ARO DR051B series User manual

Tool Products
OPERATOR’S MANUAL
INCLUDING:OPERATION,INSTALLATION& MAINTENANCE
SECTION M22
MANUAL 75
Released: 6-16-69
Revised: 6-1-95
50 SERIES RIGHT-ANGLE DRILLS
Models: DR051B-( )-( )-( ) and DR053B-( )-( )-( ).
Form: 3362-2
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
FAILURE TO OBSERVE THE FOLLOWING WARNINGS COULD RESULT IN INJURY.
Pneumatic tools should always be installed and used in accor-
dance with A.N.S.I. B186.1 “Safety Code For Portable Air Tools.” Repeated prolonged operator exposure to vibrations which may
be generated in the use of certain hand-held tools may produce
Raynaud’s phenomenon, commonly referred to as Whitefinger
disease. The phenomenon produces numbness and burning
sensations in the hand and may cause circulation and nerve dam-
age as well as tissue necrosis. Repetitive users of hand-held
tools who experience vibrations should closely monitor duration
of use and their physical condition.
l
Operate this tool at 90 p.s.i.g. (8.2 bar) maximum air pressure
at the air inlet of the tool.
l
Disconnect air supply from tool before removing/installing bit,
socket or device attached to tool or performing maintenance
procedures.
l
Keep hands, clothing and long hair away from rotating end of
tool.
l
Anticipate and be alert for sudden changes in motion during
start up and operation of any power tool.
l
Never exceed rated r.p.m. of tool.
l
Wearsuitable eye and hearing protection while operating tool.
l
Tool shaft can continue to rotate briefly after throttle is re-
leased.
l
Donot lubricate tools with flammable orvolatile liquids such as
kerosene, diesel or jet fuel.
l
Do not remove any labels. Replace any damaged label.
l
Use only accessories recommended by ARO.
l
The use of other than genuine ARO replacement parts may
result in safety hazards, decreased tool performance and in-
creased maintenance and may invalidate all warranties.
l
ARO is not responsible for customer modification of tools for
applications on which ARO was not consulted.
l
Tool maintenance and repair should be performed by autho-
rized, trained, competent personnel. Consult your nearest
ARO authorized servicenter.
l
It is the responsibility of the employer to place the information
in this manual into the hands of the operator.
For parts and service information, contact your local ARO distributor, or the Customer Service Dept. of the Ingersoll-Rand Distribution
Center, White House, TN at PH: [phone], FAX: [phone].
ARO Tool Products
Ingersoll-Rand Company
1725 U.S. NO.1 North l P.O. Box 8000 l SouthernPines, NC 28388-8000
©1995 THE ARO CORPORATION. PRINTED IN U.S.A.
Part of worldwide Ingersoll-Rand

FAILURETO OBSERVETHE FOLLOWINGWARNINGSCOULDRESULTIN INJURY.
Wear eye protection when
operating or performing
maintenance on this tool.
Turn off air supply and disconnect
air supply hose before installing,
removing or adjusting any
accessory on this tool, or before
performing any maintenance on
this tool.
Air powered tools can vibrate in
use. Vibration, repetitive motions
or uncomfortable positions may
be harmful to your hands and
arms. Stop using any tool if
discomfort, tingling feeling or
pain occurs. Seek medical advice
before resuming use.
Do not carry the tool by the hose.
Do not overreach when operating
this tool. Keep body stance
balanced and firm.
NOTICE
PN 48178-1 LABEL PN 49883 LABEL
(NON-EU MODELS) (-EU MODELS)
This label must appear on the tool at all times. If It is
lost or damaged, a replacement label Is available at
no cost.
Wear hearing protection when
operating this tool.
Operate at 90 p.s.i.g.
(6.2 bar/620 kPa)
maximum air pressure.
WARNING = Hazards or unsafe practices which could result in severe personal injury, death or substantial
property damage.
CAUTION = Hazards or unsafe practices which could result in minor personal injury or product or property
damage.
NOTICE = Important installation, operation or maintenance information.
3

