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transmissions:722.3 [2020/11/07 08:04] – [Transmission Oil Filter] john5788transmissions:722.3 [2022/11/14 03:29] (current) – [Main Valve Body] john5788
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   * 1981-1989 Mercedes-Benz R107 722.3   * 1981-1989 Mercedes-Benz R107 722.3
   * 1989-1995 Mercedes-Benz R129 722.3   * 1989-1995 Mercedes-Benz R129 722.3
 +
 +===== Troubleshooting =====
 +
 +**Will Not Upshift**
 +  * Check kickdown system. Kickdown valve could be stuck open or the switch located behind the throttle pedal is supplying constant power
 +  * Valve body: Fully disassemble, clean, replace piston seals, and rebuild. Pay extra attention to the 2 screen filters inside the secondary valve body which can be replaced for cheap or simply cleaned out
 +  * Governor is defective
 + 
  
 ===== Transmission Oil ===== ===== Transmission Oil =====
 +Any Dexron II or Dexron III automatic transmission fluid will work
  
 <grid> <grid>
 <col sm="6"> <col sm="6">
-<image shape="responsive">{{ transmissions:722.3atfcapacity.png }}</image>+  * Mobil 1 Synthetic ATF 
 +</col> 
 +<col sm="1">
 </col> </col>
 <col sm="3"> <col sm="3">
Line 29: Line 40:
 <panel-body> <panel-body>
 <image shape="responsive">{{ transmissions:mobil1syntheticatf.jpg?200 }}</image> <image shape="responsive">{{ transmissions:mobil1syntheticatf.jpg?200 }}</image>
-A popular choice for fluid is [[https://mobiloil.com/en/automatic-transmission-fluid/synthetic-atf|Mobil 1 Synthetic ATF]]+A popular choice for fluid is [[https://amzn.to/3gryhFb|Mobil 1 Synthetic ATF]]
 </panel-body> </panel-body>
 </panel> </panel>
 </col> </col>
 </grid> </grid>
 +
 +<image shape="responsive">{{ transmissions:722.3atfcapacity.png }}</image>
  
 ==== Drain ==== ==== Drain ====
Line 65: Line 78:
  
 ===== Transmission Oil Filter ===== ===== Transmission Oil Filter =====
 +//See also:// [[parts:1262770295 | Oil Filter (126 277 02 95)]]
 <grid> <grid>
 <col sm="6"> <col sm="6">
Line 79: Line 93:
 <col sm="4"> <col sm="4">
 <thumbnail> <thumbnail>
-{{gallery>:transmissions:7223transmissionfilter.jpg?300&lightbox }}+{{ transmissions:7223transmissionfilter.jpg?300 }}
 <caption>Transmission filter located inside 722.3 transmission </caption> <caption>Transmission filter located inside 722.3 transmission </caption>
 </thumbnail> </thumbnail>
Line 195: Line 209:
 </grid> </grid>
  
-===== K1/K2 Spring ===== 
-<grid> 
-<col sm="3"> 
  
-<panel type="default" title="Valve body springs" no-body="true"> 
-^ Part number ^ Description ^ 
-| 126 270 44 77 | K1 Spring Kit | 
-| 126 270 05 35 \\ 126 270 04 35 | K2 Spring Kit | 
-</panel> 
  
