TM 55-4920-384-13&P
the full load and no load speeds of the engine and the
hole corresponding thereto. The full load speed will
a clockwise direction one notch at a time until a very
be from 150 to 125 revolutions less than the no load
firm pressure is required to engage the clutch by the
speed. As an example, if the engine is to be operated
operating lever. Take-off shaft must be kept from
at 2000 revolutions per minute under load, the spring
turning when making this adjustment. Be sure to re-
should be hooked into the 8th hole in the governor
engage the adjusting ring lock into a notch in the
ring. Replace inspection cover.
lever and the spring tension adjusted by means of the
adjusting screw connected to the spring, to run 2125
For the Twin Disc clutch, pull adjusting lockpin out,
revolutions per minute, without load. The speed at
as shown in Fig. 38, and turn the adjusting yoke in a
full load will then be approximately 2000 revolutions
clockwise direction until the operating lever requires
per minute. A tachometer or revolution counter should
a distinct pressure to engage.
be used against the crankshaft while adjusting the
governor spring tension to give the proper engine
speed.
CLUTCH REDUCTION GEARS
CLUTCH AND REDUCTION UNITS
Clutch reduction gears are furnished with several
CLUTCH POWER TAKE-OFF
different ratios, some with spur gears, for counter-
enginewise rotation, others with internal gears, for
The clutch furnished with this model of engine is of
enginewise rotation. The clutch is of the dry disc
the dry disc type. No oil should be put into the clutch
type and no oil should be put into the clutch housing.
housing. There are three points on these clutches re-
quiring lubrication and these are filled with grease at
the factory, see Fig. 36. Grease gun fittings are fur-
nished for periodic lubrication. The housing bearing
and pilot bearing should receive additional grease
every fifty hours of operation. The clutch t h r o w o u t
bearing should be greased every day before starting.
Use Mobil Gargoyle grease BRB No. 3, Sinclair AF-1
grease, or equal.
CLUTCH ADJUSTMENT
If the clutch begins to slip, it should be readjusted,
otherwise it would become overheated and damaged.
F i r s t release clutch operating lever and remove
clutch inspection plate. For the Rockford clutch, turn
clutch over until adjusting ring lock is up. Release
lock with a screw driver or similar tool as shown in
104574C
104578C
104570C
D-23
