Ford 9N Service Manual page 79

Q: "What is a Sherman transmission?"
A: A Sherman transmission is an auxilliary gearbox that mounts in the cavity in front
of the transmission. They increase or decrease the speed of the input shaft to the
transmission to provide the tractor a whole other range of speeds. They were available
as a dealer installed option and came in overdrive, underdrive, and dual over/under
configurations.
The basic Sherman overdrive has a shift lever on the left front side of the
transmission case. This shifter is about a foot long with a small bend about 1/3 of
the way up and is made from 1/2" rod. It points upward and has an aluminum knob on
the end. Some Sherman overdrives were installed with a cable assembly to shift them.
This heavy cable comes out of the top right front of the transmission case and goes
to the lower right side of the dash panel where it ends with a black plastic knob.
Push the knob in for overdrive.
The Sherman over/underdrive transmission also has the shift lever on the left front
side of the transmission case. The lever attaches with an allen head cap screw and
runs horizontal with the case then makes an abrupt bend and sweeps back and up to
a small cast knob on the end. To view original Sherman literature and specs for the
over/underdrive combination transmission, (click here page 1) (click here page 2)
To view Sherman "step up" transmission literature, (click here)
Another not so common auxilliary transmission was made by the Hupp Company. The
shift levers for the Hupp units were on the right front side of the transmission
case and extend rearward. Like Shermans, they were also available in overdrive,
underdrive, and over/underdrive configurations. To view original Hupp sales
literature (courtesy of Ed Gooding) (click here page 1) (click here page 2)
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SHERMAN COMBINATION TRANSMISSION
STEP_UP
(Sherman Products, Inc. Numbers)
Ref No. Ford No. Source No.
.
1 5190035 10A134
2 5190027 B115A3
3 5190063 10A701
Assy 10A710
4 5190066 10A705
Assy 5190089 10A730
5 5190062 10A157
6 5190044 10A177
7 5190077 10A717
8 5190080 10A721
9 5190085 10A726
10 5190093 10A737
11 5190068 10A707
12 5190094 10A754
13 5190046 10A741
Shermanparts.txt
STEP-DOWN
MODELS 519-3 AND 519-155
(Ford Model Numbers?)
or
MODELS 10A700B AND #1201
PARTS LIST
Description.
Taper Bearing Cup . . . . . . . . . . . . . . .
Magnetic Drain Plug . . . . . . . . . . . . . .
Gear Case . . . . . . . . . . . . . . . . . . .
Gear Case Assembly
(Consists of Items #1, 3 & 42).
Drive Gear
Drive Gear & Bearing Assembly . . . . . . . . .
(Consists of Items #4, 5 & 6).
Oil Slinger . . . . . . . . . . . . . . . . . .
Taper Bearing Cone
Thrust Washer - S.D. Gear . . . . . . . . . . .
Thrust Washer - Cluster Gear
Step Down Gear
Roller Bearing (Cluster Gear) . . . . . . . . .
Cluster Gear
Bearing Spacer
Thrust Washer - Cluster Shaft . . . . . . . . .
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