ARO WGO37A Series User manual

Tool Products
OPERATOR’S MANUAL
INCLUDING:OPERATION,INSTALLATION& MAINTENANCE
3/8” CAPACITY IMPACT WRENCH
SECTION M35
MANUAL 22
Released: 4-1-91
Revised: 7-7-95
Form: 3801-2
Models: WGO37A-( )-( )
A WARNING
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
l Operate this tool at80 p.s.i.g. (6.2 bar) maximum air pressure - be generated in the use of certain hand-held tools may produce
at the air inlet of the tool. Raynaud’s phenomenon, commonly referred to as Whitefinger
l Disconnect air supply from tool before removing&stalling bit disease. The phenomenon produces numbness and burning
or socket or performing maintenance procedures, sensations in the hand and may cause circulation and nerve dam-
l Keep hands, clothing and long hair away from rotating end of age as well as tissue necrosis. Repetitive users of hand-held
tool. tools who experience vibrations should closely monitor duration
*
l Anticipate and be alert for sudden changes in motion during of use and their physical condition.
start up and operation of any power tool.
l Never exceed rated r.p.m. of tool.
l
l Wearsuitable eye and hearing protection while operating tool. The use of other than genuine ARO replacement parts may
l Tool shaft can continue to rotate briefly after throttle is re- result in safety hazards, decreased tool performance and in-
leased. creased maintenance and may invalidate all warranties.
l
l Use only impact type sockets. ARO is not responsible for customer modification of tools for
l Do not lubricate tools with flammable orvolatile liquids such as applications on which ARO was not consulted.
l
kerosene, diesel or jet fuel. Tool maintenance and repair should be performed by autho-
l Do not remove any labels. Replace any damaged label. rized, trained, competent personnel. Consult your nearest
l Use only accessories recommended by ARO. ARO authorized servicenter.
l It is the responsibility ofthe employer to place the information
in this manual into the hands of the operator.
For parts and service information, contact your local ARO distributor, orthe Customer Service Dept. ofthe Ingersoll-Rand DistributionFor parts and service information, contact your local ARO distributor, orthe Customer Service Dept. ofthe Ingersoll-Rand Distribution
Center, White House, TN at PH: [phone], FAX [phone].
ARO Tool ProductsARO Tool Products
Ingersoll-Rand CompanyIngersoll-Rand Company
1725 U.S. No. 1 North l PO. Box 8000 l Southern Pines, NC 28888-80001725 U.S. No. 1 North l PO. Box 8000 l Southern Pines, NC 28388-8000
©1995 THE ARO CORPORATION PRINTED INU.S.A.

FAlLURETOOBSERVETHEFOLLOWINGWARNINGSCOULDRESULTININJURY.
A WARNING
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.
A WARNING
Do not carry the,tool by the hose.
I
A WARNING
Do not overreach when operating
this tool. Keep body stance
balanced and firm.
I
PN 49769 LABEL PN 49883 LABEL
(NON43 MODELS) (-EU MODELS)
This label must appear on the tool at all times. lf lt ls
lost or damaged, a replacement label ls avallable at
no cost.
Wear hearing protection when
I
I
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 use damaged, frayed or
deteriorated air hoses and
fittings.
-
I
I
I
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.
CAUTlON = Hazards or unsafe practices which could result in minor personal injury or product or property
damage.
NOTlCE = Important installation, operation or maintenance information.
2

ROUTINE LUBRICATION REQUIREMENTS
22
Lack oforan 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.
Work approtimately 3 cc of ARO 33153 grease into the impact
mechanism. Coatthe front portion of the anvil with a small amount
of ARO 33153 grease before assembling the hammer case (46).
Inject approximately 1.5 cc of ARO 29665 spindle oil into the tool
inlet before starting the tool.
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. -
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
beassigned 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 ofthe 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 washedin aclean sol-
vent, blown dry with air and inspected for wear levels, abuse and
contamination. Double sealed orshielded bearings should never
be placed in solvent unless a good method of re-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.
An ARO@model C28231-810 air line FlLTER/REGULATOR/LU-
BRICATOR (F.R.L.) is recommended to maintain the above air
When replacement parts are necessary, consult drawing contain-
ing the part for identification.
supply specifications. -. 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
RECOMMENDED LUBRICANTS
greatly increase the life of an air tool. The filter removes rust,
scale, moisture and other debris from the air lines. Low air pres-
After disassembly is complete, all parts, except sealed orshielded sure (less than 90 p.s.i.g.) reduces the speed of the air tool. High
bearings, should be washed with solvent. To relubricate parts, or air pressure (more than 90 p.s.i.g.) raises performance beyond
for routine lubrication, use the following recommended lubricants: the rated capacity ofthe tool and could cause injury. Shown below
is a typical piping arrangement.
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 5 lb. “EP” - NLGI #l Grease
INSPECTION,MAINTENANCEANDINSTALLATION
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.
Besure that the air supply lines and connectors are of proper size
to provide a sufficient quantity of air to the tool.
MAIN LINES 3 TlMES
AIR TOOL INLET SIZE
LUBRICATOR
BRANCH LINE 2
AIR TOOL INLET
COMPRESSOR
DRAlN REGULAR
3

