Podcast
Questions and Answers
What is an indicated cause of scratches and grooves on a motor?
What is an indicated cause of scratches and grooves on a motor?
What is the primary issue indicated by erosion (pitting) on a valve plate?
What is the primary issue indicated by erosion (pitting) on a valve plate?
What operational condition can lead to scoring marks on a valve plate?
What operational condition can lead to scoring marks on a valve plate?
What can result from cavitation in a motor?
What can result from cavitation in a motor?
Signup and view all the answers
What may cause galling in a motor?
What may cause galling in a motor?
Signup and view all the answers
What condition might excessive outward thrust loading of the output shaft cause?
What condition might excessive outward thrust loading of the output shaft cause?
Signup and view all the answers
What is the primary cause of wear in the seal area and bearing area of a shaft?
What is the primary cause of wear in the seal area and bearing area of a shaft?
Signup and view all the answers
What could cause uneven wear between the top and bottom of a shaft?
What could cause uneven wear between the top and bottom of a shaft?
Signup and view all the answers
What does severe wear on the output part of the shaft but not on the bottom indicate?
What does severe wear on the output part of the shaft but not on the bottom indicate?
Signup and view all the answers
How does contamination typically manifest in needle bearing wear?
How does contamination typically manifest in needle bearing wear?
Signup and view all the answers
What could severe wear in the seal area of a shaft also indicate?
What could severe wear in the seal area of a shaft also indicate?
Signup and view all the answers
What causes galled wear in the seal area and face of the shaft?
What causes galled wear in the seal area and face of the shaft?
Signup and view all the answers
What does the indication of thrust load on the needle bearing side of the shaft suggest?
What does the indication of thrust load on the needle bearing side of the shaft suggest?
Signup and view all the answers
What indicates that a drive with normal wear can be reused?
What indicates that a drive with normal wear can be reused?
Signup and view all the answers
Which condition requires the drive to be discarded due to damage?
Which condition requires the drive to be discarded due to damage?
Signup and view all the answers
What is a likely cause of chipped gear teeth in a drive?
What is a likely cause of chipped gear teeth in a drive?
Signup and view all the answers
What does the term 'burnishing' refer to in the context of drive wear?
What does the term 'burnishing' refer to in the context of drive wear?
Signup and view all the answers
What does corner loading indicate in a drive's gear teeth?
What does corner loading indicate in a drive's gear teeth?
Signup and view all the answers
Which observation suggests that a drive can be used again?
Which observation suggests that a drive can be used again?
Signup and view all the answers
What is the consequence of running a drive primarily in one direction?
What is the consequence of running a drive primarily in one direction?
Signup and view all the answers
What does light wear on gear teeth suggest concerning the condition of the drive?
What does light wear on gear teeth suggest concerning the condition of the drive?
Signup and view all the answers
What does chipping on the corners of gear teeth typically indicate?
What does chipping on the corners of gear teeth typically indicate?
Signup and view all the answers
What condition must a disc valve meet to be considered ok to use again?
What condition must a disc valve meet to be considered ok to use again?
Signup and view all the answers
What is a probable cause of crown wear on a drive?
What is a probable cause of crown wear on a drive?
Signup and view all the answers
What should be done prior to applying full load to a new motor?
What should be done prior to applying full load to a new motor?
Signup and view all the answers
What does scoring on the disc valve surface typically indicate?
What does scoring on the disc valve surface typically indicate?
Signup and view all the answers
What might excessive chipping in the valve drive area suggest?
What might excessive chipping in the valve drive area suggest?
Signup and view all the answers
What kind of wear is typically caused by lack of lubrication or poor fluid viscosity?
What kind of wear is typically caused by lack of lubrication or poor fluid viscosity?
Signup and view all the answers
Why is it important for the valve drive teeth area to be in good condition?
Why is it important for the valve drive teeth area to be in good condition?
Signup and view all the answers
What is indicated by severe gear tooth wear?
What is indicated by severe gear tooth wear?
