08LAB

Service Training MALAGA

Quiz & Tests

INSTRUCTOR REFERENCE BOOK

Francis May 1998

MALAGA TRAINING CENTER PRE/POST TEST

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) b) c) d) e)

Pilot relief valve Combiner and main relief valve PRV valve Crossover valve 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) b) c) d)

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

Providing a restriction on the pressure side of valve Providing a restriction in the return circuit Moving the track brake valve to engage automatically All of the above

5. The underspeed control system is part of the: a) b) c) d)

Track motor hydraulic circuit Pilot system circuit Track brake circuit Electronic control system

6. The valve that provides signal pressure to destroke the main pumps is called: a) b) c) d)

Page:

Boom vent valve Overspeed valve Underspeed valve Proportional reducing valve

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MALAGA TRAINING CENTER PRE/POST TEST

7. The hydraulic lock lever prevents implement movement in the safe position by: a) b) c) d)

Venting the pilot relief valve and dumping oil Return pilot pump flow back to the tank Blocking pilot flow to the pilot control valves 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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MALAGA TRAINING CENTER PRE/POST TEST

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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MALAGA TRAINING CENTER PRODUCT DESCRIPTION

LAB EXERCISES

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

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

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MALAGA TRAINING CENTER PUMP & PUMP CONTROLS

LAB EXERCISES

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

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SPECIFICATION

ACTUAL

PS PRESSURE

MALAGA TRAINING CENTER PUMP & PUMP CONTROLS

LAB EXERCISES

Test and Adjust Negatif Flow Control (NFC) Machine Model____________________________

Date__________________________________

Serial Number_____________________________

Service Meter Hours_____________________

NEGATIF FLOW CONTROL ADJUSTMENT PUMP POSITION UPPER PUMP

LOWER PUMP

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SPECIFICATION

ACTUAL

PS PRESSURE

MALAGA TRAINING CENTER PILOT SYSTEM

LAB EXERCISES

Test and Adjust Pilot System Relief Valves Machine Model____________________________

Date__________________________________

Serial Number_____________________________

Service Meter Hours_____________________

PRESSURE TESTS TESTS Pilot system pressure (w/engine at high idle)

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SPECIFICATIONS

ACTUAL

MALAGA TRAINING CENTER IMPLEMENT & TRAVEL SYSTEM

LAB EXERCISES

Test and Adjust Implement & Travel System Relief Valves Machine Model____________________________

Date__________________________________

Serial Number_____________________________

Service Meter Hours_____________________

PRESSURE TESTS

TESTS Implement system pressure (w/engine at high idle)

Travel System Pressure (w/engine at high idle)

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SPECIFICATIONS

ACTUAL

MALAGA TRAINING CENTER IMPLEMENT & TRAVEL SYSTEM

LAB EXERCISES

Test and Adjust Tow Speed Track Automatic Change Pressure Machine Model____________________________

Date__________________________________

Serial Number_____________________________

Service Meter Hours_____________________

PRESSURE TESTS

TESTS Travel system pressure (w/engine at high idle)

Pilot signal Pressure (w/engine at high idle)

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SPECIFICATIONS

ACTUAL

MALAGA TRAINING CENTER INSTRUMENT PANEL

LAB EXERCISES

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

- 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,

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MALAGA TRAINING CENTER POST TEST

CASE STUDY

325B Hydraulic Excavator Case Study DIRECTIONS

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

SITUATION

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

QUESTIONS

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?

DIAGNOSTIC CHECKS

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List the steps you would perform in your troubleshooting procedure to identify the cause of the "low power" complaint.

MALAGA TRAINING CENTER PRE/POST TEST

ANSWER SHEET

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13

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

15.

A

B

C

D