u need to use the special kango grease in the piston and sleeve otherwise they wont hammer ; hilti use oil not greasethis may help
check the piston seals
the grease may have solidified or oil may have leaked
its probably the seals on the piston have hardened and now dont throw the weight back and forth to create the hammer
i have a kango 900 and a 950 sat unusable for that very reason ill get around to fixing them eventualy
ok ok its 17 years since i stopped working in the tool hire shop cant remember everythingu need to use the special kango grease in the piston and sleeve otherwise they wont hammer ; hilti use oil not grease
Its a TE92, drills no problem but ho hammer whilst drilling or whilst hammering