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Torque Converter | Mercedes | 722.6 & 722.9, 5 Speed, MC-18, MC-19 | MC-18

Mercedes transmissions frequently suffer shudder and cold-stall condition. This is often blamed on the converter, but there is no single cause. The number one cause is using the wrong transmission fluid. Mercedes supplies different (costly) fluids for each type of unit. Trying to reduce costs by substituting with standard fluids will cause the shudder condition and also cause other symptoms.  Leakage of anti-freeze into the transmission via the radiator will also cause the problem. Vehicle manufacturers require triple-flushing of the transmission to assure thorough removal of the antifreeze. This is necessary to assure complete removal of the contaminant.  Many rebuilders always replace the lockup solenoid.  Occasionally, it is required to replace the solenoid block and all the solenoids. The block is made of plastic and can be the cause of the problem. This is the factory approach and it is very costly. Complete factory valve bodies is also a solution.  Frequently the friction plate is wrongfully blamed for causing the shudder.  Experienced rebuilders attribute the condition to internal leaking and they apply leak fixes in different locations within the converter.   Since no one can be certain of the exact cause, it is recommended to apply multiple fixes.    Currently, the most successful correction is the installation of Tri's spring-loaded, spacer steel plate kit, which is intended to deal with shudder & cold-stalling. The concept is to "bypass" the various issues. Major rebuilders successfully install them in all rebuilds.  This is the simplest "drop-in" fix and is very effective and highly recommended. An added benefit is the low cost.  Relevant part numbers are: HX-23-13K, which contains one notched steel plate and ten 0.310“ (7.87mm) long springs and HX-23-15K, which  contains two notched steel plates and ten 0.510“ (12.95mm) long springs. Genuine Tri-component friction plates have long been a proven companion, favorite among rebuilders.

Ill.# Image Description Specification Part #
Snap Ring
  • Thickness: 0.116"
 HX-20-1
Misc NPN-SPL
1 Hubcap Fits 1-5/8" (41.3mm). Length: 1-3/8"
  • Color: Black
  • Fits 1-5/8" (41.3mm)
 MHC-B
2 Impeller Hub Used with "bushing" or "bearing" type pumps
  • Journal Dia: 1.695"
  • Installed Height: 2.008"
  • Hub Mount: Butt
  • Pump Drive Type: Slots
  • Hardness: Rc 32-36
 HH-1-9GRC
2 Impeller Hub Use with bushing-type pump
  • Journal Dia: 1.695"
  • Height: 2.000"
  • Hub Mount: Butt
  • Pump Drive Type: Slots
  • Hardness: Rc 32-36
 HH-1-5GRC
3 Impeller NPN-8-6-3
4 Bearing
  • Thickness: 0.2
  • Thickness metric: 5.08
  • Bearing type: Enclosed
  • Lug Count: 3
  • Outside Dia: 2.587
  • Inside Dia: 1.728
  • Outside Dia Metric: 65.71
  • Inside Dia metric: 43.89
 HW-2-3
4 Friction Plate Carbon 722.6, 272mm. 2 Pieces Required.
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Thickness metric: 2.7mm
  • Segment Count: 72 segments for problem solving O.E. cooling and engagement.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
  • Outside Dia Metric: 176mm
  • Inside Dia metric: 134mm
 HX-23-8CBN
5 Stator NPN-8-6-5
6 Cam NPN-8-6-6
7 Roller Clutch (Sprag)
  • Thickness: 0.531"
  • Inside Dia: 2.362"
  • 14 Rollers (0.314"/ 8mm Dia.). OE# A140 250 0031
 HC-6-1
8 Inner Race
  • Internal Teeth: 38
 NPN-8-6-8
9 Plate 3 Tangs NPN-8-6-9
10 Snap Ring NPN-8-6-10
10 Snap Ring
  • Thickness: 0.104"
