Disassembly Instructions - 1 hp Vacuum Die Grinders
Disassembly/Assembly Instructions - 1Hp/Straightline/ Rear Exhaust/Vacuum Die Grinders.
Important: The Dynabrade Pneumatic Power Tool Lifetime Warranty Policy does NOT cover normally wearable parts and products. Before servicing
this tool please contact Dynabrade Inc. or a Dynabrade Subsidiary for information regarding the Dynabrade Pneumatic Power Tool Lifetime
Warranty Policy. Notice: Special repair tooling referred to in these instructions can be ordered from Dynabrade. (See Page 8)
Disconnect the die grinder from the air supply.
Motor Disassembly:
1.
Loosen the clamp and remove the shroud.
2.
Remove
50012
Collet Cap and collet insert.
3.
Secure front end of housing in a soft (aluminum or bronze jaw) vise, align the vise jaws with machined flat on the silver ring.
4.
Using
50971
Pin Wrench (
order separately
) or an adjustable pin wrench, remove
51961
Housing Cover.
5.
Remove remaining assembly from vise.
6.
Remove
96498
Wave Spring.
7.
Pull Motor Assembly from housing assembly, and remove
53620
Motor Adapter with
95438
O-Ring.
8.
Remove Governor Assembly by using a slotted screw driver. (
LEFT HAND
thread)
9.
Secure
51925
Cylinder and place a 1/8" (3mm) drift pin to the base of the internal thread and press the
51921
Rotor from the
02057
Rear Bearing.
10.
Slide
02057
Rear Bearing from
51923
Rear Bearing Plate.
11.
Remove
51925
Cylinder and
51926
Blades.
12.
Secure
51921
Rotor in a soft (aluminum or bronze jaw) vise and remove
50011
Collet Body (twist counterclockwise).
13.
Slide
51922
Front Bearing Plate and
51927
Rotor Spacer from
51921
Rotor.
14.
Slide
54520
Bearing and shims from
51922
Front Bearing Plate.
Motor Disassembly Complete.
Housing Disassembly:
1.
Secure housing using
51989
Repair Collar (
order separately–see back cover for Optional Accessories
).
2.
Remove
53681
Inlet Bushing (twist counterclockwise).
3.
Remove
51944
Tip Valve and
51945
Valve Seat.
Disassembly Complete.
Assembly Instructions - 1 hp Vacuum Die Grinders
Motor Assembly:
Important:
Be sure parts are clean and in good repair before assembling. Follow grease, oil and torque specifications.
1.
Place
51921
Rotor into a padded vise with male thread facing upwards.
2.
Slip
51927
Rotor Spacer over rotor shaft and down against rotor body face.
3.
Press
96441
Coiled Pin into
51922
Front Bearing Plate. Make certain, coiled pin does not protrude beyond internal bearing surface.
4.
Place a .002" Shim into the base of
51922
Front Bearing Plate as an initial spacing and slide
54520
Bearing to the front plate base.
Note: 51951
Shim Pack contains .001" and .002" Shims.
5.
Slip bearing/bearing plate assembly onto rotor, torque
50011
Collet Body onto rotor shaft to 17 N•m (150 lb.-in.).
6.
Check clearance between rotor and front bearing plate by using a .001" feeler gauge. Clearance should be between .001" - .0015". Adjust clearance by
repeating steps 4 and 5 with different shims if necessary.
7.
Once proper rotor gap clearance is achieved, install well lubricated
51926
Blades (4) into rotor slots. Dynabrade recommends lubricating blades with
95842
Air Lube.
Important:
Make certain beveled edge of blade follows rotor outside diameter.
8.
Install
51925
Cylinder over rotor and front plate raised boss. Align coiled pin on front plate to cylinder slot.
9.
Press
96441
Coiled Pin into blind hole on
51923
Rear Bearing Plate. Press (2)
96445
Coiled Pins into the back side of rear bearing plate.
10.
Peel backing off
51924
Gasket and align it firmly in place onto
51923
Rear Bearing Plate.
11.
Place
51923
Rear Bearing Plate over rotor mandrel and insert raised boss on rear bearing plate into cylinder diameter, while inserting short coiled pin
into cylinder slot. Be sure inlet slot on rear bearing plate line up with inlet slot on cylinder. Flip cylinder end to end and repeat step 8 for
correct assembly.
12.
Press
02057
Bearing onto rotor and into
51923
Rear Bearing Plate hole until it is seated.
Important:
While pressing
02057
Bearing, make certain to
contact inner race of bearing. Cylinder must fit snug between bearing plates. If too tight, rotor will not turn freely. Rotor must be lightly tapped at press fit
end until rotor spins freely while still maintaining a snug fit. A loose fit will not achieve the proper preload on motor bearings.
13.
Add one drop of Loctite
®
243 (or equiv.) to governor assembly male thread and screw governor assembly into place (
LEFT HAND
thread) with a slotted
screw head. Torque to 2 N•m (18 lb.-in.).
14.
Install motor assembly into housing, making sure motor drops all the way into housing.
Note:
Align both
96445
Coiled Pins to slots in insert and against
51924
Gasket.
15.
Install
95438
O-Ring onto
53620
Adapter and slide adapter into housing and over
54520
Bearing.
16.
Place
96498
Wave Washer onto
53620
Adapter.
17.
Apply a small amount of Loctite
®
567 to housing thread, and install
51961
Housing Cover using
50971
Pin Wrench (
ordered separately
) or an
adjustable pin wrench. Torque cover to 35 N•m (310 lb.-in.).
18.
Install collet insert and
50012
Collet Cap.
19.
Install the shroud and secure it with the clamp.
Motor Assembly Complete.
(continued on next page)
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