Stanley IW16 Series - Operation

IW16 User Manual ◄ 11
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 a󰀨ect 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 ow rate to the tool is too low, the hammer (or impact) speed is reduced. If
the ow is correct, a change in the relief pressure does not a󰀨ect the impact force. Poorly designed hydraulic
circuits can result in lower ow 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 IW16 Impact Wrench
is recommended for use on the following bolt grade and thread sizes:
SAE Grade 2 1-1/8 to 1-7/8 inch / 28.5 / 47.6 mm
SAE Grade 5 1 to 1-5/8 inch / 25.4-41.2 mm
SAE Grade 8 7/8 to 1-3/8 inch / 22.2-35 mm
PREPARATION PROCEDURES
CHECK POWER SOURCE
1. Using a calibrated ow meter and pressure gauge, check that the hydraulic power source develops a ow of
7–12 GPM / 20-45 LPM at 1000–2000 psi / 70–140 bar. Proper ow and pressure maintain proper tool speed.
2. Make certain that the hydraulic power source is equipped with a relief valve set to open at 2100 psi/145 bar
minimum.
3. Check that the hydraulic circuit matches the tool for open-center (OC) operation.
4. UNDERWATER MODELS ONLY: Make certain that the wrench impact mechanism is cleaned and greased with
waterproof grease after each day’s use.
INSERT TOOL BIT - FIG. 2
1.
Always use sockets and accessories designed
for impact type applications and that are in good
condition. DO NOT USE STANDARD SOCKETS
& ACCESSORIES OR SOCKETS THAT ARE IN
POOR CONDITION. THESE CAN CRACK OR
FRACTURE DURING OPERATION AND CAN
BECOME A PROJECTILE.
Disconnect the tool from the hydraulic power source.
2. Push socket onto the square anvil.
CONNECT HOSES
1. Wipe all hose couplers with a clean, lint-free cloth before making connections.
OPERATION
Figure 2 - Install Tool Bit