 HX-20-2
11 Bearing
  • Thickness: 0.195
  • Thickness metric: 4.95
  • Bearing type: Enclosed
  • Outside Dia: 2.983
  • Inside Dia: 2.167
  • Outside Dia Metric: 75.77
  • Inside Dia metric: 55.04
 HW-2-2
12 Turbine
  • Internal Teeth: 22
 NPN-8-6-12
13 Bearing
  • Thickness: 0.161
  • Thickness metric: 4.06
  • Bearing type: Enclosed
  • Outside Dia: 2.020
  • Inside Dia: 1.311
  • Outside Dia Metric: 51.31
  • Inside Dia metric: 33.27
 HW-2-1
15 Steel Clutch-Plate 2 Pieces Required.
  • Thickness: 0.070"
  • External Teeth: 20
  • Outside Dia: 7.28"
  • Inside Dia: 5.63"
 HX-23-1
15 Steel Clutch-Plate 2 Pieces Required.
  • Thickness: 0.070"
  • External Teeth: 20
  • Inside Dia: 5.63"
  • With notches for springs
 HX-23-13
15 Steel Clutch-Plate 2 Pieces Required.
  • Thickness: 0.080"
  • External Teeth: 20
  • Outside Dia: 7.28"
  • Inside Dia: 5.63"
  • Compensates For Ring Groove Wear
 HX-23-1A
15 Pressure Plate
  • Thickness: 0.142"
  • External Teeth: 20
  • Outside Dia: 7.28"
  • Inside Dia: 5.63"
 HX-23-19
16 Friction Plate High-Carbon 722.6, 290mm. 2 Pieces Required.
  • Thickness: .09"
  • Internal Teeth: 34
  • Segment Count: 72
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23-9HC
16 Friction Plate Kevlar® 722.6, 290mm. 2 Pieces Required.
  • Thickness: .09"
  • Internal Teeth: 34
  • Segment Count: 36 Kevlar® Segments
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23
16 Friction Plate High-Carbon 722.6, 290mm. 2 Pieces Required.
  • Thickness: .09"
  • Internal Teeth: 34
  • Segment Count: 36 Segments, With High-Carbon Linings
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23HC
16 Clutch Plate Kit 722.6, 290mm.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23K
16 Friction Plate Kevlar, 36 Segments, 722.6 722.6, 290mm. 2 Pieces Required.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23KV
16 Friction Plate 722.6, 272mm. 2 Pieces Required.
  • Thickness: .107"
  • Internal Teeth: 34
  • Segment Count: 36
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23-4
16 Friction Plate High-Carbon 2 Pieces Required.
  • Thickness: .107"
  • Internal Teeth: 34
  • Segment Count: 36
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23-4HC
16 Friction Plate Kit 722.6, 272mm. 2 Pieces Required.
  • Thickness: .107"
  • Internal Teeth: 34
  • Segment Count: 36
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23-4K
16 Friction Plate .107, Mercedes
  • Thickness: .107"
  • Internal Teeth: 34
  • Segment Count: 36
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23-4KV
16 Friction Plate 722.6, 272mm. 2 Pieces Required.
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Thickness metric: 2.7mm
  • Segment Count: 72 segments for problem solving O.E. cooling and engagement.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
  • Outside Dia Metric: 176mm
  • Inside Dia metric: 134mm
 HX-23-8
16 Friction Plate High Carbon 722.6, 272mm. 2 Pieces Required.
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Thickness metric: 2.7mm
  • Segment Count: 72 segments for problem solving O.E. cooling and engagement.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
  • Outside Dia Metric: 176mm
  • Inside Dia metric: 134mm
 HX-23-8HC
16 Friction Plate Kit 722.6, 272mm. 2 Pieces Required.
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Thickness metric: 2.7mm
  • Segment Count: 72 segments for problem solving O.E. cooling and engagement.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
  • Outside Dia Metric: 176mm
  • Inside Dia metric: 134mm
 HX-23-8K
16 Friction Plate Kevlar 722.6, 272mm. 2 Pieces Required.
  • Thickness: 0.107"
  • Thickness metric: 2.7mm
  • Segment Count: 72 segments for problem solving O.E. cooling and engagement.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
  • Outside Dia Metric: 176mm
  • Inside Dia metric: 134mm
 HX-23-8KV
16 Friction Plate Tan 2 Pieces Required.
  • Thickness: 0.107"
  • Segment Count: 72 segments for problem solving O.E. cooling and engagement.
