Handle Hydraulic Components - Komatsu D37EX-24 Operation & Maintenance Manual

MAINTENANCE
• When removing the connectors of electrical components after washing the machine or in the rain, wipe off
the water drop stuck around connectors before removing the connectors and keep the water drop away
from inside of the connectors.
• Checking and maintenance items are checking fan belt tension, checking damage of the fan belt and
checking battery fluid level.
• Komatsu recommends installing electric components specified by Komatsu.
• External electro-magnetic interference may cause malfunction of the control system controller. Accordingly,
consult your Komatsu distributor before installing a radio receiver or other wireless equipment to the ma-
chine.
• When working at the seashore, keep the electrical component clean to prevent corrosion.
• When installing electrical component, connect it to the special power supply connector.
Do not connect the optional power supply to the fuse or starting switch or battery relay, etc.

HANDLE HYDRAULIC COMPONENTS

• The hydraulic system is at high temperature during and just after operation. In addition, high pressure is
applied to the hydraulic system, thus pay attention to the following matters when performing inspection and
maintenance of it.
• Lower the work equipment to the ground on a level place, and work so that no pressure is applied to
the cylinder circuits.
• Be sure to stop the engine.
• Since the hydraulic oil and lubricating oil are at high temperature and high pressure just after operation,
wait until the oil temperature at each part decreases, and then start maintenance.
Internal pressure may be high even after the temperature decreases.
When loosening a plug, screw, or hose, avoid standing in front of them and loosen gradually and re-
lease the internal pressure, and then remove.
• When performing inspection and maintenance of the hydraulic circuit, be sure to release air from the
hydraulic tank to release the internal pressure.
• The inspection and maintenance include check of the hydraulic oil level, replacement of filters, replacement
of the hydraulic oil.
• When the high-pressure hoses, etc. are disconnected, check the O-rings for damage. If they are damaged,
replace them.
• When the hydraulic oil filter element or strainer is replaced or cleaned, or when a hydraulic component is
repaired, replaced, or its piping is removed, air in the circuit must be bled.
• The accumulator is charged with high-pressure nitrogen gas, and it is extremely dangerous if it is handled
incorrectly.
OUTLINE OF MAINTENANCE
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