TM 5-3825-226-24PLANETARY TRANSMISSIONThe transmission has four speeds FORWARDand two speeds REVERSE. It has planetary gearsystems and six hydraulic clutches. The No. 6 clutch isa rotating clutch and acts as the output member. Itfastens to the output gear.The transmission output gear is connected tothetransfer gear with splines. The transfer gear isconnected with splines to the output shaft. The outputshaft is connected by a yoke and universal joint to thedrive shaft.CLUTCH OPERATION1. Piston. 2. Springs. 3. Plates. 4. Ring gear. 5.Discs. 6. Clutch housing.The six transmission clutches are the disc typeand in separate housings. Each clutch has discs (5) andplates (3). The inside teeth of discs (5) are engagedwith the outside teeth of ring gear (4). Notches on theoutside diameter of plates (3) are engaged with pins inthe clutch housing. The pins keep the plates fromturning.The springs (2) are between clutch housing (6)and piston (1). The springs keep the clutchesdisengaged (not engaged). The clutches are engagedwhen oil is sent into the area behind piston (1). Whenthe pressure of the oil in the area behind the pistonincreases, the piston moves to the right. The pistonmoves against the force of springs (2) and pushes thediscs and plates together. The clutch is now engaged.The discs keep ring gear (4) from turning. When theclutch is released, the pressure in the area behind piston(I) decreases and the springs now push the piston to theleft. The discs and plates are now apart. The clutch isnot engaged.CLUTCH IDENTIFICATIONThe three front clutches (No. I1, No. 2 and No.3) are direction clutches. The No. 2 clutch is theREVERSE direction clutch. The No. I and No. 3clutches are the FORWARD direction clutches. Thethree rear clutches (No. 4, No. 5 and No. 6) are speedclutches. No. I clutch is a direction clutch for FOURTHFORWARD speed.A speed and a direction clutch must be engagedin the transmission before power goes through thetransmission.CLUTCH IDENTIFICATIONNOTE: No. 6 clutch Is Inside output transfer gearcase.2-82
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