I bought this old girl in 2006 used from a company that was having a going out of business sale, best info from Milwaukee is it was made between 1989 and 1992. Initially it looked like a set of brushes and a power cord but it was loud and rough so I took it apart and found someone had been in there before. They removed one side of the bearing rubber seal and used red and tacky grease as well as damaging the spindle and putting a small crack in the housing.
That was a dilemma $65-75 in parts or toss it, it is a real made in USA Milwaukee not a Chinese TTI, the field, armature, case and upper housing all okay, no scorch marks or melting around the brush holders or rear bearing. I decided to repair it and ran into issues right away, they still sell parts for this but the bearings are Chinese "Peer" brand they use in the newer TTI stuff and they are notorious for failing, what grease to use?
I found NOS USA brushes and a gear set, a lower housing from a little later series but dimensional the same and a NOS spindle.
Not being able to make heads or tails out of the bearing number and letter salad I called SKF, they were very helpful, the make a low friction seal bearing especially for hammer drills and angle grinders, they are the 2RSL (2 Rubber Seals Low friction) models and C3 rated for high speed.
I bought 3 SKF bearings and a INA USA needle bearing from an authorized local bearing supplier, no ebay or amazon bearings, they claim 30-40% are fakes.
It turns out Mobilux EP1 NLGI 1 is the exact spec grease Milwaukee spec'd for this probably because of the needle bearing in the head.
After assembly I used prussian blue on the gear set and found it needed a shim to get the pattern just right. It runs incredibly smooth and turns very easy by hand, it is quiet for a grinder and runs cool at the head. There is one thing, it claims it is only 5.5 amp, this must be true power output because it has more power than my 2007 7.5A Makita, like the old 5A hole shooter drill had less power on the label but was a genuine wrist breaker more so than the TTI 8A. All in all it was worth it to me, it was a fun and educational simple job but you do need a decent press.
Milwaukee still has a grease chart for the tools inc the old timers.
Some info of SKF seals.
The first gear pics are worn and got thrown out along with the old spindle and cracked housing. The commutator looks perfect, it only need a little clean up with 2000.
That was a dilemma $65-75 in parts or toss it, it is a real made in USA Milwaukee not a Chinese TTI, the field, armature, case and upper housing all okay, no scorch marks or melting around the brush holders or rear bearing. I decided to repair it and ran into issues right away, they still sell parts for this but the bearings are Chinese "Peer" brand they use in the newer TTI stuff and they are notorious for failing, what grease to use?
I found NOS USA brushes and a gear set, a lower housing from a little later series but dimensional the same and a NOS spindle.
Not being able to make heads or tails out of the bearing number and letter salad I called SKF, they were very helpful, the make a low friction seal bearing especially for hammer drills and angle grinders, they are the 2RSL (2 Rubber Seals Low friction) models and C3 rated for high speed.
I bought 3 SKF bearings and a INA USA needle bearing from an authorized local bearing supplier, no ebay or amazon bearings, they claim 30-40% are fakes.
It turns out Mobilux EP1 NLGI 1 is the exact spec grease Milwaukee spec'd for this probably because of the needle bearing in the head.
After assembly I used prussian blue on the gear set and found it needed a shim to get the pattern just right. It runs incredibly smooth and turns very easy by hand, it is quiet for a grinder and runs cool at the head. There is one thing, it claims it is only 5.5 amp, this must be true power output because it has more power than my 2007 7.5A Makita, like the old 5A hole shooter drill had less power on the label but was a genuine wrist breaker more so than the TTI 8A. All in all it was worth it to me, it was a fun and educational simple job but you do need a decent press.
Milwaukee still has a grease chart for the tools inc the old timers.
Some info of SKF seals.
The first gear pics are worn and got thrown out along with the old spindle and cracked housing. The commutator looks perfect, it only need a little clean up with 2000.