-</col> 
-</grid> 
  
-==== K1 Spring ==== 
-The K1 spring kit can be purchased and used to replace an existing part to help alleviate shift flares between gears 2 and 3. The part number **126 270 44 77** can be used at a Mercedes-Benz dealer for ordering a replacement kit.  
- 
-=== Procedure === 
- 
-  - Drain transmission fluid 
-  - Remove transmission oil pan 
-  - Locate K1 spring cover on valve body towards front of transmission 
-  - Loosen the bottom left or right flat-head screw and remove the other 3 
-  - Rotate cover and remove spring and bore 
-  - Assemble new K1 spring into existing bore 
-    - Place smallest diameter spring over white plastic thrust pin 
-    - Place plastic thrust pin assembly inside one end of the largest coil spring 
-    - Place black cap on the other end of the largest coil spring 
-    - Compress the springs together until white thrust pin is inserted into black cap 
-    - Short large coil spring goes on top of black cap 
-  - Insert K1 spring and close cover 
- 
-==== K2 Spring ==== 
-The K2 spring kit can be purchased and used to replace an existing part to help alleviate shift flares between gears 3 and 4. The part number **126 270 05 35** or **126 270 04 35** can be used at a Mercedes-Benz dealer for ordering a replacement kit. It is unclear what the differences between the two spring kits are (aside from different piston colors), but there are unconfirmed claims that the part number **126 270 05 35** is a stiffer spring. This kit comes with a new piston and seal. 
-\\ 
-In the EPC, these parts are listed for a 722.4 transmission, but they seem to be functional for 722.3 transmissions.  
- 
-=== Procedure === 
- 
-<grid> 
-<col sm="6"> 
-  - Drain transmission fluid 
-  - Remove transmission oil pan 
-  - Remove transmission filter 
-  - Locate K2 spring cover on valve body towards rear of transmission 
-  - Loosen the bottom left or right flat-head screw and remove the other 3 
-  - Rotate cover and remove spring and bore 
-  - Insert new K2 spring and bore 
-  - Close cover 
-</col> 
-<col sm="3"> 
-<thumbnail> 
-{{ transmissions:k2oldandnew.jpg?300 }} 
-<caption>Old K2 spring and new K2 spring side by side</caption> 
-</thumbnail> 
-</col> 
-<col sm="3"> 
-<thumbnail> 
-{{ transmissions:k2springlocation.jpg?300 }} 
-<caption>K2 spring cover located towards the rear of the transmission </caption> 
-</thumbnail> 
-</col> 
- 
-</grid> 
  
 ===== B2 Piston ===== ===== B2 Piston =====
Line 366: Line 320:
 | 005 997 70 48 | Large B2 cover seal ring | | 005 997 70 48 | Large B2 cover seal ring |
 | [[parts:1262770850|126 277 08 50]] | White plastic guide bushing | | [[parts:1262770850|126 277 08 50]] | White plastic guide bushing |
-| 006 997 73 47 | Small B2 piston lip seal |+| [[parts:0069977347|006 997 73 47]] | Small B2 piston lip seal |
 </panel> </panel>
 </col> </col>
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 === Procedure === === Procedure ===
   - Remove B2 piston   - Remove B2 piston
-  - Remove valve body lower cover and intermediate plate+  - [[ transmissions:722.3#valve_body | Remove valve body lower cover and intermediate plate]]
   - Assemble puller and use to remove guide bushing and lip seal at same time   - Assemble puller and use to remove guide bushing and lip seal at same time
     - Check that there is even force applied across the entire surface of the guide bushing when pulling.     - Check that there is even force applied across the entire surface of the guide bushing when pulling.
Line 486: Line 440:
   - Drain transmission oil   - Drain transmission oil
   - Remove transmission oil pan   - Remove transmission oil pan
-  - Remove transmission filter+  - [[ transmissions:722.3#transmission_oil_filter | Remove transmission filter]]
  
-==== Shift Valve Housing ====+==== Main Valve Body ====
 <image shape="responsive">{{ transmissions:7223shiftvalvehousingdiagram.png }}</image> <image shape="responsive">{{ transmissions:7223shiftvalvehousingdiagram.png }}</image>
  
 === Removal === === Removal ===
- 
  
 <grid> <grid>
 <col sm="6"> <col sm="6">
-  - Remove 3x 13mm/M6x50 hex bolts located on the right side of the shift valve housing. These may be colored differently than the others. +  - Remove 3x 10mm/M6x50 hex bolts located on the right side of the shift valve housing. These may be colored differently than the others. 
-  - Remove 12x 13mm/M6x55 hex bolts+  - Remove 12x 10mm/M6x55 hex bolts
   - Pull shift valve housing away from transmission and do not flip over.   - Pull shift valve housing away from transmission and do not flip over.
 </col> </col>
Line 503: Line 456:
 <thumbnail> <thumbnail>
 {{ transmissions:7223shiftvalve.jpg?300 }} {{ transmissions:7223shiftvalve.jpg?300 }}
-<caption>Shift valve housing mounted to intermediate plate</caption>+<caption>Main valve body mounted to intermediate plate</caption>
 </thumbnail> </thumbnail>
 </col> </col>
Line 509: Line 462:
 <thumbnail> <thumbnail>
 {{ transmissions:7223shiftvalvebodyremoved.jpg?300 }} {{ transmissions:7223shiftvalvebodyremoved.jpg?300 }}
-<caption>Shift valve housing removed on the bench </caption>+<caption>Main valve body removed on the bench</caption>
 </thumbnail> </thumbnail>
 +</col>
 +</grid>
 +
 +=== Disassembly ===
 +
 +
 +
 +=== Reassembly ===
 +
 +<grid>
 +<col sm="6">
 +
 +</col>
 +<col sm="6">
 +<grid>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:7223_upper_valve_body_check_balls.jpg?300 }}
 +<caption>Upper valve body check balls</caption>
 +</thumbnail>
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:7223_upper_valve_body_springs_valves.jpg?300 }}
 +<caption>Upper valve body springs and valves</caption>
 +</thumbnail>
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:7223_lower_valve_body_valves.jpg?300 }}
 +<caption>Lower valve body valves</caption>
 +</thumbnail>
 +</col>
 +</grid>
 </col> </col>
 </grid> </grid>
Line 517: Line 504:
 === Installation === === Installation ===
  
