Komatsu 830E-AC Shop Manual page 978

7. Tighten four cap screws (10).
8. Check for proper steering wheel rotation without
binding. Be certain wheel returns to neutral after
rotating 1/4 turn left and right.
9. If disconnected, re-connect the hoses to the
steering control unit.
10. Connect the steering column wire harness(es)
to the harness(es) in the cab.
PEDALS
Service Brake Pedal
The service brake pedal (2, Figure 5-1) is a foot oper-
ated pedal which applies the service brakes. Service
brakes should only be applied when dynamic retard-
ing requires additional braking force to slow the truck
speed quickly. They should also be used to bring the
truck to a complete stop once the speed is less than
4.8 kph (3 mph).
Dynamic Retarding
Dynamic retarding is a braking torque (not a brake)
produced through electrical generation by the wheel-
motors when the truck motion (momentum) is the
propelling force.
For normal truck operation, dynamic retarding
should be used to slow and control truck speed.
Dynamic retarding is available in FORWARD/
REVERSE at all truck speeds above 0 kph/mph;
however, as the truck speed slows below 4.8 kph (3
mph), the available retarding force may not be effec-
tive. Use the service brakes to bring the truck to a
complete stop.
Dynamic retarding will not hold a stationary truck on
an incline.Use the parking brake or wheel brake lock
for this purpose.
N5-6
Dynamic retarding is available in NEUTRAL only
when truck speed is above 4.8 kph (3 mph).
When dynamic retarding is in operation, engine rpm
will automatically go to an advance retard speed set-
ting. This rpm will vary depending on temperature of
several electrical system components.
Dynamic retarding will be applied automatically if the
speed of the truck obtains the maximum speed set-
ting programmed in the control system software.
When dynamic retarding is activated, an indicator
light in the overhead display will illuminate. The
grade/speed retard chart should always be used to
determine safe downhill speeds. Refer to Grade/
Speed Retard Chart in this chapter.
Dynamic Retard Pedal
Dynamic retard pedal (3, Figure 5-1) is a foot oper-
ated pedal which allows the operator to slow the
truck and maintain a safe productive speed without
the use of the service brakes. For normal truck oper-
ation, only dynamic retarding should be used to slow
and control the speed of the truck. The Grade/Speed
Chart (8, Figure 5-1) should always be followed to
determine MAXIMUM safe truck speeds for descend-
ing various grades with a loaded truck. Service
brakes should be applied only when dynamic retard-
ing requires additional braking force to slow the truck
speed quickly or to bring the truck to a complete stop.
When dynamic retarding is in operation, the engine
rpm will automatically go to an advance rpm retard
speed setting (usually 1250 rpm)*. Dynamic retarding
will be applied automatically, if the speed of the truck
reaches the predetermined overspeed retard setting.
Dynamic Retarding is available in FORWARD/
REVERSE at all truck speeds above 0 kph/mph, but
is available in NEUTRAL only when truck speed is
above 4.8 kph (3 mph).
Operator Controls 10/06 N05070