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Author Topic: Peerless MST 200 Series Transaxle Specs  (Read 2505 times)
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« on: October 01, 2012, 08:57:56 PM »

Peerless  MST-200 Series  Transaxles

   The information in this post is applicable to all Peerless aluminum-case manual-inline-shift gear-drive transaxles that have Ύ”-diameter axles and Model Numbers that start with MST-20x, such as MST 206-545C, a popular Sears/Craftsman/Husqvarna/Poulan 6-speed transaxle.
   These transaxles have lip-style oil seals on the axle, brake and input shafts; an O-ring seal on the shift shaft; and they use 80W-90 petroleum-base gear oil for lubricant.
 
Axles

Left Side                                                       Right Side
Length – Part Number                           Length – Part Number


  9-15/32” (9.464” / 24.0 cm) – 775042     14-3/64” (14.046” / 35.7 cm) – 775041
10-17/32” (10.531” / 26.8 cm) – 774981    15-5/32” (15.156” / 38.5 cm) – 774982
11.0” (27.9 cm) – 774888                        15-9/16” (15.562” / 39.5 cm) – 774909
11-1/16” (11.062 / 28.1 cm) – 774999       15-5/8” (15.625” / 39.7 cm) – 774689
11-1/4” (11.25” / 28.6 cm) – 775047         15-13/16” (15.812” / 40.2 cm) – 775048
11-5/16” (11.312” / 28.7 cm) – 774686      15-7/8” (15.875” / 40.3 cm) – 774687
11-3/8” (11.375” / 28.9 cm) – 775000       16-5/32” (16.156” / 41.0 cm) – 775054
11-5/8” (11.625” / 29.5 cm) – 774688       16-1/4” (16.25” / 41.3 cm) – 774747
11-3/4” (11.75” / 29.8 cm) – 774974         16-5/16” (16.312” / 41.4 cm) – 774926
11-13/16” (11.812” / 30.0 cm) – 774697    16-7/16” (16.437” / 41.7 cm) – 774738
11-63/64” (11.984” / 30.4 cm) – 775028    16-1/2” (16.5” / 41.9 cm) – 774691
12-7/32” (12.218” / 31.0 cm) – 774942      16-9/16” (16.562” / 42.1 cm) – 775027
12-3/8” (12.375” / 31.4 cm) – 774638        16-3/4” (16.75” / 42.5 cm) – 774930
12-7/16” (12.437” / 31.6 cm) – 774943      16-13/16” (16.812” / 42.7 cm) – 774869
12-1/2” (12.5” / 31.8 cm) – 775006           17.0” (43.2 cm) – 774837
13.0” (33.0 cm) – 774772                         17-1/32” (17.031” / 43.3 cm) – 774944
13-13/16” (13.812” / 35.1 cm) – 775102     17-5/8” (17.625” / 44.8 cm) – 775001
14-3/8” (14.375” / 36.5 cm) – 774891        18-1/8” (18.125” / 46.0 cm) – 775007
16-7/16” (16.437” / 41.7 cm) – 774738       18-3/8” (18.375” / 46.7 cm) – 775101

NOTES: 
1. These axles are the ones with 3/16” straight keyways and snap-ring grooves that hold the wheels on.  There are a few other axles that have pinned or threaded ends; they are not included in this list.
2. Axles are interchangeable left-to-right, provided they extend far enough past the housing to be useful. 
  a. The transaxle housing covers 7-1/4” of the left axle and 11-3/4” of the right axle. 
  b. Using the first (shortest) axle in each column as an example, the 775042 left axle will have 2-7/32” of axle exposed; the 775041 right axle will have 2-19/64” exposed. 
  c. Likewise, using the last (longest) axles, the 774738 left axle will have 9-3/16” exposed; the 775101 right axle will have 6-5/8” exposed.


Gears & Gear Ratios

   The gear ratios and respective Part Numbers and gear material for the Peerless MST 200-Series transaxle gears are as follows:

Input Pinion Bevel Gear Ratio — 2.31:1 (13T:30T – 778309p:778334p)

Final Drive Ratio — 9.89:1
   [Output Ratio – 3.45:1 (11T:38T – 778330s:778331p) x  Differential-Gear Ratio –  2.87:1  (15T:43T – *:778370p)]

Possible Low-to-High Ratios:
4.00:1  (10T:40T – “z”:778357s)
3.00:1  (10T:30T – 778335p:778336p)
2.64:1  (11T:29T – 778355s:778356s)
2.07:1  (13T:27T – 778337p:778338p)
1.50:1  (16T:24T – 778339p:778340p)
1.30:1  (17T:23T – 778353s:778354s)
1.225:1  (18T:22T – 778341p:778342p)
1.00:1  (20T:20T – 778343p:778344p)
0.90:1  (21T:19T – 778351s:778346p or 778351s:778352s)
0.67:1  (24T:16T – 778349p:778350s)
0.60:1  (25T:15T – 778345p:778346s)

Reverse — 2.08:1  (13:27 – 778333p:778338p [‘A’-Input] or 778363p:778338p [‘B’-Input])

NOTES:
1.  With the exception of the “granny-low” 1st gear ratio of 4.00:1, the number of teeth on both the driver and driven gear always totals 40 for these MST 200 transaxles.
2.  Powdered Metal gears will be noted by a “p” suffix following the gear part number; Heat-treated Steel gears will have an “s” suffix.  The suffixes ARE NOT part of the Part Number.
* 3. Three different 15T Differential Drive Gears are used, depending on transaxle model — 778332, 778365 or 778369.  All three 15T gears are Steel.
z 4.  The 10T Countershaft gear for the 4.00:1 “granny-low” ratio is steel and is made as part of the countershaft.  The ‘A’-Input Countershaft w/Gear is P/N 776400; the ‘B’-Input Countershaft w/Gear is P/N 776404.
5.  The Reverse-drive spur gear includes (is made a part of) the Reverse-drive bevel gear, with the bevel gear having the same 30T as the Forward-drive bevel gear.

Respectfully; Rodney Rom; Rom's Reworks; Butler, MO
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