TM 10-3930-675-20-2 0050 00-2 Table 1. Preventive Maintenance Checks and Services (PMCS) for the RT 240 RTCH - Continued. Item No. Interval Man- Hours Item To Check/ Service Procedure Equipment Not Ready/ Available If: 2 Quarterly (50 Hours or 90 Days) Transmission AOAP Oil Sampling Valve Access  remote  hydraulic  control  com- partment  and  take  sample  of  transmis- sion oil: a.  Ensure  transmission  is  at  operating temperature. b. Remove   cap   from   discharge   port. Clean sampling valve port with rag. c.  Open and close knob of valve suffi- ciently  to  allow  approximately  2  oz (60  ml)  of  oil  to  be  collected  into suitable container. Discard oil. d. Open   and   close  knob   of   valve  to allow   sample   to   be   collected   into clean sample bottle approximately 1/2 in (1.3 cm) below neck of sample bot- tle. e.  Install   cap   on   discharge   port   and check for leaks. 3 Quarterly (300 Hours) Engine Oil Filter Access engine compartment and change engine oil filter: a.  Start  engine  and  bring  to  operating temperature (TM 10-3930-675-10). b. Shut   down   engine   (TM   10-3930- 675-10). Drain engine oil and replace filter (LO 10-3930-675-12). WARNING DO  NOT  perform  fuel  system  checks,  inspections  or  maintenance while smoking or near fire, flame or sparks. Fuel may ignite, causing damage to vehicle and injury or death to personnel. 4 Quarterly (300 Hours) Engine Fuel Filter/Water Separator a.  Replace   fuel   filter/water   separator (WP 0058 00). b. Inspect fuel lines, fuel tank, and fuel system   components   for   leaks   and damage. If authorized, replace dam- aged components.