Komatsu PC200-8M0 Shop Manual page 19

200 Foreword and general information
Foreword, safety and general information
When performing the disassembling or assem-
q
bling work, support the machine securely with
blocks, jacks, or stands before starting the
work.
q Remove all of mud and oil from the steps or
other places used to get on and off the
machine completely. Always use the handrails,
ladders of steps when getting on or off the
machine. Never jump on or off the machine.
When the scaffold is not provided, use steps or
stepladder to secure your footing.
Precautions during work
q For the machine equipped with the battery dis-
connect switch, check that the system operat-
ing lamp is turned off before starting the work.
Then, turn the battery disconnect switch to the
OFF (Q) position and remove the switch key.
For the machine not equipped with the battery
disconnect switch, remove the cable from the
battery before starting the work. Be sure to
remove the negative end (-) of the battery
cable first.
q Release the remaining pressure in the circuits
completely before the work when the parts in
the circuits of oil, fuel, coolant and air are dis-
connected or removed. When the cap of the oil
filter, drain plug or oil pressure pickup plug is
removed, loose them slowly to prevent the oil
from spurting out.
q When removing or installing the checking plug
or the piping in the fuel circuit, wait 30 seconds
or longer after the engine is shut down and
start the work after the remaining pressure is
released from the fuel circuit.
q Immediately after the engine is shut down, the
coolant and oil in the circuits are hot. Be care-
ful not to get scalded by the hot coolant and oil.
Start the work after checking that the coolant
and oil are cooled down sufficiently.
q Start the work after the engine is shut down. Be
sure to shut down the engine when working on
or around the rotating parts in particular. When
checking the machine without shutting down
the engine (measuring oil pressure, engine
speed, oil or coolant temperature), take
extreme care not to get caught in the rotating
parts or the working equipment.
q The hoist or crane must be used to sling the
components weighing 25 kg or heavier. Check
the slings (wire rope, nylon sling, chain and
hook) for damage before the work. Use the
slings with ample capacity and install them to
the proper places. Operate the hoist or crane
slowly to prevent the component from hitting
any other part. Do not work with any part still
raised by the hoist or crane.
PC200, 200LC, 220, 220LC-8M0
When removing the part which is under internal
q
pressure or reaction force of the spring, always
leave two bolts in diagonal positions. Loosen
those two bolts gradually and alternately and
release the pressure, then, remove the part.
q When removing the part, be careful not to
break or damage the electrical wiring. The
damaged wiring may cause electrical fires.
q When removing piping, prevent the fuel or oil
from spilling out. If any fuel or oil drips onto the
floor, wipe it off immediately. Fuel or oil on the
floor can cause you to slip and can even cause
fires.
As a general rule, do not use gasoline to wash
q
parts. Do not use gasoline to clean the electri-
cal parts, in particular.
Reinstall the parts removed to their original
q
places. Replace the damaged parts and the
parts which must not be used with new ones.
When installing the hoses and wiring har-
nesses, be careful that they are not damaged
by contacting with other parts when the
machine is operated.
When connecting the high pressure hoses and
q
tubes, make sure that they are not twisted. The
damaged high pressure hoses and tubes are
very dangerous when they are installed. So, be
extremely careful when connecting the high
pressure pipings. In addition, check that their
connections are correct.
When assembling or installing the parts, be
q
sure to tighten the bolts to the specified torque.
When installing the protective parts such as
guards, or the parts which vibrate violently or
rotate at high speeds, be sure to check that
they are installed correctly.
q When aligning two holes, never insert your fin-
gers or hand into the holes. Align the holes
with care so that your fingers are not caught in
the hole.
q When measuring hydraulic pressure, check
that the measuring tools are correctly installed.
q Pay attention to safety when removing and
installing the tracks of the track type machines.
When removing the track, it separates sud-
denly. The workers should not stand at either
end of the track.
If the engine is operated for a long time in a
q
closed place which is not ventilated well, you
may suffer from gas poisoning. Accordingly,
open the windows and doors to ventilate the
place well.
SEN06112-00
3
00-200