-==== Lower Cover and Intermediate Plate ====+==== Secondary Valve Body ====
 <image shape="responsive">{{ transmissions:7223lowercoverdiagram.png }}</image> <image shape="responsive">{{ transmissions:7223lowercoverdiagram.png }}</image>
  
Line 525: Line 512:
 <col sm="8"> <col sm="8">
  
-<panel type="default" title="Lower cover parts" no-body="true">+<panel type="default" title="Secondary Valve Body Parts" no-body="true">
 ^ Part number ^ Description ^ ^ Part number ^ Description ^
 | 126 277 14 80 | Intermediate plate gasket  | | 126 277 14 80 | Intermediate plate gasket  |
-| 124 277 02 80 | Lower cover gasket, retrofittedOlder cars may not have this part from factory install.  |+| 124 277 02 80 | Secondary valve body gasket. Not required on some valve bodies | 
 +| 140 270 02 98 | Filter screens, 2x  |
 </panel> </panel>
  
Line 538: Line 526:
 <grid> <grid>
 <col sm="6"> <col sm="6">
-  - Remove shift valve housing+  - Remove main valve body housing
   - Remove bracket and detent leaf spring, 1x 10mm hex bolt   - Remove bracket and detent leaf spring, 1x 10mm hex bolt
   - Remove bolts securing lower cover to transmission case, 9x 10mm hex bolts   - Remove bolts securing lower cover to transmission case, 9x 10mm hex bolts
-  - Pull lower cover along with large intermediate plate away from transmission+  - Pull secondary valve body along with large intermediate plate away from transmission
   - Oil deflector piece may fall out from front side of transmission after intermediate plate is removed   - Oil deflector piece may fall out from front side of transmission after intermediate plate is removed
 </col> </col>
Line 548: Line 536:
 <thumbnail> <thumbnail>
 {{ transmissions:7223lowercoverintermediateplate.jpg?300 }} {{ transmissions:7223lowercoverintermediateplate.jpg?300 }}
-<caption>Lower cover and intermediate plate</caption>+<caption>Secondary valve body and intermediate plate</caption>
 </thumbnail> </thumbnail>
 </col> </col>
Line 554: Line 542:
  
  
-=== Gasket Replacement === +=== Disassembly and Cleaning ===
- +
  
 <grid> <grid>
 <col sm="6"> <col sm="6">
-  - Remove lower cover reinforcement plate, 4x flat-head screws+  - Remove small backing plate, 4x flat-head screws
   - Discard and clean up any old gasket pieces   - Discard and clean up any old gasket pieces
-  - Align lower cover gasket +  - Remove 2 filter screens 
-    - Older transmissions may not have this piece installed from factory. This was retrofitted sometime later. +  - Remove reverse lockout piston 
-  - Align intermediate plate and gasket +    - Push in the plunger and remove the E-clip 
-  - Install lower cover reinforcement plate+  - Clean parts 
 +  - Reassemble with new gaskets 
 </col> </col>
 <col sm="6"> <col sm="6">
Line 572: Line 560:
 <thumbnail> <thumbnail>
 {{ transmissions:7223lowercover.jpg?300 }} {{ transmissions:7223lowercover.jpg?300 }}
-<caption>Lower cover</caption>+<caption>Secondary Valve Body</caption>
 </thumbnail> </thumbnail>
 </col> </col>
Line 578: Line 566:
 <thumbnail> <thumbnail>
 {{ transmissions:7223lowercovergasketaligned.jpg?300 }} {{ transmissions:7223lowercovergasketaligned.jpg?300 }}
-<caption>Lower cover gasket aligned</caption>+<caption>Secondary valve body gasket aligned</caption>
 </thumbnail> </thumbnail>
 </col> </col>
Line 585: Line 573:
 {{ transmissions:7223intermediateplateandgasketinstalled.jpg?300 }} {{ transmissions:7223intermediateplateandgasketinstalled.jpg?300 }}
 <caption>Intermediate plate and gasket installed</caption> <caption>Intermediate plate and gasket installed</caption>
 +</thumbnail>
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:7223_reverse_lockout.jpg?300 }}
 +<caption>Removing reverse lockout plunger</caption>
 </thumbnail> </thumbnail>
 </col> </col>
Line 592: Line 586:
  
