TM 10-3930-669-20 17-6.  TILT CYLINDER REPLACEMENT (CONT). (7) Using  a  leveling  device  on  back  of  stationary channel, measure rear tilt.  If rear tilt is greater than  6.4  degrees,  shorten  both  tilt  cylinders  (9) and    perform    Steps    (4)    through    (6)    above. Otherwise go to Step (8) below. (8) Pull   boot   (16)   over   each   tilt   cylinder   (9)   and tighten clamp (15). (9) Tighten  screw  (13)  on  clevis  (14)  on  each  tilt cylinder (9). (10) Lower  mast  (11)  so  that  fork  tips  are  on  the ground. NOTE Follow-on Maintenance: · Pivot mast to front (TM 10-3930- 669-10). · Remove wheel chocks (TM 10- 3930-669-10). END OF TASK 17-26