TM 10-3930-671-24 10.7. Tilt Cylinder Maintenance Tilt Cylinder Drift Test .................................................................... F-471 Tilt Cylinder Adjustment  ................................................................ F-472 Tilt Cylinder Removal  .................................................................... F-473 Tilt Cylinder Mounting Installation .................................................. F-474 Tilt Cylinder Assembly Parts  ......................................................... F-476 Tilt Cylinder Overhaul .................................................................... F-477 Tilt Cylinder Installation  ................................................................. F-480 Tilt Cylinder Drift Test To check tilt cylinder drift, a rated capacity load is placed on  the  forks,  lifted  up  and  held  to  determine  how  much the  position  of  the  tilt  cylinder  rods  moves  or  changes (drifts) in a specified length of time. Refer   to   Section   2.   1,   Service   Specifications   for   tilt cylinder drift specifications. It  is  recommended  that  a  test  load,  made  up  of  a  full capacity load equally distributed on a 48" x 48" pallet, be used.  The  material  used  to  make  up  the  test  load  must be arranged (stacked) to provide load stability and must not extend beyond the pallet. It must be secured on the pallet. Refer to the truck nameplate for capacity rating. 1. Adjust     fork     width     to     maximum     which     will accommodate the test load. Space forks as wide as    possible    to    provide    even    distribution    of weight. 2. Position   the   load   on   forks.   Keep   forks   level during  pick  up.  Enter  pallet  with  test  load  as  far as possible; test load and/or pal let should be in contact with load back rest. 3. Raise    carriage    and    test    load    12-15    inches [305381  mm]  off  the  floor.  Tilt  the  upright  to  full back position. 4. Shut off the truck. Turn key switch OFF. 5. Measure  and  mark  the  initial  position  of  the  tilt cylinder rod (see Figure 1). Note An alternate procedure is to  measure  the  change  in  the inclined angle of the upright, using a protractor and level, or inclinometer. 6. Let upright with test load  stand  for  the  specified test time. 7. Mark  the  new  position  of  the  tilt  cylinder  rod  or upright. 8. Measure    the    change    in    dimension    or angle from the initial reference mark. Figure 1. 9. Compare   the   change   in   dimensions   with   the specifications. 10. Excessive   tilt   cylinder   drift   indicates   faulty   or worn  tilt  cylinder  seals.  Remove  tilt  cylinders  for inspection and repair, as necessary. F-471