Disassembly Instructions - 1 Hp Slow Speed Extension Die Grinder
I
mportant: Manufacturer’s warranty is void if tool is disassembled before warranty expires. Please refer to parts complete tool
assembly for part identification.
Disconnect tool from power source before tool repair.
Motor Disassembly:
1.
Remove
50012
Collet Cap and collet insert.
2.
Using
51989
Repair Collar or padded vise, secure front end of housing using machined flats on the silver ring.
3.
Remove
51952
Extension Handle from
53695
Gear Casing (turn counterclockwise).
4.
Slide
51982
Bearing Spacer and spindle assembly through rear of
51952
Extension Handle.
5.
Remove
96512
Retaining Ring from front of extension handle and remove
51956
Felt Seal.
6.
Secure
51955
Spindle at wrench flats, and remove
50011
Collet Body and
51935
Coupler.
7.
Secure
01007
Bearing and press
51955
Spindle through both
01007
Bearings.
8.
Secure
54520
Bearing and press
51955
Spindle through
54520
Bearing.
9.
Remove
53695
Gear Casing (twist counterclockwise).
10.
Secure planetary carrier using
53698
Wrench (
order separately
) and remove
51953
Coupling (turn counterclockwise).
11.
Remove
04014
Set Screw(s) and pull planetary carrier assembly(s) from planetary gear casing.
12.
Press planetary carrier assembly through
54520
Bearing.
13.
Remove
96498
Wave Spring.
14.
Remove ring gear and press retainer pins and gears from planetary carrier.
15.
Remove remaining tool assembly from vise.
16.
Pull motor assembly from housing assembly.
17.
Remove governor assembly by using a slotted screw driver (
LEFT HAND
thread, turn counterclockwise).
18.
Secure
51925
Cylinder and place a 1/8" (3 mm) drift pin to the base of the internal thread and press the rotor from the
02057
Rear Bearing.
19.
Slide
02057
Rear Bearing from
51923
Rear Bearing Plate.
20.
Remove
51925
Cylinder and
51926
Blades.
21.
Press rotor through
54520
Bearing,
51922
Front Bearing Plate and
51927
Rotor Spacer.
22.
Slide
54520
Bearing and shims from
51922
Front Bearing Plate.
Motor Disassembly Complete.
Housing Disassembly:
1.
Secure housing using
51989
Repair Collar (
see back cover for Optional Accessories
).
2.
Remove inlet bushing with muffler assembly (turn counterclockwise).
3.
Remove
53682
Gasket,
51943
Spring,
96442
O-Ring,
51940
Spacer,
94528
Felt Silencer,
53686
Muffler Cap,
94924
Wave Spring and
53683
Spacer
from
53681
Inlet Bushing.
4.
Remove
51944
Tip Valve and
51945
Valve Seat.
5.
Remove housing and
51989
Repair Collar and lay collar on bench with flange facing down so it is supporting throttle lever. Place a 3/32" (2.4 mm)
drift pin on
96444
Pin and tap pin thru housing.
6.
Remove
51946
Valve Stem Assembly.
7.
Remove
96443
O-Ring from
51946
Valve Stem Assembly.
Housing Disassembly Complete.
Assembly Instructions - 1 Hp Slow Speed Extension Die Grinder
Motor Assembly:
Important:
Be sure parts are clean and in good repair before assembling. Follow grease, oil and torque specifications.
1.
Place rotor into padded vise with spline 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.
Press bearing/bearing plate assembly onto rotor, torque
51935
Extension Coupler 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. Clarence should be between .001" – .0015".
Adjust clearance by repeating steps 4 and 5 with different shims if necessary.
7.
Once proper rotor gap clarence is achieved, install well lubricated
51926
Blades (4) into rotor slots. Dynabrade recommends lubricating blades
with
95842
Air Lube.
8.
Install
51925
Cylinder over rotor and front plate raised boss. Align coiled pin on front 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 apply 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.
(continued on next page)
5
