Dynabrade 52452 User manual

01815 Rotor Nut
Housing
52444 – Model 52452
52445 – Model 52453
52448 – Model 52455
Governor Spring
01832 – 6,000 Rpm
01829 – 7,200 Rpm
52172 – 8,500 Rpm
52467 Spacer
01825 Bearing
52472 Bearing Plate
52173 Shim Pak
50548 Spring Holder
52476 Bearing Plate
01036 Bearing
52475 Cylinder
50511 Screw (2)
01791 Washer (2)
52461 Housing Cap
52165 Gasket
52180 Clamp
52164
Exhaust
Cover
01089 Lever
01697 Inlet Bushing
01017 Pin
52494 Valve Body
(Inc. 07142 Bushing)
07168 Valve Stem Assembly
07145 Spring
07146 Packing
07147 Plug
01746 “O” Ring
52491 Adj. Bushing
52496 Packing07136 Handle Grip
52477 Gasket
50541 Governor Valve
52478 Governor Cage
96059 Governor Pin (2)
Air Motor and Machine Parts
Always operate, inspect and maintain this tool in accordance with the Safety Code for portable air
tools (ANSI B186.1, B7.1) and any other applicable safety codes and regulations. Please refer to
Dynabrade's Warning/Safety Operating Instructions for more complete safety information.
WARNING
!
See reverse side for Accessories and Important Operating, Maintenance and Safety Instructions.
Model:
52452 – 6,000 RPM
52453 – 7,200 RPM
52455 – 8,500 RPM
Parts Page Reorder No. PD97•36
Effective May, 1997
7" Vertical
Grinder
52466 Rotor
01791 Washer (4)
95720
Screw (4)
01673 Pin
L2 L3T8
L2
T5
T2
01823 Washer
01835 Shim Packet
T6
52471 Shim Pak
01672 Pin
T4
52474
Blade (4/pkg.) O
T4
T9
95375 O-Ring
94522 Muffler Cap
52166 Seal
Governor Weight (2)
52497 – 6,000 Rpm
52498 – 7,200 Rpm
52498 – 8,500 Rpm
50468 Pin
KEY
L
T
O
Loctite/Hernon: L2= Loctite #271, L3= Loctite #380,
L4= Hernon #940
Torque: N•m x 8.85 = In. - lbs.
T2= 4.5 N•m, T3= 7 N•m, T4= 9 N•m, T5= 17 N•m,
T6= 22.5 N•m, T7= 45 N•m, T8= 50 N•m, T9= 56 N•m
G
Oil Grease
52495 Nut T7
L4
52169 Handle

2
(PD97•36)
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 air tools must be used with a Filter-Regulator-Lubricator to maintain all warranties.
Operating Instructions:
Warning: Eye, face 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 air motors should be lubricated. Dynabrade recommends one drop of air lube per minute for each 10 SCFM (example : if the tool
specification state 40 SCFM, set the drip rate of your filter-lubricator at 4 drops per minute). Dynabrade Air Lube (P/N 95842: 1pt. 473ml.) is recommended.
4. An air line filter-regulator-lubricator must be used with this air tool to maintain all warranties. Dynabrade recommends the following: 11299 Air Line Filter-
Regulator-Lubricator — Provides accurate air pressure regulation, two-stage filtration of water contaminants and micro-mist lubrication of pneumatic
components. Operates 100 CFM @ 100 PSI has 1/2" NPT female ports.
5. Use only genuine Dynabrade replacement parts. To reorder replacement parts, specify the Model #, Serial #, and RPM of your machine.
6. A motor tune-up kit (P/N 96259) 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.
Safety Instructions:
Products offered by Dynabrade should not be converted or otherwise altered from original design without expressed written consent from
Dynabrade, Inc.
•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.
•Important: This tool is designed for use with Type 27 wheels 7" diameter only. Never remove wheel guard.
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, sanding pads, rotor blades, etc., are not covered under this warranty.
Machine Length Height Weight Spindle Air Flow Rate Sound Motor
Number Inch (mm) Inch (mm) Pound (kg) Thread SCFM (LPM) Level HP (W)
Number 13" (330) 8-1/4" (210) 9 lbs. (4.1) 5/8"-11 male 57 (1,614) 87 dBA 2.0 (1,491)
Additional specifications: Air Inlet Thread 1/2" (13 mm) NPT • Hose Size 1/2" (13 mm) • Air Pressure 90 PSI (6.2 Bars)