ROUTINE- LUBRICATION REQUIREMENTS
M22
75
Lackof oran excessive amount of lubrication will affect the perfor-
mance and life of this tool. Use only recommended lubricants at
below time intervals:
EVERY 8 HOURS OF TOOL OPERATION - Fill lubricator reser-
voir of recommended F.R.L.with spindle oil (29665). Ifan in line or
air line lubricator is not used, apply several drops of spindle oil
(29665) in air inlet.
EVERY 160 HOURS OF TOOL OPERATION - Lubricate gear-
ing. Pack bearings, coat shafts and lubricate gears with NLGI #1
“EP” grease (33153). Gearing should contain approximately 3/64
oz. (1.3 g) of grease for single reduction and 1/16 oz. (1.8 g) of
grease for double reduction. Right-angle assembly should con-
tain approximately 1/8 oz. (3.5 g) of grease.
AIR SUPPLY REQUIREMENTS
Formaximum operating efficiency, the following air supply specifi-
cations should be maintained to this air tool:
l
AIR PRESSURE - 90 p.s.i.g. (6.2 bar)
l
AIR FILTRATION - 50 micron
l LUBRICATED AIR SUPPLY
l
HOSE SIZE - 5/16” (8 mm) I.D.
An ARO@model C28231-810 air line FILTER/REGULATOR/LU-
BRICATOR (F.R.L.) is recommended to maintain the above air
supply specifications.
RECOMMENDED LUBRICANTS
Afterdisassembly iscomplete, all parts, except sealed orshielded
bearings, should be washed with solvent. To relubricate parts, or
for routine lubrication, use the following recommended lubricants:
Where Used ARO Part # Description
Air Motor 29665 1 qt. Spindle Oil
“O” Rings & Lip Seals 36460 4 oz. Stringy Lubricant
Gears and Bearings 33153 5lb.“EP”- NLGI#1Grease
INSPECTION,MAINTENANCE AND INSTALLATION
Disconnect air supply from the tool or shut off air supply and ex-
haust (drain) line of compressed air before performing mainte-
nance or service to the tool.
It is important that the tools be serviced and inspected at regular
intervals for maintaining safe, trouble-free operation of the tool.
Be sure the tool is receiving adequate lubrication, as failure to lu-
bricate can create hazardous operating conditions resulting from
excessive wear.
Tool maintenance and repair shall be performed by authorized,
trained, competent personnel. Tools, hose and fittings shall be re-
placed if unsuitable for safe operation and responsibility should
be assigned to be sure that all tools requiring guards orother safe-
ty devices shall be kept in legible condition. Maintenance and re-
pair records should be maintained on all tools. Frequency of
repair and the nature of the repairs can reveal unsafe application.
Scheduled maintenance by competent authorized personnel
should detect any mistreatment or abuse of the tool and worn
parts. Corrective action should be taken before returning the tool
for use.
Disassembly should be done on a clean work bench with a clean
cloth spread to prevent the loss of small parts. After disassembly
is completed, all parts should bethoroughly washed in aclean sol-
vent, blown dry with air and inspected for wear levels, abuse and
contamination. Double sealed or shielded bearings should never
be placed in solvent unless a good method of m-lubricating the
bearing is available. Open bearings may be washed but should
not be allowed to spin while being blown dry.
Upon reassembling, lubricate parts where required. Use 33153
grease, or equivalent, in bearings, Use 36460 lubricant for “O”
ring assembly. When assembling “O” rings or parts adjacent “O”
rings, care must be exercised to prevent damage to the rubber
sealing surfaces. A small amount of grease will usually hold steel
balls and other small parts in place while assembling.
When replacement parts are necessary, consult drawing contain-
ing the part for identification.
Always use clean, dry air. Dust, corrosive fumes and/or excessive
moisture can damage the motor of an air tool. An air line filter can
greatly increase the life of an air tool. The filter removes rust,
scale, moisture and other debris from the air lines. Low air pres-
sure (less than 90 p.s.i.g.) reduces the speed of the air tool. High
air pressure (more than 90 p.s.i.g.) raises performance beyond
the rated capacity ofthe tool and could cause injury. Shown below
is a typical piping arrangement.
MAIN LINES 3 TIMES
AIR TOOL lNLET SIZE
TOOL
BRANCH LINE 2 TIMES
AIR TOOL INLET SIZE
COMPRESSOR
DRAIN REGULARLY
Besure that the air supply lines and connectors are of proper size
to provide a sufficient quantity of air to the tool.
3

