Additional Truck Checks; Hoist & Steering Circuit Switch Checks; Aux Blower Rotation Check; Brake System Pressure Switch Checks - Komatsu 930E-2 Shop Manual

ADDITIONAL TRUCK CHECKS

• • • • Be certain Rest Switch is ON.
• • • • Place Inverter Cutout switches in the CUTOUT
(down) position.
1. Start engine and allow engine to warm up for
approximately 10 minutes.
Hoist & Steering Circuit Switch Checks:
2. On the inner side of the fuel tank, short Circuit 39
on hoist circuit hydraulic filters bypass indicator
switch, to ground.
The Hydraulic Oil Filter light in overhead
turns on.
3. At the steering circuit hydraulic filter, short circuit
39 on filter bypass indicator switch to ground.
The Hydraulic Oil Filter light in overhead
turns on.
4. On the fuel tank, short Circuit 38 at low fuel level
switch to ground.
The Low Fuel light indicator in the overhead
should light.
5. Short Circuit 51A at nitrogen precharge pressure
switches on top of steering accumulators to
ground.
The Low Accumulator Precharge indicator
light is activated. This light stays on even
when the short is removed.
6. Use engine shutdown switch on selector switch
console to shut down engine. Do not turn Key
Switch OFF.
The Accumulator Precharge light should re-
main on and brakes and steering pressure
remain charged.
7. Turn key switch OFF.
Verify steering pressure bleeds down.

Aux Blower Rotation Check

If the blower has been replaced or cables removed and
reinstalled, verify correct blower rotation to insure cor-
rect hookup.
1. Remove the inspection cover from the Aux Blower
on the grid side of the truck.
2. Verify Inverter Cutout Switches are in the CUT-
OUT position (down).
E3-28 AC Drive System Electrical Checkout Procedure
(Release 17 Software)
3. Start the engine.
4. Move the GF Cutout Switch to the NORMAL
position.
5. Move the Rest Switch to the OFF position.
6. Check the rotation of the Aux Blower.
Make sure it is rotating counterclockwise as
viewed from the driver side of the truck.
Verify the Link Voltage lights are ON.
Verify that the exhaust holes on the control
cabinet are free of debris and air is flowing
out of them.
7. Move the Rest Switch to the REST position.
Note the Link Energized lights turn off.
8. Shut down the engine.
9. Replace the Aux Blower cover.

Brake System Pressure Switch Checks:

1. Start the engine.
2. Verify the following:
All indicator lights on overhead are OFF ex-
cept System Rest, Propel System Not
Ready and Park Brake.
3. Individually check (other than the differential pres-
sure switch in rear axle housing) the service brake
system switches on the truck. (This can be done
by shorting the circuit to ground, momentarily.
The circuits are active while being shorted.)
a. Front to rear brake differential Circuit 33Z, in the
front of operator cab. (There is a 5-second
delay timer in this circuit.)
b. Front differential brake Circuit 33Z in the brake
cabinet. (There is a 5-second delay timer on
this circuit.)
4. Put brake lock switch ON.
a. Short Circuit 33T to ground (brake lock degra-
dation pressure switch located in brake cabi-
net). (There is a 5.0-second delay timer on this
circuit.)
b. Note that when the brake lock is applied, the
service brake lights on the truck are active and
the service brake light indicator on the over-
head display illuminates.
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