Assembly, Operating instruction – Northern Industrial Tools NORTHERN INDUSTRIAL BLACK NICKEL AIR IMPACT WRENCH User Manual

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Use proper size and type air pressure line and fittings. The recommended air line for this tool

is 3/8" delivering no more than 90 PSI. Recommended air inlet size is 1/4"- 18NPT.

Use air hoses rated for safe operation of the tool. Air hoses rated for a maximum of 150 PSI or

greater must be used with this tool.

Make sure the hose is free of obstructions or snags. Entangled hoses can cause loss of

balance or footing.


Figure 1. Optimal pneumatic set-up.

NOTE: For best performance, it is recommended to incorporate an inline filter, regulator, and oiler
similar to the set-up seen in Figure 1. Everything needed for the perfect set-up can be found at
Northern Tool + Equipment.

1. You will need to attach a standard 1/4" air connector (not included) to the air inlet (29) of the

tool. First wrap the threaded portion of the 1/4" air coupler with pipe thread tape. Then thread
the air coupler into the air inlet (29), and tighten securely.

2. Turn on the air compressor, set the air pressure regulator of the compressor to 90 PSI, and

connect the 3/8" air compressor hose to the air connector on air impact wrench with a quick
connect coupler (not included).


Do not connect pneumatic tool to compressed air in which the pressure

exceeds 90 PSI. Damage to your tool and possible personal injury may result.

NOTE: If you are not using an automatic oiler system, before operation, add a few drops of
pneumatic tool oil to the airline connection. Add a few more drops after each hour of continual use.

3. Check the air line and its connections for air leaks, and repair them before using this tool.
4. Turn off the compressor and disconnect the air source hose in preparation to attach the

sockets into the impact wrench.



Always disconnect from the air source before examining or changing sockets.

1. Select the appropriate size 3/8" drive socket, and attach the socket onto the wrench’s anvil.
2. Turn the air regulator (32) in the direction indicated by the “H” arrow on the regulator to

increase the power. Turn it toward the “L” arrow to decrease the power.