1,133) 90 (6.2) 3/8"-24 male 3.9 (1.8) 14-1/4 (362) 3-1/2 (89)
52379 1.0 (744) 12,000 82 dB(A) 5/38 (1,076) 90 (6.2) 3/8"-24 male 3.9 (1.8) 14-1/4 (362) 4-1/2 (113)
52380 1.0 (744) 15,000 83 dB(A) 5/39 (1,104) 90 (6.2) 3/8"-24 male 3.9 (1.8) 14-1/4 (362) 4-1/2 (113)
Additional Specifications: Air Inlet Thread 3/8" NPT • Hose I.D. Size 3/8" (10 mm) • Air Flow Rate Based At Max HP. • Air Pressure 90 PSIG Max
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