Wheel Brake Lock Switch; Hazard Warning Lights; Heater/Air Conditioner Vents; Engine Oil Pressure Gauge - Komatsu 930E-4SE Operation & Maintenance Manual

Operator Cab And Controls - Section 32
Page 32-16

Wheel Brake Lock Switch

Wheel brake lock switch (5, Figure
32-8) should be used with engine
running for dumping and loading
operations only. The brake lock
switch actuates the hydraulic brake
system which locks the rear wheel
service brakes only. When pulling
into shovel or dump area, stop the
truck using the foot-operated service
brake pedal. When
completely stopped and in loading position, apply the
brake lock by pressing the top of the rocker switch.
To release the brake, press the bottom of the rocker
switch.
NOTE: Use at the shovel and dump only to hold the
truck in position.
Do not use the wheel brake lock switch to stop
the truck unless foot-operated treadle valve is
inoperative. Use of this switch applies rear
service brakes at a reduced, unmodulated
pressure. Do not use brake lock for parking. With
engine stopped, hydraulic pressure will bleed
down, allowing brakes to release.
Hazard Warning Light Switch
Hazard warning light switch (6,
Figure 32-8) flashes all the turn
signal lights. Pressing the bottom of
the rocker switch activates these
lights. Pressing the top of the rocker
switch turns these lights off.

Heater/Air Conditioner Vents

Heater/air conditioner vents (7, Figure 32-8) may be
directed by the operator to provide the most
comfortable cabin air flow.
truck is

Engine Oil Pressure Gauge

Engine oil pressure gauge (8, Figure
32-8) indicates pressure in the
engine lubrication system.
Normal operating pressure after
engine warm-up should be:
Idle: 138 kPa (20 psi) minimum
Rated Speed: 310 - 483 kPa (45 - 70 psi)

Right Turn Signal Indicator

Indicator (9, Figure 32-8) illuminates to indicate that
the right turn signals are operating when the turn
signal lever on the steering column is moved upward.
Moving the lever to its center position will turn the
indicator off.

Digital Tachometer

Digital tachometer (10, Figure 32-8) registers engine
crankshaft speed in hundreds of revolutions per
minute (rpm).
Governed Speed
Low Idle
High Idle
Full Load

High Beam Indicator

When lit, high beam indicator (11, Figure 32-8)
indicates that the headlights are on high beam. To
switch the headlights to high beam, push the turn
indicator lever away from the steering wheel. For low
beam, pull the lever toward the steering wheel.

Speedometer/Payload Meter Display

Speedometer/payload meter display (12, Figure 32-
8) indicates the truck speed in kilometers per hour
(kph) or in miles per hour (mph). The display also
shows payload meter
information, see Section 60, Payload Meter III.
8/11 OM3245
750 rpm
1910 rpm
1900 rpm
information. For more