Section One · Pages 5–14 (10 pages)

Fundamentals of Operation

From the 1946–1955 General Motors Hydra-Matic On-the-Car Adjustment Service Manual

How the Hydra-Matic works mechanically, as background for the adjustments. The fluid coupling replaces the clutch and drives the front, rear and reverse planetary units. Illustrations show how a planetary gearset gives reduction, reverse, direct drive and neutral, how bands and hydraulic servos hold drums, how clutch pistons lock a unit into direct drive, and the band and clutch application chart for neutral, first through fourth speed and reverse. The hydraulic system is not covered.

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What this section covers

  • Fluid coupling, main shaft and output shaft
  • Front, rear and reverse planetary units
  • Planetary gear reduction, reverse and direct drive
  • Band and servo operation
  • Clutch application
  • Band and clutch application by speed
Year
1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955
Make
Cadillac, Chevrolet, General Motors, GMC, Hudson, Kaiser, Lincoln, Nash, Oldsmobile, Pontiac, Willys
Vehicle
Components and Systems, Hydra-Matic, Light Duty Trucks, Passenger Cars, Transmissions, Trucks
Type
Service Manual
Models
Hydra-Matic transmissions 1946–1955; Chevrolet and GMC 1/2–1 ton trucks
Publication
J 6372
Pages
76

What’s inside

Manual

  1. Contents and ForewordCover, table of contents with ordering details for manual J 6372, and a foreword explaining that the procedures use Kent-Moore special tools and cover about 75% of Hydra-Matic service.pp. 1–4
  2. OneFundamentals of Operationpp. 5–14
  3. TwoChecking and Diagnosispp. 15–26
  4. ThreeOn-the-Car Service and Adjustment Instructionspp. 27–68
  5. FourReference Chartspp. 69–76

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