Page 1
SECTION
ARO.
OPERATOR’S MANUAL
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE
PAR-A-MATIC® SELF-FEED DRILLS
MANUAL
Released: 8/9O
Revised: 11-20-98
Form:
Models 8255-A( )-( ) and 8355A( )-( )
IMPORTANT: READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
M103
11
1612-2
OPERATING AND SAFETY PRECAUTIONS
l
Keep hands and clothing away from rotating end of tool.
l
Wear suitable eye protection while operating tool.
l
Disconnect air supply from tool before removing/installing bit
or performing other maintenance procedures.
ROUTINE LUBRICATION REQUIREMENTS
Lack of or an excessive amount of lubrication will affect the performance and life of this tool. Use only recommended lubricants at
below time intervals:
EVERY 8 HOURS OF TOOL OPERATION - Fill air line lubricator
reservoir of recommended F.R.L. with spindle oil (29665).
EVERY 180 HOURS OF TOOL OPERATION - Inject NLGI #1
“EP” grease (33153), 1 to 2 strokes, thru grease filling in gear
housing. NOTE: Spindle must be extended from outer sleeve suf-
ficiently to expose grease fitting in gear housing. Gearing should
contain approximately 1/8 oz. (3.5 g) of grease per set of gears.
AIR SUPPLY REQUIREMENTS
For maximum operating efficiency, the following air supply specifications should be maintained to this air tool:
l
AIR PRESSURE - 90 PSIG (6 bar)
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AIR FILTRATION - 56 micron
. LUBRICATED AIR SUPPLY
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HOSE SIZE - 5/16” (8 mm) I.D.
An ARO® model C28221-810 air line FILTER/REGULATOR/LUBRICATOR (F.R.L.) is recommended to maintain the above air
supply specifications.
MOUNTING
The nose end of the outer sleeve (43) is provided with 2” - 16 L.H.
threads (remove thread guard [49] for use) and a 2” x 1-1/8” long
pilot diameter for fixture mounting. Foot and flange type mounting
brackets are available for tool mounting.
RECOMMENDED LUBRICANTS
After disassembly is complete, all pans, except sealed or shielded
bearings, should be washed with solvent. To relubricate parts, or
for routine lubrication, use the following recommended lubricants:
Where Used
Air Motor
“0” Rings 8 Lip Seals 36480
Gears and Bearings 33153
29665
1 qt. Spindle Oil
4 oz. Stringy Lubricant
5 lb. "EP" - NLGI #1 Grease
SET-UP PROCEDURE
WARNING: Keep clear of rotating end of unit with hands and/or
clothing. Keep fingers/hands from being pinched between housing or valves and adjustment screws and/or trip bracket.
l
Loosen two screws (31) and remove cover (1).
l
Allow a minimum distance of 1/4" between the drill point of the
unit and the workpiece (this is necessary for the air motor to
start and reach free speed before the drill point touches the
workpiece).
0
Determine the TOTAL STROKE LENGTH the drill must travel
to perform the drilling operation - see illustration below.
0
Loosen jam nut (8) and turn adjustment screw "A” so the distance between the end of the screw and the stud (28) equals
the Total Stroke Length.
0
lighten jam nut (8).
l
Loosen jam nut (8) and turn adjustment screw ”B" (valve-it+
head models only) so the distance between the end of the
screw and the button bleed valve (27) is slightly GREATER
than the distance set for adjustment screw “A,.
l
Start and let unit advance until the adjustment screw “A".
makes contact with the stud (28).
l
Carefully, and be aware that the unit is going to retract, turn the
adjustment screw “B" until it depresses the button bleed valve
(27) enough to cause the unit to retract.
l
Tighten jam nut (8).
l
See “FEED RATE CONTROL VALVES”, page 2.
For parts and service information, contact your local ARO distributor, or the Customer Service Dept. of the Ingersoll-Rand Dis-
tribution Center, White House, TN at PH: (615) 672-0321, FAX: (615) 672-0801.
ARO Tool Products
Ingersoll-Rand Company
1725 U.S. No. 1 North
©1998 THE ARO CORPORATION l
P .O. Box 8000 l Southern Pines, NC 28388-8000
PRINTED IN U.S.A.
Page 2
FEED RATE CONTROL VALVES
REMOTE OPERATION
Turn valve (24) marked “R” on top of housing, approximately
l
1-1/2 turns counterclockwise (open).
