E3-40 Statex III Electrical Checkout Procedure 2/02 E03012
6.1 Load Test
1. Monitor horsepower output using the PTU AUTOMATIC LOAD BOX TEST SCREEN.
2. Put selector switch in FORWARD and depress throttle to load engine.
3. With the engine at full RPM, record the following from the PTU screen:
NOTE: All information on the screen can be conveniently recorded by selecting “GET1” with the
cursor, pressing [ENTER], and then pressing [F2] to save the information to a file.
Engine RPM
Alternator volts
Motor 1 amps
Load box efficiency (“LB EFFICIENCY”)
Net HP to alternator
4. After recording the above information, release the throttle pedal.
5. Compare the “NET HP TO ALTERNATOR” value recorded from the PTU screen to the calcu-
lated Net HP to the alternator using the formula below:
NET HP TO ALT = (VOLTS x AMPS)
÷
(746 x LB Efficiency)
6. Verify the ENGINE RPM is approximately equal to the ENGINE LOAD RPM shown at the bot-
tom of the screen.
7. Verify the calculated NET HP TO ALT value is approximately equal to the measured NET HP
TO ALTERNATOR value read from the PTU screen within ±5%.
8. After completing test, restore all circuits to normal and reconnect fan clutch where applicable.
NOTE: Net horsepower may be affected by many variables such as ambient temperature, altitude,
fuel temperature, parasitic losses, tertiary losses, engine condition etc. Parasitic horsepower loss
values that have been corrected for temperature and altitude may be obtained from the Komatsu
Distributor.
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