freightliner S2 - Speedometer and Tachometer; Standard Instruments

Check Transmission Indicator (diesel
engine only)
NOTE: Although it appears in the row of op-
tional indicator lights, the check transmission
indicator is a standard indicator light.
The check transmission indicator light, shown in
Fig. 3.8, notifies the driver of three things. The indi-
cator light has a solid illumination and any of the fol-
lowing items could be the cause for activating the
light:
•
oil life monitor (determines when the oil needs
to be changed)
•
filter life monitor (determines when the filter[s]
need to be changed)
•
transmission health monitor (determines when
clutch maintenance is required)
When the check transmission indicator illuminates,
refer to the Allison Operator’s Manual or contact cus-
tomer support at Allison Transmission to determine
the specific cause activating the indicator light.
Speedometer and Tachometer
Speedometer
Three kinds of speedometer faces are available. The
U.S. version of the speedometer registers speed in
both miles per hour (mph) and kilometers per hour
(km/h), with mph in larger numbers. See
Fig. 3.9.
The NAFTA version (not shown) of the speedometer
face reverses this arrangement, with km/h in larger
numbers. The metric only version (not shown) shows
km/h exclusively.
Tachometer
The tachometer indicates engine speed in revolutions
per minute (rpm) and serves as a guide for shifting
the transmission and keeping the engine in the ap-
propriate rpm range. See
Fig. 3.9.
Standard Instruments
Engine Oil Pressure Gauge
NOTICE
A sudden decrease or absence of oil pressure
may indicate mechanical failure. Bring the vehicle
to a safe stop and investigate the cause to pre-
vent further damage. Do not operate the engine
until the cause has been determined and cor-
rected.
The engine oil pressure gauge is mission-critical.
See
Fig. 3.10. If the engine oil pressure falls below
the preset levels shown in
Table 3.1, first the check
engine light will illuminate, and, if the condition does
not improve, the stop engine light will also illuminate
and the buzzer will sound. At this point, the engine
will derate or shut down, depending on the type of
engine protection system installed.
Coolant Temperature Gauge
NOTICE
A sudden increase in coolant temperature may
indicate engine or cooling system failure. Bring
the vehicle to a safe stop and investigate the
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02/28/2011
Fig. 3.8, Check Transmission Indicator
10/09/2001
0
5
10
15
20
30
RPM
5
15
25
35
45
55
65
75
85
MPH
km/h
25
X100
30
50
70
90
130
110
10
1 2
f610527
1. Tachometer 2. Speedometer
Fig. 3.9, Speedometer and Tachometer
Instruments
3.9