Komatsu 830E Shop Manual page 362

The steering circuit can be isolated from the brake
circuit by removing the brake supply line from the
bottom side of the bleeddown manifold (refer to
WARNING below). Plug the brake supply line and
cap the port in the bleeddown manifold.
Before disconnecting pressure lines, replacing
components in the hydraulic circuits, or install-
ing test gauges, ALWAYS bleed down hydraulic
steering and brake accumulators.
Hydraulic fluid escaping under pressure can
have sufficient force to enter a person's body by
penetrating the skin and cause serious injury,
and possibly death, if proper medical treatment
by a physician familiar with this type of injury is
not received immediately.
J4-2
The steering accumulator can be bled down with
engine shut down, turning key switch "Off", and
waiting 90 seconds. Confirm the steering pressure
is released by turning the steering wheel - No front
wheel movement should occur. Fully open both
bleed down valves on brake manifold to bleed down
brake accumulators.
Before disabling brake circuit, be sure truck
wheels are blocked to prevent possible rolla-
way.
FIGURE 4-2. BRAKE MANIFOLD
Brake Circuit Check-Out Procedure J04031