08LAB

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Quiz & Tests

MALAGA

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PRE/POST TEST

2 Page:

320B/330B HYDRAULIC EXCAVATORS

1. Excavator pumps are destroked to meet the demands of a

sudden load increase to prevent the engine from being lugged by the:

a) Pilot relief valve

b) Combiner and main relief valve c) PRV valve

d) Crossover valve e) Servo valves

2. A low pilot system pressure or a worn pilot pump will show up as:

a) Excessive engine lugging b) Excessive engine smoke c) Brakes not releasing d) Slow implements

3. The purpose of the underspeed control is to:

a) Decrease signal pressure so pumps will decrease output b) Increase signal pressure so pumps will decrease output c) Decrease signal pressure so pumps will increase output d) Increase signal pressure so pumps will increase output .

4. The purpose of the track brake valves on the track motors are to prevent motors from freewheeling on a downhill situation by:

a) Providing a restriction on the pressure side of valve b) Providing a restriction in the return circuit

c) Moving the track brake valve to engage automatically d) All of the above

5. The underspeed control system is part of the:

a) Track motor hydraulic circuit b) Pilot system circuit

c) Track brake circuit d) Electronic control system

6. The valve that provides signal pressure to destroke the main pumps is called:

a) Boom vent valve b) Overspeed valve c) Underspeed valve

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7. The hydraulic lock lever prevents implement movement in the safe position by:

a) Venting the pilot relief valve and dumping oil b) Return pilot pump flow back to the tank c) Blocking pilot flow to the pilot control valves

d) Reducing pilot pressure to a valve less than 700 kPa

8. An operator complains of very slow bucket and boom cylinder speeds. After checking cycle times, you agree speeds are too slow. Which of the following could be the cause:

a) High pilot pressure

b) Lower pump defective adjustment c) Low PS signal pressure

d) Defective boom line relief valve

9. An operator complains he cannot swing. The most probable cause could be a defective:

a) Main swing relief valve b) Left swing line relief valve c) Swing brake solenoid d) Right swing line relief

10. On all “B” series excavators all line relief valves are set:

a) Higher than main relief valve pressures b) Same as main relief valve pressures

c) 700 kPa lower than main relief valve pressures d) 700 kPa higher than main relief pressures

11. The main system oil filters are placed in the system between:

a) Pump and swing control valve

b) Pilot manifold and pilot control valves c) Main control valves and oil cooler d) Oil cooler and hydraulic tank

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4 Page:

12. Protection for the boom structure due to some downward external force is provided by the:

a) Line relief valve on the boom spool housing b) Boom anti-drift check valve

c) Main system relief valve

d) Line relief valve in the boom drift reduction valve housing

13. The NFC screw when adjusted counterclockwise too far can cause pumps to go toward:

a) Minimum angle and increase engine speed by more than 10 rpm b) Maximum angle and decrease engine speed by more than 10 rpm c) NFC screw will never need to be adjusted

d) Causing engine to go into lug

14. On 300B serie, when adjusting the implement pump destroking pressure :

a) Adjust the power screw in to raise the PS pressure and low the destroking pressure b) Adjust the power screw out to raise the implement pump destroking pressure c) Adjust the NFC screw in to raise the implement pump destroking pressure d) None of the above

15 . When PS pressure to the implement pump regulator increases:

a) The pump upstroke and engine rpm decreases b) The pump upstroke and the engine rpm increases c) The pump destroke and the engine rpm decreases d) The pump destroke and the engine rpm increses

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LAB EXERCISES

PRODUCT DESCRIPTION

Given a machine, the appropriate service literature, and the 19 and 20 Worksheets pages,

- Perform step by step the customer configuration setting through the User Mode - Perform the clock adjustment

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LAB EXERCISES

6 Page:

Test and Adjust Implement pump Destroking Pressure

Machine Model____________________________ Date__________________________________ Serial Number_____________________________ Service Meter Hours_____________________

IMPLEMENT / TRAVEL PUMPS DESTROKING PRESSURES

PUMP POSITION

UPPER PUMP

LOWER PUMP

SPECIFICATION ACTUAL PS PRESSURE

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PUMP & PUMP CONTROLS

LAB EXERCISES

Test and Adjust Negatif Flow Control (NFC)

NEGATIF FLOW CONTROL ADJUSTMENT

PUMP POSITION

UPPER PUMP

LOWER PUMP

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LAB EXERCISES

8 Page:

PILOT SYSTEM

Test and Adjust Pilot System Relief Valves

PRESSURE TESTS

TESTS

Pilot system pressure (w/engine at high idle)

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LAB EXERCISES

IMPLEMENT & TRAVEL SYSTEM

Test and Adjust Implement & Travel System Relief Valves

PRESSURE TESTS

TESTS

Implement system pressure (w/engine at high idle)

Travel System Pressure (w/engine at high idle)

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10 Page:

LAB EXERCISES

IMPLEMENT & TRAVEL SYSTEM

Test and Adjust Tow Speed Track Automatic Change Pressure

PRESSURE TESTS

TESTS

Travel system pressure (w/engine at high idle)

Pilot signal Pressure (w/engine at high idle)

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LAB EXERCISES

INSTRUMENT PANEL

- Access the Service Mode by using the proper security code,

- Explore the list of each group classification parameter values, that includes PRV and Governor calibrations.

- Test the Electronic Control System using the onboard diagnostic capabilities,

Given a machine, the appropriate service literature, class notes (Instrument Panel chapter) and tools:

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12 Page:

CASE STUDY

POST TEST

325B Hydraulic Excavator Case Study

You may use the appropriate service literature and class notes to complete the case study.

Recurring "low power" complaints from the operator of a 5130B Front Shovel.

What is the first step that should be performed in a logical troubleshooting procedure?

What additional steps should be performed to locate the source of the "low power" complaints?

What components or faults could cause the "low power" complaints? List the steps you would perform in your troubleshooting procedure to identify the cause of the "low power" complaint.

DIRECTIONS SITUATION QUESTIONS

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ANSWER SHEET

PRE/POST TEST

1. A B C D 2. A B C D 3. A B C D 4. A B C D 5. A B C D 6. A B C D 7. A B C D 8. A B C D 9. A B C D 10. A B C D 11. A B C D 12. A B C D 13. A B C D 14. A B C D