M316C, M318C and M322C Excavators and M318C and M322C Material Handlers Hydraulic System Oil - Change Caterpillar

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.

AVSpare 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 AVSpare machines. Industrial hydraulic oils are more likely to allow corrosion and Industrial hydraulic oils are more likely to allow excessive wear.

Drain the Oil

1. Operate the machine for an adequate period of time in order to warm the oil.

2. Park the machine on a level surface.

3. Engage the parking brake.

4. Lower the implements to the ground with the stick in a vertical position, as shown.

5. Stop the engine.

6. Open the left front access door. Secure the access door.

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Bodily injury can occur from unexpected contact with open cab doors on machines equipped with a fixed cab riser. To avoid injury, close the cab door before climbing onto the rear of the machine.

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Illustration 1	g00803528

Note: In order to loosen the breather, a clip must be attached to the breather. The clip is located in the literature compartment with the machines Operation and Maintenance Manual.

7. Slowly loosen the breather in order to relieve system pressure.

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Illustration 2	g00803527
The drain valve is under the middle of the machine.

Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information in containing fluid spillage.

8. Remove the cap at the bottom of the drain valve.

9. Install a drain hose in order to drain the hydraulic tank. Open the drain valve. Allow the oil to drain into a suitable container.

   Note: Dispose of drained fluids according to local regulations.

10. Close the drain valve and remove the drain hose. Install the cap at the drain valve.

11. Tighten the breather in Step 7.

Service the Hydraulic System Filters

Note: The pressure must be removed from the hydraulic oil system before the filter can be serviced. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".

Refer to the following topics in order to service the hydraulic system filters:

• Operation and Maintenance Manual, "Hydraulic System Oil Filter - Clean (Return In-line Filter)"

• Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace (Hydraulic Demand Fan In-Line Filter)"

• Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace (Hydraulic Swing Circuit Filter)"

• Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace (Pilot Filter)"

• Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace (Return Filter)"

Note: All machines have all these filters.

Fill the Hydraulic Tank

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Illustration 3	g00803530

1. Remove the filler plug from the hydraulic tank.

2. Fill the hydraulic oil tank. See Operation and Maintenance Manual, "Capacities (Refill)".

3. Clean the filler plug. Inspect the O-ring seal. Replace the O-ring seal if the seal is worn or damaged.

4. Install the filler plug.

5. Start the engine. Operate the engine at idling speed for a few minutes.

6. Operate the control levers in order to allow the hydraulic oil to circulate through all hydraulic circuits.

   Note: Air may become trapped in the hydraulic system. The pump may cavitate or the machine may move in jerks for several seconds. If these symptoms continue then air is trapped in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" for instructions on releasing the air.

7. Lower the work tool to the ground. The stick should be vertical.

8. Stop the engine.

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Illustration 4	g00803536
The sight gauge is located in the engine compartment on the right side of the machine.

9. The sight gauge contains three red rings for level markers. Maintain the oil level to the middle ring on the sight gauge.

10. Close all access doors.