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Disassembly/Assembly Instructions - .3 Hp./7°/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.

To Disassemble:

1. Disconnect tool from power source.

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

3. Remove 50141 Back-up Pad.

4. With an adjustable pin wrench, remove 01560 Exhaust Cover by turning counter-clockwise.

5. Pull motor assembly from housing.

6. Reposition motor housing in vise so inlet bushing is facing upwards.

7. Remove 94523 Inlet Bushing and muffler assembly from valve body housing. Using needle nose pliers, remove spring, tip valve and seal.

8. Remove 95711 Retaining Ring from inlet adapter and disassemble muffler assembly.

9. Using a 2.5mm 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.

Motor Disassembly:

1. Remove 50133 Adapter from rotor shaft by inserting 3mm hex wrench through adapter and into rotor shaft. Twist adapter from shaft.

2. Remove 01478 Front Bearing Plate, cylinder, blades (4) and 01479 Spacer from rotor. Note: 02649 Bearing ia a slip fit into 01478 Front Bearing Plate.

3. Press rotor from 01474 Rear Bearing Plate. Press 02650 Bearing from rear bearing plate (Heat may be required to loosen adhesive.).

Motor disassembly is complete.

Motor Reassembly:

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

1. Place 01475 Rotor in padded vise with threaded spindle facing upwards.

2. Slip 01479 Spacer onto rotor.

3. Place a .002" shim into 01478 Front Bearing Plate as an initial spacing (Note: 54529 Shim Pack contains .001" and .002" shims) and slip 02649 Bearing

into plate.

4. Install bearing/bearing plate assembly onto rotor.

5. Tighten 50133 Adapter 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 shim if necessary.

7. Once proper rotor/gap clearance is achieved, install well lubricated 01480 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 bearing plate and that the pin in the front bearing plate aligns correctly

with the pin-hole in the cylinder.

9. Apply one drop of #609 Loctite® (or equivalent) to outer race of 02650 Rear Bearing and install into 01474 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. A loose fit will not achieve the proper preload of motor bearings. If too tight, rotor will not

turn freely. Rotor must then be lightly tapped at press fit end so it will turn freely while stillmaintaining a snug fit.

10. Secure motor housing in padded vise using 52296 Repair Collar with motor cavity facing upwards.

11. Install motor assembly into housing. Be sure motor drops all the way into housing.

12. Insert 01580 Silencer into 01560 Exhaust Cover and install onto motor housing (torque to 28 N•m/250 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.

Motor assembly is complete.

Valve Body Reassembly:

1. Insert 01469 Speed Regulator with valve stem and o-rings installed, into housing, secure with 95558 Retaining Ring.

2. Place seal into housing. Using tweezers or needle nose pliers, place the tip valve into the housing so that the pin goes into the valve stem hole of

regulator assembly.

3. Place 01468 Spring into housing with small end towards valve assembly.

4. Reassemble muffler assembly. Slip 94523 Inlet Adapter through muffler assembly and secure with 95711 Retaining Ring.

5. Install air control ring into valve body housing.

6. Apply Hernon #940 PST Pipe Sealant (or equivalent) to threads of inlet bushing and install muffler assembly onto valve body (torque 23.0 N•m/200 in. - lbs.).

7. Install throttle lever and 12132 Pin. Remove from vise.

Tool Reassembly 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.

Loctite® is a registered trademark of Loctite Co.