301 C & E Pump, Actuator & Motor Service Flashcards
A Pump that is termed as reversible is able to?
Change direction of flow within the pump.
How can contamination failures be identified?
Sandblasted appearance on pressure plates, bearings and shafts.
As pump outlet pressure increases the pumps internal leakage…?
Increases
How can lack of lubrication failures be identified?
Blueing of Metal Metal Transfer Overheating Heavy Wear
What three things can cause cylinder failures?
Internal and External Leakage Structural Damage Contamination
After installing a new motor, what 4 steps need to be followed during startup?
Back off System relief controls Operate at no load and check for leaks Apply a load to warm up and set reliefs Perform full system load test
If starting a job on a machine, what is your first step, wash the machine or check the parts manual?
Wash the machine, parts manual is not a service manual.
What is shaft skip?
Shaft skip is an inaudible skipping of shaft teeth.
What do you check a Cylinder Rod for when rebuilding?
Bending Cracking Damage Straightness Out of Round
How do you accurately measure a cylinder rod for straightness?
Use a set of V Blocks and a dial indicator.
When doing a failure analysis of a cylinder, motor or pump, what things need to be analyzed?
Condition of part Type, Condition of oil and filters Operating conditions/symptoms Condition of other parts Severity of worksite Age of part Previous services completed
How is internal leakage on a cylinder noticed?
Slow cycle times High Temperature
How can cavitation failures be identified?
Pitting Erosion
What are three reasons that a pump may not get lubrication?
Wrong oil Low reservoir level Severe Aeration
What do you check cylinder barrels for when checking for reuse?
Cracks Dents Scoring Bore Wear Out of Round
