20 Most Recent Hitachi H45MR 12lb. SDS Max Chipping Hammer Questions & Answers


they usually heat shrunk on, to remove it you will probbley damage it.

Hitachi H45MR... | Answered on Feb 01, 2018


A vise is a must (do a safety goggles) hard steel on hard steel can deliver hot splinters at this job, put it the chisel with the machine fixed cross in a vice place the chisel lock on the machine open and slam a fist hammer slowly machine of the tool down.

Hitachi H45MR... | Answered on Dec 18, 2015


Your hammer uses an air cushion created by drive piston to move a driven piston which contacts a second piston or striker. The second piston or striker is the part that contacts the bit. The striker can become restricted from moving to its full limits by debris or just worn slightly shorter (the part of the bit that enters the gun can wear shorter also ). Lack of movement due to debris or shorter length due to wear will cause weak hammering action. Assuming the bits are not worn where they enter the gun, as you push the bit all the way in into the chuck, the bit moves/pushes the striker into position close to the driven piston. The driven piston receives its power/movement from good vacuum between the driver piston. Good vacuum is created when there is good contact with orings to cylinder and good clean lubrication (Use Hitachi gear/hammer grease). As the grease heats up, it will run out of the cylinder. Good clean grease will remain in cylinder even after heavy use. Dirty grease and loose orings will loose power/vacuum to driven piston. You stated that you have different hammering action depending on position indicating that pistons are loose in their cylinder. The hammer should be stored with the nose pointing downward after use so that the driven piston will stay at the end of the cylinder and not slide against the driver piston (when the grease is hot, the driven piston can slide against the driver piston and will take longer to begin hammering).

Hitachi H45MR... | Answered on Sep 21, 2011


Insert sds bit into chuck with slots/slot matching slot in chuck while pulling back on the spring loaded nose. If the bit does not catch try turning/rotating bit to lock. When you release the nose, a pin will drop into the indention on bit and prevent it from falling out during use. Sometimes this pin will break or wear-out thus the bit will not catch. Before you insert the bit, look into chuck for retaining pin. Pulling back on the spring loaded chuck releases pressure on the pin and allows insertion of bit. Parts are available at www.toolpartsdirect.com

Hitachi H45MR... | Answered on Oct 13, 2010


typed in model number H45MR and this is a demolition hammer only, This tool doesn't have rotation, they do have other models that can do light demolition and also drilling

Hitachi H45MR... | Answered on Jan 21, 2009


Try just stopping and starting the machine off a while.to see if the hammer appears.

Hitachi... | Answered on May 03, 2014


There is a sight glass on the side for you to see the oil level. Make sure they are always checked. You can buy the oil at any service center. Hilti makes oil too and can probably be purchased at Home Depots. Also the Home Depots that have tool rental programs would most likely sell the Hitachi oil too.

Hitachi... | Answered on Apr 24, 2012


For most climates a good oil to use is air compressor oil (mineral). Sold at Lowes and many other stores. It has great lubrication properties and can take good amount of heat. In very cold climates where oil could thicken, store hammer indoors to keep warm until ready to use. Good luck

Hitachi... | Answered on Jul 01, 2011

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