DEMO - 1956-57 Fordomatic Car-Truck Shop ... - FordManuals.com

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8 Chapter One Construction and OperationFRONT CLUTCHb. Operation.FRONT CLUTCHPISTON(1) FRONT CLUTCH. The front clutch is operatedby fluid pressure against the front clutch piston. Thepiston is moved against a spring washer which increasesTURBINESHAFTthe "apply" force through lever action to lock the multiple disc clutch. When the clutch is applied the primarysun gear is locked to the turbine shaft to drive the primary sun gear. The primarysun gear is driven in allFLUIDPRESSUREFig. 12 Front Clutch5589forward speeds. The piston is returned to the releaseposition by the spring washer when the fluid pressure isremoved (Fig. 12).In Neutral, front clutch drum and steel plates arebeing driven while bronze plates are stationary. InReverse, the clutch is not applied but both steel andbronze plates are being driven at engine speed.(2) REAR CLUTCH. The rear clutch is operated byfluid pressure against the rear clutch piston. Movementof the piston compresses the release spring and locksdrum. One end of the band contacts the end of the bandadjusting screw and the opposite end is connected to therear servo.(4) FRONT SERVO. The front servo assembly consists of an aluminum servo body, front servopiston, piston guide, release spring, and an actuating lever. Theinner end of the lever contacts the front servo pistonstem and the outer end contacts the front band strut(Fig. 14).(5) REAR SERVO. The rear servo assembly consistsof a cast aluminum servo body, rear servo piston, accuthe multiple disc clutch. The rear clutch drive platesare splined to the front clutch drum and the drivenplates are connected to the secondary sun gear. Whenthe rear clutch is applied (in the reverse and in thedrive range high ratios) the secondary sun gear is driven.The piston is returned to the released position by therear clutch release spring (Fig. 13).In Neutral, rear clutch bronze plates are being drivenwhile steel plates are free. In Intermediate,rear clutchbronze plates are driven, but steel plates are held stationary. In Low, rear clutch bronze plates are drivenclockwise at engine speed while steel plates are drivenmulator piston spring, accumulator piston,rear servo recounterclockwise.lease spring, and an actuating lever. The inner end ofthe actuating lever contacts the accumulator piston andthe outer end engages one end of the rear band strut.(Fig. 15.)FRONTCLUTCHPISTON(3) BANDS. The front band encircles the drum ofthe secondary sun gear assembly. One end of the bandis anchored against a boss in the transmission case.The opposite end of the band engages a strut betweenthe band and front servo actuating lever. When theFRONT BANDFRONT SERVOFRONTCLUTCH- FLUIDFLUIDPRESSUREPRESSURE5590APPLY-Fig. 13Rear ClutchFig. 14Front Servo Operation
Section 3 Clutches, Bands, and ServosREAR BANDREAR SERVO(4)FRONT SERVO. The front servo piston ismoved by fluid pressure which exerts force against theinner end of the front servo actuating lever. Force istransmitted through a strut between the outer end ofthe lever and the end of the band to tighten the frontband around the drum. Under certain conditions, theservo is released by directing fluid pressure to the opposite side of the piston, assisted by release spring force(Fig. 14).(5) REAR SERVO. The rear servo assemblyuses anaccumulator piston and spring to cushion application ofAPPLYthe rear band. Fluid pressure is directed to the rear servopiston to force it inward. When the band contacts thedrum, cushioning is provided as the accumulator pistonspring is compressed. As the accumulator piston bottomsFig. 15Rear Servo Operation5580in the rear servo piston bore, the rear band is fullyapplied (Fig. 15).The clutches and bands are applied by pressure fromband is held tightly around the drum, it prevents thesecondary sun gear from turning. The front band isapplied in the intermediate ratio.The rear band is placed around a drum attached tothe hydraulic control system in the following combinations to obtain the desired gear ranges:RatioApplyNeutralNo Clutches or Bandsthe pinion carrier. One end of the rear band contacts astrut on the inner end of the rear band adjusting screw.The other end of the band engages the strut between theband and the rear servo actuating lever. The rear bandis applied in the low and reverse ratios.Intermediate (1.47:1)High (1:1)Low (2.40:1)Reverse (2:1)Front Clutch-Front BandFront Clutch-Rear ClutchFront Clutch-Rear BandRear Clutch Rear Band4. CONTROL SYSTEMsion operation to engine torque and driver preference,Several fluid pressures, which vary with throttle open(2) THROTTLE PRESSURE. To adjust transmis (engine torque).ing, road speed or manual selector position, are used inthe transmission control system. These fluid pressuresand their operation under various driving conditions areexplained in this section.throttle pressure is used in the control system.Throttle pressure is produced from control pressureby the throttle valve and is controlled by the compression on the throttle valve spring. Compression on thethrottle valve spring is controlled by accelerator pedala. Fluid Pressures.(1) PRESSURE SOURCE. Two pumps (Fig. 17)deliver fluid pressure to the transmission control system.The front pump, driven by the converter impeller, operates whenever the engine runs. The rear pump, drivenby the transmission output shaft, delivers fluid to thecontrol system, when the vehicle moves forward.The front pump has a greater capacity than the rearpump, since it must supply all the fluid to operate thetransmission at low speeds and in reverse.Both pumps deliver fluid pressure to the control pressure regulator and control valve body (Fig. 17). A regudepression.Throttle pressure will vary from zero (at closed throttle) to the same pressure as maximum control pressure(at wide-open throttle), as shown in Figs. 16 and 19.Throttle pressure is directed to the 2-3 valve andplug to oppose governor pressure, and therebyvary the 2-3 shift according to accelerator pedal depression.Throttle pressure is also directed to the orifice controlvalve to position it for two 3-2 downshift conditionsa downshift with closed throttle; a downshift with partial to full throttle.lated pressure, called control pressure, is available at(3) MODULATED THROTTLE PRESSURE. Inthe control valve bodywhenever the engine is runningor the vehicle is moving forward above approximately15 m.p.h.Dr (drive) and Lo a(low)modulated throttle pressure17) is directed to the compensator valve to adjustcompensator pressure to accelerator pedal depression
Page 1 and 2: FORDCAR-TRUCKFORD DIVISIONFORD MOTO
Page 3 and 4: FOREWORDThis manual contains comple
Page 5 and 6: Chapter ONECONSTRUCTION AND OPERATI
Page 7 and 8: point."Section 1Torque Convertermum
Page 9: Section 2PlanetaryGear TrainFRONT C
Page 13 and 14: Section 4 Control System 11driver d
Page 15 and 16: Section 4 Control System 13valve op
Page 17: Section 4 Control System 15valve to

DEMO - 1956-57 Fordomatic Car-Truck Shop ... - FordManuals.com

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