Signup and view all the answers
What might cause a disc valve to have a wear pattern around its surface?
What might cause a disc valve to have a wear pattern around its surface?
Signup and view all the answers
In what condition is it acceptable to reuse the spool valve?
In what condition is it acceptable to reuse the spool valve?
Signup and view all the answers
What is a likely consequence of the drive area wear affecting valve performance?
What is a likely consequence of the drive area wear affecting valve performance?
Signup and view all the answers
What can be concluded about the machining marks on the top of the drive?
What can be concluded about the machining marks on the top of the drive?
Signup and view all the answers
What is the main reason for implementing a proper run-in procedure for a new motor?
What is the main reason for implementing a proper run-in procedure for a new motor?
Signup and view all the answers
What should be concluded if a disc valve shows no signs of wear on its critical surface area?
What should be concluded if a disc valve shows no signs of wear on its critical surface area?
Signup and view all the answers
What could lead to scoring on the face of a valve?
What could lead to scoring on the face of a valve?
Signup and view all the answers
What condition must be present for a component to be considered OK to use again?
What condition must be present for a component to be considered OK to use again?
Signup and view all the answers
What is the leading cause of hydraulic component failure?
What is the leading cause of hydraulic component failure?
Signup and view all the answers
What damage on the output shaft keyway indicates it should not be used again?
What damage on the output shaft keyway indicates it should not be used again?
Signup and view all the answers
What condition indicates spalling in bearings?
What condition indicates spalling in bearings?
Signup and view all the answers
Which of the following is a cause of smearing noted on the Gerotor or Geroler?
Which of the following is a cause of smearing noted on the Gerotor or Geroler?
Signup and view all the answers
What type of damage occurs due to cavitation in a hydraulic motor?
What type of damage occurs due to cavitation in a hydraulic motor?
Signup and view all the answers
What is the effect of an overrunning load condition in hydraulic systems?
What is the effect of an overrunning load condition in hydraulic systems?
Signup and view all the answers
Which statement about the shaft bearing mating surfaces is true if they show no signs of wear?
Which statement about the shaft bearing mating surfaces is true if they show no signs of wear?
Signup and view all the answers
Study Notes
Drive Wear
- OK to use again: Teeth and finished surface show no signs of wear, nicks, burrs, or scratches. Inspect gear teeth and ends of the drive.
Chipped
- Do not use again: Chipped or damaged gear teeth are present. Lack of lubrication is usually the cause.
Wear
- Do not use again: Excessive wear on one side of gear teeth suggests the drive ran in only one direction. Lack of lubrication or poor fluid viscosity could lead to chipping. Burnishing (a burn mark) may indicate drive tooth wear.
Burnishing
- Do not use again: Severe wear and burnishing. Likely caused by lack of lubrication, poor fluid viscosity. Often associates with drive movement in one direction.
Gear Tooth Crown Wear
- Do not use again: Worn corner of gear tooth crown. Indicates corner loading. Could be due to excessive wear or lack of lubrication.
Drive Spline Wear
- OK to use again: Smooth, flat surface in spline area free from nicks, burrs, or scratches indicates light wear.
Wear - Gear Teeth/Chipping
- Do not use again: Light wear and chipping on gear teeth and drive corners. Rust on the shaft (not on teeth) suggests water in the fluid. Corner chipping suggests corner loading. This occurs when the motor is under heavy load.
Crown Wear
- Do not use again: Wear on the crown of the drive. Suggests insufficient lubrication.
Wear - Gear Tooth
- Do not use again: Normal wear is ok otherwise improper lubrication or viscosity is issue.
Wear & Chipping
- Do not use again: Severe wear. Improper start up or run-in procedures are a common problem.
Wear
- Do not use again: Severe wear caused by lack of lubrication or poor fluid viscosity.
Wear and Chipping
- Do not use again: Severe wear is noted. This is typically due to lack of lubrication.