RIGHT-ANGLE
DR051B-125-( )-( ) 12,500 46470 48227-1 1:1
DR053B-27-()- () 2700 46470 48227-1 6.67:1 ITEM 67
DR053B-41-() 4100 46454 48226-1 4.40:1 (LIGHT DUTY)
DR053B-52-() 5200 46454 48226-1 3.43:1
MODELSWITH-EU SUFFIXARE “EC” COMPLIANTMODELS.
DISASSEMBLY/ASSEMBLY INSTRUCTIONS
l Never apply excessive pressure by a holding device which
may cause distortion of a part.
l
l
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
l
Use correct tools and fixtures when servicing this tool.
l
Don’t damage “O” 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.
RIGHT-ANGLE DISASSEMBLY
(REGULAR DUTY)
Remove chuck (75) where applicable.
Using wrenches on flats of ring gear and lock nut (47), un-
thread and remove right-angle section from tool - LEFT
HAND THREADS.
Todisassemble drive section, remove lock nut (74) from hous-
ing - LEFT HAND THREADS.
Remove lock nut (48) - LEFT HAND THREADS.
DONOT disassemble further unless damage is evident. To
disassemble, pull pinion (54) from housing.
RIGHT-ANGLE ASSEMBLY
(REGULAR DUTY)
Lubricate bearings upon assembly.
_ Assemble bearing (53) and spacer (52) to pinion (54), secur-
ing with snap ring (51). NOTE: Bearing is to be located .600"
from shoulder on pinion (see illustration, next column).
_ Assemble bearing (50) to pinion. NOTE: Press on inner race
of bearing.
4 Assemble pinion and components to housing (55). NOTE: Press on outer race of bearing.
_ Assemble lock nut (48) to housing, securing bearing - LEFT
HAND THREADS.
_ Apply approximately 1/8 oz. (3.5 g) of grease to right-angle
gearing upon assembly.
_ Assemble drive assembly (76 or 77) to lock nut (74).
_ Assemble lock nut and components to housing -LEFT HAND
THREADS.
_ Assemble lock nut (47) to housing, securing with snap ring
(46).
_ Assemble coupling (45) to pinion and assemble right-angle
housing and components to tool, securing with lock nut (47) -
LEFT HAND THREADS.
RIGHT-ANGLE DISASSEMBLY
(LIGHT DUTY)
_ Using wrenches on flats of ring gear and lock nut (47), un-
thread and remove right-angle section from tool - LEFT
HAND THREADS.
_ Todisassemble right-angle section, grasp housing (65) lightly
in a vise. Using a wrench on flats of body (60), unthread body
from housing - LEFT HAND THREADS.
,

