Dynabrade 52240 User manual

Parts Page Reorder No. PD02•12
Effective February, 2002
Supersedes PD94•49
Model:
52240 – 1/4" Collet, 15,000 RPM
52241 – 1/4" Collet, 18,000 RPM
52242 – 1/4" Collet, 20,000 RPM
52284 – 6mm Collet, 15,000 RPM
52285 – 6mm Collet, 18,000 RPM
52286 – 6mm Collet, 20,000 RPM
52287 – 6mm Collet, 20,000 RPM (w/ 53163 Side Handle) Machine and Motor Parts
Always operate, inspect and maintain this tool in accordance with the Safety Code for portable air tools
(ANSI B186.1) and any other applicable safety codes and regulations. Please refer to Dynabrade's
Warning/Safety Operating Instructions for more complete safety information.
WARNING
!
.7Hp/7˚/Front Exhaust
Die Grinder
See inside for Important Operating, Maintenance and Safety Instructions.
1Collet Assembly
50010 1/4"
50015 6 mm
2Exhaust Cover
01734 15,000 RPM
01738 18,000 RPM
01748 20,000 RPM
301744 Silencer
401708 Rotor Nut
501007 Bearing
601121 Shim (3/pkg.)
701008 Plate
850767 Guide Pin (2)
901010 Spacer
10 01028 Cylinder
11 55025 Rotor
12 01185 Blade (4/Pkg.)
13 01743 Bearing Plate
14 02649 Bearing
15 01739 Motor Housing
16 01437 Plug
17 01548 Gasket
18 01461 Lock Nut
19 01558 Collar
20 01448 Throttle Lever
01462 Safety Throttle Lever
21 12132 Pin
22 95558 Retaining Ring
23 Housing (See Chart)
24 01449 Valve Stem
25 95730 O-Ring
26 01024 O-Ring
27 01469 Speed Regulator Assy.
28 01464 Seal
29 01472 Tip Valve
30 01468 Spring
31 01494 Inlet Bushing
32 50033 Hanger
01572 – Model 52240
01573 – Model 52241
01574 – Model 52242
01912 – Model 52284
01913 – Model 52285
01923 – Model 52286
01925 – Model 52287
Valve Body
13 6 7
8 8 16
17
18
19
12
910 11 13 14 155
Index Key
No. Part # Description
A
T
O
Adhesive: A8= Loctite #567
Torque: N•m x 8.85 = In. - lbs.
Oil: O1= Air Lube
KEY
Left Hand Threads
17 N•m
T
34 N•m T
45 N•m T
A8
O1
4
2
A8
A8
O1
23 N•m
T
32
22
20
21
31
30
29
28
24
25
26
27
Right Hand Threads
23

2
Important Operating, Maintenance and Safety Instructions
Carefully read all instructions before operating or servicing any Dynabrade®Abrasive Power Tool.
Warning: Hand, wrist and arm injury may result from repetitive work motion and overexposure to vibration.
Important: All Dynabrade Rotary Vane air tools must be used with a Filter-Regulator-Lubricator to maintain all warranties.
Operating Instructions:
Warning: Eye, face, respiratory, sound, and body protection must be worn while operating power tools. Failure to do so may result in serious injury or death.
Follow safety procedures posted in workplace.
1. With power source disconnected from tool, securely fasten abrasive/accessory on tool.
2. Install air fitting into inlet bushing of tool. Important: Secure inlet bushing of tool with a wrench before attempting to install the air fitting to avoid
damaging valve body housing.
3. Connect power source to tool. Be careful not to depress throttle lever in the process.
4. Check tool speed with tachometer. If tool is operating at a higher speed than the RPM marked on the tool or operating improperly, the tool should be
serviced to correct the cause before use.
Maintenance Instructions:
1. Check tool speed regularly with a tachometer. If tool is operating at a higher speed than the RPM marked on the tool, the tool should be serviced to
correct the cause before use.
2. Some silencers on air tools may clog with use. Clean and replace as required.
3. All Dynabrade Rotary Vane air motors should be lubricated. 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 of your filter-lubricator at 4 drops per minute).
Dynabrade Air Lube (P/N 95842: 1 pt. 473 ml.) is recommended.
