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With hammer drills, there are usually 3 positions for operation.
Position 1 - Drill only - drill rotates
Position 2 - Hammer and Drill - Drill rotates and hammers
Position 3 - Hammer only - hammer action
It is important to read the instructions to activate the part to select position 1, 2 or 3.
Sometimes, it is easy to move from position 1 to position 2. Sometimes it is easy to move from position 2 to position 3.
Sometimes it is difficult to move from position 2 to position 3.
When it is difficult to move from position 2 to position 3, you may need to rotate the chuck a little way before turning it to position 3.
check the position of the operation lever
it should have 3 positions drill, hammer drill and hammer
make sure it is fully selected or the hammer action will not engage
The "sleeve" below the chuck slides and twists. If it is in the forward position it's in drill mode, because the chuck can't hammer, pull it back and it will be in hammer mode. (the picture shows the black plastic sleeve in the forward position, which can be pulled back over the metal that is still exposed)
The SDS designation relates more to the type of chuck on the tool for the bits than to the tool/drill itself. There are both chisels and drill bits with SDS-Plus and SDS-Max shanks, SDS-Max being the the larger of the two. As far as the tools go: Demolition hammers will only hammer and can only use pointed chisels, scaling chisels, scrapers, etc, not anything like a drill bit that requires spinning to work. Rotary hammers can hammer and rotate the bits. Rotary hammers have a selector switch with two or three positions; one for hammer only for the above demolition bits, one for rotary hammer for use with carbite tipped drill bits, and some have a position for rotation only. The rotary hammer is a more versitile tool but more expensive because of extra workings inside.
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