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Page Title: 2-48. Pressure and Vacuum Check Valves.
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TM  55-4920-400-13 and pipe nipples from filter sump bodies. b. Cleaning, Inspection, and Repair. (1) Clean   parts,    except   the   gaskets,   with cleaning  solvent,  Federal  Specification  P-D-680  or equivalent (para. 2-33c), and dry with a clean lint- free cloth or clean, dry, compressed air. (2) Inspect  parts  for  cracks,  breaks,  deterio- ration, and damaged threads. (3) Repair or replace defective parts. c. Reassembly and Installation. (1) Install  pipe  nipples  and  elbows  on  sump filter bodies and install bodies. (2) Install filter, place gasket and bowl in pos- ition on filter sump body, and secure with clamp. (3) Install  tube  assemblies. 2-48. Pressure and Vacuum Check Valves.  Re- move  the  pressure  and  vacuum  check  valves  for cleaning and repair as follows: a.  Removal (1)  Remove  the  vacuum  filter  sump,  as  in- structed in paragraph 2-47. (2) Remove tube assembly and check valves. (3)  Remove  elbow  and  vacuum  check  valve. b.   Disassembly.   Disassemble   in   sequence   of index numbers (fig. 2-3). NOTE The  pressure  check  valve  has  a  re- tainer backup for -No. 4 “O” Ring and does  not  have  No.  2  “O  Ring c. Cleaning and Inspection. (1) Clean  the  parts,  except  the  O-rings  with cleaning  solvent,  Federal  Specification  P-D-680  or TT-T-291, and dry thoroughly with a clean, lint-free cloth or clean, dry, compressed air. (2) Inspect  parts  for  cracks,  breaks,  damage, deterioration, and damaged threads. (3)  Replace  the  valve  if  any  parts  are  de- fective, (4) Replace O-rings if damaged. d.  Reassembly.   Reassemble  valves  in  the  re- verse sequence of the index numbers (fig. 2-3). e. Installation. (1) Install  vacuum  check  valve  on  pump  and install elbow in check valve. (2) Install  pressure  check  valve  on  reservoir and tube assembly on check valve and elbow. (3) Install  vacuum  filter  sump  as  instructed in paragraph 2-47. 2-49.  Relief  Valves.  The  relief  valves  are  all  re- placed in a similar manner, as follows: a. Removal. (1) Remove  chassis  assembly  from  tester  case (para.  2-46). (2) Remove pressure filter sump as instructed in paragraph 2-47. (3) Remove  tube  assembly  pipe  tees,  elbows and pipe nipple from relief valves. (4) Remove  nuts,  lockwashers  and  screws  se- curing  relief  valve  to  chassis  and  remove  valve. (5) Remove  relief  valves  in  the  same  manner as  above. b. Cleaning and Inspection. (1)  Clean   the   parts   with   a   clean,   lint-free cloth  dampened  with  cleaning  solvent,  Federal Specification  P-D-680  or  equivalent,  and  dry  thor- oughly. (2)  Inspect  parts  for  breaks,  cracks,  loose screws, and damaged threads. 2-11

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