Impact Intensity Adjustment; Adjustment - Stanley IW12 Service Manual

7. Lubricate and install the O-ring on the main shaft. Install
the back-up ring, back-up washer and retaining ring.
8. Grease the thrust bearing and thrust washers and install
on the main shaft. Install the hammer case gasket (or O-
ring) and replace the mechanism. See parts illustration for
thrust bearing part sequence.
9. Install the four 3/8-16 x 1-3/4-inch/44 mm long socket
head capscrews and lockwashers. Tighten to a torque of
13-15 ft lb/17.6-20.3 Nm.
10. Lubricate and install the O-ring and back-up ring (O-ring
toward the center, then the back-up ring toward end) on the
retaining ring end of the reversing spool.
11. Slide the reversing spool into the main housing from the
right side (as the wrench is held during operation). Install
only far enough to install the O-ring and back-up ring on
the lever side of the reversing spool with the back-up ring
toward the end.
12. Center the reversing spool and install the retaining ring.
13. Turn the reversing spool so the hole will be pointing
up. Align the hole in the lever with the hole in the revers-
ing spool and install the lever. Secure with the 1/4-20 x
1/4-inch/6 mm long internal hex set screw. Tighten the set
screw securely.

IMPACT INTENSITY ADJUSTMENT

When shipped from Stanley, the wrench has been set to
produce approximately 800-1000 ft lb/1085-1356 Nm of
torque. The adjustment is made using an 8 gpm/30 lpm
input fl ow to tighten a lubricated 2-3/4-inch thread Skidmore
standard bolt tension tester.
At hydraulic fl ows over 8 gpm/30 lpm, power may exceed
the mechanical capacity and cause mechanism discharge.
Adjust for lower power for fl ows below 8 gpm/30 lpm. In-
crease the adjustment for more power.
For other circuit fl ows, bolt types and torque requirements,
the impact intensity can be adjusted by loosening the jam
nut on the relief adjustment screw (on back of the motor
cap, just above the handle) and turning the relief adjust-
ment screw clockwise for more torque or counterclockwise
for less torque.
SERVICE
The IW12 is not a torque wrench. If the torque setting of a
particular fastener type is critical, the wrench should be set
as close to the desired torque as possible and a calibrated
torque wrench used to verify or check the fastener torque
periodically.
Do not operate the wrench with relief adjustment
screw turned in more than one turn from the bottom
or less than three turns from the top of its travel.
Never operate the wrench without securing the relief
screw jam nut.
1. Determine the characteristics of the circuit that will be
used to power the wrench. The hydraulic circuit and wrench
should be at operating temperature. DO NOT exceed the
maximum fl ow or pressure for the wrench.
2. Attach a fl ow and pressure tester to the pressure port of
the impact wrench. Connect hoses normally and activate
the hydraulic power supply.
3. If the power source is of unknown output, it is good prac-
tice to turn the relief adjustment screw counterclockwise
NO MORE THAN THREE TURNS FROM THE TOP OF ITS
TRAVEL to ensure that the operating pressure remains be-
low 1500 psi/104 bar. Tighten the jam nut securely before
operating the wrench.
4. Install the appropriate sockets/adapters to the impact
wrench and tighten the bolt or fastener you wish to set the
wrench for. Watch the fl ow and pressure tester to be certain
that maximum fl ow and pressure are not being exceeded.
5. Check the fastener with a torque wrench to determine
the actual torque being delivered by the impact wrench.
6. To increase the torque, turn the relief adjustment screw
clockwise NO MORE THAN ONE TURN FROM THE BOT-
TOM. To reduce torque, turn the relief adjustment screw
counterclockwise NO MORE THAN THREE TURNS FROM
THE TOP OF ITS TRAVEL. Check the torque with a torque
wrench.
7. When adjustment is complete, securely tighten the jam
nut.
18

ADJUSTMENT

IMPORTANT