FIGURE 18. CENTRIFUGAL MECHANISM ASSEMBLY MOTOR REVERSWITCH When  replacing  the  switch  on  Models  J,  L  and R,  discard  any  plastic  shims  used  with  the  old  switch, Replacement switch includes an appropriate shim, when required.  Be sure to reuse steel bearing retainer. WEATHERPROOF HOIST Apply   Permatex   #2   (or   equal)   on   all   mating surfaces where gaskets are not used when reassembling. Check  to  see  that  control  station  gasket  and neoprene grommet are in good condition and in correct position when reassembling. GEARING Models JJ, LL, RR, JJ-2, LL-2 and RR-2 have a special  Liftwheel   (S-302),  Liftwheel   Gear  (S-303)  and Intermediate  Pinion  (S-325).    If  the  gear  train  in  these hoists   is   disassembled,   the   following   steps   must   be observed in order to properly orient the three parts when reassembling: 1. Assemble liftwheel gear to liftwheel.  NOTE: These parts have their splines keyed in such a way that they will go together, only one way. See Figure 19. 2. To   install   the   intermediate   pinion,   align   the arrows  that  are  stamped  on  the  pinion  and  lift-wheel gear so they point toward each other. 3. Check  operation  of  gear  train  by  rotating  the pinion  four  (4)  complete  revolutions;  liftwheel  gear  will turn  one  (1)  complete  revolution  and  the  arrows  will again be aligned as shown.  If the arrows do not align or there   is   binding   between   the   gear   teeth,   repeat   the above steps. 4. For  gearing  lubrication  instructions,  see  page 16. FASTENERS Models A thru H-2, tighten motor housing cover screws (S-108)   to   where   they   have   a   minimum   breakaway torque of 48 inch pound and the brake attaching screws (S-253)    have    50    inch    pound    minimum    breakaway torque. FIGURE 19. NON-CIRCULAR GEARING. Models  J  thru  RR-2  tighten  limit  switch  bracket attaching   screws   (S-213),   motor   end   bell   attaching screws   (S-411),   brake   attaching   screws   (S-253)   and hexagonal  brake  stud  (S-265)  to  where  they  have  a minimum breakaway torque of 50 inch pound. LOWER HOOK BLOCK PIN    When   removing   or   installing   the   lower   hook block pin (S-764), care must be taken so as to prevent damaging  the  pin  and/or  hook  block.    These  pins  are tapered  groove  pins  and  as  a  result  they  can  only  be removed  in  one  direction.    To  remove  the  pin,  a  V- Block,   drift   and   hammer   (or   slow   acting   press)   are required.  The drift should be the same diameter as the pin (5/16" diameter for Models, A, A-2, AA, AA-2, B, B- 2, C, C-2, F, and F-2:  and 3/8" diameter for Models J, J-2, L and L-2) and it should be placed on the small end of the pin.  The small end of the pin is the end opposite the  end  on  which  the  3  grooves  are  visible.   Place  the hook block in the V-Block and drive the pin out using the drift and a hammer or slow acting press. To re-install the pin, the parts must be arranged the same as they were when the pin was removed. To do  this,  use  the  small  end  of  the  pin  as  a  gage.  First check  the  holes  in  the  hook  block  body  and  determine which hole is the largest.  Place the hook block body in the  V-Block  with  the  larger  hole  on  top.    Next,  check each end of the hole in the lower hook chain block (S- 775) and determine which end is the largest.  Place the chain in the slot of the chain and insert the chain block, with  the  large  hole  on  top,  into  the  hook  block  body. Align the holes in the hook block body with the hole in the chain block and insert the small end of the pin in the hole.  Push the pin in by hand until it stops and then use P  hammer  or  slow  acting  press  to  drive  the  pin  into position  so  that  the  end  of  the  pin  is  flush  with  the outside surface of the hook block body. CAUTION:  These are special high strength pins . and under no circumstances should a pin of a different material be substituted. 28