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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 #
0 Snap Ring
  • Thickness: 0.116"
 HX-20-1
0 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
  • Journal Dia: 1.695"
  • Installed Height: 1.750"
  • Pump Drive Type: 2 Slots
 HH-1-3G
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
2 Impeller Hub Used with "bushing" or "bearing" type pumps
  • Journal Dia: 1.693"
  • Installed Height: 2.008"
  • Hub Mount: Butt
  • Pump Drive Type: Slots
 HH-1-9GRC
3 Impeller NPN-8-6-3
4 Bearing
  • Outer Dia: 2.587
  • Inner Dia: 1.728
  • Thickness: 0.2
  • Outer Dia Metric: 65.71
  • Inner Dia metric: 43.89
  • Thickness metric: 5.08
  • Bearing type: Enclosed
  • 3 Lugs
 HW-2-3
4 Friction Plate Carbon 722.6, 272mm.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Outer Dia Metric: 176mm
  • Inner Dia metric: 134mm
  • Thickness metric: 2.7mm
  • Material: Carbon
  • 72 segments for problem solving O.E. cooling and engagement.
 HX-23-8CBN
5 Stator NPN-8-6-5
6 Cam NPN-8-6-6
7 Roller Clutch (Sprag)
  • Height: 0.531"
  • Inner 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
  • Outer Dia: 2.983
  • Inner Dia: 2.167
  • Thickness: 0.195
  • Outer Dia Metric: 75.77
  • Inner Dia metric: 55.04
  • Thickness metric: 4.95
  • Bearing type: Enclosed
 HW-2-2
12 Turbine
  • Internal Teeth: 22
 NPN-8-6-12
13 Bearing
  • Outer Dia: 2.020
  • Inner Dia: 1.311
  • Thickness: 0.161
  • Outer Dia Metric: 51.31
  • Inner Dia metric: 33.27
  • Thickness metric: 4.06
  • Bearing type: Enclosed
 HW-2-1
15 Clutch Plate Steel 2 Pieces Required.
  • Outer Dia: 7.28"
  • Inner Dia: 5.63"
  • Thickness: 0.070"
  • External teeth: 20
 HX-23-1
15 Clutch Plate Steel 2 Pieces Required.
  • Inner Dia: 5.63"
  • Thickness: 0.070"
  • External teeth: 20
  • With notches for springs
 HX-23-13
15 Clutch Plate Steel 2 Pieces Required.
  • Outer Dia: 7.28"
  • Inner Dia: 5.63"
  • Thickness: 0.080"
  • External teeth: 20
  • Compensates For Ring Groove Wear
 HX-23-1A
15 Pressure Plate
  • Outer Dia: 7.28"
  • Inner Dia: 5.63"
  • Thickness: 0.142"
  • External teeth: 20
 HX-23-19
16 Friction Plate High-Carbon 722.6, 290mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .09"
  • Internal Teeth: 34
  • With 72 Segments
 HX-23-9HC
16 Friction Plate Kevlar® 722.6, 290mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .09"
  • Internal Teeth: 34
  • 36 Segments, With Kevlar® Linings
 HX-23
16 Friction Plate High-Carbon 722.6, 290mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .09"
  • Internal Teeth: 34
  • 36 Segments, With High-Carbon Linings
 HX-23HC
16 Clutch Plate Kit 722.6, 290mm.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
 HX-23K
16 Friction Plate Kevlar, 36 Segments, 722.6 722.6, 290mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
 HX-23KV
16 Friction Plate 2.7mm 722.6, 272mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .107"
  • Internal Teeth: 34
  • With 36 Segments
 HX-23-4
16 Friction Plate High-Carbon
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .107"
  • Internal Teeth: 34
  • With 36 Segments
 HX-23-4HC
16 Friction Plate Kit 722.6, 272mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .107"
  • Internal Teeth: 34
  • With 36 Segments
 HX-23-4K
16 Friction Plate .107, Mercedes
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .107"
  • Internal Teeth: 34
  • With 36 Segments
 HX-23-4KV
16 Friction Plate 722.6, 272mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Outer Dia Metric: 176mm
  • Inner Dia metric: 134mm
  • Thickness metric: 2.7mm
  • 72 segments for problem solving O.E. cooling and engagement.