4. An Air Line Filter-Regulator-Lubricator must be used with this air tool to maintain all warranties. Dynabrade recommends the following: 11405 Air Line
Filter-Regulator-Lubricator — Provides accurate air pressure regulation, two-stage filtration of water contaminants and micro-mist lubrication of
pneumatic components. Operates 40 SCFM @ 100 PSIG has 3/8" NPT female ports.
5. Use only genuine Dynabrade replacement parts. To reorder replacement parts, please specify the Model #, Serial # and RPM of your machine.
6. A Motor Tune-Up Kit (P/N 96045) is available which includes assorted parts to help maintain motor in peek operating condition.
7. Mineral spirits are recommended when cleaning the tool and parts. Do not clean tool or parts with any solvents or oils containing acids, esters, keytones,
chlorinated hydrocarbons or nitro carbons.
(PD02•12)
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.
•Important: User of tool is responsible for following accepted safety codes such as those published by the American National Standards Institute (ANSI).
•Operate machine for one minute before application to workpiece to determine if machine is working properly and safely before work begins.
•Always disconnect power supply before changing abrasive/accessory or making machine adjustments.
•Inspect abrasives/accessories for damage or defects prior to installation on tools.
•Please refer to Dynabrade’s Warning/Safety Operating Instructions Tag (Reorder No. 95903) for more complete safety information.
•Warning: Hand, wrist and arm injury may result from repetitive work, motion and overexposure to vibration.
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.
Safety Instructions:
Products offered by Dynabrade should not be converted or otherwise altered
from original design without expressed written consent from Dynabrade, Inc.
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)
52240 .7 (522) 15,000 85 dBA 4/28 (793) 90 (6.2) 3/8"-24 male 1.7 (.8) 6 (152) 5-1/2 (140)
52241 .7 (522) 18,000 87 dBA 4/28 (793) 90 (6.2) 3/8"-24 male 1.7 (.8) 6 (152) 5-1/2 (140)
52242 .7 (522) 20,000 84 dBA 4/28 (793) 90 (6.2) 3/8"-24 male 1.7 (.8) 6 (152) 5-1/2 (140)
Additional Specifications: Air Inlet Thread 1/4" NPT • Hose Size 3/8" (10 mm)

3
Disassembly/Assembly Instructions — .7Hp/7˚/Front Exhaust Die Grinder
Please refer to page 1 for part identification.
Important: Manufactures warranty is void if tool is disassembled before warranty expires.
To Disassemble:
1. Secure air tool in vise using 52996 Repair Collar or padded jaws.
2. Remove collet cap and insert.
3. With a 1-1/2" open-end wrench, remove exhaust cover by turning counter-clockwise.
4. Pull motor assembly from housing.
5. Reposition motor housing in vise so inlet bushing is facing upwards.
6. Unscrew 01494 Inlet Bushing turning counter-clockwise.
7. Using needle nose pliers, remove 01448 Spring, 01472 Tip Valve and 01464 Seal.
8. Resecure housing in vise so throttle lever and 12132 Pin are accessible.
9. Using a 2.5 mm diameter drift pin and a hammer, tap 12132 Pin out from housing and remove throttle lever.
10. Remove 95558 Retaining Ring and push 01469 Speed Regulator from Housing.
Optional: To disassemble valve body from motor housing, peel back 01558 Collar to expose 01461 Lock Nut. Unscrew lock nut/valve body from
housing (left hand threads).
Motor Disassembly:
1. Remove 50011 Collet Body and rotor nut from rotor shaft by inserting 3/16" hex wrench through collet body into rotor shaft. Twist collet body and
rotor nut from shaft.
2. Remove 01008 Front Bearing Plate, cylinder, blades (4) and 01010 Spacer from rotor. Note: 01007 Bearing, 01008 Front Bearing Plate and 01010
Spacer are a slip fit onto rotor.
3. Press rotor from 01743 Rear Bearing Plate. Press 02649 Bearing from bearing plate.
Motor Disassembly Complete.
Motor Assembly: (Be sure parts are clean and in good repair before assembling.)
1. Place rotor in padded vise with threaded spindle facing upwards.
2. Slip 01010 Spacer onto rotor.
3. Place a .002" shim into 01008 Front Bearing Plate as an initial spacing (Note: 01121 Shim Pack contains .001" and .002" shims) and slip
01007 Bearing into plate.
4. Install Bearing/Bearing Plate assembly onto rotor.
5. Tighten 01708 Rotor Nut and collet body onto rotor (torque to 150 in. lbs.).
6. Check clearance between rotor and bearing plate by using a .001" feeler gauge. Clearance should be at .001" to .0015". Adjust clearance by repeating
steps 1-5 with different shim if necessary.
