Motor Rotation Test - Komatsu 830E Shop Manual

8.6.2 ISOA3, ISOA4, ISOA5, ISOA6, ISOA-7, and ISOA-8 Test.
1. Connect a voltmeter between terminal "D" (+) and terminal "F" (-) of the Iso-Amp to be tested.
2. Turn the control power On.
Verify the voltage at "D" is less than 0.030 volts.
3. Turn the control power switch "Off". Disconnect the terminal "B" input for each Iso-Amp:
•
75A for ISOA3
•
75C for ISOA4
•
717S for ISOA5
•
72T for ISOA6
•
72W for ISOA7
•
73Y for ISOA8
4. Connect a jumper wire from terminal "C" to terminal "F" and another from terminal "A" to termi-
nal "G".
5. Turn the control power switch On.
Verify the voltage at terminal "D" is 1.00 ±0.05 volt.
6. Turn the control power switch Off. Remove the jumper wires and meter.
7. Reconnect 75A, 75C, 717S , 72T, 72W, and 73Y wires disconnected at ISOA3, ISOA4, ISOA5,
ISOA6, ISOA7, and ISOA8.
8. Reconnect 74C at GFR.

8.7 Motor Rotation Test

NOTE: If wheelmotors were not installed on truck during factory check-out, this test must be
performed during truck check-out at mine site.
If rear wheels are raised off ground:
1. Start the engine and place the selector switch in FORWARD.
2. Depress the accelerator pedal just far enough to enter propel state and the wheelmotors begin
to rotate.
Verify both wheelmotors turn forward.
If rear wheels and tires are installed and resting on the ground:
•
Check each wheel motor individually with the following cable hookup:
1. Place a jumper across the left wheelmotor armature (from cable 7GA1 (7G10 on the 830E) to
7J1) to check the right wheelmotor rotation.
2. Depress the accelerator pedal just far enough to enter propel state and the wheels begin to
rotate.
Verify the right wheelmotor is turning forward.
3. Place a jumper across the right wheelmotor armature (from cable 7J1 to 7J2) to check the left
wheelmotor rotation.
4. Depress the accelerator pedal just far enough to enter propel state and the wheels begin to
rotate.
Verify the left wheelmotor is turning forward.
5. Shut down the truck and remove the jumper cables.
E03012 2/02 Statex III Electrical Checkout Procedure E3-45