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HYDRAULIC SYSTEM and REACTION UNIT SERVICE

HYDRAULIC SYSTEM and REACTION UNIT SERVICE. Chapter 5 Page 98 Lab manual. DIAGNOSE HYDRAULIC and VACUUM CONTROL SYSTEMS. The best way to identify the exact cause of transmission problems is to use the results of a road test: Logic

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HYDRAULIC SYSTEM and REACTION UNIT SERVICE

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  1. HYDRAULIC SYSTEM and REACTION UNIT SERVICE • Chapter 5 • Page 98 • Lab manual

  2. DIAGNOSE HYDRAULIC and VACUUM CONTROL SYSTEMS • The best way to identify the exact cause of transmission problems is to use the results of a road test: • Logic • Oil charts circuit charts for the transmission being worked on. Page 98

  3. PRESSURE TESTS • If the road test does not find the problem, perform a pressure test. • Check minimum line in all ranges. • Check maximum line in all ranges. • What does that mean? Page 99

  4. TEST CHART

  5. VALVE BODY SERVICE • Drain transmission. • Remove valve body disassemble halves check for stuck valves. • Do NOT remove valves until you have found the problem. • Use a Polaroid camera for check ball location. Page 105

  6. CLEANING AND INSPECTION • Individual VB parts are not sold separately. • Use spray carb cleaner, WEAR EYE PROTECTION. • Place unlubricated valve in its bore, hold vertical it should fall out by its own weight. Page 107

  7. VALVEBODY REASSEMBLE • Use notes. • Photos • Manuals • Place valve body gaskets over separator plate, Gasket can NOT cover any holes in plate. • DO NOT OVERTIGHTEN VB BOLTS. Page 110

  8. GOVERNOR SERVICE • If diagnostic road test indicates a governor problem. • Remove, disassemble, clean, and inspect. • Two main types of governor problems, • Late shifts • Not starting in first gear from a stop. Page 111

  9. DISASSEMBLY • Most governors have a Primary and Secondary valve. • Valves should be free to move from their own weight. • Inspect drive gear, if it has one. • Clean thoroughly. Page 112

  10. REASSEMBLY • Do not mix up primary and secondary weights or springs. • Install valves correctly, see fig. 5-20. • If governor pressure gauge reads less than 2 PSI ValveBody problem. • If governor pressure gauge reads more than 2 PSI Governor problem. Page 112

  11. OIL PUMP SERVICE • The oil pump should be carefully inspected during overhaul, especially if Trans had low line pressure. Page 113

  12. DISASSEMBLY • Note position and direction of pump gears before removal. • Look at P5-5, P5-6, and P5-7. Page 114

  13. INSPECTION • Inspect the pump bore for scoring on both its bottom and sides. • A front pump bushing with two much clearance will allow gears to run off center. • Check stator splines for wear. • Check all bushings for wear and size. • Check halves for warpage. Page 116

  14. REASSEMBLY • Pump bushing and seal should be installed with proper driver. • Lube bushing and seal lip. • Coat pump gears in Trans fluid before assembly. • Use proper tools to align pump halves. Page 118

  15. BAND SERVICE • Single or double wrap designs. • Cast iron or flex type. • Do not flatten out flex band or lining may crack. Page 119

  16. INSPECTION • Look for chipping, cracks, burn marks, glazing, nonuniform wear patterns, and flaking. • The drum surface should be checked for discoloration, scoring, glazing, and distortion. • Cast drums should be sanded with 180-grit sandpaper. • The surface of the drum should be flat, check all stamped drums.

  17. BAND ADJUSTMENT • Every band must be adjusted when installed. • Some transmissions do not require periodic band adjustment. • Some use adjusting screws, and some use selective apply pins. • The timing of the band application has a lot to do with how the shift feels. page 120

  18. page 121

  19. SERVO and ACCUMULATOR • Some servos are serviceable in the car. • Some accumulators are serviceable in the vehicle. • One of the main problems are leaks. • Check bores for gouges and scoring. page 122

  20. ACCUMULATORS • Remove accumulator cover snap ring. • Remove cover, piston and spring. • Be sure to note order of disassembly. • Manuals may have poor pictures. • Piston in first or spring in first? • Check seals rubber, Teflon, or steel. page 122

  21. SERVOS • A servo is connected to a band. • Same checks as for a accumulator. page 123

  22. SEALS • Most original equipment servo seals are of the Teflon type. • Cast iron hook ring may be supplied as replacements. • Be sure to check ring size in the bore it goes in. • Check that the ring are free in ring groves. page 124

  23. INSPECTION Page 124

  24. ASSEMBLY Page 124

  25. SELECTIVE APPLY PINS Page 124

  26. CLUTCH PACKS • Two types of clutch packs: • Rotating drum - Case grounded • All clutch plates are held in place with snap rings, with some selective thickness. • There may be two or more snap rings of the same diameter but different thickness or shape. page 126

  27. DISASSEMBLY • Remove snap ring retaining the pressure plate. • Remove friction and steel plates. • Use clutch piston spring compressor to compress spring and remove snap ring. • Remove retainer, springs, and piston. • Note direction of seal installation. page 127

  28. INSPECTION AND CLEANING • Make sure that you keep the parts of each clutch separate. • Clean all parts, and air dry. • Check all splines. • Check retainers and springs. • Check wave plates for scoring, height. • Check ring groves, bushings on drums. page 132

  29. CLUTCH PACK REASSEMBLY • Install new seals and lube before installation. • Soak frictions in ATF prior to installation. • If clutch has a belleville spring the lower pressure plate must be rounded on the bottom side. page 135

  30. CLEARANCE CHECKS • Adjust clearance by: • Selective snap rings • Selective pressure plates • Selective apply rings • Oversize steel plates • Non shifting clutch packs have less clearance than shifting clutch packs. • Clutches with Belleville spring .025” max. page 139

  31. AIR TESTING • Check with drums on pump and, • Check before valve body is installed. page 140

  32. ONE-WAY CLUTCHES • The durability of these clutches relies on constant fluid flow during operation. • If failure has occurred trace lube circuit and verify volume and pressure. page 141

  33. ROLLER CLUTCHES • Check rollers for roundness. • Check springs for distortion. • Check races for any irregularities. • One spring for each roller. • Sand races with a crosshatch pattern. • Check for correct direction of operation. page 142

  34. SPRAG CLUTCHES • Sprag element can not be disassembled. • If an element falls out replace the sprag. • Check races for any irregularities. • Sand races with a crosshatch pattern. • Check for correct direction of operation. page 142

  35. TRANS COOLER SERVICE • Flush cooler at time of overhaul. • Check lines for leakage. • Check for rubbing on pan, crossmember, etc. • If the fluid can not circulate, it can not cool. • Some radiator Trans coolers have internal filters. page 142

  36. CASE STUDY • Understand basic theories. • Listen to everyone. • Believe no one. • Prove it to yourself.

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