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Dynabrade 52772 Disassembly & Assembly Instructions

Reversible pistol grip 0.5 hp. drill
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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)
Reversible Pistol Grip 0.5 hp. Drill
1-9/16" Crowfoot
PROTECTIVE PADDING

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Summary of Contents for Dynabrade 52772

  • Page 1 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.
  • Page 2 HEAT 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.
  • Page 3 Pull up and wiggle housing to release motor. Remove motor from housing.
  • Page 4 96232 Arbor Press Ø 1/4" or 6 mm flat punch 96346 Bearing Separator Fasten 96346 Bearing Separator (2") around 52046 Cylinder. Place separator and motor in 96232 Arbor Press (#2) with rotor spindle pointing down. Use a Ø 1/4" or 6 mm flat end drive punch to push rotor out of 02649 Bearing.
  • Page 5 96213 Bearing Removal Tool Use 96213 Bearing Removal Tool and arbor press to remove 02649 Bearing from 52044 Rear Plate.
  • Page 6 6. Use arbor press and separator to remove rotor from front bearing and plate. Remove 02651 Bearing, 53339 Front Plate, shims, and 53337 Spacer.
  • Page 7 96214 Bearing Removal Tool 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.
  • Page 8 Motor disassembly completed. Clean and inspect parts for wear or damage.
  • Page 9 Motor Assembly: Select .003" (~0.08 mm) shim thickness from 53397 Shim Pack. Place shims into 53339 Front Plate. Install 02651 Bearing. Install 96556 Wave Washer.
  • Page 10 96239 Bearing Press Tool 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.
  • Page 11 .001"-.0015" (~0.03-0.04 mm) 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.
  • Page 12 Oil 01057 Vanes with 95842 Dynabrade Air Lube 10W/NR or equivalent and install in rotor.

  • Page 13: Air Inlets

    96240 Bearing Press Tool AIR INLETS JUST TOUCH AIR EXHAUST 96239 Bearing Press Tool 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.
  • Page 14 96556 Wave Washer Install 96556 Wave Washer into 53339 Front Plate.
  • Page 15 96583 O-Rings (3) Install 96583 O-Rings (3) into housing. Apply oil to O-Rings. Use 95842 Dynabrade Air Lube 10W/NR or equivalent.
  • Page 16 MOTOR LINE-UP MOTOR HOUSING Line-up motor pin with notch inside Housing. Install motor.
  • Page 17 80" (2.04 mm) 53339 Front Bearing Plate should stand ~.080" (2.04 mm) beyond edge of housing. Motor assembly completed.
  • Page 18 Planetary Gear Disassembly: NOTICE: Use these instructions along with the tool manual. Apply similar steps to double gear reduction models: 52772 and 52774. 2.5 mm Use a 2.5 mm hex key to remove 96467 Set Screw. Turn counterclockwise.
  • Page 19 96232 Arbor Press Use 96232 Arbor Press (#2) to push spindle with gear assembly out of housing.
  • Page 20 96232 Arbor Press (#2) a) By hand remove gear assembly components.
  • Page 21 96214 Bearing Removal Tool 96346 Bearing Separator BEVELED SIDE Use 96346 Bearing Separator and 96214 Bearing Removal Tool to remove the 02651, 01036 or 53330 Bearing from carrier. IMPORTANT: Always position flat side of carrier toward the ring gear and beveled side toward the bearing. Remove gears form carrier.
  • Page 22 Tap carrier on a hard surface so shafts fall out of carrier. Remove gears.
  • Page 23 To remove 55038 Nut, fasten carrier with spindle pointing up in vise with aluminum or bronze jaws. Use an adjustable wrench to remove nut. Turn counterclockwise.
  • Page 24 Use arbor press to push carrier out of 01036 Bearing.
  • Page 25 Planetary gear disassembly completed. Clean and inspect parts for wear or damage.
  • Page 26 Planetary Gear Assembly: 1. To install 01036 Bearing onto carrier spindle, use 15 mm deep-well socket as press tool and arbor press.
  • Page 27 Torque to 17 N•m/~150 lbs. in. Loctite #271 19 mm 2. With spindle pointing up, fasten carrier in vise with aluminum or bronze jaws. Apply a small amount of Loctite #271 or equivalent, to spindle thread closest to bearing. Install 55038 Nut onto carrier. Use a 19 mm crowfoot and torque wrench to tighten spindle nut.
  • Page 28 Apply 95542 Grease or equivalent to gears and bearings.
  • Page 29 Install gears and 53182 Shafts into carrier.
  • Page 30 5. To install 02651 Bearing onto carrier use arbor press and 96239 Bearing Press Tool. To install 53330 or 01036 Bearing onto carrier use arbor press and 96240 Bearing Press Tool. Press bearing so that it just touches the ring gear. (See Photo Below) 96240 Bearing Press Tool Just Touch...
  • Page 31 53385 Ring Gear Gear Housing Install ring gear so that openings line-up with set screw and lube fitting openings in gear housing.
  • Page 32 Install 55031 Seal in gear housing.
  • Page 33 Install gear assembly in gear housing. IMPORTANT: Models 52772 and 52774, install 53188 Spacer before installing second planetary assembly. (See Tool Manual) IMPORTANT: Models 52774 and 52777 (with 53333 Bearing) install 53334 Spacer between planetary and motor assemblies. (See Tool Manual)
  • Page 34 Use a small screwdriver to rotate and line-up ring gear openings with openings in gear housing.
  • Page 35 Loctite #567 2.5 mm Hex Key 10. Apply a small amount of #567 Loctite to thread of 96467 Set Screw. Use a 2.5 mm hex key to install set screw. Planetary gear assembly completed.
  • Page 36 Final Assembly: #243 Loctite Apply #243 Loctite or equivalent to threads on gear housing.
  • Page 37 Torque to 28 N•m/~250 lbs. in. PROTECTIVE PADDING Use protective padding around housing and fasten drill in vise with spindle pointing up. Use a 1-9/16" (~40 mm) crowfoot or adjustable wrench to fasten gear housing. Turn clockwise. Torque to 28 N•m/~250 lbs. in. Initially, use 95541 Lubricant Gun to apply three plunges of 95542 Grease through 01041 Lube Fitting.

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