C175 Generator Sets Caterpillar

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Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

The oil change interval will be affected by the following items:

• Engine application

• Size of the oil sump

• Fuel type

• Oil type

• Ambient air conditions

• Air/fuel ratio

The S·O·S oil analysis program analyzes used oil to determine if the oil change interval is suitable for your specific engine.

Drain the Engine Oil

Do not drain the oil when the engine is cold. As the oil cools, suspended waste particles settle on the bottom of the oil pan. The waste particles are not removed when the cold oil is drained. Drain the crankcase when the oil is warm. This draining method allows the waste particles that are suspended in the oil to be drained properly.

Failure to follow this recommended procedure will allow the waste particles to be recirculated through the engine lubrication system with the new oil.

1. After the engine has been operated at normal operating temperature, STOP the engine.

2. Drain the oil according to the equipment on the engine.

   Note: The threads that are provided on the drain valve are metric. Drain the oil into a suitable container. Dispose of the oil according to local regulations.

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   Illustration 1	g01245813
   (1) Oil drain valve (2) Oil drain plug

   1. Open oil drain valve (1). Oil drain plug (2) may also be used to drain the oil. After the oil has drained, close the oil drain and/or reinstall the drain plug.

   2. If a suction device is inserted into the oil pan, ensure that the suction device is clean. The suction device will prevent dirt from entering into the oil pan. Be careful not to strike the engine oil suction tubes or the piston cooling jets.

   3. If a suction device that attaches to the oil drain is used, ensure that the suction device is clean. Attach the suction device to the oil drain. Open the oil drain. After the oil has drained, close the oil drain and remove the suction device.

Replace the Oil Filter Elements

Replace the engine oil filters when either of the following conditions are met:

• Every oil change

• The engine oil filter differential pressure reaches 103 kPa (15 psi).

Service tools are available to aid in the service of oil filters. Consult your Cat dealer for the part names and the part numbers. Follow the instructions that are supplied with the service tools. If the service tools are not used, perform the following appropriate procedure.

Replacing the Engine Oil Filters With the Engine Stopped

Illustration 2	g01245867
(1) Bolts (2) Cover (3) Drain valve

Note: Drain the oil into a suitable container. Dispose of the oil according to local regulations.

1. Connect a hose to drain valve (3). Place the other end of the hose into a suitable container to collect the oil.

2. Open drain valve (3). Allow the oil to drain. Clean the plug and install the plug. Close the drain valve. Remove the hose from the drain.
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   Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened.

   Note: Some oil will remain in the housing after the oil has been drained. This oil will pour out of the housing when cover (2) is removed. Prepare to catch the oil in a suitable container. Clean up any spilled oil with rags. DO NOT use absorbent particles to clean up the oil.

3. Be alert to the spring force. Gradually loosen but do not remove bolts (1). Before removing bolts (1), pry the cover (2) loose to relieve any spring pressure. Remove cover (2). Remove the O-ring seal on theinside thecover.

4. Clean cover (2) and clean the O-ring seal. Clean the inside the oil filter housing.
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   NOTICE
   Caterpillar oil filters are built to Caterpillar specifications. Use of an oil filter not recommended by Caterpillar could result in severe engine damage to the engine bearings, crankshaft, etc., as a result of the larger waste particles from unfiltered oil entering the engine lubricating system. Only use oil filters recommended by Caterpillar.

5. Install new oil filter elements.

6. Inspect the O-ring seal. Ensure that the surfaces for the O-ring seal are clean. Install a new O-ring seal if the old O-ring seal is damaged or deteriorated.

7. Install cover (2). Ensure that the springs are seated properly between the cover and the oil filter elements.

Replace the Oil Filter Elements During Engine Operation

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Filter contains hot pressurized fluid when engine is running. Follow instructions on control valve to avoid personal injury. If rapid air movement exists to blow fluid, Stop the engine to avoid fire.

If replacing the oil filters during engine operation is necessary, perform the following procedure.

Illustration 3	g03363287
(1) Control valve (2) Drain (3) Cover (4) Pressure gauge

Illustration 4	g03363311

1. Connect a drain tray to the drain valve (2). Use a suitable container to catch the used oil.
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   Illustration 5	g03363303

2. Rotate control valve (1) to the "LOWER SERVICE" position.

3. Open drain valve (2) and drain the lower oil filter housing.

4. Observe pressure gauge (4) until the pressure is "0".
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   Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened.

   Note: DO NOT use absorbent particles to clean up the oil.

5. Some oil will remain in the housing after the oil has been drained. Prepare to catch the oil in a suitable container. Clean up any spilled oil with rags. Be alert to the spring force. The cover has a spring (7) with a force up to 240 N (54 lb). Gradually loosen but do not remove the last two bolts (5) or nuts that are at opposite ends of cover (3). Before removing the last two bolts, pry the cover loose or tap the cover with a rubber mallet to relieve any spring pressure.

