Makita HM1800 64 lb. Breaker Hammer AC/DC - Answered Questions & Fixed issues

As the retainer shaft (part # 322550-8) wears it will begin to drop the bit. Also could be the roll pins that hold the shaft. Remove the two pins and take a look at condition. You could build up the metal with welder and grind to shape. Part is available at www.toolpartsdirect.com at a cost of about $25. Good luck with your repair.

you have a armature problem I would think, look into the brush tube and try and spin the armature and look for discoloration on the commutator bars.

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

Makita A-90582 or (the equivalent)

Hitachi 981840 Hammer Grease

But dont forget to replace all o-rings and seals at the same time some older models have special wear tear parts sets for service also called maintenance spare parts. If the brushes are short then its time for service.

254031-3 pos14 part inlay key can be damaged pos 11 drive rod 315146-2 can broken IF mechanical damage or dried out by leaking gasket / orings. For better repair use after a repair of some parts an maintenance kit 193394-1 If the working hours are on it, but also after an repair on other parts because leaking tools can be dried out and give cured o rings in a very short time by building up overheat temperature inside and will not build up pneumatic power it will not do the job and is not good for physical strain.

The GREASE for this heavy jackhammer Makita 181490-7 Grease (if there are short carbon brushes to find ) replace all orings gaskets (and looking for an maintenance kit for this machine) 188015-8 thats the better way to service.

Connecting rod Part Number: 315419-3 or Woodruff Key 4 Part Number: 254001-2 Makita HM1211B Parts List and Diagram eReplacementParts com Or broken spindle/ worn bearing(s)

burning motor take it in for a check or junk it

Order an maintenance kit for it , when the working hours are on the tool , all given parts in the kit must be replaced its not a good idea to only grease it, the tool should not leaking by the chisel. then there will be a bad break-force and give a long working job..

Makita 181490-7 30grams

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

something broken , or only dry, leaking (o-rings hard or burned inside) or the armature drive is worn .

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

193606-2 its the neccesary service kit for the tool with all the parts but be aware to control the locking sleeve and impact bolt replace it if its not air tight

As long as its last and the endurance of the worker in first place . Its better then use rotating hammers at a long lasting working order , because of the price the choice of a demolition hammer is always a great difference because of the time you can spend , there are much Chinese models look a like this hammer its popular also bosch models you will see . chinese demolition Google zoeken

first ordernumber 931848 lubrication necessary it has its working hours on it. parts to change in priority 1 x 944-927 , 949457Z , 956-960 , 944-936 , 956-965 , 999032 , 956-996 , 944-928 the important thing is that the machine is airtight at the front so as not to burn the O-rings through the air and incoming dirt friction look the orings good and if the lock bolt on the front feel not smooth replace that also and every oil seal you can find its different what should neccesary but that the tool runs with thick and dirt beaten oil . solvent clean the hard metal parts and replace if there are grooves on or cracks Hitachi PH 65A Demo Hammer Parts

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

A old black graphite or yellow grease lubrication of the brand Makita

193242-4 Revisionkit

Hi is it the hm1810.if so when the machine is upright make sure that the holder on the base is at an angle of lets say 4-5 o clock then insert the steel into machine then push the holder downward into the 6 0 clock position this should lock the holder around the ridge on the steel u have inserted.
Good luck