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DISASSEMBLY/ASSEMBLY INSTRUCTIONS
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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 tool.
Use only genuine ARO replacement parts for this tool. When
ordering, specify part number, description, tool model number
and serial number.
GEARING DISASSEMBLY
Clamp tool in a smooth face vise, clamping on inlet adapter
(2).
Unthread and remove ring gear (22) and components from
tool using a wrench on flats of ring gear.
Remove spindles and gears from ring gear.
Remove lock nut (27) releasing washer (26), bearings (24)
and spacers (25 and 23).
Do not remove gear (19) from carrier assembly unless dam-
age is evident. Gear is press fit onto carrier assembly.
GEARING ASSEMBLY
Assemble spacer (23) and one bearing (24) into ring gear
(22) pressing on outer race of bearing.
Coat shafts of spindle(s) with ARO 33153 grease.
Assemble gears to shafts of spindle(s).
Assemble carrier assembly (18) to spindle assembly (21).
Lubricate sets of gears liberally with ARO 33153 grease
(approximately 1/32 oz. per reduction).
Assemble spindle(s) and gearing into ring gear. Rotate
spindle and gears to align gear teeth with splines of ring gear.
Assemble spacer (25) and bearing (24) into ring gear, press-
ing on outer race of bearing.
Assemble wave washer (26) to ring gear.
Assemble lock nut (27) to spindle, securing components.
Assemble ring gear and components to tool and tighten, using
a wrench on flats of ring gear.
Assemble spacer (28) to tool.
MOTOR DISASSEMBLY
Remove gearing from tool.
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Remove spacer (15) and “0” ring (14).
Tap front edge of housing to remove motor assembly. Locat-
ing pin (16) should also come out.
Grasp cylinder in one hand and tap splined end of rotor (9) with
a soft face hammer; motor will come apart.
Remove end plate (8) and bearing (7) from rotor.
MOTOR ASSEMBLY
Pack bearing (7) with ARO 33153 grease and assemble to
end plate (8), pressing on outer race of bearing.
Assemble end plate (8) to rotor, pressing on inner race of bear-
ing.
Coat five rotor blades (10) with ARO 29665 spindle oil and as-
semble to rotor slots - straight side out.
Coat i.d. of cylinder (11) with ARO 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 (8).
Assemble bearing (13) to end plate (12) pressing on outer
race of bearing.
Assemble end plate (12) to rotor, pressing on inner race of
bearing. Be sure rotor turns without binding.
Insert locating pin (16) into .081” 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 (16).
Grease and assemble “0” ring (14) to end plate (12).
Assemble spacer (15) to motor, with counterbore facing mo-
tor.
Assemble gearing to tool.
HOUSING DISASSEMBLY
Clamp air inlet adapter (2) in a smooth face vise.
Unthread housing (6) with a strap type wrench.
Remove diffuser washer (3) exhaust cap (4) and two fillers
(5).
THROTTLE ASSEMBLY
Install two fillers (5) to exhaust cap (4).
Assemble exhaust cap (4) diffuserwasher (3) and inlet adapt-
er (2) to housing.
Clean and replace screen (1) in inlet adapter.
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