Turn the other valve (24) marked “F" on top of housing, clock-
l
wise until closed (do not tighten too snugly).
Start the unit and slowly turn valve (24) marked “F", counter-
l
clockwise (open) until the desired forward rate of feed is
reached.
A final adjustment of the rate of return (retract) can be made
l
with the valve (24) marked “R” on housing.
MANUAL OPERATION
Install button bleed valve (27) in either the “F" port located at
l
top of valve housing or the “F" port located at the rear of valve
housing. NOTE: Unused port must be plugged with pipe plug
(22).
Depress button bleed valve (27) marked “F" on valve housing.
l
The unit will start in the forward (advancing) mode and continue to feed forward until the adjusting screw “B” has depressed
bleed valve (27) marked “R” to retract the unit. See set-up
procedure.
A manual emergency retract button bleed valve (27) can be
l
installed in “R” port at top of valve housing if desired. This
valve can be used to immediately retract the unit in case of
misaligned part or other emergency. Valve not furnished.
RECOMMENDED POWER AIR INLET SYSTEM
Install a pressure bleed valve - ARO part number 9600 - in
valve port marked “F" at either the top or rear of valve housing
Connect pressure bleed valve - using 1/8” i.d. tubing - to a remote operated valve which, when actuated, feeds air pressure to the pressure bleed valve. Pressure bleed valve will
bleed the air from "F" port of valve housing causing spool
valve in housing to shift to the forward feed position, thus starting the forward stroke of the unit.
Install a pressure bleed valve - ARO part number 9600 - in
valve port marked “R” at the top of the valve housing and connect - using 1/8” i.d. tubing -to a remote MANUALLY operated valve. This valve is used as an emergency retract in case
of a part misalignment or such only as the unit, when properly
set-up and applied, will automatically retract and return to the
start position. See set-up procedure.
Refer to page 10 for plumbing and schematic diagrams.
SPECIAL NOTE: The air inlet and remote ports of valve housing
have tapered pipe threads and should not require the use of
thread sealants, such as sealant tape or pipe joint compounds.
Thread sealants, when used improperly, can contaminate air passages and cause valve or unit to malfunction.
Your ARO self-feed tool is designed to deliver specific horsepower and thrust to achieve high rates of work. To assure the unit will develop this power, care must be
that the power air inlet system is correctly sized to permit the proper rate of air flow. Shown is a system for a single tool that will supply correct delivery. IMPORTANT
tool is power rated when 90 p.s.i. is present at the tool during operation.
Shown below is the same system in schematic form.
SUPPLY
If two or three units are to be installed, each unit should be supplied with a system like that shown below or use a system like that above for each tool.
1/4” CAPACITY
3/8” CAPACITY
1/4” CAPACITY
F = FILTER
R = REGULATOR
L = LUBRICATOR
FILTER MODEL 25231-110
REGULATOR MODEL R27231-100
LUBRICATOR MODEL L26221-110
‘-the
taken
Page 3
SET-UP PROCEDURE WITH OPTIONAL HYDRAULIC CHECK
Assemble hydraulic check to mounting bracket and assemble
mounting bracket to tool, using washers (30997) and cap
screws (Y157-44).
Measure distance from drill point to work piece - distance “Y".
Distance “X” between hydraulic check plunger and trip bracket must be less than distance “Y" to prevent damage to drill
point when it approaches the work piece.
Loosen the cap screws (Y15744) and position hydraulic
check to obtain correct setting for distance “X”.
Tighten cap screws (Y157-44) securely before operating unit.
Increase the air flow thru the feed control valve marked “F" by
opening two (2) full turns from closed position. This will allow
drill to advance rapidly until the trip bracket contacts plunger of
hydraulic check.
The hydraulic feed rate adjustment is located at the nameplate end of the hydraulic check. Rotate extended spindle until
FEED BATE ADJUSTMENT
the slot on the spindle is located midway between the highest
and the lowest settings.
l
Start the drill unit and the drill will advance at a rapid rate until
the trip bracket contacts plunger of hydraulic check.
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Slowly rotate the hydraulic feed rate counterclockwise for faster feed rate or clockwise for slower feed rate
TO CONTROL BREAKTHROUGH
Position hydraulic check so the distance between the plunger
l
and the trip bracket (distance "X”) is less than the distance
from the drill point to the opposite side of the work piece (distance "W").
