Dynabrade 40381 Disassembly & Assembly Instructions

Disassembly Instructions - 0.4 hp, Dynafile II Slow Speed

Model: 40381
Notice: Use these instructions along with tool manual. See also, Dynafile II, 0.4 hp

Motor, found under Repair Tutorials on the Dynabrade website.

Important:

Shut off air supply and depress throttle lever to deplete air.
Disconnect tool from air supply hose.
Use 3 mm hex key to loosen 95311 Screw and remove motor from belt housing.
Use a small adjustable wrench to hold 40358 Adapter stationary. By hand remove

40375 Drive Wheel. Turn counterclockwise.

Motor Disassembly:

Planetary Gear Disassembly:

96461 Repair Collar

1. Use 96461 Repair Collar to hold housing in a vise with 40358 Adapter pointing up.

2. Use 50971 Lock Ring Tool to remove 40359 Exhaust Cover.
Turn counterclockwise.

Use a 2 mm hex key to remove 50784 Set
Screw.
Remove planetary gear assembly.

Flat side of 96346 Separator toward ring gear.

3. Fasten 96346 Bearing Separator between bearing and ring gear. Face flat side of

separator toward ring gear and bevel side toward bearing.

5/16" flat-end Drive Punch

and 96232 Arbor Press

4. Use a 5/16" flat-end drive punch as a press tool and 96232 Arbor Press to push the

planetary carrier out of the 54552 Bearing.

5. Remove the ring gear.

To remove shafts and planet gears, gently tap the carrier on a hard surface.
The shafts and gears will fall out.

6. With planetary carrier pointing up, carefully fasten 40358 Adapter in vise with

aluminum or bronze jaws.

Insert a screwdriver through carrier and turn counterclockwise to remove adapter.

7. Use arbor press and 5/16" flat-end drive punch as a press tool to push the planetary

carrier out of the remaining 54552 Bearing.

Planetary gear disassembly completed.

Important: Clean and inspect parts before assembling.

Motor Disassembly:

1. Pull motor from housing.

2. Remove 02679 Shield from 02696 Bearing.

3. Fasten 96346 Bearing Separator (2") around 01476 Cylinder.
Place bearing separator and motor in 96232 Arbor Press (#2) with pinion
pointing down.
Use a Ø 3/16" or ~4 mm flat-end drive punch to push rotor out of bearing.
Remove cylinder and vanes.

4. By hand, use Ø 3/16" or ~4 mm flat-end drive punch to push 02696 Bearing (slip-fit)

out of 02673 Rear Plate.