Page No 3
Declaration of Conformity
Sioux Tools Inc.
250 Snap-on Drive, P.O. Box 1596, Murphy, NC 28906, U.S.A.
declare under our sole responsibility that the product
Model IW38HAP-3P/IW38HAP-3F/IW38HAP-4P/IW38HAP-4F/IW38HAP-7Q
Impact Wrenches, Serial Number
to which this declaration relates is in conformity with the following standard(s) or other normative document(s)
EN792 (Draft), EN292 Parts 1 & 2, ISO 8662 Parts 1 & 7, Pneurop PN8NTC1
following the provisions of
89/392/EEC as amended by 91/368/EEC & 93/44/EEC Directives
Mark Pezzoni (President, Power and Specialty Tools)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Name and signature or equivalent marking of authorized person
Printed in Japan
Dismantling & Assembly Instructions
Disconnect tool from air supply.
Remove oil plug (35) and position tool so that the oil in the clutch
housing can be drained into a suitable container. Grip motor
housing (1) in a vise fitted with soft jaws and remove 4 screws (37)
from clutch housing (36) or (53) with O-ring (34) and oil seal (38)
or (54). Oil seal (38) or (54) may be pressed out of clutch housing
(36) or (53) if replacement is needed. Remove anvil spacer (31)
noting that on reassembly, the chamfered side of spacer goes
toward the hammer cage (26). Gripping hammer cage (26), pull
out complete twin hammer mechanism. Pull out anvil (42) or (59)
or (50), noting the orientation of twin hammers (25) for reassem-
bly. Remove thrust button (28) and compression fitting (29). Push
out hammer pins (27) from hammer cage (26) allowing twin
hammers (25) to be released.
For IW38HAP-3P/IW38HAP-3F: Lock collar (43), spring (44) and
lock fitting (45) may be pried off anvil (42) if replacement is needed.
For IW38HAP-4P/IW38HAP-4F: Spring (60), lock fitting (61) and
lock collar (62) may be pried off anvil (59) if replacement is needed.
For IW38HAP-7Q: Stop spring (58), pit washer (57), spring (56),
pit sleeve (55) and steel ball (51) may be pried off anvil (50) if
replacement is needed.
Soak rusted nuts in penetrating oil and break rust seal before
removing with impact wrench. If nut does not start to move in three to
five seconds use a larger size impact wrench. Do not use impact
wrench beyond rated capacity as this will drastically reduce tool life.
NOTE: Actual torque on a fastener is directly related to joint
hardness, tool speed, condition of socket and the time the tool is
allowed to impact.
Use the simplest possible tool-to-socket hook up. Every connection
absorbs energy and reduces power.
Forward/reverse operation is controlled by reverse valve unit (10)
located just above trigger (7). Depress reverse valve (10) until a
distinct click is heard and the valve remains depressed. The tool is
now in reverse mode. Fully depress valve again and the reverse valve
unit (10) will release allowing forward operation. Ensure that the
reverse valve unit is in the proper position before starting tool.
The air regulator controls the speed of the tool and is located on the
lower portion of end cap (22). It is a 3-position, thumb operated
regulator with “3” being the highest setting and “1” the lowest setting.
Using thumb, move the slide downwards to increase speed and up-
wards to decrease speed.
The tool incorporates an air strainer in hose adaptor (6). Check
periodically to see if this is becoming blocked as blockage will
reduce the speed and power of the tool. To clean the air strainer it is
necessary to remove the hose adaptor (6) from motor housing (1).
For best results:
1) Always use the correct size impact type socket.
2) Use extra deep sockets in place of extension bars where
possible.
3) Do not use oversized, worn or cracked sockets.
4) Hold the wrench so the socket fits squarely on the fastener. Hold
the wrench firmly, but not too tightly, pressing forward slightly.
CE
Operation Specification
Air Consumption
Max. Torque Reverse
Max.Torque Forward
Working Torque
Air Inlet Thread
Overall Length:
IW38HAP-3P/3F
IW38HAP-4P/4F
IW38HAP-7Q
3.3 cfm (24 scfm)
250 ft.lbs. (339 Nm)
230 ft.lbs. (312 Nm)
60-200 ft.lbs. (81-271 Nm)
1/4-18NPT
6.6" (168 mm)
6.7" (171 mm)
7.3" (186 mm)
at 90 PSIG/6.2 bar
Remove 4 screws (23, 24) from end cap unit (22) noting the longer
screws (24) will be returned to the bottom two holes during
reassembly. Carefully pry off end cap (22) complete with air
regulator and gasket (21). Do not remove air regulator from end
cap unit (22). Pull out reverse valve unit (10) from motor housing
(1). Remove drive motor assembly and support rod (40) from
motor housing (1). Remove guide pin (19) from rear plate (18)
allowing rear plate (18) to be removed from front plate (14). Ball
bearing (11) may be removed from rear plate (18). Remove 6 rotor
blades (16) from rotor (17). Ball bearing (11), oil seal (12) and
O-ring (13) may be removed from front of cylinder (15). Using a
suitable punch, tap out spring pin (9) and remove throttle trigger
(7). Unscrew hose adaptor (6) and remove exhaust deflector (5),
throttle spring (4), valve stem (3) and muffler (64). Do not
attempt to remove grip from motor housing (1).
Reassembly
Place front gasket (41) on the motor housing assembly and put
O-ring (34) into the grove of the housing. Never place the front
gasket upside down. Insert 4 support rods (40) into the corner slots
of the motor housing assembly provided for the torx screws.
Clean all parts and examine for damage and wear. Particularly
examine O-rings and oil seals for cuts and wear. Also carefully
check for cracks and wear on hammer pins (27), twin hammers
(25), hammer cage (26) and anvil (42) or (59) or (50), particularly
in the area of the square drive. Replace all parts where necessary
with manufacturer supplied parts. Lightly coat all parts with a
suitable pneumatic tool lubricating oil and assemble in the reverse
order. Apply Locktite 271 to thread on hose adaptor (6) before
assembly. On completing assembly, remove oil plug (35) and pour
into the front end 5/8 fl. oz. (15cc) of a standard SAE20 grade oil
and replace oil plug (35). For IW38HAP-7Q: Put steel ball (51) into
anvil (50), put pit spring (56) pit washer (57) and secure with stop
ring (58). Pour in approx. 5 ml of a good quality lubricating oil, one
preferably containing a rust inhibitor, into the hose adaptor (6) with
the trigger (7) depressed. Connect to a suitable air supply and run
the tool for a few seconds to allow the oil to circulate. Check the
function of the trigger (7), reverse valve (10) and regulator and
reset for operation required. Refer to section Operating.
