Operation - Stanley IW12 User Manual

WRENCH TORQUE INFORMATION
FACTORS THAT AFFECT TORQUE
An impact wrench is a rotary hammer that impacts the
head of a bolt or nut. It does not apply a slow steady
torque like a standard torque wrench. Therefore, several
factors affect the result of torque when using impact
wrenches:
1. LONG BOLTS: Long bolts having high-friction
threads with lubrication under the bolt head or
associated nut can twist when impacted, then
untwist before the next impact. This will especially
happen if there is low friction between the bolt head
or nut and the mating surface.
2. HEAVY, LOOSE OR MULTIPLE ADAPTERS:
Heavy, loose or multiple adapters between the
wrench and socket can dissipate the intensity of the
impact to the bolt head or nut.
3. AMOUNT OF IMPACT: Maximum torque results
can be obtained by allowing continuous impacting
of the socket against the bolt head or nut for at least
10 seconds.
4. HYDRAULIC FLOW RATE: If the flow rate to the
tool is too low, the hammer (or impact) speed is
reduced. If the flow is correct, a change in the relief
pressure does not affect the impact force. Poorly
designed hydraulic circuits can result in lower flow
rates and reduced impact speeds when pressure is
required during impacting.
BOLT GRADE AND THREAD
RECOMMENDATIONS
Allowable bolt torque is limited by both bolt thread
diameter and grade of steel in the bolt. The IW12 Impact
Wrench is recommended for use on the following bolt
grade and thread sizes:
SAE Grade 2
SAE Grade 5
SAE Grade 8
PREPARATION PROCEDURES
CHECK POWER SOURCE
1. Using a calibrated flow meter and pressure gauge,
check that the hydraulic power source develops a
flow of 4–12 GPM/15-45 LPM at 1000–2000 psi/70-
140 bar.
2. Make certain that the hydraulic power source is
equipped with a relief valve set to open at 2100
psi/145 bar minimum.
10 ► IW12 User Manual

OPERATION

1 to 1-1/2 inch / 25/38 mm
3/4 to 1-1/4 inch / 19-32 mm
5/8 to 1 inch / 16-25 mm
CONNECT HOSES
1. Wipe all hose couplers with a clean, lint-free cloth
before making connections.
2. Connect hoses from the hydraulic power source
to the tool fittings or quick disconnects. It is good
practice to connect the return hose first and
disconnect it last to minimize or eliminate trapped
pressure within the wrench.
Always use sockets and accessories designed for
impact type applications. DO NOT USE STANDARD
SOCKETS OR ACCESSORIES. THESE CAN
CRACK OR FRACTURE DURING OPERATION.
3. Observe the flow indicators stamped on the main
body assembly and the hose couplers to ensure that
the flow is in the proper directions. The female
couple on the tools "IN" port is the inlet (pressure)
coupler.
NOTE: If the uncoupled hoses are left in the sun,
pressure increase within the hoses can make them
difficult to connect. Whenever possible, connect the
free ends of hoses together.
WRENCH OPERATION
The IW12 is designed for 3/4-inch square sockets and
accessories. Adapter part number 06790 or equivalent
will permit the use of 5/8-inch quick change drive
attachments.
Normal applications include installation or removal of
fasteners requiring torque in the range of 300–1200 ft
lb/407–1627 Nm and auger bit wood boring. DO NOT
use the wrench as a hammer drill for metal drilling.
During normal operation it is common to see some
grease leakage from around the anvil during hard
use. Refer to the IW12 Service Manual for the correct
lubrication procedures.
1. Observe all Safety Precautions.
2. Move the hydraulic circuit control valve to the "ON"
position to operate the wrench.
3. Select the direction of impact desired using the
rotary reversing valve located on the left side of
the wrench. To select clockwise direction, move the
lever toward the front (drive end) of the wrench. To
select counterclockwise direction, move the lever to
the rear (handle end) of the wrench.
NOTE: To more accurately tighten bolts, lubricate