TM 5-3895-373-20 CHAPTER 13 HYDRAULIC LIFT COMPONENTS MAINTENANCE Para Page General Maintenance Procedures......................................................................................... 13.1 13-1 Repair Hydraulic Reservoir.................................................................................................... 13.7 13-42 Replace High Speed Shift and Brake Valve Solenoid Assemblies and Stack Valve Electrical Coils .................................................................................... 13.5 13-26 Replace Hydraulic Return Filter Assembly............................................................................ 13.6 13-35 Replace/Repair Vibration Relief Valve .................................................................................. 13.4 13-18 Replace Screed Lift Cylinder................................................................................................. 13.3 13-11 Replace Tow Point Cylinder .................................................................................................. 13.2 13-2 13.1. GENERAL MAINTENANCE PROCEDURES. All    unit     level     maintenance     shall     be     performed     in accordance with good and safe shop practices.  Observe the following general instructions and requirements when performing hydraulic lift components maintenance. a. Areas of the paving machine exposed to paving material  buildup  require  cleaning  prior  to  disassembly. Use hammers, chisels, and scrapers to remove thickest sections of buildup.  If available, use heater gun to soften deposits    adhering    to    components;    remove    softened buildup  with  putty  knife.    When  heating  paving  material, keep  second  person  with  fire  extinguisher  at  hand  and avoid  overheating.    If  heater  gun  is  not  available,  use solvent    or    fuel    washdown    system    to    soften    paving material. b. Thoroughly   clean   hydraulic   hoses   and   fittings before disconnecting. Always plug or cap off disconnected   fittings   to   prevent   dirt   and   contaminants from  entering  the  system.    Failure  to  clean  hoses  and fittings  and  to  plug  or  cap  open  fittings  may  result  in hydraulic system contamination and equipment damage. c. Always tag mating connectors and fittings before disconnecting.  Tagging of mating connectors and fittings will ease reassembly and reduce assembly errors. d. Use    a    backup    wrench    when    loosening     or tightening   inline   fittings.      Using   a   backup   wrench   will prevent  unnecessary  damage  to  attached  lines  and/or smaller fittings. e. When removing tie wraps from hoses and wiring, note  or  mark  locations  and  anchor  points.    The  proper location  and  installation  of  tie  wraps  will  prevent  undue chafing of hoses and wiring. f. Thread   locking   compound   is   used   with   most threaded fasteners.  If a threaded fastener will not break loose, heat fastener from 500° to 600°F (232° to 315°C) with  heater  gun.    If  the  special  solvent  used  to  remove thread  locking  compound  from  screw  threads  fails  to remove buildup, discard fastener. g.    Discard  all  removed  gaskets,  seals,  preformed packings,   self-locking   nuts,   lockwashers,   spring   pins, and deformed hardware. h.    Inspect   all   removed   components   for   obvious wear  or  damage.    Replace  all  worn,  bent,  broken,  or otherwise damaged parts. i.    Inspect     all     removed     fasteners     for     thread damage.    If  thread  damage  is  found,  replace  fastener. Replace   flat   washers   if   galled   or   bent.      Use   screw extractor  set  (Item  15,  Appendix  E)  to  remove  broken studs or screws. j.    Clean     painted     surfaces     thoroughly     before repainting.  Do not paint over rust or corrosion.  Cover air breather ports and hydraulic components.  Do not paint bearings  or  other  parts  that  require  surface  lubrication. Reference TM 43-0139 for equipment painting requirements. k.    Torque values cited in the text apply to modified SAE Grade 8 fasteners at required clamping loads. l.    Use only authorized replacement parts.  Refer to TM 53895-373-24P, Repair Parts and Special Tools List (RPSTL) for authorized replacement parts. m.    Observe   all   warnings   and   cautions.      Wear protective clothing and equipment as specified.  Observe the  Safety  and  Hazard  Warnings  provided  in  TACOM technical bulletin TB 43-0216. 13-1