Makita demolition hammer hm1214c remove bit - Makita HM0860C 11lb Demolition Hammer SDS Max

https://www.manualslib.com/manual/585142/Makita-Hm1214c.html?page=5#manual

You require Hammer Grease, All good tool shops should have grease to suit. see link below:-

Hammer Grease 90582 for Makita Power Tool eReplacement Parts

http://www.homedepot.com/p/Makita-Hammer-Bit-Grease-194683-7/205182387

For outside chisels

Inside its depend on the model but most time its a Makita 181490-7 or for the older types Hammer grease Makita P-08361

MAKITA HAMMER DRILL GREASE 30G (181490-7) or for the older HM models Hammer grease Makita P-08361

If the bit turns freely it's possible you have the change ring in the forward position. The HM0860C is a demolition hammer, not a rotary hammer so the bit should not be rotating under power for any reason. On the HM0860C the changing ring on the nose does slide forward to let you choose and lock the chisel bits in 12 different angles. Check to make sure the change ring is in the locked position.

Makita hammer grease http://www.ereplacementparts.com/hammer-grease-p-57574.html

If this was a new unit, it comes with the proper amount already in the gearcase. You might need some for the hammer bits (a small amount of lithium grease) but other than that until the tool needs repaired you should not have to add any.

Makita HM1500B Demolition Hammer Parts Makita HM1500 Instruction Manual Page 8

Makita HM1500 Instruction Manual Page 8

Spline or 3/4" Hex - 21/32" Round

more details click here