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M103
11
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.
l
Use correct tools and fixtures when servicing this tool.
l
Don’t damage “0” rings when servicing this tool.
l
Use only genuine ARO replacement parts for this tool. When
ordering, specify part number, description, tool model number
and serial number.
GEARING DISASSEMBLY
Remove chuck from gearing.
Thread adjustment screws (6 and 7) all the way back and
push the piston rod (51) all the way forward to expose wrench
flats of motor housing (52) from the outer sleeve (43).
Using wrenches on flats of ring gear and motor housing, un-
thread gearing from motor housing.
If tool has double gearing, unthread ring gear (87) from adapt-
er (78).
DIRECT DRIVE models: Unthread and remove bearing lock
nut (113).
Grasp ring gear in one hand and tap threaded end of the
spindle with a soft face hammer; spindle and components will
loosen from ring gear.
Remove bearing(s) and shafts from spindle to remove gears.
To remove bearings (89) from ring gear, remove lock nut (90).
48044-1 GEARING DISASSEMBLY
SEE PAGE 11 FOB HYDRAULIC CHECK DIMENSIONAL DATA.
Using wrenches on flats of ring gear and motor housing, un-
thread gearing from motor housing.
Pull spindle (100) and components from ring gear (102).
Remove bearing (70) and spacer (99).
Remove shafts (81). releasing gears (82).
Remove retaining ring (101), releasing shafts (72) and gears
(73 and 75).
Remove lock nut (90) from ring gear, releasing bearings (89)
and spindle (104).
GEARING ASSEMBLY
Assemble gears to spindle and secure with shafts.
Align notch in end of shaft with step on spindle (align notch of
shaft with spacer for auxiliary gearing). NOTE: Be sure each
shaft (72) contains 15 needle bearings.
Pack bearings with ARO 33153 grease and assemble spacer
(71) and bearing (70) to spindle.
Lubricate gears of spindle liberally with ARO 33153 grease
and assemble spindle to ring gear.
Pack bearings (89 or 110) with ARO 33153 grease and as-
semble to spindle with the ‘unmarked” faces of bearings facing
each other (identification markings on beatings facing out).
Assemble seal (91) to lock nut (90) and secure bearings (89)
with lock nut.
DIRECT DRIVE models: Assemble bearing lock nut (113) to
spindle.
Assemble spindle nut (92) to spindle.
Assemble gearing to tool.
Assemble chuck (117) to spindle.
Remove chuck from gearing.
Thread adjustment screws (6 and 7) all the way back and
push the piston rod (51) all the way forward to expose wrench
flats of motor housing (52) from the outer sleeve (43).
48044-1 GEARING ASSEMBLY
Pack bearings (89) with ARO 33153 grease and assemble to
spindle (104).
3
Page 4
DISASSEMBLY/ASSEMBLY INSTRUCTIONS
Lubricate needle bearing (103) with ARO 33153 grease and as-
semble to spindle (104) and assemble spindle to ring gear (102).
Assemble seal (91) to lock nut (90) and assemble lock nut to
ring gear, securing bearings and spindle.
Assemble spindle nut (92) to spindle.
Assemble gears (82) to spindle, securing with shafts (81).
Assemble spacer (99) and bearing (70) to spindle, securing
shafts.
Assemble gears (73 and 75) to spindle, securing with shafts
(72) and retaining ring (101). NOTE: Be sure each shaft contains 15 needle bearings.
Lubricate gears liberally with ARO 33153 grease and assemble spindle to ring gear.
Assemble gearing to tool.
Assemble chuck (117) to spindle.
MOTOR DISASSEMBLY
Remove gearing from tool as previously outlined.
Remove spacer (88) and motor assembly from housing.
Remove cap (54) and shield (55).
Grasp cylinder in one hand and tap splined end of rotor with a
soft face hammer; motor will come apart.
MOTOR ASSEMBLY
Assemble bearing (56) to end plate (57), pressing on outer
race of bearing.
Assemble end plate (57) to rotor, pressing on inner race of
bearing.
Coat i.d. of cylinder (61) with ARO 29665 spindle oil and assemble cylinder to end plate (57), aligning roll pin in cylinder
with hole in end plate.