 === Installation === === Installation ===
- 
- 
- 
  
 <grid> <grid>
Line 600: Line 591:
   - Clean transmission case of any pieces of the old gasket   - Clean transmission case of any pieces of the old gasket
   - Install oil deflector if it was removed   - Install oil deflector if it was removed
-  - Mount lower cover with intermediate plate against transmission case while aligning oil pipe +  - Mount secondary valve body with intermediate plate against transmission case while aligning oil pipe 
-  - Secure bolts holding lower cover to transmission case, 9x 10mm hex bolts+  - Secure bolts holding lower cover to transmission case, 9x 10mm hex bolts, torque to 8 Nm
   - Mount detent leaf spring and bracket   - Mount detent leaf spring and bracket
 </col> </col>
Line 612: Line 603:
 </col> </col>
 </grid> </grid>
 +
 +=== Screen filters ===
 +Some valve bodies are equipped with 2 small screen filters which can become clogged and cause shifting problems. 
 +
 +<grid>
 +<col sm="6">
 +<thumbnail>
 +{{ parts:1402700298.jpg?500 }}
 +<caption>140 270 02 98 - Screen filters</caption>
 +</thumbnail>
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:7223_valvebody_cloggedfilters.jpg?500 }}
 +<caption>Clogged screen filters</caption>
 +</thumbnail>
 +</col>
 +</grid>
 +
 +
 +==== K1 / K2 Accumulators ====
 +
 +The K1 and K2 accumulators are located inside of the lower valve body behind covers which are easily accessible with the transmission pan removed.
 +
 +\\
 +
 +<grid>
 +<col sm="6">
 +
 +<panel type="default" title="Valve body springs" no-body="true">
 +^ Part number ^ Description ^
 +| 126 270 03 35 | K1 Accumulator Kit, spring and piston |
 +| 126 270 44 77 | K1 Spring Kit, springs only, stiffer spring |
 +| 126 270 04 35 | K2 Accumulator Kit, springs and piston, 21.60mm piston |
 +| 126 270 05 35 | K2 Accumulator Kit, springs and piston, 19.80mm piston |
 +</panel>
 +
 +</col>
 +</grid>
 +
 +=== K1 Accumulator ===
 +
 +The K1 accumulator is in charge of shifts between 2 and 3. Usually to help with shifting problems, the springs can be replaced with stiffer ones that are ordered from a Mercedes-Benz dealer. 
 +
 +Part number **126 270 44 77** provides only the stiffer replacement springs which mean you will need to reuse the old piston and seals. Part number **126 270 03 35** will provide a new K1 accumulator piston, seals, as well as the original springs. It is recommended to order both kits and replace the springs from **126 270 03 35** with the stiffer springs from **126 270 44 77** for reinstalling into the valve body.
 +
 +\\
 +
 +<grid>
 +<col sm="6">
 +<thumbnail>
 +{{ parts:1262700335.jpg?500 }}
 +<caption>126 270 03 35 - K1 Accumulator Kit</caption>
 +</thumbnail>
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ parts:1262704477.jpg?500 }}
 +<caption>126 270 44 77 - Stiffer replacement K1 springs</caption>
 +</thumbnail>
 +</col>
 +</grid>
 +
 +== Procedure ==
 +<grid>
 +<col sm="6">
 +  - Drain transmission fluid
 +  - Remove transmission oil pan
 +  - Locate K1 spring cover on valve body towards front of transmission
 +  - Loosen the bottom left or right flat-head screw and remove the other 3
 +  - Rotate cover and remove spring and bore
 +  - Assemble new K1 spring into existing bore
 +    - Place smallest diameter spring over white plastic thrust pin
 +    - Place plastic thrust pin assembly inside one end of the largest coil spring
 +    - Place black cap on the other end of the largest coil spring
 +    - Compress the springs together until white thrust pin is inserted into black cap
 +    - Short large coil spring goes on top of black cap
 +  - Insert K1 spring and close cover
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:7223_k1springlocation.jpg?300 }}
