Dynabrade 52223 Manual - Page 3

Browse online or download pdf Manual for Grinder Dynabrade 52223. Dynabrade 52223 4 pages. .5 hp/7/short shank/rear exhaust die grinder, 15,000/18,000/20,000/24,000 rpm, 1/4 collet

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Disassembly/Assembly Instructions – .5 Hp Rear Exhaust

Important: Manufacturer's warranty is void if tool is disassembled before warranty expires.

Notice: Dynabrade strongly recommends the use of their 52296 Repair Collar (sold separately) during assembly/disassembly activities. Failure to

use this collar will highly increase the risk of damage to the valve body of this tool. Please refer to parts breakdown for part identification.

Motor Disassembly:

1. Disconnect tool from power source.

2. Secure air tool in vise using 52296 Repair Collar.

3. With an adjustable pin wrench or 50971 Lock Ring Tool remove 04072 Lock Ring by turning counter-clockwise. Remove 04066 Felt Silencer

and 04069 Block Plate.

4. Remove collet from rotor shaft by inserting a 3/16" hex wrench through collet body and into rotor shaft. Twist collet from shaft.

5. Remove 01013 Cylinder, blades (4) and 01010 Spacer from rotor. Note: 01007 Bearing, 01008 Front Bearing Plate and spacer are a slip fit onto rotor.

6. Press rotor from 01014 Rear Bearing Plate. Press 01015 Bearing from bearing plate.

Optional: To disassemble the valve body from the motor housing, peel back 01558 Collar to expose 01461 Lock Nut. Unscrew lock nut/valve body

from housing (left hand threads).

Motor Disassembly Complete.

Valve Body Disassembly:

1. Position valve body in vise using 52296 Repair Collar with air inlet facing up.

2. Remove air fitting by securing 94523 Inlet Adapter with a wrench and twist air fitting from inlet adapter.

Important: 94523 Inlet Adapter must be secured before attempting to remove air fitting to avoid damaging valve body housing.

3. Remove 94523 Inlet Adapter.

4. Remove 95711 Retaining Ring from inlet adapter and separate 94521 Muffler Base from 94522 Muffler Cap. Remove sintered muffler and felt muffler.

5. Remove air control ring from valve body. Using needle nose pliers, remove 01468 Spring, 01472 Tip Valve and 01464 Seal.

6. Using a 2.5mm drift pin, tap 12132 Pin from housing and remove throttle lever.

7. Remove 95558 Retaining Ring. Push 01469 Regulator from valve body and remove o-rings.

Disassembly Complete.

Motor Assembly:

Important: Be sure parts are clean and in good repair before assembling.

1. Place rotor in padded vise with a threaded spindle facing upwards.

2. Slip 01010 Spacer onto rotor.

3. Place a .002" shim into front bearing plate as an initial spacing and slip 01007 Bearing into plate. Note: 01121 Shim Pack contains .001" and .002" shims.

4. Install bearing/bearing plate assembly onto rotor.

5. Tighten collet assembly onto rotor (torque to 17 N•m/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 shims if necessary.

7. Once proper rotor/gap clearance is achieved, install well lubricated 01011 Blades (4) into rotor slots. Dynabrade Air Lube P/N 95842 is recommended.

8. Install cylinder over rotor. Be sure air inlet holes of cylinder face away from bearing plate.

9. Press 01015 Rear Bearing into 01014 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 04069 Block Plate and 04066 Felt Silencer into 04072 Lock Ring and install onto motor housing (torque 17 N•m/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 Body Assembly:

1. Insert 01469 Regulator with o-rings and valve stem in place into valve body. Secure with 95558 Retaining Ring.

2. Secure valve body in vise using 52296 Repair Collar with air inlet facing upwards. Insert 01464 Seal.

3. Line up hole in valve stem with hole in housing (looking past brass bushing). Insert 01472 Tip Valve so that the metal pin passes through the hole in the

valve stem. Install 01468 Spring (small end towards tip valve).

4. Assemble sintered muffler and felt muffler together and place in 94522 Muffler Cap. Install 94521 Muffler Base onto muffler cap.

5. Install 95438 O-Ring into groove on muffler base. Place 95375 O-Ring and 94526 Spacer into recessed area of muffler cap.

6. Slip 94523 Inlet Adapter through muffler assembly and install 95711 Retainer Ring into groove on inlet adapter.

7. Install air control ring into valve body housing.

8. Apply Loctite

#567 PST Pipe Sealant to threads of 94523 Inlet Adapter and install entire muffler assembly onto valve body (torque 23.0 N•m/200 in. - lbs.).

9. Replace air fitting. Secure inlet adapter with a wrench before tightening air fitting. Install throttle lever and 12132 Pin.

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. Before operating, place 2-3 drops of Dynabrade Air Lube (P/N 95842) directly into air

inlet with throttle lever depressed. Operate tool for 30 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.