NOT SHOWN
49769 WARNING LABEL (NON-EU MODELS)
49883 WARNING LABEL (-EU MODELS)
39
--
4
OPTIONAL
WG037A-Bl-()
47 46 45* 44
52
WG037A-A5-( )
60 59 WG037A-C5

1
2
3
4
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
36
37
38
39
40
41
42
43
44
Motor Housing .......................
Inlet Bushing ............. . .........
Retaining Ring (2req’d)
...............
Exhaust Deflector ..................
Reverse Valve ........................
“O” Ring (2 req’d) ....................
Ball...... . .. .......................
Reverse Valve Knob
Spring..............................
..................
screw ..............................
Grease Fitting .......................
Trigger .............................
Throttle Valve. .......................
Retaining Pin *
...... ..................
“O”Ring ............................
Valve Bushing .......................
“O”Ring ............................
“O”Ring (2 req’d) ....................
Throttle Valve Assembly (includes items 13thru 19)
Retaining Pin ........................
Nameplate
fornon “EU” models .................
for “EU” models ....................
Inlet Bushing (includes item 23) ........
“O”Ring ............................
Exhaust Deflector ....................
Deflector Gasket .....................
Gasket Silencer .....................
Exhaust Muffle Kit(includes items 22thru 26).
..
Gasket .............................
Retaining Ring .......................
Bearing.............................
Rear End Plate ......................
Rotor Blade (6included) ..............
Rotor ...............................
Cylinder ............................
Front End Plate ......................
Bearing .............................
Cylinder Dowel ......................
Washer .............................
Hammer Frame Assembly (includes item 40)
....
Hammer.. ..........................
HammerPin (2 req’d) .................
3/8”Square Drive Anvil (optional) (includes
items 42 and 43) ....................
Retainer Support Ring ................
Retaining Ring .......................
Hammer Case Bushing
standard size .......................
.005” oversize .......................
48951-26
48951-181
48951-105
48951-20)
48951-21
48951-179
48951-189
48951-51
48951-22
48951-203
48951-l
48951-156
48951-48
48951-176
48951-191
48951-50
48951-142
48951-47
48951-53
48951-195
48952
49971
48951-54
48951-44
48951-46
48951-45
48951-163
48951-55
48951-52
48951-186
48951-123
48951-40
48951-126
48951-127
48951-124
48951-39
48951-193
48951-180
48951-5
48951-10
48951-6
48951-4
48951-9
48951-3
48951-2
48951-129
48951-130
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
PART NUMBER FOR ORDERING
Gasket .............................
Hammer Case Assembly (includes item 44).
....
Cap Screw (3 req’d) ..................
Square Drive Anvil (includes items 49and 50)
...
Retainer Pin .........................
Spring ..............................
Quick Change Anvil(1/4” hex) .........
Snap Ring ..........................
Thrust Ring .........................
Spring ..............................
Retaining Ball .......................
Retaining Sleeve .....................
Snap Ring ..........................
Quick Change Anvil Assembly (includes
items 51 thru 57) ....................
Quick Change Anvil (7/16” hex) ........
Lock Pin ............................
Anvil Body ..........................
Retaining Ball .......................
Retaining Sleeve. ....................
Spring ..............................
Thrust Ring .........................
Snap Ring ..........................
Quick Change Anvil Assembly (includes
items 58thru 65) ....................
(continued on page 6)
48951-125
48951-11
48951-126
48951-14
48951-150
48951-132
48951-7
48951-118
48951-182
48951-119
48951-115
48951-117
48951-168
48951-12
48951-8
48951-185
48951-186
48951-116
48951-184
48951-145
48951-146
48951-147
48951-13
5

