Automatic Transmission Unit: Inspection

1. Using vernier calipers, measure the free length of the spring together with the spring seat.

Standard free length: 23.74 mm (0.935 in.) 

If the free length is shorter than the standard free length, replace the brake piston return spring sub-assembly.

Fig 1: Measuring Free Length Of Spring With Spring Seat Using Vernier Calipers

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Using a feeler gauge, measure the rear planetary gear pinion thrust clearance.

   Standard clearance: 0.2 to 0.6 mm (0.008 to 0.024 in.) 

   If the clearance is greater than the standard clearance, replace the planetary gear assembly.

   Fig 2: Measuring Rear Planetary Gear Pinion Thrust Clearance Using Feeler Gauge

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Using a dial indicator, measure the inside diameter of the rear planetary gear bushing.

   Standard inside diameter: 20.025 mm (0.7884 in.) 

   If the inside diameter is greater than the standard inside diameter, replace the rear planetary gear assembly.

Fig 3: Measuring Inside Diameter Of Rear Planetary Gear Bushing Using Dial Indicator

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1. Make sure that the 1st and reverse brake piston moves smoothly when pulling and releasing the compressed air gun lever while applying compressed air into the transmission case.
   Fig 4: Applying Compressed Air Into Transmission Case

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Using vernier calipers, measure the level difference (dimension A) between the upper surface of the brake apply tube and the hitting surface of the No. 4 brake flange at both ends across the 1st and reverse brake piston diameter, and calculate the average.
   Fig 5: Measuring Level Difference Between Upper Surface Of Brake Apply Tube & Hitting Surface Of No. 4 Brake Flange

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   NOTE: The 1st and reverse brake piston must be securely installed to the end face of the transmission case.

   HINT:

   Dimension A = 22.05 to 22.91 mm (0.8681 to 0.9020 in.)

3. Using vernier calipers, measure the thickness (dimension B) of the brake flanges, the 4 No. 4 brake plates and the 4 No. 4 brake discs altogether at both ends across a diameter, and calculate the average.
   Fig 6: Measuring Thickness (Dimension B) Of Brake Flanges

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   HINT:

   Dimension B = 23.11 to 23.89 mm (0.9098 to 0.9405 in.)

   Pack Clearance = Dimension A - Dimension B - 0.22 mm (0.0087 in.) + 1.8 mm (0.071 in.)

   Pack Clearance: 0.4 to 0.7 mm (0.016 to 0.028 in.) 

4. If the pack clearance is outside the standard range, select and install a brake flange that brings the pack clearance to be within the standard range.

   HINT:

   There are 8 types of flanges that can be used to adjust the pack clearance. Select the one with the most appropriate thickness.

   Thickness H 

   THICKNESS H SPECIFICATIONS
   
   

   NO.	Thickness H	NO.	Thickness H
   0	0 mm (0 in.)	8	0.8 mm (0.03150 in.)
   2	0.2 mm (0.00787 in.)	10	1.0 mm (0.03937 in.)
   4	0.4 mm (0.01575 in.)	12	1.2 mm (0.04724 in.)
   6	0.6 mm (0.02362 in.)	14	1.4 mm (0.05512 in.)

1. Check whether the sliding surfaces of the 4 discs, the 4 plates, and the flange are worn or burnt. If necessary, replace them.
   Fig 7: Inspecting No. 4 Brake Disc

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   NOTE:

   • If the linings of the discs are peeled off or discolored, or if any part of the printed numbers is damaged, replace all discs.
   • Before assembling new discs, soak them in ATF for at least 15 minutes.

1. Using a dial indicator, check the intermediate shaft runout.

   Standard runout: 

   A: 0.03 mm (0.0012 in.) 

   B: 0.03 mm (0.0012 in.) 

   C: 0.03 mm (0.0012 in.) 

   D: 0.03 mm (0.0012 in.) 

   Fig 8: Checking Intermediate Shaft Runout Using Dial Indicator

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   If the runout exceeds the specification, replace the intermediate shaft with a new one.

