ARO 50 Series Operator's Manual - Page 5

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DISASSEMBLY/ASSEMBLY

INSTRUCTIONS

Never apply excessive

pressure by a holding device which

may cause distortion of a part.

Apply pressure evenly to parts which have a press fit.

Apply even pressure to the bearing race that will be press

fitted to the mating part.

Use correct tools and fixtures when servicing this tool.

Don't damage "0" rings when servicing this motor.

Use only genuine AR0

replacement

parts for this motor.

When ordering, specify part number, description, model num-

ber and serial number.

GEARING

DISASSEMBLY

Remove nut (36) from spindle.

Unthread and remove ring gear (31) and components

from

motor.

Remove spindle assembly (29).

Do not disassemble

further unless damage is evident.

Heat adapter (37) lightly and remove.

To remove bearings and spacers from ring gear, press on

spacer (32) from inside splined end of ring gear.

GEARING

ASSEMBLY

Assemble spacer (32) and one bearing (33) to ring gear (31).

NOTE: Press on outer race of bearing.

Coat shafts of spindle (29) with AR0 33153 grease and as-

semble gears (27), containing needle bearings (28) to shafts.

Lubricate gears liberally with AR0 33153 grease (approxi-

mately l/8 oz.).

Assemble spindle to ring gear, aligning gear teeth with splines

of ring gear.

Assemble spacer (34) and bearing (33) to ring gear. NOTE:

Press on outer race of bearing.

Assemble wave washer (35) to ring gear.

Assemble nut (36) to spindle, securing components.

Apply a good grade thread adhesive (such as Loctite 271) to

internal threads of adapter (37) and assemble to ring gear.

Assemble spacer (26) to ring gear and assemble ring gear to

motor.

MOTOR DISASSEMBLY

Remove gearing from motor.

Remove spacer (26) and "0" ring (30).

Tap front edge of housing to remove motor assembly (40). Lo-

cating pin (25) should also come out.

Grasp cylinder in one hand and tap splined end of rotor with a

soft face hammer; motor will come apart.

Remove end plate (18) and bearing (17) from rotor.

MOTOR ASSEMBLY

Pack bearing (17) with AR0 33153 grease and assemble to

end plate (18), pressing on outer race of bearing.

Assemble

end plate (18) to rotor, pressing on inner race of

bearing.

Coat five rotor blades (20) with AR0 29665 spindle oil and as-

semble to rotor slots - straight side out.

Coat i.d. of cylinder (22) with AR0 29665 spindle oil and as-

semble over rotor. NOTE: Air inlet slots in end of cylinder must

be aligned with two air inlet holes in end plate (18).

Assemble

bearing (24) to end plate (23), pressing on outer

race of bearing.

Assemble

end plate (23) to rotor, pressing on inner race of

bearing. Be sure rotor turns without binding.

Insert locating pin (25) into .096" diameter blind hole at bottom

of motor cavity in housing.

Align notches of end plates and cylinder and install motor into

housing, aligning notches with locating pin (25).

Lubricate and assemble O-ring (30) to End Plate (23).

Assemble spacer (26) and gearing to motor.

THROTTLE

DISASSEMBLY

Clamp air inlet adapter (2) in a smooth face vise.

Unthread housing (9) with a strap type wrench.

Remove washer (3), diffuser (4) muffler housing (5) two fillers

(6), spring (7) and valve rod (8). CAUTION: Do not remove or

adjust rubber portion of valve rod (8), as it is preset at the facto-

ry. However, if air leakage occurs due to wear, unscrew rubber

portion of valve rod NOT more than one complete turn (coun-

terclockwise).

Remove throttle pin (16) and spring (15).

Remove screen (1) from inlet adapter.

THROTTLE

ASSEMBLY

Install spring (15) and throttle pin (16) into housing, aligning

slot in throttle pin with air inlet holes in housing.

Install valve rod assembly (8) into housing. NOTE: Throttle pin

(16) should not pull out when throttle rod (8) is seated properly.

Install two fillers (6) to muffler housing (5).

Install muffler housing (5) to housing, aligning lever (11) with

throttle pin (16).

Assemble spring (7) into housing.

Assemble

diffuser (4) and washer (3) to housing, securing

with inlet adapter (2).

Clean and replace screen (1) in inlet adapter.