Hydraulic troubleshooting
Study online at https://quizlet.com/_hv821q
1. Ingested________________ is a common cause of erratic actuator movement.: air
2. Reduced flow due to a worn pump can result in ______________________ actuator
speed.: slow
3. A fault in a relief valve when used with a(n) ______________________ pump can
create a fast actuator speed fault.: fixed-gear
4. A major cause of incorrect deceleration is ______________________ of the compo-
nents used to control the actuator.: misadjustment
5. A worn motor that is causing a slow actuator speed fault will have in-
creased______________________ flow.: case drain
6. A cylinder cushion is used to ______________________ the cylinder rod.: decelerate
7. The ______________________ portion of the hydraulic circuit is the most common
cause of a machine sequence fault in which the actuator will not move.: control
8. An actuator that moves out of ______________________ is most often caused by
a faulty sensor or the PLC.: sequence
9. A(n) ______________________ valve malfunction or a failure of the DCV to shift are
possible causes of a pressure change fault.: relief
10. ______________________ change problems are a result of either the flow being
incorrect or the flow not changing.: Speed
11. Most multiple pressure circuits use a(n) ______________________ to vent the
remote port of a relief valve.: DCV
12. If an actuator moves out of sequence, compare the sequence of the PLC's
______________________ to the program sequence.: indicators
13. A(n) ______________________ system pressure fault occurs when a component
fails in such ways that flow from the pump stops or resistance to the flow
stops.: zero
14. A(n) ______________________ system pressure fault occurs when a component
fails in such ways that flow to the system is reduced or fluid is being leaked to
the reservoir.: low
15. An increase in flow to the system can create a(n) ______________________ system
pressure fault.: high
16. The ______________________ on a hydraulic system should be turned off in the
summer to avoid overheating the hydraulic fluid.: heater
1/7
, Hydraulic troubleshooting
Study online at https://quizlet.com/_hv821q
17. Hydraulic piping must be adequately supported to avoid
______________________.: vibration
18. An actuator that does not move indicates a machine ______________________
related fault.: sequence
19. The ______________________ method of troubleshooting tests the components
that are known to cause the symptoms observed.: symptom and cause
20. A flowchart typically guides the troubleshooter through a list of
______________________ for each symptom.: causes
21. A branching, or ______________________, element is represented by a diamond
and asks a question to the troubleshooter.: decision,
22. Flowcharts provide a(n) ______________________ path to follow.: logical
23. If the PLC's output indicator is on, but the output device does not function,
the problem is in the output device or the wires between the output device and
the ______________________.: PLC
24. A blocked drain port on the pressure- reducing valve will result in a(n)
______________________ pressure that is too high.: outlet
25. A worn poppet will result in ______________________pressure.: low
26. A blocked drain line on a pressure- reducing valve will create
______________________ pressure.: high
27. If the pressure-reducing valve's setting is too close to a fixed gear pump's
pressure, the valve may ______________________.: chatter
28. Erratic pressure due to a loss of fluid stiffness could be due to
______________________ in the fluid.: air
29. If the orifice in the balanced piston relief valve is blocked, flow will be directed
to the ______________________.: reservoir
30. Vibration in the system can change the setting of the relief valve to a(n)
______________________ pressure.: lower
31. If the internal components of the balanced piston relief valve start to stick,
erratic or ______________________ actuator operation can be seen.: sluggish
32. ______________________ occurs when air is present in the fluid and the poppet
opens and closes rapidly.: Chattering
2/7
Study online at https://quizlet.com/_hv821q
1. Ingested________________ is a common cause of erratic actuator movement.: air
2. Reduced flow due to a worn pump can result in ______________________ actuator
speed.: slow
3. A fault in a relief valve when used with a(n) ______________________ pump can
create a fast actuator speed fault.: fixed-gear
4. A major cause of incorrect deceleration is ______________________ of the compo-
nents used to control the actuator.: misadjustment
5. A worn motor that is causing a slow actuator speed fault will have in-
creased______________________ flow.: case drain
6. A cylinder cushion is used to ______________________ the cylinder rod.: decelerate
7. The ______________________ portion of the hydraulic circuit is the most common
cause of a machine sequence fault in which the actuator will not move.: control
8. An actuator that moves out of ______________________ is most often caused by
a faulty sensor or the PLC.: sequence
9. A(n) ______________________ valve malfunction or a failure of the DCV to shift are
possible causes of a pressure change fault.: relief
10. ______________________ change problems are a result of either the flow being
incorrect or the flow not changing.: Speed
11. Most multiple pressure circuits use a(n) ______________________ to vent the
remote port of a relief valve.: DCV
12. If an actuator moves out of sequence, compare the sequence of the PLC's
______________________ to the program sequence.: indicators
13. A(n) ______________________ system pressure fault occurs when a component
fails in such ways that flow from the pump stops or resistance to the flow
stops.: zero
14. A(n) ______________________ system pressure fault occurs when a component
fails in such ways that flow to the system is reduced or fluid is being leaked to
the reservoir.: low
15. An increase in flow to the system can create a(n) ______________________ system
pressure fault.: high
16. The ______________________ on a hydraulic system should be turned off in the
summer to avoid overheating the hydraulic fluid.: heater
1/7
, Hydraulic troubleshooting
Study online at https://quizlet.com/_hv821q
17. Hydraulic piping must be adequately supported to avoid
______________________.: vibration
18. An actuator that does not move indicates a machine ______________________
related fault.: sequence
19. The ______________________ method of troubleshooting tests the components
that are known to cause the symptoms observed.: symptom and cause
20. A flowchart typically guides the troubleshooter through a list of
______________________ for each symptom.: causes
21. A branching, or ______________________, element is represented by a diamond
and asks a question to the troubleshooter.: decision,
22. Flowcharts provide a(n) ______________________ path to follow.: logical
23. If the PLC's output indicator is on, but the output device does not function,
the problem is in the output device or the wires between the output device and
the ______________________.: PLC
24. A blocked drain port on the pressure- reducing valve will result in a(n)
______________________ pressure that is too high.: outlet
25. A worn poppet will result in ______________________pressure.: low
26. A blocked drain line on a pressure- reducing valve will create
______________________ pressure.: high
27. If the pressure-reducing valve's setting is too close to a fixed gear pump's
pressure, the valve may ______________________.: chatter
28. Erratic pressure due to a loss of fluid stiffness could be due to
______________________ in the fluid.: air
29. If the orifice in the balanced piston relief valve is blocked, flow will be directed
to the ______________________.: reservoir
30. Vibration in the system can change the setting of the relief valve to a(n)
______________________ pressure.: lower
31. If the internal components of the balanced piston relief valve start to stick,
erratic or ______________________ actuator operation can be seen.: sluggish
32. ______________________ occurs when air is present in the fluid and the poppet
opens and closes rapidly.: Chattering
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