TM 10-3930-643-34 STEERING TROUBLESHOOTING  AND  MAINTENANCE. 9-7 l Steering Circuit Relief Valve. (Sheet 4 of 7) CLEANING/INSPECTION 11. 12. l TOXIC/FLAMMABLE Dry  cleaning  solvent  P-D-680,  used for cleaning parts, is toxic and flammable. Use  only  in  well ventilated areas. Wear protective goggles and gloves. Do not smoke or allow open flames or sparks in areas where cleaning solvent is used or stored. Avoid contact with eyes, skin or clothing. If contact with eyes is made, flush with cold water and seek medical attention  immediately. If contact with skin or clothing is made, flush with cold water. If you become  dizzy  while  using  cleaning solvent, get fresh air immediately. l COMPRESSED AIR HAZARD 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 all parts with cleaning solvent P-D-680. Dry thoroughly with compressed air. Refer to paragraph 2-8. Inspect all parts. Refer to para- graph 2-9. Go to sheet 5 9-55