Coat blades (59 or 66) with ARO 29665 spindle oil and insert
into rotor slots - straight side out.
Assemble bearing (63) to end plate (62), pressing on outer
race of bearing.
Assemble end plate (62) to cylinder, pressing on inner race of
bearing.
Be sure rotor does not bind (if rotor binds, tap splined end of
rotor lightly to loosen).
Assemble shield (55) and cap (54) to end plate (57).
Assemble motor and spacer (68) to motor housing.
Assemble gearing to tool.
AIR PISTON DISASSEMBLY
Remove gearing and motor assembly as outlined.
Remove cover (1) adapter (3) washer (4) and trip bracket (5).
Place valve housing in a suitable holding device with the outer
sleeve in an upright position.
Using a strap wrench on outer sleeve (43), unthread (L.H.
threads) and CAUTIOUSLY remove outer sleeve straight up
and off from valve housing to prevent bending of air cylinder
(37) and damaging the inside diameter.
Handle the air cylinder (37) with care so its fine cylindrical
shape is not distorted in any manner.
If the air cylinder remains inside the outer sleeve when the
sleeve is removed, push the piston rod (51) forward then pull it
backward. The cylinder will then extend from the sleeve and
can now be removed.
Remove “0” ring (33) and retaining ring (34).
Push piston rod and motor housing out thru gear end of outer
sleeve. Piston (36) will drop out when motor housing and pis-
ton rod are removed from outer sleeve.
Insert a suitable rod thru gear end of outer sleeve and push
muffler cap (41) out thru valve end of outer sleeve.
Piston rod (51) and motor housing (52) are secured with a hard
drying thread adhesive. If it should become necessary to sepa-
rate these two parts, heat the threaded area lightly to soften the
adhesive and unthread the rod from the housing (R.H. threads).
AIR PISTON ASSEMBLY
NOTICE: When a part containing “0” rings has been removed
from the tool, it is recommended that the “0” rings be replaced
with new ones when reassembling the part to the tool. Lubricate
all “0” rings with ARO 36460 “0” ring lubricant.
Assemble retaining ring (38) “0” ring (39), “0” ring (40) and
screen (42) to muffler cap (41).
Assemble muffler cap (41), screened end first, to outer sleeve
(43) from end of sleeve with internal threads. Push muffler cap
into sleeve until it bottoms against step in sleeve.
Coat torque pin (44) with grease to retain pin in place and assemble inside outer sleeve in hole provided.
Assemble “0” ring (50) to piston rod.
Assemble motor housing and piston rod to outer sleeve thru
end of sleeve with external threads and push piston rod thru
muffler cap, using care not to damage “0” ring (39) contained
in muffler cap. Align slot in motor housing with torque pin (44).
Assemble seals (35) to piston (36), with lips of seals facing
away from each other.
Assemble piston (36) to piston rod (51) and push piston on rod
until it seats against “0” ring (50) and step on rod.
Assemble retaining ring (34) to groove in piston rod, securing
piston on rod.
Assemble “0” ring (33) to piston rod and slide on rod until it
seats against retaining ring (34).
Clamp valve housing (10) in a suitable holding device, with the
threaded end of housing upright.
Coat i.d. of air cylinder (37) with “0” ring lubricant 36460 and
place air cylinder on valve housing (10) over "0" ring (30).
Using care not to damage “0” rings (11) contained in housing,
insert piston rod (51) thru housing and carefully locate outer
sleeve over air cylinder and thread sleeve to housing. Tighten
securely using a strap wrench.
Assemble motor, gearing, trip bracket and components and
assemble cover (1) to housing.
VALVE HOUSING DISASSEMBLY
The valve body (14), feed control valves (24) and button bleed
valves (27) can be serviced without removing outer sleeve from
valve housing. To gain access to check valves (17) and components or “0” rings (11), follow disassembly procedure for removing the air piston.
Remove both caps (12) and “0” rings (13) - models 8255-A-( )
only.
Push valve body (14) out thru housing. Handle valve body
with reasonable care so the o.d. of valve is not damaged.
Button bleed valves (27) need not be removed except for replacement.
VALVE HOUSING ASSEMBLY
Replace all “0” rings with new ones.
Lubricate “0” rings (15) with 36460 lubricant and assemble to
valve body - models 8255-A-( ) only.
Assemble valve body to housing and assemble caps (12)
with “0” rings (13), to housing.
