The kit comes with a parts diagram but NO instructions! They list all the parts online, so you can get the names from the site. The diagram has the parts in the kit in bold, so at least you know which to replace.
The striker was frozen in the hammer pipe, and freeing it took a lot of prying and tapping. That may have been al
... Read morel that was wrong, but I purchased the kit, so I used it all. Removing the striker was the trickiest part: there is a split ring at the base the striker that can just barely be seen through the holes in the pipe. You have to pry that down and off just working through the holes, and that was crazy hard. A lot of it may have been that I wasn\'t even sure it came off. The rest is just very carefully minding the parts. It can help to use a small clamp to hold the two stopping device parts in place while juggling the whole thing back in place. A lot of grief, but the tool works like new now.
1. Remove bottom plastic cover with allen wrench
2. Remove power cord(optional)
3. Remove nose piece assembly
4. Remove secondary handle
5. Remove top lid via. 6 T25 torx screws. Note: Machine thread
6. Drain oil
7. Place in vice holding on to neck right where secondary handle mounts
8. Looking in
... Read moreto nose area with snap ring pliers remove retaining ring, large keyed washer, and
large metal collar
9. Now standing in front of and looking down at the spot that you removed the lid rotate
piston so where it connects to the gear is either farthest or closest to you and use a flat
screw driver to gentle wedge the arm off the dowel that connects it to the gear and
pull out entire piston assembly
10. Now this next step your going to have to PAY ATTENTION, slide the barrel out thru the
Nose and place to the side. Back where the piston \"was\" at the very front of that pocket
there is a assemble that includes a gear sleeve, usually two shims, an outer sleeve,
and an inner sleeve. Don\'t scratch, bend, tweak, or mar these shims in anyway.
11. Now for the last piece, inside the nose body after everything is removed, look and you
will see an O-ring right in the middle, its no wider than 1/16th or 5/64ths of an inch.
Remove it.
12. Now inside the barrel there is a retaining ring, use a very small flat head screwdriver
from the outside thru one of those little holes and pry up just enough so as to pop it
out of the groove it is in. Now from the inside of the barrel use one of your looong looks, the one that looks like it was from captain hooks missing hand, and stick it down the
inside of the barrel and hook that ring, now gently wiggle that ring so it is perpendicular
to original position and yank with one hard pull and it should come right out of the barrel
Tap the upright barrel lightly on your work bench and the three other pieces should come falling out.
13. Now remove roto from vice and clean in side mechanical compartment with break cleaner. If you use a water based cleaner make sure to dry it out completely, like take an air
compressor to it when you think you got it all out. Also clean each part that you removed
as well
14. Now do these steps backwards up until step two.
15. Remove brushes one at a time. Note one brush has two wires, this is why I say one at a
time.
16 . Now just finish the assembly and don\'t forget to add your oil res. before running.
Bosch Model 11241evs - This is a very well designed tool. Not a big Bosch fan but this tool is worth fixing.
Lots of good advice here already. Take good pictures along the way, you won\'t regret it. It\'s easy enough that I was glad I didn\'t pay the Bosch factory $340 + Shipping.
The little internal snap ring that hold
... Read mores one of the strikers inside the tube - likely the part that\'s bad to remove. As one user explained, you have to work it through the holes in the side of the tube. It\'s a puzzle and you\'ll need a little patience. Everything else is straight forward - seals, etc. It\'s a little like working on an automatic transmission.
Opened unit put prong on piston added oil added other o rings and gaskets
Put unit back together and it still wonGÇÖt work so I scraped it and bought a new one
Would cost more than itGÇÖs worth
Already spent money on the repair kit
I have a Bosch model 11241evs Rotary Hammer. Gun only has 20- 25 hrs on it. was able to get into the hammer end of it with out taking motor apart. Brushes looked like new anyway. The striker [no 57] was stuck in the barrel, out of reach of the piston. And the breakdown from eReplacement does not show the striker pin [ no841] in their
... Read morebreakdown. Went to toolparts Pro for a correct detail of the gun. It was a time consuming tear down. ,Getting the snap ring out from the inside of the barrel was a challenge with that striker stuck in there. You need a lot of patience.
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Hammer action not working
Donald from Granite Bay, California
2 of 2 peoplefound this instruction helpful.
Difficulty Level:
Difficult
Total Repair Time:
1- 2 hours
Tools:
Pliers, Screw drivers, Wrench (Adjustable), Wrench set
Remove nose guard, large C-clip, remove misc pieces on nose of tool. paying particular attention to order and placement of remove parts. Open oil reservoir, remove oil, unhook hydraulic piston and remove driver barrel from front of tool. Take note of position of clutches, shims for re-assembly. Clean hammer barrel with brake fluid. Ta
... Read moreke barrel on wood work bench trying to remove driver pin from rear of barrel. Behind the first driver pin is a small c-clip deep inside the barrel holding in the front driver pin. Remove this c-clip using screw driver and curved set removal tool. Clean all parts, replace o-rings and parts as noted in re-build kit. Re-assemble in reverse order.
Disassembled all gears, piston, and everything in the nose or the machine. The plastic collar was broken and the eroded plastic material was mixed with the oil as a fine powder. Oil smelled very strange. Removed all parts, cleaned everything with solved (gasoline), put in fresh oil and a service pack as long as I had it apart. Re-assemble
... Read mored machine and it worked fine. Trickiest part was removing snap rings, which due to their location required precisely the exact correct snap ring pliers. \"Universal\" ones with interchangeable tips will not work. On top of that there is a snap ring in an internal bore that needs to be removed by reaching through holes in the side of the nose piece with something like a pick to get it out of its groove. This is necessary to remove the striker/hammer assembly, in order to clean all the residue of dirty oil off of them. This is not obvious from any illustrations.
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Model Cross Reference
This part works with the following models:
ERP Number: ERP19504598
Manufacturer Part Number: 1617000430
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