Komatsu 830E-AC Shop Manual page 78

4. While the engine is warming up, check the
engine and related components for any leaks.
Check the hydraulic pump for leakage as well
as all hydraulic lines.
5. Listen for any abnormal engine noises.
6. Check the transmission and piping for leakage.
If leakage is evident, shut down the engine and
correct before continuing the checkout. Listen
for unusual sounds, which may indicate prob-
lems in components.
7. When the engine is up to operating tempera-
ture, check operation of the throttle circuit -
acceleration should be smooth. Watch the
gauges closely for any abnormal activity.
Proper temperatures and pressures are shown
in the Engine Operation and Maintenance Man-
ual.
AFTER ENGINE HAS STARTED
Any machine which is unsafe and/or not in top oper-
ating condition should not be assigned to an operator
for production use.
1. Become thoroughly familiar with steering and
emergency controls. Test the steering in
extreme right and left directions. If the steering
system is not operating properly, shut the
engine down, immediately. Determine the steer-
ing system problem and have repairs made
before resuming operation.
2. Operate each of the brake circuits at least twice
prior to operating and moving the machine.
These circuits include individual activation of
the service brake and parking brake from the
operator's cab.
a. Activate each circuit individually with the
engine running and with the hydraulic circuit
fully charged.
b. If any application or release of any brake cir-
cuit does not appear proper or if sluggish-
ness is apparent on application or release,
shut the engine down and notify mainte-
nance personnel. Do not operate the
machine until the brake circuit in question is
fully operational.
A7-10
3. Check gauges, warning lights and instruments
before moving the machine to insure proper
system operation and proper gauge functioning.
Give special attention to braking and steering
circuit warning lights. If warning lights come on,
shut down the engine immediately and deter-
mine the cause.
4. Cycle hoist controls and steering several times
to remove trapped air. Complete steering cycles
in both directions to verify steering response,
smoothness and reliability. Check seals and
lines for leaks.
5. When satisfied that all discrepancies have been
corrected, the vehicle is ready for a road test.
This test should be done only by a capable and
experienced operator and should be accom-
plished in a large open area where plenty of
maneuvering room is available. Some of the
road test items which should be covered will
include:
a. Repeated test of braking efficiency at pro-
gressively higher speeds. Start at slow
speeds. Don't take chances with higher
speeds until the machine has been deter-
mined to be completely safe.
b. Progressive upshifting and downshifting
through all speed ranges to insure proper
transmission shifting and synchronization.
6. When all tests and checks have been made and
the vehicle is ready for work, it should be visu-
ally rechecked and fully serviced according to
Section P, Lubrication and Service.
Some of the conditions (others may be found) which
might be encountered after a machine has been
exposed to the elements for a long period would
include:
• Increased corrosion and fungus growth on
electrical components in humid/tropical areas.
• Accelerated rust formation in humid climates.
• Increased sand and dust infiltration in windy, dry
dusty areas. (These conditions can approach
sand blasting effects.)
• Deterioration of rubber products in extreme cold
areas. Cables, hoses, O- rings, seals and tires
may become weather checked and brittle.
• Animal or bird's nests in unsealed openings.
Storage Procedures A07006