If check valve(s) (17) have been removed, assemble “0"
ring(s) (16) to valve(s) and assemble valve(s) to housing.
Assemble spring(s) (18) to housing.
Assemble “0” ring (20) to screw plug (21) and assemble to
housing.
Assemble screw plug (19) to housing - models 8255A-( ) only
Assemble outer sleeve and components to housing as described in air piston assembly section.
Assemble “0” rings (23) to needle valves (24) and assemble
needle valves to housing.
Assemble plate (25) to housing, securing with screws (26).
4
Page 5
93
33835-1 GEARING ASS’Y
M103
11
3.4:1 RED.
98
* ASSEMBLE WITH THREAD ADHESIVE SUCH AS LOCTITE 242.
34009-1 GEARING ASSY
48044-1 GEARING ASS’Y
I
I
Page 6
.
6
79
33853-1 GEARING ASS’Y
Page 7
M103
11
* ASSEMBLE WITH THREAD ADHESIVE SUCH AS LOCTITE 242.
24 26
25
7
Page 8
PART NUMBER FOR ORDERING
1
Cover
models 8255-A( )-1 and 8355-A( )-1 . .
models 8255-A( )-2 and 8355-A( )-2 . .
models 8255-A( )-3 and 8355-A( )-3 . .
2
Pipe Plug ...........................
3
Adapter ............................
Lock Washer.. ......................
4
5
Trip Bracket
models 8255-A( )-( )
models 8355-A( )-()
6
Adjustment Screw “A"
................
................
models 8255-A()-1, -2 and 8355-A()-1, -2 . .
models 8255-A( )-3 and 8355-A( )-3 . .
7
Adjustment Screw “B”
models 8255-A( )-1
models 8255-A( )-2, -3
.................
..............
Nut (2 req’d on models 8255-A)
Pipe Nipple
models 8255-A( )-1 and 8355-A( )-1 . .
models 8255-A( )-2 and 8355-A( )-2 . .
models 8255A( )-3 and 8355-A( )-3 . .
Valve Housing
10
models 8255-A( )-1 , -2
models 8255-A( )-3
..............
.................
models 8355A( )-1, -2..
models 8355-A( )-3
11
“0” Ring (3 req’d)
Cap (2 req’d) (models 8255-A only) ....
12
“0” Ring (2 req’d) (models 8255-A only)
13
14
Valve Body (models 8255-A only)
“0” Ring (5 req’d) (models 8255-A only)
15
16
“0” Ring (2 req’d on models 8255-A)
17
Check Valve (2 req’d on models 8255-A)
Spring (2 req’d on models 8255-A)
18
19
Screw Plug (models 8255-A only)
20
“0" Ring ............................
.................
....................
Screw Plug .........................
Pipe Plug (2 req’d)
22
...................
“0” Ring (2 req’d on models 8255-A)
24
Needle Valve (2 req’d on models 8255-A)
Plate.. .............................
26
Cap Screw (2 req’d)
27
Button Bleed Valve (2 req’d) (models 8255-A only)
28
Stud ...............................
29
"O" Ring ............................
“O" Ring.. ..........................
30
31
Screw (2 req’d) ......................
32
Washer (2 req’d) .....................
..................
Housing and Valve Assembly
(includes items 10 thru 32)
models 8255-A( )-1, -2
models 8255-A( )-3
.............
................
(includes items 10, 11, 16, 17, 18, 20 thru
26 and 28 thru 32)
models 8355-A( )-1, -2
.............
models 8355-A( )-3 ................
“0” Ring
Retaining Ring
34
Seal (2 req’d)
35
Piston..
36
Air Cylinder
37
............................
......................
........................
............................
models 8255-A( )-1 and 8355-A( )-1 . .
models 8255-A( )-2 and 8355-A( )-2 . .
models 8255-A( )-3 and 8355-A( )-3 . .
Retaining Ring ......................
38
39
“0” Ring.. ..........................
“0” Ring
40
Muffler Cap
41
42
Screen .............................
............................
.........................
8
.......
............
......
......
.....
...
...
