Dynabrade 53073 Important Operating, Maintenance And Safety Instructions - Page 3

Browse online or download pdf Important Operating, Maintenance And Safety Instructions for Power Tool Accessories Dynabrade 53073. Dynabrade 53073 4 pages. Air motor and machine parts, 3,200 rpm

Print Page

Disassembly/Assembly Instructions - .4 Hp/Straight-Line/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.

Motor Disassembly:

1. Disconnect tool from power source.

2. Secure air tool in vise using 52296 Repair Collar. Remove arbor assembly.

3. With an adjustable pin wrench or 50971 Lock Ring Tool, remove 50781 Rear Exhaust Cover by turning counter-clockwise.

4. Remove 50784 Lock Screw and pull 50782 Adapter and planetary carrier assembly from 53152 Gear Case.

5. Press planetary carrier assembly from rear 54520 Bearing. Remove ring gear and gears from 50786 or 50787 Planetary Carrier.

6. Secure planetary carrier in vise and remove 50782 Adapter. Press carrier from front 54520 Bearing.

7. Grab onto pinion and pull motor assembly from motor housing.

8. Press 54553 or 54554 Rotor from 02696 Rear Bearing. Press 02696 Rear Bearing from rear bearing plate, remove 02679 Shield.

9. Remove cylinder and rotor blades from rotor.

10. Press rotor through 02649 Front Bearing and 01478 Front Bearing Plate.

Motor Disassembly Complete.

Valve Body Disassembly:

1. Position valve body in vise using 52296 Repair Collar with air inlet facing up.

2. Remove air fitting by securing 94523 Inlet Adapter with a wrench and twist air fitting from inlet adapter.

Important: 94523 Inlet Adapter must be secured before attempting to remove air fitting to avoid damaging valve body housing.

3. Remove 94523 Inlet Adapter.

4. Remove 95711 Retaining Ring from inlet adapter and separate 94521 Muffler Base from 94522 Muffler Cap. Remove felt muffler.

5. Remove 01564 Air Control Ring from valve body. Using needle nose pliers, remove 01468 Spring, 01472 Tip Valve and 01464 Seal.

6. Using a 2.5 mm drift pin, tap 12132 Pin from housing and remove throttle lever.

7. Remove 95558 Retaining Ring. Push 01469 Regulator from valve body and remove o-rings.

Disassembly Complete.

Motor Assembly:

Important: Be sure parts are clean and in good repair before assembling. Follow all grease, oil, and torque specifications.

1. Slip 01479 Spacer onto 54553 or 54554 Rotor.

2. Place a .002" Shim into 01478 Front Bearing plate as an initial spacing. Then slip 02649 Bearing into 01478 Front Bearing Plate. Press

assembly onto rotor.

3. Check the clearance between rotor and bearing plate by using a .001" feeler gauge. Clearance should be at .001" to .0015". Adjust clearance by

repeating steps 1-3 changing shims as required.

4. Once proper rotor gap clearance is achieved, install lubricated blades into rotor slots, (use 95842 Dynabrade Air Motor Oil or equivalent).

5. Install 01476 Cylinder so it rests against the 01478 Front Bearing Plate, (make sure inlet holes of cylinder line up with inlet holes in 02676

Rear Bearing Plate).

6. Press 02696 Bearing into 02676 Rear Bearing Plate. Press this assembly onto rotor. 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 end so it will turn freely while still maintaining a snug fit. A loose fit will not

achieve the proper preload or motor bearings. Next, place a small amount of grease on the 02696 Bearing and stick 02679 Shield against the bearing.

7. Secure housing in vise using 52296 Repair Collar or padded jaws so that motor cavity points upward.

8 Install motor assembly into housing, making sure motor drops all the way into housing.

Note: Align the rear bearing plate node with the notch inside the housing.

9. Slip 01547 Insulator Collar over 53152 Gear Case.

10. Apply Loctite

#567 to threads, and screw 53152 Gear Case onto motor housing. Torque to 28 N•m/250 in. lbs.

11. Press front 54520 Bearing onto front end of 50786 or 50787 Planetary Carrier.

12 Hold planetary carrier in a soft jaw vise and apply one drop of #271 Loctite

Torque to 17 N•m/150 in. lbs.

13. Install planetary gears and 54472 Gear Shafts onto planetary housing.

14. Slip 54468 Ring Gear over gears making sure that notches in ring gear will align with lock screw and grease fitting in 53152 Gear Case once planetary

gear assembly is installed.

15. Press rear 54520 Bearing onto 50786 or 50787 Planetary Carrier, until the outer race of the bearing touches the ring gear.

16. Slip the complete planetary gear assembly into 53152 Gear Case and install 50784 Lock Screw.

17. Install 50781 Rear Exhaust Cover onto 53152 Gear Case. Torque to 28 N•m/250 in. lbs.

18. Lubricate planetary gears through 53152 Gear Case Grease Fitting with two plunges every 50 hours of use for maximum gear life.

19. Install arbor assembly.

Motor Assembly Complete.

to the threads of 50782 Adapter. Install adapter onto planetary carrier.

(continued on next page)