Was using my Bosch brute 70lbs jackhammer and it quit working. It only makes a humming sound when I press trigger.

Using a different cord wouldn't cause that issue to the tool. Your problem is something inside, UNLESS you used a 5 amp cord, in which case you are melting the cord, not damaging the drill. Just get a proper 15 amp cord for it.

The breaker hammer doesn't need a compressor, running on any 115/120V AC/DC, 15-AMP outlet or 2,500-watt portable generator.

https://www.homedepot.ca/product/bosch-brute-breaker-hammer/1001066459

See this page 8 of the manual

https://www.manualslib.com/manual/19423/Bosch-11304.html?page=8&term=cord&selected=4#manual

..

First to look for faultering contacts on electric field and carbon brushes sometimes a suppression capacitor can give some problems a worn commutator on the armature a switch can be overhauled with a direct cable contact to test to know if it is the switch test it out only with 2 persons for safety in that case.

seems as if the jackhammer motor is locked up and frozen might wanna be careful opening it up and freeing that motor up while its unplugged

measure powercable control carbon brushes that autostop in front of the carbonbrush was coming out of the brush if thats not control the electric field to brushholders and switch.

Part 1617000732 its a complete service kit for this tool with al things neccesary here is the tool in your Country
Bosch Parts Service Online Illustrated Part List

BUT ... For proof that the number of this kit is correct because illustration and description is failed in the parts list in the bosch site outside Europe
http://www.powertools-aftersalesservice.com/public/boschprof/service?p_auth=4MFGtKNX&p_p_auth=9O6peGtv&p_p_id=WSRP_bc93764e__6873__4b00__9a29__b331c9759da9&p_p_lifecycle=1&p_p_state=normal&p_p_mode=view&_WSRP_bc93764e__6873__4b00__9a29__b331c9759da9_wsrp-navigationalState=L0JPUy9QVEFTLVBULVNJUy1TaXRlL25sX05MLy0vRVVSL1ZpZXdQcm9kdWN0LURpc3BhdGNoO3BnaWQ9YmI5NWI3MGRjM2E3NzQxY2ExYzA0OGYyM2IzMDFDTFg5eEhUO3NpZD1WMGtBRXBoTVkwRW9TTTlmTklJYzZaZkhRWUt6OEZGWHpVaUR1UnJzbmxLYUU0Nkg1S3M9

1615430015 is the number of 225 ml GREASE (no oil)



Bosch 11304 0611304139 Demolition Hammer Parts

The armature AND electric field must together replaced to get a safe working again, and the defect will not repeat if it be shure have its operating hours on it and give a full service.

Check your brushes. The brushes on the Brute breaker have a spring loaded, non-conductive pin in them. When either brush wears down far enough the pin pops out and prevents damage to the expensive armature. If by chance the brushes are OK you may have to have your armature tested.

Go to www.boschtoolsservice.com

did you check the cord first? after that I would check the brushes and make sure the switch wired correctly. Let me know if you need more assistance.