Pfaff 131 Owner's Manual - Page 11

I Fig. 16 20 . The Treadle Stand with ball-bearing pitman requires but little attendance. It will be sufficient to apply a drop of oil now and then to the crank points a and b, to the treadle stud c and the treadle bearings d (fig. 18). The ball-bearing of the pit man is filled at the factory with consistent grease, thus render ing lubrication unnecessary for a long time. Should it become necessary later on to lubricate the ball-bearing of the pitman, use only consistent grease, since the oil is flung out when sewing at high speed, thus soil ing your dress. Should the treadle work noisily after a certain time of use, this is due to play having arisen in the bearings. Tighten the bearing e with the special wrench sup plied with the machine, and the screw f of the treadle stud bearing (fig. 17). I Be careful that the treadle bearings do not become loose. If necessary, loosen one of the f two screws d and press the centre pin firmly to the treadle. Then tighten the fastening screw again. The crank points can also be adjusted by tightening the crank bearing a. Fig. 17 21