Komatsu 830E-AC Shop Manual page 458

Brake Circuit Switch Checks
1. Turn the rest switch ON.
2. Start engine and allow engine to warm up for
approximately 10 minutes.
Verify that all status/warning lights in the
overhead panel are off except Parking Brake
Applied (A3, Figure 3-11), Propulsion System at
Rest (B6) and Propulsion System Not Ready
(C6).
3. Turn the wheel brake lock switch ON.
4. Short circuit 33T to ground. This is for the brake
lock degradation switch located in brake cabinet.
Note that when the wheel brake lock is applied,
the service brake lights on the truck are active
and the service brake light indicator on the
overhead panel is lit.
5. Connect the serial communication cable from the
PTU to the PSC port (DIAG1) on the DID panel
located on the back wall of the operator cab.
Click START > Programs > GEOHVPTU_2.0 >
AC TOOLS > wPTU AC v21.01
Select "Normal" mode {enter}
Type password "ok75e" {enter}
Click "LOGIN to wPTU Toolbox".
Under "Real Time", double-click "PSC Real Time
Data".
Verify that BRAKEON is highlighted when the
wheel brake lock is applied and the engine is
running.
6. Turn the wheel brake lock switch OFF.
7. In the brake cabinet, short circuit 33 on the brake
pressure switch to ground.
The low brake pressure light on the overhead
panel and the low brake pressure buzzer should
activate.
8. On the LH frame rail, short circuit 33F at the
steering pressure switch on the bleeddown
manifold to ground.
The low brake pressure light, low steering
pressure light and low brake pressure buzzer
should activate.
E3-28 AC Drive System Electrical Checkout Procedure
(Version 21 Software)
Hoist & Steering Circuit Switch Checks
9. 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 the overhead panel
should illuminate.
10. At the steering circuit hydraulic filter, short circuit
39 on the filter bypass indicator switch to ground.
The hydraulic oil filter light in the overhead panel
should illuminate.
11. Short circuit 51A at the nitrogen precharge
pressure switches on the top of the steering
accumulators to ground.
The low accumulator precharge indicator light is
activated. This light stays on even when the
short is removed.
12. Use emergency shutdown switch on the center
console to shut off the engine. Do not turn the key
switch OFF.
The low accumulator precharge light should
remain on and the brakes and steering pressure
should remain charged.
13. Turn the key switch OFF.
Verify that the steering pressure bleeds down.
Link Energized Checks
1. Start the engine.
2. Move the GF cutout switch to the NORMAL (up)
position.
3. Turn the rest switch OFF.
Click START > Programs > GEOHVPTU_2.0 >
AC TOOLS > wPTU AC v21.01
Select "Normal" mode {enter}
Type password "ok75e" {enter}
Click "LOGIN to wPTU Toolbox".
Under "Real Time", double-click "PSC Real Time
Data".
Verify that capacitor charge light (3, Figure 3-1)
and the link energized indicator light on the rear
of the center console are lit.
Verify that LINKV and both inverter link voltages
(I1LV & I2LV) are approximately 700 volts.
Verify the other values and highlighted functions
are similar on the various PSC screens in
Figures 3-12 through 3-14.
10/06 E03018