DISASSEMBLY/ASSEMBLY INSTRUCTIONS
DO NOT remove pinion from housing unless damage is evi-
dent. To remove pinion, grasp pinion in avise and tap housing
with a soft face hammer.
Unthread and remove lock nut (48) -LEFT HAND THREADS
- releasing bearing (59).
To disassemble drive assembly, unthread lock nut (82) -
LEFT HAND THREADS -and pull drive assembly from hous-
ing (65). DO NOT disassemble further unless damage is evi-
dent. NOTE: Drive assembly contains 22 small balls which will
fall out if drive assembly is disassembled.
RIGHT-ANGLE ASSEMBLY
(LIGHT DUTY)
Lubricate bearings upon assembly.
Assemble bearing (79) and gear (78, 83, 88 or 90) to shaft
(80).
Assemble gear and components to lock nut (82), securing
balls (81) in groove in gear.
Assemble lock nut (82) to housing (85) - LEFT HAND
THREADS.
Assemble bearing (59) to body, securing with lock nut (48) -
LEFT HAND THREADS.
Assemble bearing (63) to pinion (64).
Assemble pinion to housing (65).
Assemble housing to body (60) to seat needle bearing. Un-
thread and remove body. NOTE: Bearing (63) is to be located
.525” from end of housing (65) (seeillustration, below).
Assemble shims (61 and 62) and lock nut (47) to body,
Assemble housing (65) to body (60) - LEFT HAND
THREADS.
Assemble coupling (58) to pinion and assemble right-angle
section to tool, securing with lock nut (47) - LEFT HAND
THREADS,
GEARING DISASSEMBLY
Remove right-angle section from tool.
Remove ring gear (24 or 30) using a wrench on flats.
Remove snap ring (29) and washer (28) where applicable.
Remove spindle(s) and gears from ring gear. NOTE: Keep
gears grouped with mating spindle when disassembling
double reduction gearing.
Do not remove bearing (27) or spacer (26) unless damage is
evident.
To remove bearing (27) and spacer (26) from ring gear, press
on spacer (26) from inside splined end of ring gear.
Do not remove gears (35 or 38) from carrier assemblies un-
less damage is evident. Gears (35 and 38) are press fit onto
carrier assemblies.
GEARING ASSEMBLY
Assemble spacer (26) and bearing (27) 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 and bearings (33)to shafts of mating spindle.
Assemble carrier assembly to spindle assembly for models
with double reduction gearing.
M22
75
Lubricate sets of gears liberally with ARO 33153 grease (see
“Routine Lubrication Requirements”, page 3).
Assemble spindle(s) and gearing into ring gear. Rotate
spindle(s) and gears to align gear teeth with splines of ring
gear.
Assemble washer (28) and snap ring (29) to spindle, where
applicable.
Thread ring gear (24 or 30) to tool, tightening with wrench on
flats.
Assemble right-angle section to tool.
MOTOR DISASSEMBLY
Remove right-angle section and gearing from tool.
Remove spacer (22) and “O” ring (21).
Tap front edge of housing to remove motor assembly. Locat-
ing pin (23) should also come out.
Tapdrive end of rotor with a soft face hammer; motor will come
apart. NOTE: Bearings are light press fit on rotor.
Remove end plate (15) and bearing (14) from rotor.
MOTOR ASSEMBLY
Lubricate bearing (14) with ARO 33153 grease.
Assemble bearing (14) to end plate (15). NOTE: Press on out-
er race of bearing.
Assemble end plate (15) to rotor. NOTE: Press on inner race
of bearing.
Coat five rotor blades (16) with ARO 29665 spindle oil and as-
semble to rotor slots - straight side out.
Coat i.d. of cylinder (18) 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 slots in end plate (15).
Assemble bearing (20) to end plate (19). NOTE: Press on out-
er race of bearing.
Assemble end plate (19) to rotor. NOTE: Press on inner race
of bearing. Be sure rotor turns without binding.
Insert locating pin (23) 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 (23).
Grease and assemble “O” ring (21) to end plate (19).
Assemble spacer (22) to motor.
Assemble gearing and right-angle section to tool.
HOUSING DISASSEMBLY
Clamp air inlet adapter (2) in a smooth face vise.
Unthread housing (9) with a strap type wrench.
Remove spacer (3),washer (4), exhaust cap (5),two fillers (6),
spring (7) and valve rod assembly (8). CAUTION: Do not re-
move or adjust rubber portion of valve rod (8), as it is preset at
the factory.
Remove screen (1) from inlet adapter (2).
Remove throttle pin (11) and spring (10).
HOUSING ASSEMBLY
Lubricate throttle pin (11) with ARO 29665 spindle oil.
Install spring (10) and throttle pin (11) into housing. NOTE:
Align slot in throttle pin with air inlet holes in housing.
Install valve rodassembly (8)into housing. NOTE: Throttle pin
(11)should not pull out when valve rod (8) is seated properly.
Install two fillers (6) to exhaust cap (5).
Assemble exhaust cap (5) to housing, aligning lever with
throttle pin (11).
Assemble spring (7), washer (4) and spacer (3) to tool, secur-
ing with inlet adapter (2).
Clean and replace screen (1) in inlet adapter (2).

67
48220-( ) LIGHT DUTY
65 49
LEFT HAND THREAD LEFT HAND THREAD
LEFT HAND THREAD
79
80
83
I
86
82
84
79
1
\
79
80
78
81 r(r
82 I
79 -I
I
II-
fy-z
I
I-
I?-
EC
80
88
t
89
81 JB
,85
82 J
-1 -3 -4
-2
66 48212-1 REGULAR DUTY
I
46 I 45
LEFT HAND THREAD
I -
LEFT HAND THREAD
69
70
71
72
69
70
71
72
NOT SHOWN
n 48182-1 PIN WRENCH
* ITEMS INCLUDED IN SERVICE KIT NO. 48447-1.
= INCLUDED IN 48220-( ) RIGHT ANGLE ASSEMBLY (ITEM 67).

M22
75
27 26 25 24 31 87
\
m
1:l RED.
27 26 25 24 39 33 40
USEREGULAR
1
DUTYR/AASSEMBLY\ (3 6.67:1 RED.

FORMODELS
NOTCH THIS END
DR053B-( )
29* 28* 27 26 25 24
* ITEMS INCLUDED IN SERVICE KIT NO. 48447-1.
29* 28* 27
4.40:1 RED.
0 SHO y I
:8:76-I &NING LABEL (NON-EU MODELS)
49883 WARNING LABEL (-EU MODELS)
29* 28* 27 26 25 24

