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TM 9-2815-202-34 d. Lapping NOTE Check valve only requires one lapped side. Turn over to utilize unused side. New parts do not require lapping prior to use. Following list of used parts may require lapping: check valve cage (17), bushing (20), valve spring cage (14), and spray tip (33). Lap components using  following  procedure: (1) (2) (3) (4) (5) (6) (7) (8) WARNING Compressed  air  used  for  cleaning  purposes  will  not  exceed  30  PSI.  Use  only with  effective  chip  guarding  and  personal  protective  equipment  (goggles/shield, gloves,   etc.) Clean lapping block set (34) with compressed air. Do not use cloth or any other-material for this purpose. Spread 600 grit dry lapping powder on lapping block (34). CAUTION Ensure no lapping compound is accidently placed on the lapped surfaces located higher up in the spray tip. The slightest lapping action on these surfaces can alter the near perfect fit between the needle valve and tip. Place part flat on lapping block (34). Using figure-eight motion, move part back and forth across block. Do not press on part. Apply only enough pressure to keep part flat on block. Keep part flat on block at all times. After five passes, draw part across a clean piece of tissue placed on flat surface and clean lapping powder from it. Inspect part and continue lapping if necessary. Do not lap excessively. WARNING Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and  gloves  and  use  in  a  well-ventilated  area.  Avoid  contact  with  skin,  eyes,  and clothes. Do not breathe vapors. Do not use near open flame or excessive heat. The  flash  point  is  100-138°F  (38-50oC).  If  you  become  dizzy  while  using  cleaning solvent, get fresh air immediately and seek medical aid. If contact with eyes is made, wash with water and get medical aid immediately. When part is flat, wash in cleaning solvent and dry with compressed air. Place part on second block (34). Apply 600 grit lapping powder to block and repeat steps (3) and (6). Place part on third block (34). Do not apply lapping powder to this block and repeat steps (3) and (6). Change   1 4-229


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