40313-1
40313
40313-2
Y227-2-L
44883
Y14-616
41713-3
41713-1
40292-2
48292-3
40292-1
40292-2
Y11-4-C
40857-5-2
40857-6-2
40857-7-2
40305
40805
41299-1
41299-2
Y325-15
46697
Y325-14
40307
41083
Y325-2
39587
35733
39652
Y325-3
38863
Y227-2-L
Y325-7
48441-1
Y211-1
24130
46558
Y325-129
Y325-29
Y154-19
Y14-4
40814-1
40814-2
41302-1
41302-2
41535
Y145-23
38860
38867-1
38866-1
38866
38866-2
35619
Y325-20
Y325-30
38865
38866
PART NUMBER FOR ORDERING
Outer Sleeve
models 8255-A( )-1 and 8355-A( )-1 . .
models 8255-A( )-2 and 8355-A( )-2 . .
models 8255-A( )-3 and 8355-A( )-3 . .
44
Torque Pin ..........................
45
Muffler .............................
46
Manifold (includes items 47 and 48)
47
Set Screw
48
“0’ Ring (2 req’d)
49
Thread Guard
50
“0” Ring (2 req’d)
51
Piston Rod
..........................
....................
.......................
....................
models 8255-A( )-1 and 8355-A( )-1 . .
models 8255-A( )-2 and 8355-A( )-2 . .
models 8255-A( )-3 and 8355-A( )-3 . .
52
Motor Housing
models 8255-A( )-1, -2 and 8355-A( )-1 , -2
models 8255-A( )-3 and 8355-A( )-3 . .
53
“O” Ring
cap
55
Shield ..............................
56
Bearing .............................
57
End Plate
58
Rotor
59
Blade (4 req’d)
60
Roll Pin (2 req’d)
61
Cylinder (includes item 80)
End Plate
iti
Bearing .............................
64
Motor Assembly .....................
............................
................................
...........................
...............................
......................
.....................
...........................
Rotor.. .............................
z
Blade (5 req’d) ......................
87
Motor Assembly .....................
68
Spacer .............................
Spacer
E
Bearing .............................
71
Spacer .............................
72
Shaft (2 req’d) (includes 15 needle
.............................
bearings per shaft) ..................
73
Gear (2 req’d) 12 teeth
74
Spindle .............................
75
Drive Gear (9 interior - 17 exterior teeth)
76
Spacer
77
Bearing
78
Adapter
79
Gearing Assembly (3.4:1 reduction)
80
Spacer .............................
81
Shaft (2 req’d)
.............................
.............................
............................
.......................
Gear (2 req’d) 18 teeth
Ei
Spindle .............................
84
Spacer .............................
85
Gearing Assembly (5.56:1 reduction)
86
Spindle
67
Ring Gear (includes item 88)
68
Grease Fitting
89
Bearing (2 req’d)
90
Lock Nut ............................
91
Seal ...............................
92
Spindle Nut .........................
93
Gearing Assembly (3.4:1 reduction)
Spindle
zi
Gearing Assembly (5.56:1 reduction)
96
Gear (2 req’d) 17 teeth
97
Spindle .............................
98
Gearing Assembly (6.86:1 reduction)
99
Spacer
IO0
Spindle
101
Retaining Ring ......................
102
Ring Gear (includes item 88)
103
Needle Bearing
104
Spindle
I05
Gearing Assembly (1.635:1 reduction) . .
.............................
.......................
.............................
.............................
.............................
......................
.............................
...............
...............
.....................
...............
............
..........
..........
....
....
...
....
...
...
. .
t
40753
40318
40806
40312-1
43551-3
43590
Y23-102
43588
38869
Y325-16
40754-1
4031 0-1
40807-1
40319
40808
Y325-222
38783
38805
Y65-7
37956
30745
30741
Y178-22
37958
31158
Y65-15
37959-1
31633
31363
37960-1
32310
32305
32325
37676
33686
30899
37667
30901
32314
32325
38892
33853-1
38694
33436
33440
33425
32312
33837-1
38888
38882
35967
48305-1
38250
38895
38893-1
33835-1
38889
33836-1
33438
38890
34009-1
48052-1
48048-1
Y145-21
48053-1
48051-1
48046-1
48044-1
Page 9
PART NUMBER FOR ORDERING
106
Shaft (2 req’d)
Splined Driver
107
108
Spindle
109
Ring Gear (includes item 88)
110
Bearing (2 req’d)
111
Lock Ring ...........................
112
113
114
115
116
117
...............................
Seal
Bearing Lock Nut
..............................
Collet
Collet Nut ...........................
