OM4064 06/11 Maintenance - Section 40 Lubrication and Service Page 40-1 LUBRICATION AND SERVICE GENERAL INFORMATION HYDRAULIC TANK SERVICE The recommended preventive maintenance will con- tribute to the long life and dependability of the truck and its components. The use of proper lubricants and the performance of checks and adjustments at recom- mended intervals is most important. There are two sight gauges on the side of the hydraulic tank. With the engine stopped, key switch OFF, hydrau- lic system bled down and body down, oil should be vis- ible in the top sight gauge. If hydraulic oil is not visible in the top sight gauge, follow Adding Oil instructions below.
Lubrication requirements are referenced to the lube key found in the Lubrication chart in this section. For detailed service requirements for specific components, refer to the shop manual. Adding Oil Keep the system open to the atmosphere only as long as absolutely necessary to lessen the chances of sys- tem contamination. Refer to the manufacturer's service manual when ser- vicing any components of the General Electric system. Refer to the engine manufacturer's service manual when servicing the engine or any of its components. Service the tank with clean Type C-4 hydraulic oil only. All oil being put into the hydraulic tank must be filtered through filters rated at three microns. 1.
Ensure that the engine is stopped, key switch is OFF, hydraulic accumulators depressurized, and body is down. 2. Remove fill cap (2, Figure 40-1) and add hydraulic oil until the oil level is visible in the center of the top sight gauge. 3. Install the fill cap. 4. Start the engine. Raise and lower the dump body three times. 5. Check the hydraulic oil level again with the engine stopped, key switch OFF, hydraulic accumulators depressurized, and body down. The service intervals presented here are in hours of operation. These intervals are recommended as a sub- stitute for an oil analysis program, which may deter- mine different intervals.
However, if the truck is being operated in extreme conditions, some, or all of the intervals, may need to be shortened and the service performed more frequently. 6. Repeat Steps 1 - 5 until the oil level is maintained in the center of the top sight gauge. Komatsu trucks are equipped with an automatic lubri- cation system. The system is designed to automatically deliver the proper amount of lubricant to a specified lubrication point such as a steering cylinder pin or body pivot pin. This system uses lubrication injectors, one for each lubrication point, which can be adjusted to supply the precise amount of lubricant to each specific lubrica- tion point.
A timer is also designed into the system to activate the lube pump on a preset interval. This time interval is adjustable, depending on the requirements for lubrication. For additional information on the sys- tem, refer to Automatic Lubrication System in this man- ual. FIGURE 40-1. HYDRAULIC TANK SERVICE 1. Sight Gauges 2. Fill Cap 730E SERVICE CAPACITIES Crankcase (including lube oil filters) Liters US Gallons 223 59 Cooling System 409 108 Hydraulic System 731 193 Wheel Motor Gear Box (each side) 40 10.5 Fuel Tank (diesel fuel only) 3 217 850