3
Disassembly/Assembly Instructions
Important: Manufacturer’s warranty is void if tool is disassembled before warranty expires.
A Motor Repair Kit (96259) is available which contains special tools for disassembly/assembly. Please refer to parts breakdown for part identification.
Tool Disassembly:
1. Disconnect tool from power source.
2. Remove back-up pad with a 24mm wrench (P/N 95304).
3. Insert 01697 Inlet Bushing securely into vise.
4. Roll 07136 Handle Grip Back away from housing.
5. Remove 52495 Nut by using a 32mm wrench (P/N 96079).
6. Separate valve body from housing.
7. Remove 95720 Screws (4) and 01791 Washers (4) from 52461 Housing Cap. Remove housing cap and 52477 Gasket.
Motor Disassembly:
1. Grip onto governor cage assembly and pull motor assembly from housing.
Note: If motor assembly does not come out freely, gently tap tool rotor side down to "pop" motor from housing.
2. Remove governor cage assembly from 52466 Rotor (left hand thread).
3. Insert a tap pin into rear bearing plate and press the 52466 Rotor from the rear bearing plate.
4. Place motor assembly in softjaw vise.
5. Remove 01823 Washer and 01835 Shim from assembly.
6. Remove 01815 Rotor Nut with an adjustable wrench. Twist rotor nut from shaft
7. Remove 52475 Cylinder, blades (4) and spacer from rotor.
8. Remove 52472 Front Bearing Plate , front bearing and shims from 52466 Rotor. Note: Bearing, front bearing plate and spacer are a slip fit into rotor.
9. Press 01036 Bearing from bearing plate.
Motor disassembly complete.
Motor Reassembly:
Important: Be certain all parts are cleaned and in good repair before reassembly.
1. Place 52466 Rotor in padded vise with threaded spindle facing upwards.
2. Slip 52467 Spacer onto rotor.
3. Place .002" shim into front bearing plate as initial spacing and slip 01825 Bearing into plate. Note: 52471 Shim Pak contains .001" and .003" shims.
(continued on next page)
Mounting Arrangement for Type 27 Wheels
Important: Dynabrade P/N 11399 Type 27 Wheel Adapter Kit (included) must be used with all Type 27 wheels larger than 5" diameter.
Type 27 Wheels because of their shape and
usage, must be mounted with specially designed
adapters (see illustration).
Type 27 Guard
*97311 Spacers
(as req.)
*07139 Adapter Nut
*95051 3/8" Hex Key
Note: Additional spacers may be required.
*Identifies parts included in 11399 Type 27 Wheel Adapter Kit.
*
52176 Wheel Adapter/Back Flange
extends beyond the raised
hub
portion of wheel.
Torque
28 N•m (250 lb • in.)
Depressed Center Wheel
(not included)
Grind with
this face
Wheel adapter/back flange must extend beyond the central
hub or raised portion of the wheel — and contact the flat
portion of the wheel to counteract side pressure.
The adapter nut fits into the depressed center portion of the
wheel to prevent interference with the work. This nut should be
tightened only enough to prevent slippage and satisfactorily
transfer the driving torque of the spindle to the wheel through
the adapter assembly.
Some wheels are supplied with throw away adapters (mounting
flanges) attached by the manufacturer. These adapters should
not be used again.
Important Safety Information
1. Always use eye, face and body protection.
2. Always use wheel guard.
3. For safe use of this tool, always comply with
OSHA, ANSI Standards B7.1 and B186.1.
Warning: Do not remove wheel guard.
Type 27

Optional Accessories
Wrenches
Dynaswivel®
Swivels 360° at two locations which
allows an air hose to drop straight to
the floor, no matter how the tool is held.
•95460 1/4" NPT
•95461 3/8" NPT
•95462 1/2" NPT
96259 Motor Tune-Up Kit:
•Includes assorted parts to help maintain
motor in tip-top shape.
95303 – 1/4" Hex Wrench 95304 – 24mm Open-End
96079 – 32mm Open-End
Disassembly/Assembly Instructions (continued)
4. Install bearing/bearing plate assembly onto rotor.
5. Install 01815 Rotor Nut onto assembly.
6. Tighten rotor nut onto rotor, torque 22.5 N•m/200 in. - lbs.
7. 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 shims if necessary.
8. Once proper rotor/gap clearance is achieved, install well lubricated 52474 Blades (4) into rotor slots. Dynabrade Air Lube P/N 95842 (or equivalent) is
recommended for lubrication before installation in rotor slots.
9. Install cylinder over rotor.
10. Press the 01036 Rear Bearing into 52476 Rear Bearing Plate. Press bearing/bearing plate assembly onto rotor. Be sure that pin and air inlet slot line-up
with pin hole and air inlet slot in cylinder.
11. Place the tool into a soft jaw vise and tighten the governor assembly (52478 Governor Cage) torque 9.0 N•m/80 in. - lbs. (left hand thread).
12. Place 01835 Shim and 01823 Washer into housing.
13. Install 52477 Gasket and 52461 Housing Cap with 95720 screws and 01791 Washers, tighten screws to 9 N•m/80 in. - lbs.
14. Place complete motor assembly into housing. Be sure motor drops all the way into housing.
15. 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 a shim.
16. Apply 2 drops of #271 Loctite® (or equivalent) to threads of adjustment bushing before tightening.
17. Slip 52491 Bushing through 52495 Nut and packing, and secure into housing.
18. Tighten 52491 Adjustment Bushing into housing torque 50 N•m/450 in. - lbs. Tighten valve body into housing.
19. Secure inlet bushing into vise. Place 52495 Nut and 01746 O-Ring onto valve body. Swivel 52494 Valve Body to desired throttle lever position.
20. Tighten 52495 Nut to 45 N•m/400 in. - lbs. Roll 07136 Grip back into place.
Tool assembly is complete. Please allow 30 minutes for adhesives to cure before operating tool.
Important: Motor should now be tested for proper operation at 90 PSI. 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. Before operating, place 2-3 drops of Dynabrade Air Lube (P/N 95842) directly into air inlet
with throttle lever depressed. Operate tool for thirty seconds to determine if tool is operating properly and to allow lubricating oils to properly penetrate motor.
Loctite® is a registered trademark of Loctite Corp.
DYNABRADE®
DYNABRADE, INC., 8989 Sheridan Drive •Clarence, NY 14031-1490 •Phone: [phone] •Fax: [phone] •International Fax: [phone]
DYNABRADE EUROPE S.àr.l., Zone Artisanale •L-5485 Wormeldange—Haut, Luxembourg •Telephone: [phone] •Fax: [phone]
©DYNABRADE, INC., 1997 PRINTED IN USA
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