 +<caption>K1 Spring located in valve body</caption>
 +</thumbnail>
 +</col>
 +</grid>
 +
 +=== K2 Accumulator ===
 +
 +The K2 spring kit can be purchased and used to replace an existing part to help alleviate shift flares between gears 3 and 4. The part number **126 270 04 35** or **126 270 05 35** can be used at a Mercedes-Benz dealer for ordering a replacement kit. **126 270 04 35** has a 21.6 mm piston lip diameter and **126 270 05 35** has a 19.8 mm piston lip diameter. Be sure to order the matching piston size for your valve body.
 +
 +\\
 +In the EPC, these parts are listed for a 722.4 transmission, but they seem to be functional for 722.3 transmissions. 
 +
 +== Procedure ==
 +<grid>
 +<col sm="6">
 +  - Drain transmission fluid
 +  - Remove transmission oil pan
 +  - [[ transmissions:722.3#transmission_oil_filter | Remove transmission filter ]]
 +  - Locate K2 spring cover on valve body towards rear of transmission
 +  - Loosen the bottom left or right flat-head screw and remove the other 3
 +  - Rotate cover and remove spring and bore
 +  - Insert new K2 spring and bore
 +  - Close cover
 +</col>
 +<col sm="6">
 +<grid>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:k2oldandnew.jpg?300 }}
 +<caption>Old K2 spring and new K2 spring side by side</caption>
 +</thumbnail>
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ transmissions:k2springlocation.jpg?300 }}
 +<caption>K2 spring cover located towards the rear of the transmission </caption>
 +</thumbnail>
 +</col>
 +<col sm="6">
 +<thumbnail>
 +{{ parts:1262700435.jpg?300 }}
 +<caption>Blue K2 Piston, 21.6mm diameter </caption>
 +</thumbnail>
 +</col>
 +</grid>
 +</col>
 +</grid>
 +
 +=== B1 Accumulator ===
 +
 +===== Kickdown Solenoid =====
 +
 +The kickdown solenoid is located on the right rear of the transmission and is secured by a single 19mm hex bolt. A wire attached to the kickdown solenoid receives signal from the kickdown switch located behind the throttle pedal. If working with jack stands, it is beneficial to lift the rear of the car higher than the front to minimize the amount of fluid lost when the solenoid valve is removed.
 +
 +\\
 +
 +<grid>
 +<col sm="6">
 +<panel type="default" title="Kickdown Solenoid Seals" no-body="true">
 +^ Part number ^ Description ^
 +| 115 304 01 60 | Aluminum crush washer  |
 +| 001 997 35 48 | Smallest o-ring at top of valve |
 +| 008 997 30 48 | Thicker medium sized o-ring in middle of valve |
 +| 001 997 31 48 | Thin largest diameter o-ring at hex head |
 +</panel>
 +</col>
 +<col sm="1"></col>
 +<col sm="4">
 +<thumbnail>
 +{{ transmissions:722_3_kickdown_valve_parts.jpg?300 }}
 +<caption>Kickdown solenoid valve parts</caption>
 +</thumbnail>
 +</col>
 +</grid>
 +
 +=== Removal ===
 +
 +<grid>
 +<col sm="6">
 +  - Remove transmission mount
 +  - Remove transmission exhaust hanger
 +  - Unplug kickdown switch wire
 +  - Unscrew 19mm hex bolt
 +  - Remove solenoid valve
 +  - Press valve out of solenoid body
 +</col>
 +<col sm="1"></col>
 +<col sm="4">
 +<thumbnail>
 +{{ transmissions:722_3_kickdown_solenoid_removed.jpg?300 }}
 +<caption>Kickdown solenoid removed</caption>
 +</thumbnail>
 +</col>
 +</grid>
 +
 +=== Testing ===
 +
 +Apply 12V across the control pin and body ground of the solenoid. The needle valve should retract and make a clicking sound. The resistance of the solenoid should be fairly low around 10 ohms.
 +
 +<image shape="responsive">{{ transmissions:kickdown_solenoid_ohm_test.jpg }}</image>
 +
 +=== Install ===
 +  - Replace seals, lubricate with ATF so they are not dry installed
 +  - Reverse of removal
  • transmissions/722.3.1604736270.txt.gz
  • Last modified: 2020/11/07 08:04
  • by john5788