2. Using a micrometer, check the outer diameter of the intermediate shaft at each point shown in Fig 9 .

   Standard diameter: 

   A: 25.962 to 25.975 mm (1.022 to 1.023 in.) 

   B: 25.962 to 25.975 mm (1.022 to 1.023 in.) 

   C: 32.062 to 32.075 mm (1.262 to 1.263 in.) 

   D: 32.062 to 32.075 mm (1.262 to 1.263 in.) 

   Fig 9: Checking Outer Diameter Of Intermediate Shaft At Each Point Using Micrometer

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   If the outer diameter is outside the standard range, replace the intermediate shaft with a new one.

1. Using a dial indicator, measure the inside diameter of the rear planetary ring gear bushing.

   Standard inside diameter: 32.19 mm (1.2673 in.) 

   If the inside diameter is greater than the standard inside diameter, replace the rear planetary ring gear.

Fig 10: Measuring Inside Diameter Of Rear Planetary Ring Gear Bushing Using Dial Indicator

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Hold the rear planetary ring gear flange sub-assembly and turn the one way clutch assembly.
2. Check that the one way clutch assembly turns freely counterclockwise and locks clockwise.

   If there is a problem with the one way clutch, replace the one way clutch.

Fig 11: Checking One Way Clutch Assembly Turns Freely Counterclockwise & Locks Clockwise

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1. Using a feeler gauge, measure the center planetary gear pinion thrust clearance.

   Standard clearance: 0.12 to 0.68 mm (0.005 to 0.027 in.) 

   If the clearance is greater than the standard clearance, replace the center planetary gear assembly.

Fig 12: Measuring Center Planetary Gear Pinion Thrust Clearance Using Feeler Gauge

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Check whether the sliding surfaces of the 4 discs, the 4 plates, and the flange are worn or burnt.

   If necessary, replace them.

Fig 13: Inspecting No. 2 Brake Disc

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Using vernier calipers, measure the free length of the spring together with the spring seat.
   Fig 14: Measuring Free Length Of Spring Together With Spring Seat Using Vernier Calipers

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Standard free length: 17.45 mm (0.687 in.) 

   If the free length is shorter than the standard free length, replace the No. 2 brake piston return spring sub-assembly.

1. Inspect the piston stroke of the No. 2 brake piston.
   1. Make sure that the No. 2 brake piston moves smoothly when pulling and releasing the compressed air gun lever while applying compressed air into the transmission case.
      Fig 15: Applying Compressed Air Into Transmission Case

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   2. Using SST and a dial indicator, measure the moving distance (distance A) of the clutch disc at both ends across a diameter while blowing air from the oil hole and calculate the average.
      Fig 16: Measuring Moving Distance (Distance A) Of Clutch Disc At Both Ends Across Diameter

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      SST 09350-30020 (09350-06120) 

      Piston Stroke: 0.45 to 0.75 mm (0.0177 to 0.0295 in.) 

   3. If the piston stroke is outside the standard range, select and install a brake flange that brings the piston stroke within the standard range.

HINT:

There are 8 types of flanges that can be used to adjust the pack clearance. Select one with the most appropriate thickness.

Flange thickness 

Fig 17: Measuring Free Length Of Spring Together With Spring Seat

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Using vernier calipers, measure the free length of the spring together with the spring seat.

Standard free length: 17.05 mm (0.671 in.) 

If the free length is shorter than the standard free length, replace the brake piston return spring sub-assembly.

1. Using a feeler gauge, measure the front planetary pinion gear thrust clearance.

   Standard clearance: 0.20 to 0.60 mm (0.008 to 0.024 in.) 

   If the clearance is greater than the standard clearance, replace the front planetary gear assembly.

   Fig 18: Measuring Front Planetary Pinion Gear Thrust Clearance Using Feeler Gauge

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Using a dial indicator, measure the inside diameter of the front planetary gear bushing.

