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Mercedes-Benz Technical Service Information 722.3 and 722.4.pdf

October 7, 2008 · Filed Under Auto Parts & 3rd Parties  · Tags: ,

Taken from intro: Mercedes introduced the 722 models in 1980. The 722.3 is found in most models and the 722.4 was first found in the 190 vehicles. This manual covers the difference between these units in the valve body and governor. The basic components , the pump, gear sets, drums, clutches, bands are the same. This manual covers both the original manufacturers information along with some of the changes and updates. We thank Mercedes Benz for the information and illustrations that have made this booklet possible.

Contents:

  • Application and cross section
  • Test connection
    For testing the pressure values which are important for operation and diagnosis, the transmission has three test connections. The test connection can be used to test the modulating pressure.
  • Road Test
  • Valve Body Removal
  • Valve Body Teardown
  • Valve Body 722.4
  • Removal Rear Pump and Governor
  • Governor 722.3 / 722.4
  • Transmission Removal and Replace
  • Teardown of transmission
  • Teardown front pump
  • Tear down planetary components
  • K1 Clutch
  • K2 Clutch
  • Trouble Shooting
  • Technical Bulletins and updates
    • MODULATOR BRACKETS 722.3 and 722.4
      There are two size modulator retaining plates. They are illustrated and the groove in the modulator where that fit. A plate fits in the larger groove and the. B plate fits in the smaller groove.
    • MERCEDES 722.3 1986-UP TV PLUNGER ASSEMBLY
      The TV valve line-up is different in the Mercedes models 420 SEL, 560 SEL and SL models. This change was made the the 1986 model year. Figure 1 illustrates the valve line-up.
    • Mercedes 722.3 and 722.4 1980 to 1991 Delay engagement, in all Forward positions.
      The B2 piston seal has been replaced with the late type. Part # 107 270 04 32 that is the “T” type teflon seal. The “T” type seal is not flexible and does not seal well against the servo bore wall.
    • Technical Service Information Mercedes 722.3 Early Version 1980-84 (6 bolt pan)
      The threaded hole in the pump body for the use of a pump puller was originally drilled through the pump support up thru 1984. When installing the pump puller the threads in the pump support are pushed above the surface of the support causing a cross leak with the B3 or reverse clutch apply hole. The (fluid leaks past the gasket and comes out the hole that the puller was installed in. The..later models DO NOT have the hole drilled completely through the pump support.
    • MERCEDES 722.4 HARSH REVERSE AFTER REBUILD CHECK VALVE IN PUMP OK
      The reverse feed passage is unrestricted, allowing too much oil volume to the reverse clutches.
    • MERCEDES ALL MODELS HARSH ENGAGEMENT IN REVERSE AND DRIVE
    • MERCEDES 722.3 / 722.4 SEPARATOR PLATE IDENTIFICATION
      Illustrated is the separator plate ID in Figure 1 for both the regular 722.3 valve body and the 722.4 which is the 190E plate. You will note that the ” regular” six bolt pan plate has a large opening where as the 190E opening is split. The arrows point to the locations on the plate. The regular plate (722.3) has a late and early version. The early will NOT fit the late valve body but the late will fit the early. Note the difference. The late has a square hole instead of the two orifices in the early. This is the position of the valve body screen.
    • MODIFIED BRAKE BAND PISTON B1 WITH PRESSURE PIN
      As of April 1986 production the above mentioned transmissions are equipped with a modified brake band piston B1 with removeable pressure pin (previously caulked). The pressure pin (38) is held in place in the piston by an 0-ring 1.0 mm and 1.5mm thicknesses ( Figure 5).
    • MERCEDES 722.4 BURNT FLUID
      The bellville washer of the K-1 clutch rubs against the planetary-gear carrier of the front planetary.
    • MERCEDES 722.3 MODELS 107 123 126 COMPENSATING PIN FOR THE MODULATOR VALVE
      IN EARLY 1981 PRODUCTION A PLASTIC COMPENSATING PIN WAS INSTALLED IN THE VACUUM MODULATOR AND THE CONTROL PRESSURE SLIDE VALVE (MODULATOR VALVE). THE COMPENSATING PIN ALLOWS FOR THE EXPANSION OF THE MODULATOR VALVE INORDER TO PREVENT VARIATION OF THE MODULATING PRESSURE DUE TO THE VARYING TEMPERATURE OF THE TRANSMISSION. THIS IS DESIGNED TO IMPROVE THE SHIFT CHARACTERISTICS OF THE TRANSMISSION DURING START-UP AND BEFORE THE TRANSMISSIONS GETS TO OPERATING TEMPERATURE.
    • MERCEDES 722.3 / 722.4 LOWER VALVE BODY UPDATE
      There are three versions of the K2 shift valve line-up in the lower valve body. we have illustrated these in the illustration below. Line-up “A” is the second and most common version. The “C” line-up is the first version. The “B” line-up was first found in the 722.4 and became the third version in the late model 722.3.

This service bulletin is available FREE at European Transmissions website, we merely collect the information, we are neither affiliated with the author(s), the website and Mercedes-Benz brand nor responsible for its content and change of content. (Read our disclaimer here or here before you download the document from the website written above by clicking the below link).

Download free Mercedes-Benz Technical Service Information 722.3 and 722.4.pdf (120 pages pdf file, 4.8 MB).

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