Blower Loss Pressure Switch Adjustment; Sync Transformer Checkout; Power Contactor Position Sensor Adjustment - Komatsu 830E Shop Manual

8.2 Blower Loss Pressure Switch Adjustment

NOTE: If wheelmotors were not installed on truck during factory check-out, this test must be
performed during truck check-out at mine site. Be certain the rear axle box door is closed and the
rear wheel covers are installed.
1. Setup PTU to read the MONITOR REAL TIME DATA SCREEN to monitor the BLOWP digital
input signal. This signal will be displayed in regular display (false) when the engine is off.
2. Start engine with selector switch in NEUTRAL. The BLOWP signal should be Off (false). Slowly
increase engine speed to 800 to 1000 rpm.
Verify the BLOWP signal changes from false to =true (inverse display) as engine speed
reaches 800 to 1000 rpm and remains =true at higher rpm.
3. If the switch does not operate in the above rpm range, shut down engine and readjust the
blower pressure switch.
4. After adjustment, repeat the above steps until switching occurs at the proper rpm.

8.3 SYNC Transformer Checkout

NOTE: If sync transformer output voltage feeding motor or alternator sync inputs at FB102/140
analog I/O card is suspect, perform the following check:
1. Remove power and check that sync transformers ST1 and ST2 are properly connected.
2. Disconnect leads 716C, 716D, 716H, and 716J at sync transformers and read approximately 11
ohms across each transformer secondary windings.
3. Disconnect leads 74E, 71J, 75X, and 71K at transformers and read approximately 560 ohms
across each transformer primary.
4. Reconnect all leads that were disconnected.

8.4 Power Contactor Position Sensor Adjustment

1. P1 and P2 Contactors:
a. With coil de-energized, adjust screw on position sensor to just close N.O. circuit, then turn
screw an additional 2 1/4 turns CW.
2. All other Power Contactors:
a. With coil de-energized, place a 0.081 (#46 drill bit) shim between main tips and then close
tips manually. (DO NOT ENERGIZE COIL). The normally open position sensor contacts
should read open with an ohmmeter.
b. Place a 0.041 (#59 drill bit) shim between the main tips and then close tips manually. The
position sensor contacts should now read closed.
E03012 2/02 Statex III Electrical Checkout Procedure E3-43