7. Once proper rotor/gap clearance is achieved, install well lubricated 01185 Blades (4) into rotor slots. Dynabrade air lube P/N 95842 is
recommended for lubrication.
8. Install cylinder over rotor. Be sure air inlet holes of cylinder face away from front bearing plate.
9. Press 02649 Rear Bearing into 01743 Rear Bearing Plate. Press bearing/bearing plate assembly onto rotor. Be sure that pin and air inlet holes line-up with pin
slot and air inlet holes in cylinder. Important: Fit must be snug between bearing plates and cylinder. If too tight, rotor will not turn freely. Rotor must then be
lightly tapped at press fit end so it will turn freely while still maintaining a snug fit. A loose fit will not achieve the proper preload of motor bearings.
10. Secure motor housing in padded vise so motor cavity faces upwards.
11. Install motor assembly into housing. Be sure motor drops all the way into housing.
12. Insert 01744 Silencer into exhaust cover and install onto motor housing (torque 150 in. lbs.).
13. Motor adjustment must now be checked. With motor housing still mounted in vise, pull end of rotor and twist (10-15 lbs. force), rotor should turn
freely without drag. If drag or rub is felt, then increase preload or remove shim. Also, push end of rotor and twist (10-15 lbs. force), rotor should
turn freely without drag. If drag or rub is felt, then deload or add shim.
Valve Stem/Body Assembly:
1. Insert 01469 Speed Regulator Assembly into valve body. Secure with 95558 Retaining Ring.
2. Secure valve body in vise using 52996 Repair Collar or padded jaws with air inlet facing upwards and throttle lever accessible.
3. Insert 01464 Seal into housing.
4. Line-up the hole in the 01449 Valve Stem with the hole in the housing (looking past brass bushing). Using needle nose pliers, insert 01472 Tip Valve so
that the metal pin passes through the hole in the valve stem.
5. Install 01468 Spring (small end first).
6. Apply a small amount of #567 Loctite (or equivalent) to threads of 01494 Inlet Bushing and install into valve body (torque 34.0 N•m 300 lbs. in.).
7. Install throttle lever and 12132 Pin. Remove valve body from vise.
Tool Assembly Complete. Please allow 30 minutes for adhesives to cure before operating tool.
Important: Motor should now be tested for proper operation at 90 PSIG. If motor does not operate properly or operates at a higher RPM than marked on the
tool, the tool should be serviced to correct the cause before use.
Note: Throttle lever is preset at the factory at an 11:00 o’clock position.
Loctite is a registered trademark of the Loctite Corp.

DYNABRADE®
DYNABRADE, INC., 8989 Sheridan Drive • Clarence, New York 14031-1490 • Telephone: [phone] • Fax: [phone] • International Fax: [phone]
DYNABRADE EUROPE s.a.r.l., Zone Artisanale • L-5485 Wormeldange—Haut, Luxembourg • Telephone: [phone] • Fax: [phone]
© DYNABRADE, INC., 2002 PRINTED IN USA
Visit Our Web Site: www.dynabrade.com Email: Customer[email protected]
Dynaswivel®
Swivels 360° at two locations which allows an
air hose to drop straight to the floor, no matter
how the tool is held.
•94300 1/4" NPT.
96045 Motor Tune-Up Kit
• Includes assorted parts to help maintain
and repair motor.
Open-End Wrenches
96076 – 12 mm open-end.
95262 – 14 mm open-end.
52296 Repair Collar
•Specially designed collar for use in vise to
prevent damage to valve body housing
during disassembly/assembly.
Dynabrade Air Lube
•Formulated for pneumatic equipment.
•Absorbs up to 10% of its weight in water.
•Prevents rust and formation of sludge.
•Keeps pneumatic tools operating longer
with greater power and less down time.
95842: 1 pt. (473 ml)
95843: 1 gal. (3.8 L)
53163 Side Handle
•Improved ergonomic feel with grip-traction
to reduce hand fatigue.
•5/16"-18 Thread
Collet Inserts
•01485 – 1/4"
•01497 – 6 mm
•01495 – 1/8"
•01496 – 3 mm
Optional Accessories