Load Test Using Truck Retard Grids - Komatsu 830E Shop Manual

6.0 LOAD TEST USING TRUCK RETARD GRIDS

NOTE: DO NOT RUN OPEN CIRCUIT TEST.
NOTE: The single ended grid used on the 772 wheel drive system will be operating at 100%
capacity when loaded with a 1200 HP engine. The grid should be monitored closely on
extended horsepower tests to avoid overheating.
Setup and Preparation
Engines equipped with Rockford Clutch only:
•
Disconnect the fan clutch solenoid to fully engage fan.
All trucks:
•
Connect swing shunts to load test position:
a. Top shunt swings to upper position, bottom shunt swings to bottom position.
b. For 830E or 685E trucks, left shunt swings to left position, right shunt swings to right position.
To disable the motor field:
•
Disconnect circuit 716E at "-1" terminal on the GFM on the MFSE.
•
Disconnect circuit 716F at "+2" terminal on the GFM on the MFSE.
PTU Setup
•
Select the AUTOMATIC LOAD BOX TEST screen as follows:
a. From the GEOHV STATEX III MENU, select "PTU TALK TO TRUCK", press [ENTER].
b. At PTU LOGON screen, enter your name and assigned password. Press [ENTER].
c. When the GE STATEX III PTU MAIN MENU appears, move the cursor to "NORMAL OPER-
ATION" and press [ENTER].
d. A screen appears with the message: "Selection of NORMAL OPERATION gives truck con-
trol to the driver - Continue?". With the cursor at the "Yes" option, press [ENTER].
e. The NORMAL OPERATION MENU will appear. Select "AUTOMATIC LOAD BOX TEST"
and press [ENTER].
E03012 2/02
If load test must be run any longer than to just read horsepower,
the motor field leads must be disconnected to prevent overheat-
ing of the motor fields. Follow disable procedure below:
Statex III Electrical Checkout Procedure E3-39