247B and 257B Multi Terrain Loaders Machine Systems Caterpillar

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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.

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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak.

Charge Pump

1. Before any tests are performed, prepare the machine. Refer to Testing and Adjusting, "Machine Preparation". Before any tests are performed, visually inspect the complete hydraulic system for oil leaks and damaged parts. Refer to Testing and Adjusting, "Visual Inspection".

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Illustration 1	g00592868

2. Open the engine access door. Install tooling (A) in order to measure engine speed. Use the reflective tape that is on the pulley for the engine crankcase. Ensure proper engine operation.

3. Stop the engine. Release the system pressure before attempting any adjustment. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" for the proper procedure.

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Illustration 2	g01356939

4. Disconnect the hose assembly (1) from the fan motor inlet. Install tooling (B). Connect the flow meter inlet to the hose assembly (1). Connect the outlet of the flow meter to the fan motor inlet. The flow meter is installed in-line to the outlet of the charge pump.

   Note: Damage to the pump and damage to the hoses may result from the high pressure that is created by the flow meter valve.

   Note: The flow meter valve must be fully open before installing the flow meter in-line.

   Note: Ensure that the outlet flow from the flow meter is returned to the fan motor inlet in order to maintain charge flow to the hystat pump.

5. Route the test lines and cables in order to avoid contact with the muffler. Secure the test instruments so that the test instruments are visible during the test.

6. Fasten the seat belt. Lower the armrest.

7. Start the engine. Run the engine at HIGH IDLE.

8. The oil in the hydraulic system must be at an operating temperature of 45° ± 5°C (113° ± 9° F) throughout the test.

9. Set the pump outlet pressure to 18000 ± 1000 kPa (2611 ± 145 psi) by slowly adjusting the load valve on the flow meter.

   Note: Maintain the pump outlet pressure to 18000 ± 1000 kPa (2611 ± 145 psi) throughout the test.

10. Set the engine speed to 2000 ± 10 RPM. Ensure that engine speed is maintained throughout the test.

    Note: If necessary, readjust the pressure to 18000 ± 1000 kPa (2611 ± 145 psi).

11. Refer to 3 for the flow specification. Replace the pump if the specification is not met.

12. Unload the pump by adjusting the flow meter valve to the fully open position.

13. Stop the machine. Remove the Multitach Tool Gp (A) and the Portable Hydraulic Tester (B). Reconnect hydraulic lines.
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    Table 2

    System Requirements
    Test	Specification
    Pump Outlet Pressure	18000 ± 1000 kPa (2611 ± 145 psi)
    Engine Speed	2000 ± 10 RPM
    Oil Temperature	45° ± 5°C (113° ± 9° F)

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    Table 3

    Charge Pump
    Machine Model	Minimum Flow
    247B/ 257B	28.9 L/min (7.6 US gpm)

Work Tool Pump

1. Before any tests are performed, prepare the machine. Refer to Testing and Adjusting, "Machine Preparation". Before any tests are performed, visually inspect the complete hydraulic system for oil leaks and damaged parts. Refer to Testing and Adjusting, "Visual Inspection".

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Illustration 3	g00592868

2. Open the engine access door. Install tooling (A) in order to measure engine speed. Use the reflective tape that is on the pulley for the engine crankcase. Ensure proper engine operation.

3. Stop the engine. Release the system pressure before attempting any adjustment. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" for the proper procedure.

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Illustration 4	g01356942

4. Raise the cab. Refer to the Operation and Maintenance Manual, "Cab Support Operation" for the proper procedure. Disconnect hose assembly (1) and install tooling (B) in-line between the outlet of the work tool pump and the inlet of the control valve.

   Note: Damage to the pump and damage to the hoses may result from the high pressure that is created by the flow meter valve.

   Note: The flow meter valve must be fully open before installing the flow meter in-line.

5. Lower the cab. Route the hoses so that the cab does not rest on any of the hoses. Route the test lines and cables in order to avoid pinching the hydraulic lines when the cab is lowered. Secure the test instruments so that the test instruments are visible during the test.

6. Fasten the seat belt. Lower the armrest.

7. Start the engine. Run the engine at HIGH IDLE.

   Note: The hydraulic oil temperature rises quickly as engine starts.