6. Gradually remove cover and O-ring seal (6).

7. Remove spring (7) and retainer (8).

8. Elements (10) are mounted on wire rack (9) inside the housing. Use a pan to catch the oil that drips when wire rack is removed. Remove wire rack. Remove used elements (10). Clean up any oil that is spilled.
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   NOTICE
   Caterpillar oil filters are built to Caterpillar specifications. Use of an oil filter not recommended by Caterpillar could result in severe engine damage to the engine bearings, crankshaft, etc., as a result of the larger waste particles from unfiltered oil entering the engine lubricating system. Only use oil filters recommended by Caterpillar.

9. Ensure that the new oil filter elements are in good condition. Place the elements on wire rack . Install the wire rack and the elements.

10. Ensure that the surfaces for O-ring seal (6) are clean. Inspect the O-ring seal. If the old O-ring seal is damaged or deteriorated, replace the old O-ring seal with a new O-ring seal. Install the O-ring seal.

11. Install cover (3). Ensure that the spring is seated properly between retainer (8) and cover (3). Close drain valve (2).

12. Rotate control valve (1) to the "LOWER FILL" position. Observe pressure gauge (4). Check cover (3) for leaks.

    Note: A hydraulic stop will limit the rotation of the control valve until the oil filter housing is full of oil.

13. After the pressures of the lower oil filter and the upper oil filter are equal, rotate control valve (1) to the "UPPER SERVICE" position. Repeat Step 1 through Step 12 for the upper oil filter.

14. After the oil filters have been serviced and after the pressure of the lower oil filter and the upper oil filter are equal, rotate control valve (1) to the "RUN" position.

Fill the Crankcase

Use the following procedure to fill the crankcase if the engine oil filters were replaced with the engine stopped.

1. Remove the oil filler cap. Fill the crankcase through the oil filler tube only. For the amount of oil to use, see this Operation and Maintenance Manual, "Refill Capacities and Recommendations" topic (Maintenance Section). Clean the oil filler cap. Install the oil filler cap.
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   NOTICE
   To prevent engine damage, crank engine with fuel off to fill all filters before starting. Do Not crank engine for more than 30 seconds.

2. Close the fuel supply line and crank the engine until the oil pressure gauge indicates 70 kPa (10 psi). Open the fuel supply line. Allow the starting motor to cool for 2 minutes before cranking again.

3. Start the engine according to this Operation and Maintenance Manual, "Starting The Engine" procedure (Operation Section). Operate the engine at low idle for 2 minutes. This process will ensure that the lubrication system has oil and that the oil filters are filled with oil. Inspect the engine for oil leaks. Ensure that the oil level is at the "FULL" mark on the "LOW IDLE" side of the oil level gauge.

4. Stop the engine and allow the oil to drain back into the sump for a minimum of 10 minutes.

5. Remove the oil level gauge and check the oil level. Maintain the oil level to the "FULL" mark on the "ENGINE STOPPED" side of the oil level gauge.

Inspect the Used Oil Filter Elements

Cut the used oil filter element open with a utility knife. Remove the metal wrap. Cut the filter element free from the end caps. Spread apart the pleats and inspect the element for metal debris. An excessive amount of debris in the element may indicate early wear or a pending failure.

Use a magnet to differentiate between the ferrous metals and the nonferrous metals that are found in the element. Ferrous metals may indicate wear on the steel and the cast iron parts of the engine. Nonferrous metals may indicate wear on the aluminum parts, the brass parts, or the bronze parts of the engine. Parts that may be affected include the following components: main bearings, rod bearings, turbocharger bearings, and cylinder heads.

Due to normal wear and friction, small amounts of debris may be found in the oil filter element. If an excessive amount of debris is found in the oil filter element, consult your Caterpillar dealer to arrange for further oil analysis.

Drain the Fuel Injection Pump Oil (Wet-Sump Pump)

Note: Perform the following procedure at the same interval as the engine oil and filter change.

Illustration 6	g02163539
(1) Oil drain plug (2) Oil fill plug

1. Remove the oil fill plug (2).

   Note: An oil fill plug is on each side of the fuel injection pump housing.

2. Remove the oil drain plug (1). Allow the oil to drain into a suitable container.

3. Clean and reinstall the oil drain plug.

4. Utilizing a hand priming pump, fill the pump with oil. For the correct type and amount of oil to use, refer to this Operation and Maintenance Manual (Maintenance Section), "Refill Capacities and Recommendations".

5. Clean and reinstall the oil fill plug.

Magnetic Plug - Check

Use the following procedure to check the magnetic plug of the high-pressure fuel pump.

Illustration 7	g03123238

Illustration 8	g03126736

Prepare the machine for maintenance. Refer to Operation and Maintenance Manual, "Prepare the Machine for Maintenance".

During the recommended engine oil change interval, check the adapter and high-pressure fuel pump Magnetic Plugs (1) for ferrous material. Excessive quantities of ferrous material are an indicator that premature wear is occurring and action is required.

Note: If debris is found on the magnetic plug, try to obtain the material to determine location on pump if returned. Disassembly of pump is not recommended. Consult with your Cat dealer.

Note: Do not disassemble the high-pressure fuel pump. The pump contains springs that are under pressure. There are no serviceable parts internal to the high-pressure pump. Disassembly of the pump is discouraged. Consult with your Cat dealer.