Emergency Steering System - Komatsu 830E-AC Shop Manual

EMERGENCY STEERING SYSTEM

Operation
The truck is equipped with an emergency steering
system in the event of a failure in the oil supply to the
main steering system. The emergency steering sys-
tem was designed to meet or exceed SAE J1511 and
ISO 5010 standards.
If the low steering system pressure indicator light and
alarm are activated, a failure in the hydraulic oil sup-
ply to the steering and brake system exists. When
the alarm is activated, there is enough hydraulic
pressure stored in the brake and steering accumula-
tors to allow the operation of the steering and brake
functions. However, this oil supply is limited. There-
for, it is important to stop the truck as quickly and
safely as possible after the alarm is first activated.
If the oil supply pressure drops to a pre-determined
level, the low brake pressure warning light will also
illuminate. If the oil pressure continues to decrease,
the brake auto-apply feature will activate and the ser-
vice brakes will apply automatically to stop the truck.
1. Stop the truck as quickly as possible by using
the foot pedal to apply the service brakes. If
possible, steer the truck to the side of the road
while braking.
2. When stopped, shift the directional control lever
to PARK. This will apply the parking brake.
3. Turn the key switch OFF and notify mainte-
nance personnel.
4. If safe to do so, place wheel chocks in front or
behind the wheels so that truck can not roll.
5. If traffic is excessive near the disabled machine,
mark the truck with warning flags during day-
light hours or use flares at night. Adhere to local
regulations.
A03030 3/06
Testing
Ensure no one is near the front tires during this
test. All personnel are warned that the clearances
change when the truck is steered and this could
cause serious injury.
This test can only be performed with an empty truck.
If the truck passes this test, the emergency steering
system is functioning properly.
General Safety and Operating Instructions
1. Ensure no one is near the front tires during this
test. Use a spotter to keep the area around the
front tires clear of personnel during this test.
2. Start the engine and allow the hydraulic system
to reach full pressure and the accumulators to
fill with oil.
3. Shut the engine off by using the engine stop
button located on the center console. DO NOT
turn the key switch OFF.
4. Turn the steering wheel.
q If the front tires respond to the steering
wheel input, the
system is functioning properly. Turn the key
switch to the OFF position.
q If the front tires do not steer, turn the key
switch to the OFF position and notify
maintenance personnel immediately. Do
not drive the truck until the problem has
been repaired and the truck can pass this
test.
emergency steering
A3-33