Komatsu PC88MR-10 Shop Manual page 16

00 Index and foreword
Foreword, safety and general information
jump on or off the machine. When the scaffold is
not provided, use steps or stepladder to secure
your footing.
Precautions during work
For the machine equipped with the battery
disconnect switch, check that the system
operating lamp is turned off before starting the
work. Then, turn the battery disconnect switch to
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.
Release the remaining pressure in the circuits
completely before the work when the parts in the
circuits of oil, fuel, coolant and air are
disconnected 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.
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.
Immediately after the engine is shut down, the
coolant and oil in the circuits are hot. Be careful
not to get scalded by the hot coolant and oil.
Start the work after checking that the coolant
and oil are cooled down sufficiently.
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, rotational speed,
oil or coolant temperature), take extreme care
not to get caught in the rotating parts or the
working equipment.
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.
When removing the part which is under internal
pressure or reaction force of the spring, always
leave 2 bolts in diagonal positions. Loosen those
2 bolts gradually and alternately and release the
pressure, then, remove the part.
When removing the part, be careful not to break
or damage the electrical wiring. The damaged
wiring may cause electrical fires.
When removing piping, prevent the fuel or oil
from spilling out. If any fuel or oil drips onto the
00-14
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
parts. Do not use gasoline to clean the electrical
parts, in particular.
Reinstall the parts removed to their original
places. Replace the damaged parts and the
parts which must not be used with new ones.
When installing the hoses and wiring harnesses,
be careful that they are not damaged by
contacting with other parts when the machine is
operated.
When connecting the high pressure hoses and
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 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.
When aligning 2 holes, never insert your fingers
or hand into the holes. Align the holes with care
so that your fingers are not caught in the hole.
When measuring hydraulic pressure, check that
the measuring tools are correctly installed.
Pay attention to safety when removing and
installing the tracks of the track type machines.
When removing the track, it separates suddenly.
The workers should not stand at either end of
the track.
If the engine is operated for a long time in a
closed place which is not ventilated well, you
may suffer from gas poisoning. Accordingly,
open the windows and doors to ventilate the
place well.
Precautions for slinging work and making
signals
Only one appointed worker must make signals
and co-worker must communicate with each
other frequently. The appointed signaler must
make specified signals clearly at the place
where the signaler is well seen from the
operator's seat and where the signaler can see
the working condition easily. The signaler must
always stand in front of the load and guide the
operator safely.
1. Do not stand under the load.
2. Do not step on the load.
Check the slings before starting sling work.
Keep putting on the gloves during sling work.
(Put on the leather gloves, if available.)
PC88MR-10