   Standard inside diameter: 57.43 mm (2.261 in.) 

   If the inside diameter is greater than the standard inside diameter, replace the front planetary gear assembly.

Fig 19: Measuring Inside Diameter Of Front Planetary Gear Bushing Using Dial Indicator

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Install the one way clutch assembly to one way clutch inner race.
2. Hold the one way clutch inner race and turn the one way clutch assembly.
3. Check that the one way clutch assembly turns freely counterclockwise and locks clockwise.
   Fig 20: Checking One Way Clutch Assembly Turns Freely Counterclockwise & Locks Clockwise

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   If there is a problem with the one way clutch, replace the one way clutch.

4. Remove the one way clutch assembly from the one way clutch inner race.

1. Inspect the piston stroke of No. 1 brake piston.
   1. Make sure that the No. 1 brake piston moves smoothly when pulling and releasing the compressed air gun lever while applying compressed air into the transmission case.
      Fig 21: Applying Compressed Air Into Transmission Case

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   2. Using vernier calipers, measure the level difference (dimension A) between the upper surface of the No. 1 brake piston and the hitting surface of the No. 1 brake flange at both ends across the No. 1 brake piston diameter.
   3. Using vernier calipers, measure the thickness (dimension B) of the brake flange, the 3 No. 1 brake plates and the 3 No. 1 brake discs altogether at both ends across a diameter, and calculate the average.

Fig 22: Measuring Level Difference Between Upper Surface Of No. 1 Brake Piston & Hitting Surface Of No. 1 Brake Flange

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

Dimension A = 15.29 to 15.77 mm (0.6020 to 0.6209 in.)

Dimension B = 14.72 to 15.12 mm (0.5795 to 0.5953 in.)

Piston stroke = Dimension A - Dimension B

Piston stroke: 0.42 to 0.72 mm (0.017 to 0.028 in.) 

If the piston stroke is outside the specified range, parts may have been assembled incorrectly, so check and reassemble them again.

If the piston stroke is still outside the specified range, select another flange that brings the piston stroke within the specified range.

HINT:

There are 4 different thicknesses for the flange.

Flange thickness 

1. Check whether the sliding surfaces of the 3 discs, the 3 plates or the flange are worn or burnt. If necessary, replace them.
   Fig 23: Inspecting No. 1 Brake Disc

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   NOTE:

   • If the linings of the discs are peeled off or discolored, or if any part of the groove is damaged, replace all discs.
   • Before assembling new discs, soak them in ATF for at least 15 minutes.

1. Using vernier calipers, measure the free length of the spring together with the spring seat.

Standard free length: 15.72 mm (0.619 in.) 

If the free length is shorter than the standard free length, replace the No. 3 brake piston return spring sub-assembly.

Fig 24: Measuring Free Length Of Spring Together With Spring Seat Using Vernier Calipers

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. Check whether the sliding surfaces of the 4 discs, the 4 plates or the flange are worn or burnt. If necessary, replace them.

Fig 25: Inspecting 2nd Brake Disc Set

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1. Hold the reverse clutch hub and turn the No. 2 one way clutch assembly.
2. Check that the No. 2 one way clutch assembly turns freely clockwise and locks counterclockwise. If there is a problem with the one way clutch, replace the one way clutch.

Fig 26: Checking No. 2 One Way Clutch Assembly Turns Freely Clockwise & Locks Counterclockwise

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1. Check the operating sound while applying compressed air into the oil holes indicated in Fig 27 .

HINT:

When inspecting the O/D direct clutch, check the operating sound with the C3 accumulator piston hole closed.

If there is no sound, disassemble and check the installation condition of the parts.

Fig 27: Identifying Oil Holes Location

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

1. No. 2 Clutch (C2)
2. No. 4 Clutch (C4)
3. No. 3 Clutch (C3)
4. No. 1 Clutch (C1)
5. No. 3 Brake (B3)
6. No. 1 Brake (B1)
7. No. 2 Brake (B2)
8. No. 4 Brake (B4)