Dynabrade 52700 Manual del usuario - Página 3

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Service/Repair Instructions — .7 Hp/3" Gearless Depressed Center Wheel Grinder

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 grinding wheel, flanging and wheel guard.

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 2.5mm 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.

Optional: To disassemble valve body from motor housing, peel back 01558 Collar to expose 01462 Lock Nut. Unscrew lock

nut/valve body from housing (left hand threads).

Motor Disassembly:

1. Remove 01708 Rotor Nut from rotor shaft by inserting 3/16" hex wrench through rotor nut and into rotor shaft.

Twist 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 is complete.

Motor Reassembly

(Be sure parts are clean and in good repair before reassembly)

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 Pak contains .001" and .002"

shims) and slip 01007 Bearing into plate.

4. Install Bearing/Bearing Plate assembly onto rotor.

5. Tighten 01708 Rotor Nut 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 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 Reassembly:

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 1 drop of #271 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 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.

Note: Throttle lever is preset at the factory at an 11:00 o'clock position.

Loctite is a registered trademark of 3M Company.

Please refer to parts breakdown for part identification.