8. The oil in the hydraulic system must be at an operating temperature of 50° ± 10°C (122° ± 18°F) throughout test.

9. Set the pump outlet pressure to 18000 ± 1000 kPa (2611 ± 145 psi) by slowly adjusting the load valve on the flow meter.

   Note: Maintain the pump outlet pressure to 18000 ± 1000 kPa (2611 ± 145 psi) throughout the test.

10. Set the engine speed to 2000 ± 10 rpm.

    Note: If necessary, readjust the pressure to 18000 ± 1000 kPa (2611 ± 145 psi).

11. Refer to Table 5for the flow specification. Replace the pump if the specification is not met.

12. Unload the pump by adjusting the flow meter valve to the fully open position.

13. Stop the machine. Remove the Multitach Tool Gp (A) and the Portable Hydraulic Tester (B). Reconnect hydraulic lines.
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    Table 4

    System Requirements
    Test	Specification
    Pump Outlet Pressure	18000 ± 1000 kPa (2611 ± 145 psi)
    Engine Speed	2000 ± 10 RPM
    Oil Temperature	50° ± 10°C (122° ± 18°F)

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    Table 5

    Work Tool Pump
    Machine Model	Minimum Flow
    247B/ 257B	34.2 L/min (9.0 US gpm)
    257B (1)	34.2 L/min (9.0 US gpm)

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    ( 1 )

    HF

High Flow Pump

1. Before any tests are performed, prepare the machine. Refer to Testing and Adjusting, "Machine Preparation". Before any tests are performed, visually inspect the complete hydraulic system for oil leaks and damaged parts. Refer to Testing and Adjusting, "Visual Inspection".

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Illustration 5	g00592868

2. Open the engine access door. Install tooling (A) in order to measure engine speed. Use the reflective tape that is on the pulley for the engine crankcase. Ensure proper engine operation.

3. Stop the engine. Release the system pressure before attempting any adjustment. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release" for the proper procedure.

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Illustration 6	g01356944

4. Raise the cab. Refer to the Operation and Maintenance Manual, "Cab Support Operation" for the proper procedure. Disconnect hose assembly (1) and install tooling (B) in-line between the outlet of the high flow pump and the inlet of the high flow valve.

   Note: Damage to the pump and damage to the hoses may result from the high pressure that is created by the flow meter valve.

   Note: The flow meter valve must be fully open before installing the flow meter in-line.

5. Lower the cab. Route the hoses so that the cab does not rest on any of the hoses. Route the test lines and cables in order to avoid pinching the hydraulic lines when the cab is lowered. Secure the test instruments so that the test instruments are visible during the test.

6. Fasten the seat belt. Lower the armrest.

7. Start the engine. Run the engine at HIGH IDLE.

8. The oil in the hydraulic system must be at an operating temperature of 50° ± 10°C (122° ± 18°F) throughout test.

9. Set the pump outlet pressure to 18000 ± 1000 kPa (2611 ± 145 psi) by slowly adjusting the load valve on the flow meter.

   Note: Maintain the pump outlet pressure to 18000 ± 1000 kPa (2611 ± 145 psi) throughout the test.

10. Set the engine speed to 2000 ± 10 RPM. Note: If necessary, readjust the pressure to 18000 ± 1000 kPa (2611 ± 145 psi).

    Note: If necessary, readjust the pressure to 18000 ± 1000 kPa (2611 ± 145 psi).

11. Refer to Table 7 for the flow specification. Replace the pump if the specification is not met.

12. Unload the pump by adjusting the flow meter valve to the fully open position.

13. Stop the machine. Remove test equipment and reconnect hydraulic lines.
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    Table 6

    System Requirements
    Test	Specification
    Pump Outlet Pressure	18000 ± 1000 kPa (2611 ± 145 psi)
    Engine Speed	2000 ± 10 RPM
    Oil Temperature	50° ± 10°C (122° ± 18°F)

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    Table 7

    High Flow Pump
    Machine Model	Minimum Flow
    257B (1)	23.7 L/min (6.3 US gpm)

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    ( 1 )

    HF