Oil Reservoir 1615437511

1. Removed the screw on the top cover
2. Added the oil in the bottle
3. Installed new o-ring and replaced screws in cover.

** Originally the machine would not hammer. Come to find out I bought the tool used the there was a new tube of grease that had never been used and that was why it would not hammer. Each use of the tool you need to put a little bit of grease on the bit before locking the bit into place. I just happened to spill the oil when I removed the inspection cover.

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 into 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.

Follow diagrams for tear down. Clean everything and install new seals. Reassemble.

Basically followed the instructions provided in the service pack kit

Opened unit put prong on piston added oil added other o rings and gaskets
Put unit back together and it still won’t work so I scraped it and bought a new one
Would cost more than it’s worth
Already spent money on the repair kit

No instructions provided only schematic which was very helpful in reassembling correctly. Had to rely on previous postings and u tube for help in disassembling. Used a magnet to remove the 6 retainer pins on shaft. Also to remove inside hammer from cylinder, facing down, tap cylinder on a wood surface so it reaches end and then use magnet to pull out. The remaining hammer needs to remove interior clip from one of the access holes using small screwdriver to push end out of slot. Use a wire hook to yank out. Hardest part of reassembly was ensuring cylinder/shaft/shims/crankshaft aligned. After placing large snap ring onto shaft, use a pipe (pvc) that fits on the ring to pound it to overcome main spring and seat the ring into slot. These are not all tips, just additional to what is out there.

Replace seals on piston and weight in cylinder and any other applicable oil seals.

Remove top cover drain oil, handle, motor,chuck then remove piston, snap rings that hold barrel
Replace orings then
Reassemble

changed all O-rings in piston section

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 breakdown. 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.