1915-07-01 Marmon 41, Info Book, 1534-B wm
Instruction Manual for my 1915 Marmon 41 Club Roadster that my Grandfather bought new 1915. I still drive it today,
Instruction Manual for my 1915 Marmon 41 Club Roadster that my Grandfather bought new 1915. I still drive it today,
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2. Transmission of Power<br />
The clutch, change-speed gear (or "transmission"), univer-.<br />
sals, bevel gears, differential and driving axles, are the parts<br />
employed in transmitting motor power to the rear wheels.<br />
The Clutch permits the motor to run free or to propell the<br />
ear through the transmission mechanism as desired. The normal<br />
engagement of the cone within the flywheel is by a spring and<br />
thrust bearing encircling the crank shaft extension. Depressing<br />
the clutch pedal moves the cone back free from the flywheel in<br />
released position. The clutch cone is faced with a friction fabric<br />
to which no powder, fluid, or other substance should be applied.<br />
The surface is best just as it is. An oily fabric may be cleaned<br />
with gasoline and a steel brush, but will never regain its original<br />
qualities.<br />
On account of the construction of this clutch, no adjustment<br />
for easy engagement is ever necessary.<br />
Clutch Brake governs the time required to stop the clutch<br />
rotation when disengaged, by a disc coming in contact with a<br />
CRANK<br />
SHAFT<br />
PILOT SHAFT<br />
BUSHING<br />
WO 10 V.<br />
CLUTCH SPRING<br />
FLY WHEEL<br />
CLUTCH FACING<br />
CLUTCH CONE<br />
LUTCH HOUSING<br />
PLUG<br />
"/„Afie<br />
Or' ETAINER <strong>41</strong>1111<br />
:1E4 THRUST BEARING<br />
CLUTCH SPRING NUT<br />
CLUTCH RELEASE GREASE CUP<br />
CLUTCH RELEASE YOKE<br />
sNvx""<br />
RELEASE BALL BEARING<br />
Figure 16. <strong>Marmon</strong> "<strong>41</strong>" Chtikh<br />
44<br />
LUTCH BRAKE DISC<br />
FELT WASHERS<br />
UN IVER5AL JOINT<br />
FILLER 'PLUG<br />
leather pad. If it is necessary to shift gears very rapidly in order<br />
to prevent clashing, the clutch brake stud may be moved back,<br />
giving a less severe action. If the clutch tends to "spin," delaying<br />
shifts without clashing, the pad may be "set up" in the same<br />
way.<br />
If it is found necessary to disassemble the clutch, proceed as<br />
follows:<br />
First remove the clutch pedal quill. In disassembling simply<br />
disconnect the circle of bolts on the rear flange at the transmission,<br />
also those on the flange of the Spicer joint, and this will permit<br />
you to remove the slip joint as a whole. Next disconnect the<br />
circle of bolts about the clutch cone and move back and out the<br />
throwout portion of the clutch as a unit. Both of these assemblies<br />
may readily be disassembled after removing, if necessary.<br />
The nut on the pilot shaft may now be removed and the<br />
thrust bearing and spring taken out, after which the clutch cone<br />
can be lifted back and out.<br />
Change-Speed Gear or "Transmission"<br />
A characteristic of the gasoline motor is that it, produces<br />
much greater power at the higher speeds than at low speeds. Too<br />
heavy a load at a low motor speed will cause it to stop or "stall"<br />
when the same load at a high motor speed will be carried easily.<br />
The change speed gear. by increasing the ratio of motor speed to<br />
wheel speed, increases the effective power for starting, hard pulling,<br />
hill clinibing, etc. It also provides for the very slow running<br />
and reversing.<br />
•<br />
The main drive gear is carried on a shaft which turns with the motor<br />
when the clutch is engaged. This gear is always in Mesh with a larger gear<br />
on the counter shaft below. The counter shaft extends rearward and carries<br />
three other gears of varying size. Above the countershaft is a squared shaft<br />
continuing the direction of the main drive gear shaft, but free to move independent<br />
of it. This squared shaft carries two gears with squared holes which<br />
must turn with the shaft but which may slide forward and back upon it.<br />
The large sliding gear. is for low and reverse speeds and the smaller gear for<br />
intermediate and high. "Neutral" is shifting lever position when both these<br />
gears are riding free in the space between their respective engaged. positions.<br />
When the operator throws the lever into low speed position a finger forces the<br />
larger gear to slide into mesh with a small gear on the countershaft. The<br />
square drive shaft then revolves much more slowly than the motor, giving<br />
great power but•little speed to the rear wheels. intermediate speed causes<br />
the other gear to mesh with a larger countershaft gear, giving more speed.<br />
For high speed, this gear slides forward, engaging a clutch on the main drive<br />
gear direct, thus Making the drive shafts virtually into one continuous shaft.<br />
For reverse, the large sliding gear is made to engage a small idler gear, which'<br />
meshes with the countershaft instead of directly on the Countershaft gear,<br />
thus changing its direction.<br />
It will be seen that the whole drive system from motor to wheels, from a<br />
control standpoint, is in three independent sections, with the two joints between<br />
them at the cliitch and gear case respectively. The center section must<br />
<strong>Marmon</strong><strong>41</strong>.com<br />
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