Dynabrade 52772 User manual

Reversible Pistol Grip 0.5 hp. Drill
Model: 52772, 52774, 52775, 52777
Important: Use these instructions along with the tool manual.
Notice: To avoid damage, use the Special Repair Tools designed for disassembly and assembly.
Disconnect tool from the air supply.
Use 1/8" hex key to remove 96266 Screw from drill chuck. Left Hand Thread turn clockwise.
Use a 17 mm open end wrench and a 7/32" flat-end drive punch to remove drill chuck. Turn
chuck counterclockwise.
Motor Disassembly:
1. Place protective padding around housing. Fasten drill in vise with spindle pointing up.
Use a 1-9/16" (~40 mm) crowfoot or adjustable wrench to remove gear housing.
Turn counterclockwise. (See: Planetary Gear Disassembly)
1-9/16"
Crowfoot
PROTECTIVE
PADDING

HEAT
GUN
2. Remove motor from housing:
a) Carefully fasten 53339 Front Plate in vise with aluminum or bronze jaws.
b) Notice: Motor is held by o-rings. Use HEAT GUN to warm and expand housing.

3. Pull up and wiggle housing to release motor. Remove motor from housing.

4. Fasten 96346 Bearing Separator (2") around 52046 Cylinder. Place separator and
motor in 96232 Arbor Press (#2) with rotor spindle pointingdown.
Use a Ø 1/4" or 6 mm flat end drive punch to push rotor out of 02649 Bearing.
96232 Arbor Press
Ø 1/4" or 6 mm flat punch
96346 Bearing Separator

5. Use 96213 Bearing Removal Tool and arbor press to remove 02649 Bearing from
52044 Rear Plate.
96213 Bearing Removal Tool

6. Use arbor press and separator to remove rotor from front bearing and plate.
Remove 02651 Bearing, 53339 Front Plate, shims, and 53337 Spacer.

ng
Re
7. Use 96214 Bearing Removal Tool to push 02651 Bearing and 96556 Wave Washer
out of 53339 Front Plate. Remove shims from plate.
96214 Bearing Removal Tool

Motor disassembly completed.
Clean and inspect parts for wear or damage.

Motor Assembly:
1. Select .003" (~0.08 mm) shim thickness from 53397 Shim Pack.
Place shims into 53339 Front Plate.
Install 02651 Bearing.
Install 96556 Wave Washer.

2. Install 53337 Spacer onto rotor.
Use RAISED INSIDE DIAMETER of 96239 Bearing Press Tool and arbor press
to install; 53339 Front Plate, shims and 02651 Bearing. Notice: Use a socket on
top of 96239 to extend depth of press tool.
96239 Bearing Press Tool

3. By hand, move front plate forward, away from rotor.
Check clearance between rotor and front plate. Use a .001" (~0.03 mm) thick
feeler gauge. Notice: Clearance should be .001"-.0015" (~0.03-0.04 mm).
If rotor/plate clearance needs further adjustment, repeat steps 1-3. Remove,or
add shims as required.
.001"-.0015"
(~0.03-0.04 mm)

OIL
4. Oil 01057 Vanes with 95842 Dynabrade Air Lube 10W/NR or equivalent and install
in rotor.

5. Use RAISED INSIDE DIAMETER of 96239 Bearing Press Tool to support 02651
Bearing. Use RAISED INSIDE DIAMETER of 96240 Bearing Press Tool and arbor
press to install 02649 Bearing. Notice: Press bearing and plate down until it just
touches the cylinder. This will create a close fit between the cylinder and plates.
96239 Bearing Press Tool
96240 Bearing Press Tool
AIR INLETS
AIR EXHAUST
JUST
TOUCH

96556 Wave Washer
6. Install 96556 Wave Washer into 53339 Front Plate.

96583 O-Rings (3)
7. Install 96583 O-Rings (3) into housing.
Apply oil to O-Rings. Use 95842 Dynabrade Air Lube 10W/NR or equivalent.

8. Line-up motor pin with notch inside Housing.
Install motor.
HOUSING
MOTOR
MOTOR
LINE-UP
PIN

~.0
9. 53339 Front Bearing Plate should stand ~.080" (2.04 mm) beyond edge of housing.
Motor assembly completed.
80" (2.04
mm)

Planetary Gear Disassembly:
NOTICE: Use these instructions along with the tool manual. Apply similar steps to
double gear reduction models: 52772 and 52774.
1. Use a 2.5 mm hex key to remove 96467 Set Screw. Turn counterclockwise.
2.5
mm

2. Use 96232 Arbor Press (#2) to push spindle with gear assembly out of housing.
96232 Arbor Press

2. a) By hand remove gear assembly components.
96232 Arbor Press (#2)