TM 9-2320-211-20
flexible shaft, and insert the end of the shaft
2-335. Tachometer
through the grommet in the cab cowl. Position the
closed clip on the mounting bracket attached to the
a. Removal.
engine, and secure it with the capscrew and nut.
(1) Remove the instrument cluster (para 2-
NOTE
143).
When positioning the flexible shaft in the
(2) Unscrew the nut securing the tachometer
v e h i c l e , be sure that the end with the
flexible shaft to the tachometer. Pull the shaft away
driving key is at the sending unit.
from the tachometer.
(2) Aline the key on the end of the flexible
bayonet type electrical
(3) Remove the
shaft with the keyway in the sending unit, insert the
c o n n e c t o r from the clip secured to the upper
end of the shaft in the unit, and tighten the con-
tachometer mounting stud.
nector nut.
( 4 ) Remove the nut, lockwasher, and con-
(3) Insert the square end of the flexible shaft
nector clip from the upper stud.
i n the tachometer (fig. 2-33), and tighten the
(5) Remove the nut and lockwasher from the
connector nut.
lower tachometer mounting stud, and remove the
mounting bracket from the studs.
2-337. Tachograph
(6) Remove the tachometer from the front of
a. Removal.
the instrument cluster.
(1) Remove the instrument cluster (para 2-
b. Installation.
143).
(1) Insert the tachometer unit into the proper
(2) Disconnect the flexible shafts (two) and
opening of the instrument cluster from the front.
wiring on the rear of tachograph.
(2) Install the tachometer mounting bracket
(3) Remove the two retaining wing nuts and
on the studs at the back of the instrument cluster.
then remove the tachograph assembly through the
(3) Install the lockwasher and nut on the
front of the instrument cluster panel.
lower stud, and tighten the nut.
b. Installation.
(4) Assemble the connector clip, lockwasher,
(1) Insert the tachograph unit into the proper
and nut on the upper mounting stud, and tighten
instrument cluster opening, and secure it with two
the nut.
wing nuts.
(5) Insert the panel light cable bayonet type
(2) Connect the flexible shafts and wiring to
connector into the clip.
the rear of the tachograph unit.
(6) Insert the end of the flexible shaft in the
(3) Secure the instrument cluster to the panel
tachometer, and tighten the connector nut.
(7) Secure the instrument cluster to the panel
The tachograph flexible shafts are the same as
those used for the speedometer and tachometer.
a. Removal.
Refer to paragraphs 2-334 and 2-336 for removal
(1) Unscrew the nut securing the tachometer
and installation procedures.
flexible shaft to the tachometer (fig. 2-33), and pull
2-339. Tachograph Light Bulb Replacement
the shaft from the tachometer.
NOTE
NOTE
Do not try to remove the front instrument
The sending unit is located on the
glass to change the light bulbs.
distributor drive housing on the gasoline
a. Open the front of the tachograph unit with the
engine, on the right side of the engine block
locking key.
on the diesel engine, and on the timing
b. Remove the paper chart to expose the three
chain cover on the multifuel engine.
light receptacles (the base of the bulbs will show).
(2) Unscrew the nut securing the flexible shaft
c. Lift the edge of the strap (this strap is hinged
to the tachometer sending unit, and pull the shaft
on one side), and lift the bulb out of the receptacle.
end from the sending unit.
2-340. Using the Tachograph
(3) Remove the capscrew and nut securing the
a. Placing in Operation.
closed clip to the mounting bracket bolted to the
CAUTION
engine.
Do not operate the tachograph without a
(4) Pull the flexible shaft from the rubber
chart.
grommet in the cab cowl, and remove the shaft
(1) Fill in the new chart with the name of the
from the vehicle. Remove the closed clip from the
operator and assistant operator, the registration
flexible shaft.
number of the vehicle, the date, and the readings of
b. Installation.
the total mileage counter and the engine revolution
(1) Install the closed clip on the tachometer
counter.
