NATEF Task Area A2 - Grafton School District · NATEF Task Area A2 Automatic Transmission & Transaxle D. Off Vehicle Transmission & Transaxle Repair 4. Friction & Reaction Units Inspect

NATEF Task Area A2 Automatic Transmission

• A. General Transmission & Transaxle Diagnosis

• B. Transmission & Transaxle Maintenance & Adjustment

• C. InVehicle Transmission & Transaxle Repair

• D. OffVehicle Transmission & Transaxle Repair

NATEF Task Area A2 Automatic Transmission & Transaxle A. General Transmission & Transaxle Diagnosis

Complete work order to include customer information, vehicle identifying information, verify customer concern, related service history, cause, & correction.

A2.A.1


Identify & interpret transmission/transaxle concern, assure proper engine operation; determine necessary action.

A2.A.2


Research applicable vehicle and service information, such as transmission/transaxle system operation, fluid type, vehicle service history, service precautions, and technical service bulletins.

A2.A.3


Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals)

A2.A.4


Diagnose unusual fluid usage, level, and condition concerns; determine necessary action.

A2.A.5


Perform pressure tests; determine necessary action. A2.A.6


Perform stall test; determine necessary action. A2.A.7


Perform lockup converter system tests; determine necessary action. A2.A.8


Diagnose mechanical and vacuum control system concerns; determine action. A2.A.9


Diagnose noise and vibration concerns; determine necessary action. A2.A.10


Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles.

A2.A.11


Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles.

A2.A.12

Carrier drives = overdrive Carrier driven = reduction Carrier held = reverse Two members held = direct drive Nothing driven or held = neutral Parking Pawl engaged to the output shaft = park


Diagnose electrical/electronic concerns using principles of electricity (Ohms' Law) A2.A.13

NATEF Task Area A2 Automatic Transmission & Transaxle B. Transmission & Transaxle Maintenance & Adjustment

Inspect, adjust or replace throttle valve (TV) linkages or cables, manual shift linkages or cables; transmission range sensor; check gear select indicator (as applicable).

A2.B.1

NATEF Task Area A2 Automatic Transmission & Transaxle B. Transmission & Transaxle Maintenance & Adjustment

Service transmission; perform visual inspection; replace fluids and filters. A2.B.2

NATEF Task Area A2 Automatic Transmission & Transaxle C. InVehicle Transmission & Transaxle Repair

Inspect, adjust or replace (as applicable) vacuum modulator; inspect and repair or replace lines and hoses.

A2.C.1


Inspect, repair, and replace governor assembly. A2.C.2


Inspect and replace external seals and gaskets. A2.C.3


Inspect extension housing, bushings and seals; perform necessary action. A2.C.4


Inspect and replace speedometer drive gear, driven gear, vehicle speed sensor (VSS), and retainers.

A2.C.5


Diagnose electronic transmission control systems using a scan tool; determine necessary action.

A2.C.6


Inspect, replace, and align powertrain mounts. A2.C.7

NATEF Task Area A2 Automatic Transmission & Transaxle D. OffVehicle Transmission & Transaxle Repair 1. Removal, Disassembly, and Reinstallation

Remove and reinstall transmission and torque converter (rearwheel drive). A2.D.1.1


Remove and reinstall transaxle and torque converter assembly. A2.D.1.2


Disassemble, clean, and inspect transmission & transaxle. A2.D.1.3


Inspect, measure, clean, and replace valve body (includes surfaces and bores, springs, valves, sleeves, retainers, brackets, checkballs, screens, spacers, and gaskets), and torque valve body bolts.

A2.D.1.4


Inspect servo bore, piston, seals, pin, spring, and retainers; determine necessary action.

A2.D.1.5


Inspect accumulator bore, piston, seals, spring, and retainer; determine necessary action.

A2.D.1.6


Assemble transmission/transaxle. A2.D.1.7


Assemble transmission/transaxle. A2.D.1.8

NATEF Task Area A2 Automatic Transmission & Transaxle D. OffVehicle Transmission & Transaxle Repair

2. Oil Pump & Torque Converter Inspect converter flex plate, attaching parts, pilot, pump drive, and seal areas. A2.D.2.1


2. Oil Pump & Torque Converter Measure torque converter endplay and check for interference; check stator one way clutch

A2.D.2.2


2. Oil Pump & Torque Converter Inspect, measure, and replace oil pump (F & R) assembly and components. A2.D.2.3


3. Gear Train, Shafts, Bushings, & Transmission Case Measure endplay or preload; determine necessary action. A2.D.3.1


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect, measure, and replace thrust washers and bearings. A2.D.3.2


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect, measure, and replace thrust washers and bearings. A2.D.3.3


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect bushings; determine necessary action. A2.D.3.4


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect and measure planetary gear assembly (includes sun, ring gear, thrust washers, planetary gears. and carrier assembly); determine necessary action.

A2.D.3.5


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect case bores, passages, bushings, vents, and mating surfaces; determine necessary action.

A2.D.3.6


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect transaxle drive, link chains, sprockets, gears, bearings, and bushings; perform necessary action.

A2.D.3.7


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect, measure, repair, adjust or replace transaxle final drive components. A2.D.3.8


3. Gear Train, Shafts, Bushings, & Transmission Case Inspect and reinstall parking pawl, shaft, spring, and retainer; determine necessary action.

A2.D.3.9


4. Friction & Reaction Units Inspect clutch drum, piston, checkballs, springs, retainers, seals, friction and pressure plates; determine necessary action.

A2.D.4.1


4. Friction & Reaction Units Measure clutch pack clearance; determine necessary action. A2.D.4.2


4. Friction & Reaction Units Air test operation of clutch and servo assemblies. A2.D.4.3


4. Friction & Reaction Units Inspect roller and sprag clutch, races, rollers, sprags, springs, cages, and retainers; determine necessary action.

A2.D.4.4


4. Friction & Reaction Units Inspect bands and drums; determine necessary action. A2.D.4.5

Documents

NATEF Task Area A2 - Grafton School District · NATEF Task Area A2 Automatic Transmission & Transaxle D. Off Vehicle Transmission & Transaxle Repair 4. Friction & Reaction Units Inspect