ARO AG054A Manuale dell'operatore - Pagina 8

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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 tool.

Use only genuine ARO replacement parts for this tool. When

ordering, specify part number, description, tool model number

and serial number.

CLUTCH

DISASSEMBLY

Clamp tool in a smooth face vise- pistol grip models, clamp on

handle (28) - straight models, clamp on inlet adapter (20.

Using a strap type wrench, remove clutch housing (105) -

LEFT HAND THREADS.

Remove clutch assembly from tool. NOTE: Springs (82 and

83) are loose parts and may fall out.

Clamp a 1/4" hex wrench in a vise then place bit holder (100)

and clutch assembly on it.

Remove snap ring (84).

Using a 7/8" wrench, remove adjustment nut (85).

Remove adjustment washer (86) and clutch spring (87).

Remove retaining rings (88).

Slide off guide (89) spring (90) ball sleeve (91) thrust race

(92) and thrust bearing (93). NOTE: Removal of ball sleeve

(91) releases six balls (97).

Remove thrust race (94) releasing six balls (98).

Remove retaining ring (103) then rotate bit holder to remove

twelve balls (99). Separate bit holder (100) and spindle (96)

releasing eleven balls (99).

CLUTCH

ASSEMBLY

For clutch part lubrication, use ARO 40036-1 grease on parts

as pointed out in this section.

Assemble thrust race (115) and wave washer (114) to clutch

housing (105) where applicable.

Lubricate ball grooves of clutch spindle (96).

Install eleven balls (99) into groove.

Slide spindle (96) into bit holder (100) securing balls.

Assemble twelve bails (99) into bit holder, then secure with re-

taining ring (103).

Lubricate ball pockets of bit holder and install six balls (98) into

pockets, securing with thrust race (94).

Lubricate and assemble thrust bearing (93) and thrust race

(92) to spindle.

Coat plunger (95) with spindle oil 29665 and assemble spring

(83) to plunger. Assemble plunger and spring to spindle, se-

curing with balls (97). NOTE: Assemble two balls per hole.

Secure balls with ball sleeve (91).

Assemble spring (90) and guide (69) to spindle, securing with

retaining rings (86).

Install clutch spring (87).

Lubricate face of adjustment washer (86) and install on

spindle.

Thread adjustment nut (85) onto spindle, securing with snap

ring (84).

Lubricate ball (101) of bit holder.

Assemble spring (82) into spindle. NOTE: Assemble spring

(82) with large diameter into spindle first.

Assemble clutch assembly to tool.

Assemble clutch housing (105) to tool - LEFT HAND

THREADS.

See "Clutch Adjustment".

CLUTCH

ADJUSTMENT

EXTERNAL:

Rotate sleeve (108) until opening in housing is visible.

Depress bit to engage clutch, then rotate until notch in adjust-

ment washer (86) is visible.

Insert a no. 1 Phillips screwdriver in notch to turn gear teeth on

nut (85).

_ Clockwise = decrease torque.

_ Counterclockwise = increase torque.

INTERNAL:

Remove clutch housing, bit holder and clutch assembly from

tool. NOTE: Clutch housing has left hand threads.

With bit in bit holder, clamp bit in vise.

Place clutch assembly on bit holder.

Engage jaws, hold clutch assembly from turning then rotate

adjustment nut (85) with a 7/8" wrench.

GEARING

DISASSEMBLY

Remove clutch from tool (see "Clutch Disassembly").

Using a wrench on flats, remove ring gear (67 or 81).

Remove snap ring (71) and washer (70).

Remove spindle(s) and gears from ring gear (67 or 81).

NOTE: Keep gears grouped with mating spindle when disas-

sembling double reduction gearing.

Do not remove bearing (69) and spacer (68) unless damage is

evident.

To remove bearing (69) and spacer (68) from ring gear, press

on spacer (68) from inside splined end of ring gear.

Do not remove gears (62, 72 and 76) from carrier assembly

unless damage is evident. Gears are press fit onto carrier as-

sembly.

GEARING

ASSEMBLY

Assemble spacer (66) into ring gear.

Press bearing (69) into ring gear. NOTE: Press on outer race

of bearing and press to shoulder of ring gear.

Coat shafts of spindle with ARO 33153 grease.

Assemble gears to shafts of mating spindle.

Assemble carrier assembly to spindle assembly of double re-

duction gearing.

Assemble spindle(s) and gearing into ring gear. Rotate

spindle and gears to align gear teeth with splines of ring gear.

Thread ring gear (67 or 81) to tool and tighten with a wrench on

flats.

Assemble clutch to tool.

MOTOR DISASSEMBLY

Remove clutch and gearing from tool.

Remove spacer (60) and "0" ring (59).

Tap front edge of housing to remove motor assembly. Locat-

ing pin should also come out.

Tap drive end of rotor (52) with a soft face hammer; motor will

come apart. NOTE: Bearings are light press fit in end plates.

Bearing (51) is press fit on rotor.

Remove end plate (50 or 57) and bearing (51) from rotor.

MOTOR ASSEMBLY

Lubricate bearing (51) with ARO 33153 grease and assemble

to end plate (50 or 57) pressing on outer race of bearing.

Assemble end plate (50 or 57) to rotor, pressing on inner race

of bearing.