5. HYDRAULIC DIAGRAM 5.6 AUXILIARY SERVICES CONTROL VALVE 5.6.3 DESCRIPTIONS OF COMPONENTS SPOOL RETURN DEVICE 1 2 D000 5040 1. Spool return spring 2. Spool CHECK VALVE (NR ) 3 B 4 1 R 2 5 D000 5050 1. Slide 2. Ball 3. Check valve spring 4. Valve seat 5. Spool 10-48