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2. Installing a socket align the plunger located in the square part of the shaft/anvil with the hole in the square socket. Check 

that the plunger is fully engaged in the hole. When removing the socket, reverse the sequence.
3. Removing the socket. Please do the opposite point on the method of installing socket.
4. Confirm that the battery is mounted correctly.
5. Check the rotational direction the socket or bit rotates clockwise (viewed from the rear side) by pushing the R-side of the 

push button. The L-side of the push button is pushed to turn the bit counterclockwise. (The L and R marks are engraved on 

the body.) 

WARNING! 

The push button can not be switched while the impact wrench is turning. To switch the push button, 

stop the impact wrench, then set the push button..

button

6. Switch operation. When the trigger switch is depressed, the tool rotates. When the trigger is released, the tool stops. The rotational speed can be controlled by varying the 

amount that the trigger switch is pulled. Speed is low when the trigger switch is pulled slightly and increases as the trigger switch is pulled more. 

WARNING! 

A buzzing noise 

is produced when the motor is about to rotate; this is only a noise, not a machine failure.
7. Tightening and loosening screws. Install the socket or bit that matches the screw, line up the bit in the grooves of the head of the screw, then tighten it.
Push the impact wrench just enough to keep the bit fitting the head of the screw. 

WARNING! 

Applying the impact wrench for too long tightens the screw too much and can 

break it. Tightening a screw with the impact wrench at an angle to that screw can damage the head of the screw and the proper force will not be transmitted to the screw. 

Tighten with this impact wrench lined up straight with the screw.
8. Tightening and loosening bolts. A square socket matching the bolt or nut must first be selected. Then mount the socket on the anvil, and grip the nut to be tightened with 

the hex socket. Holding the wrench in line with the bolt, press the power switch to impact the nut for several seconds. If the nut is only loosely fitted to the bolt, the bolt 

may turn wit the nut, therefore mistaking proper tightening. In this case, stop impact on the nut and hold the bolt head with a wrench before restarting impact, or manually 

tighten the bolt and nut to prevent them slipping.

Maintenance and inspection 

1. Checking the condition of the socket or bit: The bits should be checked regularly. If worn or broken bits can slip or decrease the efficiency of the motor and burn it out.
Replace worn bits with new ones. 

WARNING! 

Pull out battery before doing any inspection or maintenance.

2. Checking the condition of the socket A worn or deformed a square-holed socket will not give an adequate tightness to the fitting between the nut or anvil, consequently 

resulting in loss of tightening torque. Pay attention to wear of a socket holes periodically, and replace with a new one if needed. 

WARNING! 

If you use a driver bit of which point 

is worn or broken, it will be dangerous since it slips. So replace it with a new one. 
3. Check the Screws. Loose screws are dangerous. Regularly inspect them and make sure they are tight. 

WARNING! 

Using this power tool with loosened screws or nut is extre-

mely dangerous.

Use 

Check the work area to make sure that it is clear of debris and clutter. Clear the area of unnecessary personnel. Ensure that 

lighting and ventilation is adequate. 

1. Install the socket or bit. 

WARNING! 

Make sure it is not coming off, if the socket or bit is lightly pulled.  Push forward the bit 

chuck on one side. If the guide sleeve does not return to its original position, then the bit is not installed properly.

push

trigger

Summary of Contents for 1392

Page 1: ...n from one terminal to another Shorting the battery terminals together may cause sparks burns or a fire 15 Maintain tools with care Keep cutting tools sharp and clean Pro perly maintained tools with sharp cutting edges are less likely to bind and are easier to control 16 Check for misalignment or binding of moving parts breakage of parts and any other condition that may affect the tools operation ...

Page 2: ...nto place Always slide it all the way until it locks in place with a little click If not it may accidentally fall out of the tool causing injury to you or someone around you How to remove the battery Withdraw battery from the tool handle while pressing the latch on the top of the battery Charging method 1 Insert the plug of battery charger into the receptacle When the plug of battery charger has b...

Page 3: ...o the battery charger as shown below Make sure it contacts the bottom of the battery charger WARNING If the batteries are inserted in the reverse direction not only recharging will become impossible but it may also cause problems in the charger such as a deformed recharging terminal 3 Charging When the battery is connected to the battery charger charging will commence and the pilot lamp will light...

Page 4: ...ned up straight with the screw 8 Tightening and loosening bolts A square socket matching the bolt or nut must first be selected Then mount the socket on the anvil and grip the nut to be tightened with the hex socket Holding the wrench in line with the bolt press the power switch to impact the nut for several seconds If the nut is only loosely fitted to the bolt the bolt may turn wit the nut theref...

Page 5: ... battery must explode if it is incinerated The product that you have purchased contains a rechargeable battery The battery is recyclable At the end of its useful life under various state and local laws it may be illegal to dispose of this battery into the municipal waste stream Check with your local solid waste officials for details in your area for recycling options or proper disposal 9 Storage S...

Page 6: ...ation of reasonable evidence completed guarantee card purchase receipt or delivery note Damage attributable to normal wear and tear overload or improper handeling will be excluded from guarantee In case of complaint please send the tool undismanteled together with proof of purchase to the nearest Unior service station postal charges prepaid Unior d d reserves the right to decline responsibility in...

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