TM 10-3930-653-14&P At  the  drive  shaft  side,  an  oil  seal  is  press-fitted  into  the  pump  body  to  provide  oil  tightness  performance.    Oil tightness between the pump body and the pump cover is secured with a specially shaped packing. CONTROL VALVE The control valve consists of five(5) valve housings,three(3)plungers and one (1) relief valve.  Each plunger and plunger housing are sandwiched by the inlet housing and outlet housing, which are all assembled with three stud bolts and nuts.  The inlet housing contains the cartridge type relief valve. (1) Plunger Operation (a) Neutral Position Oil discharged from the pump returns through the neutral passage to the tank. Fig.  4-467. (b) Pushing in of Plunger The   neutral   passages   are   closed   and   the   oil   passes through  the  parallel  feeder  and  flows,  pushing  up  the load check valve into the cylinder port "B". The returning oil   from   the   cylinder   port   "A"   flows   through   the   low- pressure passage to the tank.  The plunger is restored to the neutral position by the return spring. Fig.  4-468. 4-236