Komatsu PC118MR-8, Operation And Maintenance Manual

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GUIDE TO MAINTENANCE
MAINTENANCE
4-10
NOTES ON THE MAINTENANCE OF THE HYDRAULIC SYSTEM 4
q
Be extremely careful when performing maintenance operations on the hydraulic system, since soon after work
the oil is very hot. The circuit is pressurized not only during work, but also at the end of work.
q
The maintenance operations required for the hydraulic system are the following:
Q
Daily check of the oil level in the tank.
Q
Periodical change of the oil filter.
Q
Periodical change of the oil and cleaning of the intake filter.
q
Always bleed the circuit after changing the oil filter or the oil.
q
When a component is removed from the circuit, check the gaskets and O rings and change them if they are
damaged.
q
When a cylinder or a component of the hydraulic circuit is removed, after reassembly bleed the circuit by
proceeding as follows:
Q
Start the engine and let it idle.
Q
Extend all cylinders 4-5 times, stopping them at approx. 100 mm from the end of stroke.
Q
Slowly make all cylinders reach the end of stroke for 3-4 times.
MAINTENANCE NOTES REGARDING LUBRICATION 4
q
Lubrication makes the operations carried out with the machine and work equipment smoother, while
preventing wear and the noise that may be produced if the joints are dry.

Lubricate with grease or oil.
q
The maintenance operations required for the components that need lubricating are the following:
Q
Check of the levels.
Q
Oil change.
Q
Injection of grease through the grease nipples.
q
Use only the specified lubricants, according to the ambient temperature.
q
Always clean the grease nipples before injecting grease and remove any excess grease after lubrication; this
cleaning operation must be performed with extreme care on the revolving parts.
q
Maintain correct lubricant levels, avoiding excessive or insufficient quantities.
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