Komatsu 930E-2, Shop Manual

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Periodic Inspections
It is important that periodic inspections (every three
months) of stored equipment be performed to insure
the continued serviceability of all protective measures
initially taken when the storage period began. Items
which should be checked at each inspection interval
are listed as follows:
1. Remove the weatherproof tape from the compart-
ment doors and preform a Megger test as de-
scribed in the Vehicle Test Instructions. Record
the test results and compare them with the re-
corded Megger readings taken when storage first
began, and those taken throughout the storage
period. Remove all test equipment and close up
the compartment. Reseal the compartment doors
with new weatherproof tape. If Megger readings
indicate a deterioration of insulation quality, to
below 2.0 megohms then consideration should be
given to providing more protection.
2. Check all other weatherproofing tape. Replace any
that has become loose or is missing completely.
3. Check all heat sources. Replace or repair any units
which have become inoperative.
4. Check all machine surfaces which were coated
with flushing compound when storage began. If
compound appears to be deteriorating, it must be
cleaned off and renewed.
Placing Equipment Into Service After
Storage
When taking equipment out of storage, perform the
following procedures:
When A Truck Is Operational
If a truck has been operated weekly throughout the
storage period, perform a complete visual inspection
of the Motorized Wheels, blowers, alternator and con-
trol compartments. Repair any defects found, then
place the truck directly into service.
When A Truck Is Not Operational
If the truck was not operated weekly throughout the
storage period, perform the following procedures:
1. Remove all weatherproofing tape from control
compartment doors and ductworks.
2. Remove all screening material from ductwork.
3. Remove all heat sources from Motorized Wheels,
control compartments and the alternator.
4. Fill with recommended oil. Refer to the Motorized
Wheel Service Manual for the type and amount oil
to be used. This oil should be drained and new oil
should be added after 500 hours of operation.
5. Clean all Motorized Wheel grease fittings in the
axle box. Insure that all grease lines are com-
pletely full of grease. Then add the recommended
amount of grease to all fittings.
6. Install brushes in the Motorized Wheels, blowers
and the alternator. Make sure that brushes move
freely in their carbonways and that they have
enough length to serve until the truck’s next in-
spection period. Install new brushes if necessary.
Insure that all brush pigtail screws are tight.
7. Perform a megohmmeter test. Refer to the truck’s
Vehicle Test Instructions for the correct proce-
dure. If Megger readings are less than 2.0 me-
gohms, the problem could be an accumulation of
moisture in motor or alternator. If this is the case,
the faulty component will have to be isolated and
dried out using procedures recommended in the
G.E.Service Manual.
8. Perform a thorough inspection of the Motorized
Wheels, alternator, blowers and control compart-
ments. Look for:
a. Rust or dirt accumulation on machine surfaces
b. Damaged insulation
c. An accumulation of moisture or debris
d. Loose wiring and cables
e. Any rust on electrical connectors in the control
compartment
f. Any loose cards in the card panels
g. Any accumulation of moisture or debris in duct-
work.
Clean and make repairs as necessary.
9. Check retarding grids and insulators for loose
connections and dirt accumulation. Clean and
make corrections as necessary.
10. Where applicable, check exciter drive belts for
cracks, and deterioration. If acceptable, set belt
tension to specification.
11. Before starting engine, turn on control power.
Check that contactors and relays pick up and drop
out normally.
12. Perform a start-up procedure on the complete
system to insure maximum performance during
service. Refer to the truck’s Vehicle Test Instruc-
tions for the complete test procedure.
A07003 Storage Procedures A7-15