12. The load box screen should be recorded and
values compared to values calculated to account
for parasitic losses at the elevation of the test site
and ambient temperature during testing as fol-
lows:
Trucks with DDEC engine:
a. The output horsepower should be 2700 HP ±5%
@ 1900 +10, -15 rpm.
b. The requested rpm from GE must be 1910 rpm.
c. Refer to Figure 3-14 for parasitic losses curve.
1.) Read the parasitic losses from the graph
based on ambient temperature and altitude.
2.) Add the value on the graph to the delivered
HP to GE and compare that to the “-5%”
value at the rpm rated tolerance. (i.e. 2612
HP plus value from graph = corrected HP)
Trucks with Komatsu SSDA16V160 engine:
a. The output horsepower should be 2700 HP ±5%
@ 1900 +10, -15 rpm.
b. The requested rpm from GE must be 1900 rpm.
c. Refer to Figure 3-13 for parasitic losses curve.
1.) Read the parasitic losses from the graph
based on ambient temperature and altitude.
2.) Add the value on the graph to the delivered
HP to GE and compare that to the “-5%”
value at the rpm rated tolerance. (i.e. 2612
HP plus value from graph = corrected HP)
Manual Offset HP Output Adjustment
If necessary to troubleshoot HP problems, use the
following procedure:
13. With loadbox initiated, cursor to “HP Offset” {enter}
¤
Cursor to => 0 HP
¤
Input a + or - offset but not greater than +300 {en-
ter}
14. Perform load test again.
¤
Return offset to 0.0 {enter}
¤
cursor to HP Offset {enter}
¤
cursor to LDBXINIT {enter}
15. Exit the loadbox test mode:
¤
Cursor to LDBX INIT on the Loadbox Screen and
press {enter}.
16. Note engine temperature and pressure gauges for
normal values.
17. Place Rest Switch in the ON position.
18. Turn key switch OFF. Allow steering accumulators
to bleed down.
19. Record all data to create a truck record for future
comparison.
FIGURE 3-12. SELF LOAD TEST, RP1, 2 & 3 PICKED UP
E03015 3/01 AC Drive System Electrical Checkout Procedure E3-33
(Release 17 Software)
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