SRT55D Off-Highway Truck
9-2
Safety, Operation and Maintenance Manual
Maximum torque (1500rpm)……….…3118N •m
(2300Ib ft)
Number of cylinders/conguration……6, in line
Bore x stroke…….………………...159×159mm
(6.25×6.25in)
Total displacement………………..19L (1150in
3
)
Transmission
Make/model………………… Allison H6620AR
automatic electronic control with soft shift
feature. Remote mounted in the frame.
Integral TC 682 torque converter and planetary
gearing. Six speeds forward, two reverse.
Automatic converter lockup action in all speed
ranges. Downshift inhibitor. Integral hydraulic
retarder.
Forward
gear
1
st
gear
2
nd
gear
3
rd
gear
4
th
gear
5
th
gear
6
th
gear
Ratio 4.00 2.68 2.01 1.35 1.00 0.67
km/h 9.9 14.6 19.5 29.1 39.3 57.5
mile/h 6.1 9.1 12.1 18.1 24.4 35.7
Reverse
gear
R1 R2
Ratio 5.15 3.46
km/h 6.6 11.8
mile/h 4.1 7.3
Driving axle
Heavy duty axle with single reduction spiral
bevel gear differential, full oating axle shafts,
and planetary reduction at each wheel.
Ratios:
Differential…………………………………3.73:1
Planetary………………………….……….5.80:1
Total reduction…………………………...21.63:1
Suspension
F r o n t : M a c p h e r s o n t y p e i n d e p e n d e n t
Technical Data
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