Gearing Assembly (1:1 reduction)
Chuck ..............................
.......................
.......................
.............................
.....................
....................
..........
......
M103
11
30765
32833
39934
39984
34682
38719
38720
38718
31812-8
38721
39940
33907
QTY
4
5
2
1
2
2
5
1
1
1
1
1
PART NO.
30741
31363
35733
38783
38860
40309
41083
41535
41795
41799
41954
Y65-7
NUMBER
SERVICE KIT NO. 41325
DESCRIPTION QTY
Blades
Blades
Spring
Cap
Seal
Gasket
“0” Ring
“0” Ring
Motor Oil
Gear Lube
“0” Ring
Bearing
1
2
1
2
2
2”
1
1
1
1
Y325-129
1
Y325-222
PART NO.
Y65-15
Y325-2
Y325-3
Y325-7
Y325-14
Y325-15
Y325-16
Y325-20
Y325-29
Y325-30
DESCRIPTION
Bearing
“0” Ring
“0” Ring
“0” Ring
“0” Ring
“0” Ring
“0” Ring
“0” Ring
“0” Ring
“0” Ring
“O” Ring
“0” Ring
MODELS WITH -EU SUFFIX ARE “EC” COMPLIANT MODELS.
9
Page 10
BASIC REMOTE CONTROL FOR START
AND EMERGENCY RETRACT FUNCTIONS
MODEL 8255A( )( )
Remote operation of the unit may be achieved by connecting a S-way valve to the remote start and/or remote retract ports, as shown above.
TO START - Depress the remote button momentarily. The unit will advance the drill to a pre-set depth and automatically retract to the initial position, whereupon the unit will stop.
EMERGENCY RETRACT - Depress the emergency button momentarily. This signal to the unit will shift the built-in pressure operated valve. commanding the unit to retract
immediately to the initial position. whereupon the unit will stop.
NOTE: Manual Start and Emergency Retract buttons on the tool are fully operational even when remote control is used. The manually operated buttons can be used when
set-up is required.
Shown below is the same system in schematic form.
SUPPLY
SUPPLY
MODEL 8355-A( )-( )
l
PACKAGED 10 TO A BOX
REMOTE OPERATION
Remote operation is achieved by connecting a 4-way valve to the remote start and remote retract ports, as shown above. This valve supplies power directly to the feed piston in
me tool.
TO START - Move lever forward. The unit will advance to a pm-set depth (adjustment screw contacts stud on valve housing).
TO RETRACT - Move lever rearward (back). The unit will retract lo the initial position.
EMERGENCY RETRACT -The unit will retract at any time the lever is moved to the rearward (back) position. The motor runs continuously as long as air pressure is present at
the air inlet to the toot. A shut-off valve should be installed in the air inlet line to completely shut the tool off in case of an emergency.
Shown below is me same system in schematic form.
10
Page 11
TROUBLE SHOOTING
LISTED BELOW ARE SOME OF THE MOST COMMON CAUSES FOR THE SELF-FEED DRILL TO MALFUNCTION. MALFUNCTIONS BEYOND THE SCOPE OF THIS
MANUAL SHOULD BE BROUGHT TO THE ATTENTION OF YOUR ARO REPRESENTATIVE OR RETURN THE TOOL TO THE FACTORY FOR REPAIR.
M103
11
CONDlTlON
FAILURE TO FEED
OR IRREGULAR OR
ERRATIC FEED.
LOW SPEED OR
MOTOR FAILS TO
OPERATE
MOTOR CONTINUES
TO RUN AFTER RETRACTION.
FAILURE TO RE-
TRACT
POSSIBLE CAUSE
1. INADEQUATE AIR SUPPLY.
2. FEED CONTROL VALVES IMPROPERLY ADJUSTED.
3. AIR LEAK AROUND CAP (12).
4. DIRT OR DAMAGED “0” RINGS ON
SPOOL VALVE (14).
5. CLOGGED AIR PASSAGE IN VALVE
HOUSING.
1. INADEQUATE AIR SUPPLY.
2. CLOGGED AIR PASSAGE IN VALVE
HOUSING.
1. PISTON NOT FULLY RETRACTED.
2. DAMAGED “0” RING (11) INSIDE
VALVE HOUSING.
