Komatsu 930E-2, Shop Manual

Page: 73 / 739

ELECTRIC DRIVE TRUCKS
Storage Instructions and Procedures
This instruction provides the recommended proce-
dures for protecting equipment from damage during
both short-term and long-term storage periods and for
maintaining adequate protection while in storage. Also
included are instructions for placing this equipment
into service after having been stored.
For the purposes of this instruction, a short-term stor-
age period is considered to be less than three months;
a long-term storage period is considered to be three
months or longer.
General Electric recommends a maximum storage pe-
riod of three years, with these storage procedures
being repeated after each year. After a storage period
of three years or more, the Motorized Wheels should
be removed and sent to an overhaul facility for tear-
down and inspection of seals and bearings. These
should be replaced if necessary.
Periodic (every three months) inspections should be
made to determine the lasting qualities of long-term
storage protection measures. Such inspections will
indicate the need for renewing protective measures
when necessary to prevent equipment deterioration.
Proper storage of this equipment is vital to equipment
life. Bearings, gears, and insulation may deteriorate
unless adequate protective measures are taken to pro-
tect against the elements. For example, bearings and
gears in the Motorized Wheel gear case are susceptible
to the formation of rust; insulation in rotating electrical
equipment can accumulate moisture; and bearings
may become pitted.
NEVER APPLY ANY SPRAY, COATING OR OTHER
PROTECTIVE MATERIALS TO AREAS NOT SPECIFI-
CALLY RECOMMENDED .
It is also important to note that these instructions
cannot possibly anticipate every type of storage con-
dition and, therefore, cannot prevent all equipment
deterioration problems caused by inadequate storage.
However, these instructions should be considered as
a minimum procedure to achieve the best possible
equipment life and the lowest operating cost when the
equipment is returned to service.
NOTE: Local conditions and/or experience may re-
quire ADDITIONAL procedures and/or additional stor-
age precautions.
Placing Equipment Into Storage
Perform the following instructions when preparing
General Electric equipment for storage. There are three
main equipment categories to consider:
1. When storing a truck that is operational.
2. When storing a truck that is not operational.
3. When storing major components (Motorized
Wheel, alternator, etc.).
These three major categories are the basis for deter-
mining required protective measures.
NOTE: In addition to these instructions, refer to truck
storage instructions.
When Storing A Truck That Is
Operational
When a fully operational truck is being placed into
storage for less than three months, the best protective
measure which can be taken is to drive the truck once
a week for at least 30 minutes. Prior to driving the truck,
the rotating equipment should be Meggered and:
1. If greater than 2 megohms, run normally.
2. If less than 2 megohms, isolate condition and
correct before running.
Driving the truck circulates oil in the gear case to keep
gears and bearings lubricated and free from rust. It also
prevents deterioration of the brushes, commutators
and slip rings.
When a fully operational truck is being placed into
storage for three months or longer, and the truck
cannot be operated weekly throughout the storage
period as indicated above, perform the following in-
structions:
1. Drain the oil from the gear case and install rust
preventive compound 4161 (product of Van
Straaten Chemical Co.)or equivalent. Fill per Gen-
eral Electric Motorized Wheel Service Manual.
2. Megger the wheels as indicated in the instructions
above. Operate the truck for at least 30 minutes
to insure that the rust preventive compound has
been thoroughly circulated throughout the gear
case. Stop the truck and drain the rust preventive
compound.
NOTE: Do not run a LOADED truck with rust preventive
compound in Motorized Wheel gear cases.
A07003 Storage Procedures A7-13