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Operation and Maintenance Manual
345B Excavator
Media Number -SEBU7029-04 Publication Date -01/06/2009 Date Updated -01/06/2009


i01965930

Hydraulic System Oil - Change

SMCS - 5056-044


4000 Hour Oil Change Interval

A 4000 hour maintenance interval for hydraulic oil (change) is available. The extended interval requires S·O·S monitoring of the hydraulic oil. The interval for S·O·S monitoring is every 500 hours. The maintenance interval for the hydraulic oil filter is not changed. If S·O·S monitoring is not performed, the 2000 hour maintenance interval must be used.
Machines with hammers are not included in the 4000 hour maintenance interval. Machines with hammers must use the intervals that are listed in the Maintenance Interval Schedule. Machines that are used in severe conditions are not included in the 4000 hour maintenance interval. Machines that are used in severe conditions must use the interval in the Maintenance Interval Schedule.

Lubricants

Approved hydraulic oil must be used to obtain the 4000 hour hydraulic oil change. Refer to the list that follows for approved oils.

Caterpillar Hydraulic Oils

  • Cat HYDO
  • TDTO
  • TDTO (TMS)
  • DEO
  • Biodegradable Hydraulic Oil (HEES)
  • MTO

Commercial Oils

Diesel engine oils (Heavy Duty) with a minimum zinc content of 900 ppm can be used. Acceptable commercial oils are identified by the American Petroleum Institute trademark (API). Refer to the list that follows for acceptable types of hydraulic oils.
  • CF
  • CF-4
  • CG-4
  • CH-4
Note: Industrial hydraulic oils are not recommended for the hydraulic systems of Caterpillar machines. Industrial hydraulic oils are more likely to allow corrosion and Industrial hydraulic oils are more likely to allow excessive wear.

Procedure to Change the Hydraulic Oil



Illustration 1 g00101435
  1. Park the machine on level ground. Lower the bucket to the ground so that the stick is vertical.



    Illustration 2 g00278485
    (1) Bolts
    (2) Washers (3) Cover
  1. Remove bolts (1), washers (2) and cover (3) from the top of the hydraulic tank.



    Illustration 3 g00118184
  1. Clean the area thoroughly in order to keep dirt out of the screen cover. Clean the area thoroughly in order to keep dirt out of the fill/vent plug.
  1. Relieve the internal pressure from the hydraulic tank by loosening the fill/vent plug. After the pressure is relieved, remove the fill/vent plug.



    Illustration 4 g00101446
    The oil drain valve is located under the hydraulic tank.
  1. Remove the hydraulic tank access cover that is located under the upper structure. This will allow access to the drain valve.


    Illustration 5 g00118185
    Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information that pertains to containing fluid spillage.
  1. Remove the oil drain valve plug.



    Illustration 6 g00293719
  1. Install a Swivel Hose with clear plastic tubing in order to open the drain valve. Drain the oil into a suitable container.
  1. Remove the Swivel Hose in order to close the drain valve.
  1. Inspect the O-ring. Replace the O-ring if wear or damage is evident.
  1. Clean the drain plug. Install the drain plug.


    Illustration 7 g00101449
  1. Open the access door that is located on the right side of the machine.
  1. Clean the pump, the hydraulic lines, and the hydraulic tank.



    Illustration 8 g00833606
  1. Remove the plug from the tube. Allow the oil to drain into a container. Note: Dispose of used filters and used fluids according to local regulations.
  1. Inspect the O-ring. Replace the O-ring if wear or damage is evident.
  1. Clean the plug. Install the plug and the O-ring into the drain port.



    Illustration 9 g00279621
    (4) Bolts
    (5) Washers
    (6) Cover
    (7) Spring (8) Screen
  1. Remove bolts (4), washers (5) and cover (6) . Note: Dispose of used filters and used fluids according to local regulations.
    Note: Do not allow spring (7) to fall back into the tank.
  1. Remove spring (7) and screen (8) . Note: Refer to Operation and Maintenance, "General Hazard Information" for information on containing fluid spillage.
  1. Wash the screen in a clean nonflammable solvent. Allow the screen to dry. Inspect the screen. Replace the screen, if the screen is damaged.



    Illustration 10 g00278486
    (9) O-ring seal (10) O-ring seal
  1. Inspect O-ring seals (9) and (10). Replace the O-ring seals if wear or damage is evident.
  1. Install screen (8) and spring (7). Then install cover (6), washers (5), and bolts (4) . Note: Make sure that the O-ring seals and the spring are properly positioned during installation.
  1. Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Refill Capacities".
  1. Inspect the O-ring seal on the filler plug for damage. Replace the O-ring, if necessary. Clean the filler plug. Install the filler plug.

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