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23-8T
16 Friction Plate Kevlar® 722.6, 290mm. 2 Pieces Required.
  • Thickness: .09"
  • Internal Teeth: 34
  • Segment Count: 72
  • Outside Dia: 6.93"
  • Inside Dia: 5.29"
 HX-23-9
17 Pressure Plate 722.6 272mm
  • Thickness: .16"
  • External Teeth: 20
  • Outside Dia: 7.28"
  • Inside Dia: 5.63"
 HX-23-2
17 Steel Clutch-Plate 722.6 & early 722.9 (290mm)
  • Thickness: .197"
  • External Teeth: 20
  • Outside Dia: 7.28"
  • Inside Dia: 5.63"
 HX-23-3
17 Clutch Plate Kit 2 Steels
  • Thickness: 0.070"
  • External Teeth: 20
  • Outside Dia: 7.28"
  • Inside Dia: 5.63"
  • Kit Includes 2 Steel Plates (HX-23-1), Each plate is 0.070" thick.
 HX-23-1K
18 Clutch Plate Kit 272mm
  • Includes: HX-23-1 (2), HX-23-4 (2), HX-23-2 (1)
 HX-23-5K
18 Clutch Plate Kit 290mm
  • Includes: HX-23-1 (2), HX-23 (2), HX-23-3 (1)
 HX-23-6K
18 Clutch Plate Kit High Carbon
  • Includes: HX-23-1 / HX-23-1A (2), HX-23-8HC (2), HX-23-2 (1)
 HX-23-11HCK
18 Clutch Plate Kit 272mm
  • Includes: HX-23-1 / HX-23-1A (2), HX-23-8 (2), HX-23-2 (1)
 HX-23-11K
18 Clutch Plate Kit 290mm
  • Includes: HX-23-1 / HX-23-1A (2), HX-23-9 (2), HX-23-3 (1)
 HX-23-12K
18 Clutch Plate Kit Clutch Release, Anti-Shudder 272mm & 290mm
  • Inside Dia: 5.63"
  • Includes: (1) HX-23-13 (steel) and (10) HX-24-1 Short Springs
 HX-23-13K
18 Clutch Plate Kit With Springs, Anti-Shudder 272mm & 290mm
  • Includes: (2) HX-23-13 (steel) and (10) HX-24-2 Long Springs
 HX-23-15K
18_N.I. Spring Clutch Release 10 Pieces Required. HX-24-1
18_N.I. Spring Clutch Release 10 Pieces Required. HX-24-2
19 D-Ring Seal
  • Height: 0.115
  • Width: 0.083
  • Color: Green
  • Material: Fluorocarbon
  • Height Metric: 2.921
  • Seal Type: D-Ring
  • Inside Dia: 6.528
  • Inside Dia metric: 165.354
 HO-25-1
19 D-Ring Seal Piston Late 722.9, with large piston
  • Height: 0.125
  • Width: 0.08
  • Material: Fluorocarbon
  • Height Metric: 3.175
  • Seal Type: D-Ring
  • Inside Dia: 6.528
  • Inside Dia metric: 165.8112
 HO-25-12
19 D-Ring Seal Mercedes, Black Late 722.9, with large piston
  • Inside Dia: 6.528
 HO-25-1X
20 Piston
  • Internal Teeth: 17
 NPN-8-6-20
20_N.I. D-Ring Seal Late 722.9, with large piston
  • Height: 0.116
  • Width: 0.083
  • Material: Fluorocarbon
  • Height Metric: 2.9464
  • Seal Type: D-Ring
  • Inside Dia: 4.36
  • Inside Dia metric: 110.744
 HO-25-7
21 D-Ring Seal
  • Height: 0.112
  • Width: 0.086
  • Material: Fluorocarbon
  • Height Metric: 2.8448
  • Seal Type: D-Ring
  • Inside Dia: 2.02"
  • Inside Dia metric: 51.2572
 HO-25-2
21 Seal Heavy Duty, Orange
  • Inside Dia: 2.02"
 HO-25-2HD
21.1 Bushing Cover Fits OE front cover. Machining Required
  • Thickness: 0.488"
  • Housing Bore Dia: 0.787
  • Shaft Dia: 0.661
  • Material: Bi-metal
  • Type: Precision
 HB-18
21.2 Tool Pin to install HB-18 Bushing HB-18T
21.3 Kit HX-22-1
21_N.I. Seal Ring Turbine Shaft, Square-Cut
  • Height: 0.112
  • Width: 0.082
  • Material: Fluorocarbon
  • Height Metric: 2.8448
  • Seal Type: Square-Cut
  • Outside Dia: 0.834
  • Outside Dia Metric: 21.1836
 HO-25-3
22 Front Cover Assembly NPN-8-6-22