23
777F Off-Highway Truck specifications
0 1020 3040506070 80
0 5 10 15 20 25 30 35 40 45 50
050 lb x 1000
mph
km/h
15%
Speed
Continuous Grade Length
Effective Grade
(Grade Minus Rolling Resistance)
0 30 60 90 120 150 180 210 240 kg x 1000
Gross Weight
1st Gear
5%
10%
100 150 200 250 300 350 400 450 500
4th Gear
5th Gear
6th Gear
30%
2nd Gear
3rd Gear
25%
20%
EL
7th Gear
To determine retarding performance: Add lengths of all
downhill segments and, using this total, refer to proper
retarding chart. Read from gross weight down to the percent
effective grade. Effective grade equals actual % grade minus
1% for each 10 kg/t (20 lb/ton) of rolling resistance. From this
weight-effective grade point, read horizontally to the curve
with the highest obtainable gear, then down to maximum
descent speed brakes can properly handle without exceeding
cooling capacity. The following charts are based on these
conditions: 32° C (90° F) ambient temperature, at sea level,
with 27.00 R49 tires.
NOTE: Select the proper gear to maintain engine rpm at the highest
possible level, without overspeeding the engine. If cooling oil
overheats, reduce ground speed to allow transmission to shift to
the next lower speed range.
Retarding Performance
With ARC Only
ARC and Engine Brake
E – Typical Field Empty Weight
L – Target Gross Machine Operating Weight 163 293 kg (360,000 lb)
