Disassembly Instructions - 1 Hp Cut-Off Extension Tool
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 first
50296
Cut-Off Flange and abrasive, then remove the second
50296
Cut-Off Flange.
2.
Remove Guard Assembly.
3.
Secure housing using
51989
Repair Collar (
see back cover for Optional Accessories
).
4.
Apply wrench at wrench flats on
51952
Extension Handle to remove
51952
Extension Handle 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
51950
Spindle Adapter and
51935
Coupler.
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.
11.
Pull motor 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 using
96209
Motor Repair Clamp (
order separately
) 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.
14.
Slide
02057
Rear Bearing from
51923
Rear Bearing Plate.
15.
Remove
51925
Cylinder and
51926
Blades.
16.
Secure
51921
Rotor in a padded vise and remove
51935
Extension Coupler (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 (
see back cover for Optional Accessories
).
2.
Remove inlet bushing (twist 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 repair collar on bench with flange facing down so the collar is supported by throttle lever. Place a
3/32" (2.4mm) drift pin on
96444
Pin and tap pin thru housing.
6.
Remove
51946
Valve Stem Assembly. Remove
96443
O-Ring from
51946
Valve Stem Assembly.
Housing Disassembly Complete.
Assembly Instructions - 1 Hp Cut-Off Extension Tool
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 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. Add one drop of Loctite
®
#243 (or equiv.) to 51921 Rotor 3/8"-24 male thread, and screw, torque
51935
Extension Coupler onto rotor shaft. Torque to 17 N•m (150 lbs.-in.).
6.
Check clearance between rotor and front bearing plate by using a .001" feeler gauge. Clarence should be between .001" – .0015". Adjust clarence 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 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. To correct alignment flip cylinder end to end and repeat
steps 8 & 9 for correct assembly.
(continued on next page)
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