Preparations For Work; Precautions During Work - Komatsu PC390LC-10 Shop Manual

FOREWORD

Preparations For Work

1. Before adding oil or making repairs, park the machine on hard, level ground, and block the wheels or tracks to prevent the
machine from moving.
2. Before starting work, lower blade, ripper, bucket or any other work equipment to the ground. If this is not
possible, insert the safety pin or use blocks to prevent the work equipment from falling. In addition, be sure to lock all the
control levers and hang warning signs on them.
3. When disassembling or assembling, support the machine with blocks, jacks or stands before starting work.
4. Remove all mud and oil from the steps or other places used to get on and off the machine. Always use the handrails, lad-
ders or steps when getting on or off the machine. Never jump on or off the machine. If it is impossible to use the handrails,
ladders or steps, use a stand to provide safe footing.

Precautions During Work

1. When removing oil filler cap, drain plug or hydraulic pressure measuring plugs, loosen them slowly to prevent the oil
from spurting out. Before disconnecting or removing components of the oil, coolant or air circuits, first remove the pres-
sure completely from the circuit.
2. The coolant and oil in the circuits are hot when the engine is stopped, so be careful not to get burned. Wait for the oil and
coolant to cool before performing any work on the oil or coolant circuits.
3. Before starting work, shut down the engine. When working on or around a rotating part, in particular, shut down the
engine. When checking the machine without stopping the engine (measuring oil pressure, revolving speed, temperature,
etc.) take extreme care not to get rolled or caught in rotating or moving parts.
4. For the machine equipped with a battery disconnect switch, before starting the work, check that the system operating lamp
is turned OFF, and then turn the battery disconnect switch to the OFF (o) position and pull the switch key out. For
machines with a battery disconnect switch, before starting the work, remove the leads from the battery. ALWAYS remove
the lead from the negative (-) terminal first.
5. When raising heavy components, use a hoist or crane. Check that the wire rope, chains and hooks are free from damage.
Always use lifting equipment which has ample capacity. Install the lifting equipment at the correct places. Use a hoist or
crane and operate slowly to prevent the component from hitting any other part. Do not work with any part still raised by
the hoist or crane.
6. When removing covers which are under internal pressure or under pressure from a spring, always leave two bolts in
position on opposite sides. Slowly release the pressure, then slowly loosen the bolts to remove.
7. When removing components, be careful not to break or damage the wiring. Damaged wiring may cause electrical fires.
8. When removing piping, stop the fuel or oil from spilling out. If any fuel or oil drips on to the floor, wipe it up immediately.
Fuel or oil on the floor can cause you to slip, or can even start fires.
9. Never use flammable liquids to clean parts, use only non-flammable approved cleaning solutions to clean parts.
10. Be sure to assemble all parts again in their original places. Replace any damaged part with new parts.
• When installing hoses and wires, be sure that they will not be damaged by contact with other parts when the machine
is being operated.
11. When installing high pressure hoses, make sure that they are not twisted. Damaged tubes are dangerous, so be extremely
careful when installing tubes for high pressure circuits. Also check that connecting parts are correctly installed.
12. When assembling or installing parts, always use the specified tightening torques. When installing protective parts such as
guards, or parts which vibrate violently or rotate at high speed, be particularly careful to check that they are installed
correctly.
PC360/390LC-10
SAFETY
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