More Driving Tips and Techniques Operating Instructions
– 98 –
PB1318 3/01 Model 330
NOTE: Often these recommendations are second-
ary to maintaining an adequate and safe speed rela-
tive to the surrounding traffic and road conditions.
CAUTION: To avoid engine damage, do not let
the engine rpm go beyond the maximum gov-
erned rpm—valve damage could result if over-
speed conditions occur.
Use of Tachometer
The tachometer is an instrument that aids in obtaining the
best performance of the engine and manual transmission,
serving as a guide for shifting gears. Refer to the
Engine
Operation and Maintenance manual
for optimum engine rpm.
• If the engine rpm moves beyond the maximum governed
speed, indicating an overspeed condition, apply the ser-
vice brake or shift to a higher gear to bring engine rpm
within the optimum speed range.
ENGINE
MODEL /HP*
OPTIMUM
OPERATING
RANGE (rpm)
MAXIMUM GOVERNED SPEED
(rpm)
2000 2200
CUMMINS ISC ENGINES
215 1300-2200
•
230 1300-2200
•
250
1300-2200
(1)
•
1300-2000
(2)
•
275
1300-2000
(2)
•
285
1300-2000
(3)
•
300 1300-2000
•
* For engine model, see
Engine Operation and Maintenance Manual
.
(1) 660 lb-ft torque rating
(2) 800 lb-ft torque rating
(3) 860 lb-ft torque rating
Tachometer
02586
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