Spool Valve
- OK to use again: Smooth, flat surfaces free from scratches on spool valve. Seal and bearing areas show no wear.
Scored
- Do not use again: Excessive Outward Thrust loading. Excessive case pressure and backpressure can cause this type of wear.
Scored
- Do not use again: Uneven wear between the top and bottom of shaft. This is due to side loading and/or contamination.
Scored
- Do not use again: Wear in seal and bearing area, likely caused by abrasive contamination in hydraulic fluid.
Scored
- Do not use again: Severe wear in needle bearing area. Contamination of the hydraulic system is likely the underlying cause.
Smeared
- Do not use again: Smearing or wear on the output shaft (not the bottom part) indicates side loading, likely from a pulley or chain being too tight.
Galled
- Do not use again: Severe wear in the seal area and the face of the shaft, caused by contamination. More wear on the output end than on the shaft top usually points to possible side-loading.
Galling
- Do not use again: Damage on the needle bearing side of the shaft. This indicates thrust loads, pulling forces, high case pressure, and/or high back-pressure.
Scored
- Do not use again: Severe wear, even wear throughout the surface. Likely the contamination issue.
Scoring, Smeared
- Do not use again: Damage to the keyway resulting from improper cup-link fit. Likely contamination suspended in fluid.
Galled
- Do not use again: Severe wear (material removal or grooves) around shaft. Indicating lack of lubrication, and abrasives in the fluid.
Galled
- Do not use again: Galling is noted. Presence of material removed from one surface due to friction, and attached on the mating-component surface. Suggests lack of proper lubrication, high backpressure, or thrust loading.
Scored
- Do not use again: Scoring marks on disc valve surface suggests contamination, possible in high-pressure hydraulic fluid.
Disc Valve
- OK to use again: No wear on the surface. Free from scratches, burrs, and nicks.
Wear
- Do not use again: Wear pattern suggests contamination, probably fine abrasives suspended in the hydraulic fluid, on the disc valve surface.
Wear
- Do not use again: Chipping in the valve drive area. Wear is likely due to one-directional operation, insufficient lubrication, or viscosity. Poor lubrication and fluid viscosity can cause timing issues; and cause hydraulic fluid to cross port from high pressure side to low pressure sides, resulting in poor performance.
Valve Drive
- OK to use again: Smooth and flat surface of the disc motor valve drive surface which is free of any damage or wear.
OK to use again
- The teeth and finished surface show no signs of wear, nicks, burrs or scratches. Inspect gear teeth and ends.
Bearing
- OK to use again: The shaft bearing mating surfaces are smooth and free from nicks, burrs, or scratches.
Spalling
- Do not use again: The bearing shows damage due to spalling, where material is removed from the running surface. This is a progressive process that spreads and is often indicative of contamination.
Output Shaft Keyway Chipping
- Do not use again: Significant wear or chipping at the coupling end of the output shaft. Suggests the coupling is improperly fitted to the shaft.
Gerotor or Geroler - Smeared and Erosion
- Do not use again: Smearing across the gerotor star face and roller ends suggests a lack and/or improper lubrication. An overrunning condition is also a possibility.
Scoring
- Do not use again: Wear in the Gerotor roller areas is likely due to contamination.
Erosion/Pitting
- Do not use again: Erosion on the valve plate indicates the motor likely cavitated, usually due to overrunning conditions, where the motor turns too quickly, not enough fluid can be pumped in, which leads to vapor bubbles collapsing with high impact causing component damage and/or heat issues.
Scoring and Erosion
- Do not use again: Erosion and scoring on the valve plate, likely caused by overrunning conditions.
Galling, Overrunning Load
- Do not use again: Galling, chipping, and scoring suggest a possible overrunning load condition where the motor may have been shifting back and forth too quickly.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge on the inspection of drive wear components and identify the various conditions that determine whether a gear can be reused. This quiz will cover aspects such as chipped gears, excessive wear, and burnishing effects on gears. Understand diagnostic indicators crucial for maintaining gear integrity.
