Disassembly/Assembly Instructions
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.
Angle-head Disassembly:
1.
Disconnect tool from power source. Remove abrasives from tool.
2.
Insert tool into padded vise with spindle facing upward.
3.
Remove
50384
Spindle Bearing Cover with a pin wrench (left hands threads).
4.
Pull spindle assembly from housing.
5.
Remove
52089
Washer,
52088
Spacer and
52120
Shim from spindle assembly.
6.
Grip onto bevel gear and remove spindle nut (right hand threads). Remove
50412
Felt Ring and
50431
Bearing.
7.
Press gear from spindle.
8.
Press
50424
Bearing Washer and
12152
Bearing from angle housing by using a push pin thru access hole in top of angle housing.
9.
Remove
50511
Screws (2) from housing and
07149
Clamp. Disassemble muffler assembly.
10.
Reposition angle housing in vise so motor housing is facing upwards.
11.
Slide back
50383
Collar to expose
50381
Lock Nut.
12.
Loosen lock nut from angle housing (left hand threads).
13.
Separate
01295
Valve Body/Motor Housing from angle housing.
Motor Disassembly:
1.
Remove
50381
Lock Nut from
01295
Valve Body/Motor Housing (right hand threads).
2.
Pull motor assembly from valve body.
3.
Press
50379
Rotor from
02649
Rear Bearing and
01722
Rear Bearing Plate.
4.
Remove cylinder and blades.
5.
Clamp
50379
Rotor in padded vise with
50363
Pinion facing up and unscrew pinion from rotor.
6.
Remove
50332
Pinion Spacer,
01007
Bearings (2),
50368
Bearing Plate and
01010
Spacer from rotor.
Valve Body Disassembly:
1.
Position valve body in padded vise with air inlet facing up.
2.
Remove air fitting by securing
01494
Inlet Adapter with a wrench and twist air fitting from inlet adapter.
Important: 01494
Inlet Adapter must be secured before attempting to remove air fitting to avoid damaging valve body housing.
3.
Remove
53190
Block Plate and
95375
O-ring.
4.
Using needle nose pliers, remove
01468
Spring,
01472
Tip Valve and seal.
5.
Using a 2.5mm drift pin, tap
01017
Pin from housing and remove throttle lever.
6.
Remove
95558
Retaining Ring using retaining ring pliers.
7.
Push
01247
Regulator from valve body housing and remove o-rings.
Disassembly complete.
Valve Body Reassembly:
1.
Insert
01247
Speed Regulator Assembly with O-rings into valve body. Secure with
95558
Retaining Ring.
2.
Secure valve body in padde vise with air inlet facing upwards.
3.
Insert
01464
Seal into housing.
4.
Line up hole in valve stem with hole in housing (looking past brass bushing). Insert
01472
Tip Valve so that the metal pin passes through the hole in the
valve stem. Install
01468
Spring (small end towards tip valve).
5.
Lubricate
95375
O-ring with a slight amount of air-tool oil and install into
53190
Block Plate.
6.
Install
53190
Block Plate (O-ring side first) into housing.
7.
Apply Hernon #940 PST Pipe Sealant to threads of
01494
Inlet Adapter and install valve body (torque 34 N•m/200 in. - lbs.).
8.
Install
57334
Throttle Lever and
01017
Pin.
Motor Reassembly:
1.
Place
50379
Rotor in padded vise with threaded spindle facing upward.
2.
Slip
01010
Spacer onto rotor shaft.
3.
Place a .002" Shim into
50368
Bearing Plate as an initial spacing (
Note: 01121
Shim Pack contains .001" and .002" Shims). Slip
01007
Bearings (2)
into bearing plate.
4.
Slip bearings and bearing plate onto rotor shaft. Place
50332
Pinion Spacer onto outer race of bearing.
5.
Tighten pinion thru pinion spacer onto rotor shaft (torque 17 N•m/150 in. - lbs.).
6.
Check clearance between rotor and bearing plate using a .001" feeler gauge. Clearance should be at .001" to .0015". Adjust clearance by repeating steps
1-5 with different shims if necessary. Remove rotor from vise.
7.
Once proper rotor gap clearance is achieved, install well lubricated
01185
Blades (4) into rotor slots. Dynabrade recommends using their
95842
Dynabrade Air Lube.
8.
Install cylinder over rotor. Be sure air inlet holes of cylinder face away from
50368
Bearing Plate.
(continued on next page)
3
