Retard Pot Maximum Setting Check; Retard Pot Minimum Setting Check; Accelerator Pedal Override Of Retard Speed Control - Komatsu 830E Shop Manual

5.2 Retard Pot Maximum Setting Check

1. Set the retard speed control potentiometer (in cab) to maximum and turn the retard speed con-
trol switch to the On position. Note the retard speed control light turns On.
2. Turn on oscillator, and the retard contactors should pick up. If not, increase frequency slightly
until the contactors pick up. Verify that the frequency and MPH observed agree with the empty
maximum retard pot mph speed setting. Turn off oscillator without disturbing frequency setting
and the retard contactors should drop out.

5.3 Retard Pot Minimum Setting Check

1. Set the retard speed control potentiometer to minimum and turn on oscillator. Retard contactors
should pick up.
2. Decrease oscillator frequency slowly until the retard contactors drop out. Verify this occurs at
approximately 3 MPH. Turn off oscillator.
3. Turn on oscillator and increase frequency until retard contactors pick up. This should occur at a
speed just slightly above the drop out frequency noted in step 2. Turn off oscillator. Contactors
should drop out.

5.4 Accelerator Pedal Override of Retard Speed Control

1. Set the retard speed control switch to Off position and the retard speed control potentiometer to
mid range.
2. Place selector switch in FORWARD and depress throttle pedal. The propulsion contactors
should engage. Release throttle pedal.
3. Turn the retard speed control switch to On position. Turn oscillator On and increase frequency
until retard contactors pick up.
4. Depress throttle pedal. The throttle pedal should override; the retard contactors should drop out
and the propulsion contactors should energize.
5. Release throttle pedal, place selector switch in NEUTRAL and turn retard speed control off.
6. Turn off and disconnect oscillator.
Return to Main Menu
1. This completes the checkout of the retard speed control system.
2. Leave the PTU RETARD STATE LOGIC SCREEN screen by moving cursor to select "EXIT" on
the menu and press [ENTER] key.
3. Select "EXIT" as necessary until returned to GE STATEX III PTU MAIN MENU.
4. Move cursor to select "Exit" on the menu and press [ENTER] key.
5. At "QUIT PTU?" menu screen prompt , press [Y] key (or any key except [N]) to exit back to the
GE OHV STATEX III MENU.
NOTE: it is always necessary to exit back to this menu before turning off control power to avoid
lock up of PTU computer screen.
6. Turn control power Off, remove jumpers and restore all wiring back to the original condition.
E3-38 Statex III Electrical Checkout Procedure 2/02 E03012