MAINTENANCE
3-2 WB140-2N, WB150-2N
GUIDE TO MAINTENANCE
• Before opening the engine hood, engage safety locks of both the front loader and backhoe.
• If it is necessary to check the hydraulic oil level in the reservoir, arrange the machine in the transport position. See
“SAFETY LOCK USAGE” on page 2-44.
• Only perform operations on firm and level ground, after applying the parking brake.
• Use Komatsu genuine oils and greases; choose oils suitable for the ambient temperature.
• Use clean oils and greases. Keep the oil and grease containers clean. Keep any foreign matter away from oils and greases.
• Always keep the machine clean. This makes it easier to locate any part causing problems. Keep the grease fittings, the
breathers and the areas near the openings for the fluid level checks clean and prevent any impurities from getting into/on
them.
• Draining hot oil or coolant immediately after stopping the engine is hazardous. Wait for the engine to cool down to at least
40-50°C (104-122° F) before draining hot liquids.
• After changing the oil or the filters, check if metal particles are present. If you find large quantities of metal particles, con-
tact your Komatsu Dealer.
• Check and change the oil in clean locations and prevent any impurities from getting into the tank/container.
• Before carrying out any maintenance operation, hang the warning plates on the ignition switch, control levers, and cab
doors, to prevent anyone from starting the engine by mistake.
• When performing maintenance operations, always take the precautions indicated on safety plates applied on the machine.
• Instructions for are welding.
1. Turn ignition key to the “OFF” position.
2. Disconnect the battery (first negative pole and then positive pole).
3. Disconnect the alternator.
4. Do not apply more than 200V continuously.
5. Connect the ground cable within 1 mm (0.039 inch) from the point on which welding will take place.
6. Avoid placing gaskets and bearings between the welding area and ground cable.
• Do not use flammable fluids to clean machine parts. Keep exposed flames and lit cigarettes away from these fluids.
• When o-rings and gaskets are removed, thoroughly clean sealing surfaces and replace all o-rings and gaskets with new
ones. Fit the o-rings and gaskets correctly when reassembling.
• Avoid keeping loose objects or tools in your pockets: they may fall out and drop into the machine, especially when you
open covers and work on the machine while bending over it.
• When washing the machine, do not direct high-pressure water jet onto the radiator and heat exchanger.
• When washing the machine, protect electric system connectors and avoid getting the ignition switch wet.
• Before starting work in mud, in rain, on seashores, or river banks perform general lubrication. Wash the machine immedi-
ately after work to protect components from rust. Lubricate equipment joints more frequently than usual.
• When working at dusty work sites, proceed as follows:
1. Check the air cleaner for any clogging and clean it more frequently than usual.
2. Clean the radiator and the heat exchanger frequently, to avoid any clogging of the fins.
3. Change the diesel oil filter more frequently than usual.
4. Clean the electrical components, especially the starter and the alternator, to avoid any accumulation of dust.
• Never mix oils of different brands.
• Do not top off with any oil different from oil used in the machine. If necessary, drain all the oil and fill tank with new dif-
ferent brand oil.
• Oils, filters, coolant, and the battery are considered special waste and must be collected and disposed
of according to the regulations in force.
• Combustible material of some components may become extremely dangerous if it burns. For this rea-
son, avoid any contact of burnt material with your skin or eyes and do not inhale fumes.
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