I. IMPROPER ADJUSTMENT OR ALIGN-
MENT BETWEEN ADJUSTMENT
SCREW AND BUTTON BLEED VALVE.
2. FEED CONTROL VALVES (24) IM-
PROPERLY ADJUSTED OR DIRTY.
1. AIR LEAK AROUND CAP (12).
1. DAMAGED “0” RINGS IN MUFFLER
CAP, VALVE HOUSING OR SPOOL
VALVE OR SEALS ON PISTON.
i. CLOGGED AIR PASSAGE IN VALVE
HOUSING.
CORRECTIVE ACTION
1. CHECK AIR SUPPLY FOR CORRECT REGULATOR ADJUSTMENT (90 P.S.I.G. MAX. WHEN TOOL IS OPERATING).
2. REFER TO “SET-UP PROCEDURE”, PAGE 1.
3. CHECK FOR DAMAGE TO “0” RING. CHECK AND BE SURE
CAPS ARE PROPERLY TIGHTENED.
4. REFER TO VALVE SECTION, PAGE 4, AND REMOVE SPOOL
VALVE. INSPECT, CLEAN AND REPLACE “0” RINGS.
5. REMOVE VALVE HOUSING FROM TOOL. DISASSEMBLE AND
BLOW ALL AIR PASSAGES CLEAR OF DEBRIS.
1. CHECK AIR SUPPLY FOR CORRECT REGULATOR ADJUSTMENT.
2. REMOVE VALVE HOUSING FROM TOOL. DISASSEMBLE AND
BLOW ALL AIR PASSAGES CLEAR OF DEBRIS.
1. BE SURE PISTON IS NOT OBSTRUCTED AND IS RETURNED
ALL THE WAY BACK.
2. REMOVE VALVE HOUSING FROM TOOL. REPLACE “0” RINGS.
I. REFER TO “SET-UP PROCEDURE”, PAGE 1.
2. CHECK ADJUSTMENT, REFER TO PAGE 2. REMOVE, INSPECT
AND CLEAN.
L CHECK FOR DAMAGE TO “0” RING. CHECK AND BE SURE
CAPS ARE PROPERLY TIGHTENED.
1. DISASSEMBLE, INSPECT AND REPLACE “0” RINGS AND/OR
SEALS.
i. REMOVE VALVE HOUSING FROM TOOL. DISASSEMBLE AND
BLOW ALL AIR PASSAGES CLEAR OF DEBRIS.
ACCESSORIES
--
11
Page 12
DIMENSIONAL DATA
8255-A()-1
8355A()-1
17-13/32"(442mm) 18-29/32"(480 mm) 22-29/32"(582 mm)
A
3-19/64"(84mm)
B
l-19/64"(33mm)
C
"D"
F
H 2-1/32(52mm) l-9/32"(33mm) 1-9/32"(33mm)
"M" 9-1/16"(23O mm) lO-9/16"(268mm) 12-9/16" (319mm)
N
0
P
Q .985"(25mm) .965"(25mm) 1.985"(50mm)
14-7/8"(378mm) 16-3/8" (416mm) 20-3/8"(1518mm)
E
G
I
J
K
L
49/64"(19mm)
11/64"(4mm) 59/64" (23 mm)
16-9/64"(4lOmm) 17-41/64"(443mm) 21-41/64"(550mm)
l/32" (.8 mm)
17/29/64"(443mm) 18-61/64"(481mm) 22-61/64"(583mm)
3-11/32"(85mm)
l-23/64"(35mm) 19/32"(15mm) 19/32"(15mm)
l-11/16"(43mm) l-11/16'(43mm)
1-3/8"(35mm)
3-5/8" (92 mm)
8255-A()-2
8255-A()3
8355-A()-2 8355A()-3
2-34/64"(65mm)
35/64"(14mm)
l/64" (.4mm)
47/64"(19mm)
2-19/32"(66mm)
l-9/16"(40mm)
4-3/8"(111 mm)
2-35/64"(65mm)
35/64"(14mm)
l/64" (.4mm)
59/64"(23mm)
23/32"
(18mm)
2-19/32(66mm)
I
2-ll/l6"(68mm)
l-9/16-(40mm)
5-3/8"(137mm)
825542&0,8355428-()
8255-A50-0,8355-ASO-()
825=54),8355-W)
8255-A&0,8355-A&0
825,A14-(),835CA14-()
PN 49999-077
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