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Buy a new switch the old switch was modificated by an maintenance kit if you have an old blue or red real Kango from England. or black Atlas Copco .
But if you have the red Milwaukee Kango then there is only a new switch to replace.
The total condition of the seal anvil piston and striker are very important for the total condition of impact when spending a service kit (maintenance) when there is leakage at the front part everything will be hot inside and the rings will harden again quickly.
If these are the original Kango kangos then you are out of luck. They have been obsolete for many years now and no parts have been manufactured for a long time. The name was bought by DeWalt and they didn't do much with it. The Kango name is now ownd and used by Milwaukee, but there machines do differ alot from the originals. There were a few main models and the main mid sized breakers were the 900 (hammer only) and 950 (rotary hammer) There were a few facelift/variations of each (K, X and B I think) and they did use a couple of different sized seals/pistons/cylinders. If it is one of the Milwaukee models you can look up diagrams here... http://www.milwaukeetool.com/
Hammering problems are usually caused by worn o-rings and there are a number of them. If you're not familiar with hammer's insides, you probably want to take it to a service center and have them put a service kit in. Or you can buy it too. And the service kit will come with a diagram. (Or ask them to print one out.)
If you do it yourself, remember, don't use too much grease.
Milwaukee K900K or the English Kango 900K Blue old or Red some younger handle it differs very much English Kango was using a thick brown grease in 2 chrome colored plastic bags . the Milwaukee K900K has a lubrication grease also not oil but be aware of the operating hours i f you have a K900K model from Brand Milwaukee tools replace also a service kit and the bearings on the armature is important also Its neccesary to protect you from damage
if you have a English Kango its hard and expensive to get a spare parts and most times the tools are worn in the front of the chisel stroke bolds do not get right close and the piston pins are worn it was a good tool about 20 years ago i have serviced much of them . but the first thing thats important that its air-tight in front of the chisel and everywhere thats having a mechanic/pneumatic duty
it sounds like it needs service,service is taking lower unit apart cleaning and regrease with special kango grease, if unit was serviced recently or not used much, grease could be real old and dry,sometimes you have to warm up unit before they start hitting correctly,,also if used a lot could be dirt build up,inside bit holder.remove bit holder clean out dirt regrease with heavy bearing grease,just grease the lower part,not very much grease is needed
Milwaukee now owns Kango, unfortunately I believe the 950sv is the old style. Parts are no longer avail. I have about 20 of the breakers. It is really too bad, they were great machines.
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