TM 10-3930-659-34 5-9. TRANSMISSION CONTROL VALVE MAINTENANCE (Con’t). 10. Install two new preformed packings (74 and 76) on bushing (75). 11. Install new preformed packing (77) on guide ring (78). 12. Install bushing (75) and guide ring (78) on cylinder (73) with new retaining ring (79). 13. Install new preformed packing (81) on vent plug (82). 14. Install piston (80), vent plug (82), and pilot orifice (83) on cylinder (73). 15. Install new preformed packing (72) and piston (71) on cylinder (73). 16. Install breather (70) on clutch cutoff valve (69). 17. Install clutch cutoff valve (69) on valve block (31) with two screws (68). 5-72