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 “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.
DISASSEMBLY
Clamp the tool in a smooth face vise, with the drive end of the
anvil in an upright position.
Remove cap screws (47) releasing hammer case (48) and
gasket (45).
Grasp the hammer frame (38) and lift the impact mechanism
fromthe housing and set it on the workbench, drive end of an-
vil upward.
Grasp the anvil and lift it from the hammer frame.
Remove two hammer pins (40), releasing hammer (39).
Grasp the splined end of rotor (32) and pull motor assembly
from housing.
Remove washer (37).
Grasp cylinder in one hand and tap drive end of rotor with a
soft face hammer; motor will come apart.
Remove retaining ring (28) releasing end plate (30)and bear-
ing (29).
Remove gasket (27) from housing.
Removescrew (II), releasing knob (10). NOTE: Screw (11)is
assembled with thread adhesive.
Remove reverse valve (8) from housing. -‘.
Using a pin punch, tap retaining pin (20) out the right side of
housing, releasing throttle valve assembly.
Remove trigger (13) from throttle valve (14).
Remove “O” rings (18 and 19) from valve bushing (17).
Remove “O” ring (19) from housing.
Tap out retaining pin (15), releasing throttle valve (14) from
bushing (17).
Unscrew and remove inlet bushing (2) retaining rings (3)and
exhaust deflector (4).
Iftool is equipped with a built-in muffler, remove inlet bushing
(22) releasing exhaust deflector (24) and deflector gasket
(25). Remove exhaust silencer (28).
PART NUMBER FOR ORDERING
PARTS NOT SHOWN
Side Label . . . . . . . . . . . . . . . . . . . . . . . . . .
ACCESSORIES (available at extra cost)
Socket Adapter . . . . . . . . . . . . . . . . . . . . . .
Vertical Hanger . . . . . . . . . . . . . . . . . . . . . .
Horizontal Hanger . . . . . . . . . . . . . . . . . . . .
Lube injector . . . . . . . . . . . . . . . . . . . . . . . .
Quick Change Chuck
for 1/4” hex . . . . . . . . . . . . . . . . . . . . . . . . .
for 7/18” hex , . . . . . . , . . . . . . . . . . . . . . . .
48957-l
48951-114
48951-37
48951-38
636012
48951-120
48951-149
ASSEMBLY
Grease and assemble “O” rings (7) to grooves in reverse
valve bushing in housing.
Coat reverse valve (8) with ARO 29885 spindle oil.
Assemble spring (9) and ball (8) into reverse valve and as-
semble reverse valve into left side of housing.
Assemble knob (10)to reverse valve.
Apply thread adhesive, such as Loctite 242, to the first 2 or 3
threads of screw (11)and assemble to tool, securing reverse
valve. NOTE: Tighten to 8 - 15 in. Ibs.
Assemble “O” ring (18) to groove in throttle valve (14).
Grease and assemble “O” rings (18 and 19) to grooves in
valve bushing (17).
Grease and assemble “O” ring (19) into housing.
Assemble throttle valve (14) into valve bushing (17) aligning
cross hole in throttle valve with hole in bushing.
Assemble retaining pin (15) into hole, securing bushing and
throttle valve.
Press trigger (13) onto throttle valve.
Assemble throttle valve assembly into housing, aligning cross
hole in bushing (17)with hole in housing. Secure with retain-
ing pin (20) inserting pin from right side of housing.
Insert exhaust silencer (28) into housing.
Install retaining ring (3) exhaust deflector (4)and other retain-
ing ring (3) securing with inlet bushing (2).
For tools with built-in muffler, assemble gasket (25) and ex-
haust deflector (24) securing with inlet bushing (22). NOTE:
Tighten inlet bushings to 20 - 25ft Ibs.
Assemble gasket (27) into housing, aligning holes in gasket
with holes in housing.
Lubricate bearing (29)with ARO 33153 grease and assemble
to rear end plate (30) pressing on outer race of bearing.
Assemble rear end plate (30)to rotor,pressing on inner raceof
bearing.
Assemble retaining ring (28) to rotor.
Coat rotor blades (31) with ARO 29885 spindle oil and as-
semble to rotor slots.
Coat i.d. of cylinder (33) with ARO 29685 spindle oil and as-
semble over rotor.
Lubricate bearing (35)with ARO 33153 grease and assemble
to end plate (34) pressing on outer race of bearing.
Assemble end plate (34) to rotor, pressing on inner race of
bearing.
Insert a guide rod (1/8” diameter x 8” long) thru aligned dowel
holes in end plates and cylinder.
Using the rod as a guide, install rod into dowel hole in housing
and slide motor assembly into housing.
Remove guide rod and replace with cylinder dowel (38).
Assemble washer (37) to rotor.
Coat the spline and pin holes of hammer frame (38)with ARO
33153 grease and assemble to rotor.
Coat hammer (39)with ARO 33153 grease and assemble into
hammer frame.
Coat hammer pins (40)with ARO 33153 grease and insert into
holes in hammer frame, engaging notches in hammer.
Cast the anvil with ARO 33153 grease and slide into hammer
frame until it seats.
Coat bushing (44) with ARO 33153 grease and press into
hammer case (48).
Assemble gasket (45) to motor housing.
Assemble hammer (48)to housing, securing with cap screws
(47). NOTE: Tighten screws to 45 in. Ibs.
6

M35
22
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7

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