Purpose.

TM 9-2320-211-20-3-2

Purpose.

(1) General. The chart contains important information as to how the truck

is being driven. The recordings on the chart will give you the answers to questions,

such as:

(a) How much is the truck used?

(b) How many stops did the truck make and how long were the stops?

(d) Was the engine left idling too long?

(e) Was the engine warmed up correctly and shut off correctly?

(f) Was the truck driven in the right rpm range?

(g) Was the engine being over speeded?

(h) Was the transmission shifted into the correct gears at all times?

(i) What is the total engine rpm compared to total miles driven?

Tachograph automatically records the answers to these questions on the chart.

Recordings on the chart just have to be read correctly.

(2) Time range for evaluation. The time needed to read the chart depends

on which recordings are being read. A complete daily reading of the chart is not

necessary to make an analysis for a year. Readings can be taken every day for one

month, then these readings can be spread out to give a year reading. For a complete

detailed reading, a time of one or two minutes a chart is all that is needed.

(3) Working times. A new chart is put into the tachograph at the start of

duty hours. The beginning and end of the recordings on the chart should be within

duty hours. By adding the parts of the times marked on the red band by the stop

and go stylus, you will get the exact amount of driving, that was done during duty

hours. The thin line recordings on the chart show pauses or breaks.

NOTE

Make sure trucks have not been used without

permission after duty hours.

(4) Traveling periods. Traveling time is read by the length of broad bands

on the stop and go field. These recordings show how much time the driver was at

the wheel. The total amount of time traveled can be figured by adding broad bands

in the stop and go field. It is also important in figuring average speed and how the

truck is being driven.

(5) Stopped time. Thin lines between broad bands on the stop and go fields

show the time the truck was stopped. The stopped time can be figured by adding the

thin lines in the time periods. When the truck is used locally, there may be a lot of

stopped time. Some reasons for a lot of stopped time periods are:

(a) Loading and unloading.

(b) Waiting at a loading space.

(d) Pauses in work.