Question about Makita HM1810 Factory-Reconditioned 70 lb. Breaker Hammer

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Recomanded protective gear

What is the recomanded protective gear?

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Check oil

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Always wear an helmet while working with any kind of demolition or heavy tool. Safety first!

Posted on Aug 27, 2008

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Bosch gbh5 will keep loosing its hammer


It sounds like the gearbox oil is getting low. The GBH5 uses oil in the gearbox, not a grease - the grease is used for assembly only. The correct type is a PG-150 (fully synthetic gear oil). Unable to find it in small quantities, I now use PAG150 oil for automotive a/c systems, it's available in small bottles. As for quantity, no-one seems to know... I just fill to cover the big bottom gears.

Jan 18, 2014 | Bosch Brute Breaker Hammer 11304

2 Answers

My kango 637 breaker runs but no power is getting to the chisel canyou help please


There are a couple of main things that could cause this. Unfortunately this is an obsolete machine and I doubt you will be able to find any spares for it. Probable causes are worn seals/in need of service. Worn armature pinion gear and/or crank pinion gear. Ideally you should replace both if either one is damaged, even if the other one looks ok. There are always other possibilities but they it would need stripping on the hammer mech to check all the piston/pins/anvils etc. This is a very old machine (I cut my teeth on these when i started in the trade 20yrs ago).

Dec 12, 2011 | Breaker Hammers

1 Answer

Runs but doesnt engage rotary or hamer. the machine itself looks in great condition its called bosch buldog extreme.


there is a selector knob on the side that controls the tool functions for drill only/hammer with drill/ and hammer only. make sure it is in the proper setting. If it still doesn't rotate then you have a gear or a broken selector. If no hammer then you have worn o rings or a stuck ram. try the selector first and if still no change please be more specific if no hammer at all, or no rotation even when selector moved.

Mar 03, 2011 | Bosch SDS-plus BULLDOG Xtreme Rotary...

1 Answer

How do I drain the gear oil from a Bosch Brute Jack Hammer


Brute hammer uses special grease sold as service kit. This kit contains enough grease to lube hammer and replacement bolts that hold springs along the bottom. Check www.toolpartsdirect.com for parts and kit. Remove the lower half (tube) of hammer, also remove three bolts that hold springs and remove assembly from tube. Wash out old grease. Grease will be oil-like only when hammer is very hot, otherwise grease is paste-like. Good luck.

Jun 22, 2010 | Bosch Brute Breaker Hammer 11304

2 Answers

HOW DO YOU DISASSEMBLE THE GEAR BOX SECTION OF A HILTI TE 74 HAMMER DRILL?


Its not that hard. however I have been working with hiltis for 22 years. once you have removed the handl assembly, remove the 4 screws which hold the motor unit to the gearbox. you will lose oil but dont worry. this will expose the drive gears. the smaller one is the crank drive or the hammer action. the larger one is the clutch assembly for the drilling action. remove the smaller of the 2 gears from its shaft by removing the circlip. you should now be able to see the circlip which holds the crankshaft into the gear housing. remove the circlip and pull out th crankshaft, this will be a tight fit so you may have to hold the shaft in a vice and carefully fit the gear housing using a rubber mallet. now you have to remove the chuck. 1st remove the rubber cap by getting a large flat screwdrivver behind it. using circlip pliers, remove the c-clip (wear safety goggles) the rest of the chuck parts should them be able to be removed with easy. you should now be able to see a large circlip, remove it. you can now remove the oil seal. this will need replacing as it is hard to remove without damage. part number 206105. under the seal there is another circlip. once this is removed you will be able the remove the guts of the gear box. again you may have to put the chuck tube in a vice and tap the gearbox housing with a rubber mallet. again you will loose oil. to reassembly just reverse the prosess. remove the oil filler cap to ensure that the crank shaft locates on the con rod . once reassembled replace the oil. 40cc only. transmission oil is good and the closest match you will get to the origional. for more info send me an email.

paul@wysehire.gi
www.wysehire.gi.

ps before you start make sure that parts are still available for this machine asit is quit old (no offence).
The piston rings (17955) are but i dont know about the oil seal.
you car get the seal from any car parts shop. it is a double lipped seal 35mm x 62mm x 10mm.

I hope this has helped. please leave feed back.
email me if you want a diagram sent.

