Disassembly Instructions - 1 Hp Extension Type 1 Wheel Grinder
Important: Manufacturer’s warranty is void if tool is disassembled before warranty expires.
Disconnect tool from power source before tool repair.
Motor Disassembly:
1.
Remove
96511
Hex Nut and slide off
51964
Flange Washer, abrasive wheel, and
51963
Backup Flange.
2.
Remove wheel guard assembly.
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.
Apply wrench at wrench flats on
51952
Extension Handle and remove from housing.
5.
Slide
51982
Bearing Spacer and spindle assembly through rear of
51952
Extension Handle.
6.
Remove
96512
Retaining Ring from front of extension handle and remove
51956
Felt Seal.
7.
Secure
51955
Spindle at wrench flats, and remove spindle adapter and
51935
Coupling.
8.
Secure
01007
Bearing and press
51955
Spindle through both
01007
Bearings.
9.
Secure
54520
Bearing and press
51955
Spindle through
54520
Bearing.
10.
Remove
96498
Wave Spring from housing assembly.
11.
Pull motor assembly from housing assembly, and remove
53620
Motor Adapter with
95438
O-Ring.
12.
Remove governor assembly by using a slotted screw driver. (
LEFT HAND
thread)
13.
Secure
51925
Cylinder and place a 1/8" (3 mm) drift pin to the base of the internal thread and press the
51921
Rotor from the
02057
Rear Bearing.
14.
Slide
02057
Rear Bearing from
51923
Rear Bearing Plate.
15.
Remove
51925
Cylinder and
51926
Blades.
16.
Secure
51921
Rotor in a soft (aluminum or bronze jaw) vise and remove
51935
Coupling (twist counterclockwise).
17.
Slide
51922
Front Bearing Plate and
51927
Rotor Spacer from
51921
Rotor.
18.
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
51937
Inlet Bushing (twist counterclockwise).
3.
Remove
51943
Spring,
96442
O-Ring,
51940
Spacer and
51939
Silencer Plate from
51937
Inlet Bushing.
4.
Remove
51941
Spring,
51942
Baffle,
51944
Tip Valve and
51945
Valve Seat.
Disassembly Complete.
Assembly Instructions - 1 Hp Extension Type 1 Wheel Grinder
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
51935
Coupling onto rotor shaft to 17 N•m (150 lbs.-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 steps 8 & 9 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, maintain 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 lbs.-in.).
(Continued on next page)