 HX-23-8
16 Friction Plate High Carbon 722.6, 272mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Outer Dia Metric: 176mm
  • Inner Dia metric: 134mm
  • Thickness metric: 2.7mm
  • Material: High Carbon
  • 72 segments for problem solving O.E. cooling and engagement.
 HX-23-8HC
16 Friction Plate Kit 722.6, 272mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: 0.107"
  • Internal Teeth: 34
  • Outer Dia Metric: 176mm
  • Inner Dia metric: 134mm
  • Thickness metric: 2.7mm
  • 72 segments for problem solving O.E. cooling and engagement.
 HX-23-8K
16 Friction Plate Kevlar, 722.6 722.6, 272mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Outer Dia Metric: 176mm
  • Inner Dia metric: 134mm
  • Thickness metric: 2.7mm
 HX-23-8KV
16 Friction Material Paper 2.7mm, 722.6/9 272mm
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
 HX-23-8T
16 Friction Plate Kevlar® 722.6, 290mm. 2 Pieces Required.
  • Outer Dia: 6.93"
  • Inner Dia: 5.29"
  • Thickness: .09"
  • Internal Teeth: 34
  • With 72 Segments
 HX-23-9
17 Pressure Plate 722.6 272mm
  • Outer Dia: 7.28"
  • Inner Dia: 5.63"
  • Thickness: .16"
  • External teeth: 20
 HX-23-2
17 Clutch Plate Steel 722.6 & early 722.9 (290mm)
  • Outer Dia: 7.28"
  • Inner Dia: 5.63"
  • Thickness: .197"
  • External teeth: 20
 HX-23-3
17 Clutch Plate Kit 2 Steels
  • Outer Dia: 7.28"
  • Inner Dia: 5.63"
  • Thickness: 0.070"
  • External teeth: 20
  • 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
  • Contains: HX-23-1 / HX-23-1A (2), HX-23-8HC (2), HX-23-2 (1)
 HX-23-11HCK
18 Clutch Plate Kit 272mm
  • Contains: HX-23-1 / HX-23-1A (2), HX-23-8 (2), HX-23-2 (1)
 HX-23-11K
18 Clutch Plate Kit 290mm
  • Contains: HX-23-1 / HX-23-1A (2), HX-23-9 (2), HX-23-3 (1)
 HX-23-12K
18 Clutch Plate Kit Clutch Release 272mm & 290mm
  • Inner Dia: 5.63"
  • Contains: (1) HX-23-13 (steel) and (10) HX-24-1 Short Springs
 HX-23-13K
18 Clutch Plate Kit With Springs 272mm & 290mm
  • (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
  • Inner Dia: 6.528
  • Width: 0.083
  • Inner Dia metric: 165.354
  • Color: Green
  • Material: Fluorocarbon
  • Height Metric: 2.921
 HO-25-1
19 D-Ring Seal Piston Late 722.9, with large piston
  • Height: 0.125
  • Inner Dia: 6.528
  • Width: 0.08
  • Inner Dia metric: 165.8112
  • Height Metric: 3.175
 HO-25-12
19 D-Ring Seal Mercedes, Black Late 722.9, with large piston
  • Inner 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
  • Inner Dia: 4.36
  • Width: 0.083
  • Inner Dia metric: 110.744
  • Height Metric: 2.9464
 HO-25-7
21 D-Ring Seal
  • Height: 0.112
  • Inner Dia: 2.02"
  • Width: 0.086
  • Inner Dia metric: 51.2572
  • Height Metric: 2.8448
 HO-25-2
21 Seal Heavy Duty, Orange
  • Inner Dia: 2.02"
 HO-25-2HD
21.1 Bushing Precision, Cover Fits OE front cover. Machining Required
  • Width: 0.488"
  • housing bore dia: 0.787
  • Shaft Dia: 0.661
  • Material: Bi-metalic
 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
  • Outer Dia: 0.834
  • Width: 0.082
  • Outer Dia Metric: 21.1836
  • Material: Fluorocarbon
  • Height Metric: 2.8448
 HO-25-3
22 Front Cover Assembly NPN-8-6-22