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
62
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
PART NUMBER FOR ORDERING
.
Screen. ...........................
Inlet Adapter ........................
Spacer .............................
Diffuser Washer .....................
Exhaust Cap ........................
Filler (2 req’d) .......................
Spring ..............................
Valve Rod Assembly .................
Head Assembly ......................
Spring ..............................
Throttle Pin .........................
Lever ..............................
Roll Pin .............................
Ball Bearing .........................
Rear End Plate ......................
Blade (5 req’d) ......................
Rotor ...............................
Cylinder ............................
Front End Plate ......................
Ball Bearing .........................
MOTORASSEMBLY(includesitems14thru20).
“O”Ring.. ..........................
Spacer .............................
Locating Pin ..........................
Ring Gear (single reduction) ...........
Pin (2 req’d) .........................
Spacer .............................
Ball Bearing .........................
Washer.. ...........................
Snap Ring ..........................
Ring Gear (double reduction) ..........
Spindle Assembly 1:1 ratio ............
Spindle Assembly 3.43:l ratio .........
Needle Bearing (3 or 6 req’d) ..........
PlanetGear(3or6 req’d)3.43:1ratio(15teeth) .
SunGear(1or2 req’d)3.43:1ratio(21teeth) .. .
Spindle Assembly 4.4O:1 ratio .........
PlanetGear(3or6req’d)4.4O:1ratio(18teeth)
SunGear(1or2 req’d)4.4O:1ratio(15teeth)
...
Spindle Assembly 6.67:1 ratio .........
PlanetGear(3req’d)6.67:1ratio(21teeth) ....
Carrier Assembly 3.43:1 ratio ..........
Spindle Assembly 3.43:1 ratio .........
Spindle Assembly 4.4O:1 ratio .........
Spindle Assembly 6.67:1 ratio .........
Coupling ............................
Snap Ring ..........................
Lock Nut ............................
Bearing Lock Nut ....................
Grease Fitting .......................
33911
46377
47139
46449
46448
46452
41654
46354
46723
46374
46296-2
46326
Yl78-28
47724
46312-1
46413
See char
48201-1
47722
Y65-13
See char
Y325-214
46412
47723-2
46468-1
Yl24-61
46496
Y65-13
47694
Yl42-2
46467-1
48366-1
48222-1
42315
46899
46465
48223-1
46900
46466
48224-1
46901
46521
47752
47753
47750
46741
Y11O-11
46745
37105
35967
50
51
52
53
54
55
56
57
58
59
60
61
63
64
65
66
68
69
70
71
72
73
74
75
76
77
76
80
81
82
83
84
85
86
87
88
89
90
91
92
93
M22
PART NUMBER FOR ORDERING
Ball Bearing .........................
Snap Ring ..........................
Spacer .............................
Needle Bearing ......................
Bevel Pinion ........................
Right-Angle Housing .................
Needle Bearing ......................
Sleeve (not shown) ..................
Coupling ............................
Ball Bearing .........................
Right-Angle Body ....................
Right-Angle Shim (.005" thick)(2 req’d) .
Right-Angle Shim (.003" thick) .........
Needle Bearing ......................
Bevel Pinion ........................
Right-Angle Housing .................
Right-Angle Assembly ...............
Right-Angle Assembly ...............
Spindle .............................
Sleeve .............................
Bevel Gear .........................
Washer.. ...........................
Ball Bearing .........................
Spindle (1/4" - 28 female thread) ......
............................Chuck
0-1/4" ............................
1/16” - 3/8” .........................
Spindle Assembly ....................
Spindle Assembly ....................
Gear (1/4” - 28 female thread) .........
Ball Bearing .........................
Shaft ...............................
Ball (22 req’d) .......................
Lock Nut ............................
Gear (9/32" - 40 female thread) ........
Collet Insert .........................
Spindle Assembly ....................
Spindle Assembly ....................
Drive Plate ..........................
Gear (#10 - 32 female thread) .........
Spindle Assembly ....................
Gear (5/16" - 24 female thread) ........
Spindle Assembly ....................
Carrier Assembly 4.4:1 ratio ...........
Carrier Assembly 6.67:1 ratio ..........
SERVICE KIT: includes items 1, 6, 7, 10,
13, 16, 21, 28,29, 51, 52, 53, 61, 62, 63
and 81 .............................
32850
Y110-5
46742
48202-1
46733
48205-1
46750
48194-1
48184-1
Y65-8
48198-1
48197-1
48197-2
46222
48178-1
48206-1
48212-1
48220-( )
48189-1
47600
46735
47694
Y65-13
48190-1
48187-1
31330
47341
48213-1
48214-1
48179-1
41643
48183-1
32594
48188-1
48180-1
43497-169
48207-1
48208-1
46716
48516-1
48515-1
48683-1
48684-1
46522
46721
48447-1
9

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t\~~TAiiip
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0
v
._.‘.” w.
. .I

M22
75
11

Part of worldwide Ingersoll-Rand
PN 49999-109