Happy xmas

Nov 03, 2009 | Breaker Hammers

4 Answers

I have a hilti TP800 that will not hammer. no polunging action for the chisels


TP800 are that takes me back. right hear we go...
as over people have sugested remove the 4 screws and the black plastic cap from the top of the machine. you should be able to see the con rod and the crank gear, and in front of the crank gear you should see the small gear which is the top of thr armature, you may have to scoop out some grease in order to see it. Check that the con rod is not broken. earlier machines had aluminium cod rods but the later models have plastic ones which were prone to breaking. this isn't to say that the aluminium ones never broke because they did and wow what a mess may made when they did. if your con rod looks ok, try this... keep your hands clear of the open gears, and put some glasses on. turn the machine on and make sure that the crank is turning. look at the small gear on the armature to see is it is wobbly. the small roller bearing at the top of the armature use to callapse causing them to wobble. this would strip both the gears. a good sign of this is metalic parlicles in the grease. this fault is very expensive as you will have to replace the armature, bearing, seal, and the crankshaft. ouch...BUT DONT DESPARE. if this looks ok, it must be the piston rings these are cheap, fairly easy to change and available, as they are still used on more current models. the part number for these piston rings (o-rings) is 13772. want to know how to change them?.. read on...The hardest part is removing the chuck as you must remove the retaining clip at the tip of the chuck. hilti make a special tool for this, but it is possible with a good set of circlip pliers, 2 flat screw drivers and 4 hands. top tip...Remove the rear handle assembly, just remove the 4 screws and pull it off, now the machine can be stood upright on a workbench. Wear safaty goggles and put a chisel in the chuck, this will help you not to loose the clip when it flies across the workshop, I hate it when that happens. once you have the clip off its easy from now on. and don't worry, there is an easy way to get it back on. ok, the clip is off. remove the washer and the plastic chuck cover. remove the circlip, remove the chuck sleeves, dont loose the 6 balls or the roller. now there is another large circlip which holds on the black plastic cover. remove them both. now you can see the 6 bolts which hold the machine together. remove them. remove the chuck.you will see a large o-ring around the cylinder, remove it. Now with a screw driver carfully split the cylinder at the point where the o-ring was sitting. carefully pull out the inner cylinder. dont loose the small plastic balls. if they fall out dont worry. put them to one side. inside this cylinder you will find the follower piston, just tap the clyinder on the workbench and it will fall out. replace the o-ring, smaer with grease and replace. The drive piston is probably still inside the red casing. Simply pull the con rod off the crank and tip it out of the casing. on early models this piston had 2 seals. 1 teflon ring over a green rubber O-Ring. on later models these were replaced with an o-ring, the same as the follower piston, the earier type may not be available in which case you may have to replace the pison as well in order to fit the newer o-ring system. once the seals have been replaced, smear with grease. place the piton inside the cylinder just far enough so the conector pin cant fall out of the drive piston. Replace the plastic balls into the detents in the cylinder. use grease to hold them in place. Replace the cylinder into the caseing but make sure that the cut out at the end of the cylider is facing down. This is where the armature gear sits. as you push the cylinder in ensure that the con rod is hooked onto the crankshaft. reassemble in reverse order. use grease to hold the chuck balls and roller in place. dont fit the rear handle yet..now for that clip that caused all the pain at the start of the job. PuT YOUR GOGGLES ON. stand the machine upright on the workbench and get somone to hold it. place the clip on top of the chuck body tube. get a block of wood and place it on top of the ring, and hit it with a hammer. this will knock the ring on 80% of the way, now tap it on with the hammer. refit the rear handle. your done,,,if you removed all the grease replace with a similar type. 70 grams (3 oz) in the crank case under that black plastic cover..
Well I hope that helps, its not as bad as it sounds.
good luck.
please leave feedback .
if you have any more questions please email me.
if you want a parts diagram i can email you a drawing of a TE804 which is virtually the same machine with a slightly different chuck.

paul@wysehire.gi
www.wysehire.gi

Oct 08, 2009 | Breaker Hammers

1 Answer

Need to know how to take appart the bosch brute hammer gear case? Spring shaft removal technique?


You can go to Boschtools.com and type in your model number for a breakdown, but repairing this tool is a headache.

Sep 20, 2009 | Bosch Brute Breaker Hammer 11304

1 Answer

Bosch brute 11304 runs but does not hammer at bit end. Any advice?


Sounds like you have a broken connecting rod. The easiest way to check for this is to remove the 4 cap head bolts holding the cylinder on and remove it. If the hammer piston comes off with the clinder you should be able to see the break. If that is ok you may have some stripped gears or a broken spindle somewhere. But I really think it is the connecting rod.

Jul 28, 2009 | Bosch 11304K Brute Breaker Hammer

1 Answer

Bosch Breaker Hammer Service Kit Install


The grease in the upper drive area used to be a purple looking grease and the grease in the barrel was a different color and weight. If you ordered the rebuild kit with the O rings and bolts I would use it in the barrel (light film coat on the parts )

May 10, 2009 | Bosch Brute Breaker Hammer 11304

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