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Symptoms:
  • Burnt brake clutches
  • Burnt clutches
  • Delayed Reverse with harsh engagement
  • Flare shifts
  • Forward slip
  • Harsh Reverse
  • Harsh shifts
Cause:

Wear at the accumulator piston bores in the valve body or on the critical diameters of the accumulator pistons allows apply oil to exhaust.

Correction:

The Sonnax hardcoat anodized accumulator piston incorporates an O-ring for positive sealing and annular grooves for better centering and wear prevention.

U660E, U660F, U760E, U760F

B1, B2, B3, C2 Accumulator Piston Kit

Part No.

47740-11K

B1, B2, B3, C2 Accumulator Piston Kit
  • 47740-11k_combo

  • B1, B2, B3, C2 Accumulator Piston Kit

  • 47740-11k_details

Small_47740-11k_combo Small_47740-11k Small_47740-11k_details

U660E, U660F, U760E, U760F

B1, B2, B3, C2 Accumulator Piston Kit

Part No. 47740-11K

  • Piston
  • O-Rings (2) 1 extra

Complaint:

  • Burnt brake clutches
  • Burnt clutches
  • Delayed Reverse with harsh engagement
  • Flare shifts
  • Forward slip
  • Harsh Reverse
  • Harsh shifts

Cause:

Wear at the accumulator piston bores in the valve body or on the critical diameters of the accumulator pistons allows apply oil to exhaust.


Correction:

The Sonnax hardcoat anodized accumulator piston incorporates an O-ring for positive sealing and annular grooves for better centering and wear prevention.

Wear at the accumulator bores or on the critical diameters of the accumulator pistons in the Toyota/Lexus U660E/F, U760F/F transmission is very common. The B1, B2, B3 and C2 accumulator pistons are all the same size and are used during apply of the clutches and brakes to ease the engagement of the apply component. Wear at the valve body bore allows clutch/brake apply oil to exhaust, resulting in harsh or delayed apply of the clutch or brake, burned clutches and brakes, or slipping and flares in the associated gears.

Sonnax B1, B2, B3, C2 accumulator piston kit 47740-11K incorporates an O-ring for positive sealing, even in worn bores. This one kit will work in any of the four bores.

  • No machining or special tools required
  • O-ring provides positive seal even in worn bores
  • Annular grooves provide better piston centering and reduce wear
NOTE:

Fits in any of four locations.

Related Parts

You need this if...

A vacuum test at the port indicated fails to hold at least 18 in-Hg, or if visual wear in bore or on the accumulator piston is detected.

  • Test Locations

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Valve Body Layouts

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Valve Body Layout Toyota U660E/F, U760E/F

Related Tech Articles

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