Tpc 342 Flashcards
(25 cards)
What is the most common type of failure in jaw clutches?
Jaw breakage
What can also be considered a takeoff member?
V-belt sheave, shaft, or gear
Signs of localized wear could indicate what?
Misalignment of clutch parts
Frequent slippage of a brake or clutch can create rapid wear which is usually a sign of?
Overloading
Chatter occurs mostly during engagement of the unit. It’s usually caused by?
Loose or faulty actuating devices
Friction clutches use one or more discs to?
Transmit torque to the load
Remember that rapid wear of friction surfaces usually results from?
Overheating
As the slip speed drops to zero what happens to the torque?
It increases
What are the units two important factors to dissipate heat?
Its size and its armature speed
If the brake or clutch fails to engage properly what should you check?
The voltage supply to the coil
At the maximum output speed, the flanges on the input shaft are…
Closest together
The best protection for enclosed drives to protect against the unwanted heat is?
To make a homemade baffle
How should you go about no load testing?
Operate the drive through its full speed range with no load applied
If ridges are present how can you go about removing them from the flanges?
By sanding or polishing
In an enclosed drive, high temperatures usually result from overloading the…
Shaft bearings
The amount of slip is a measure of the turbines efficiency. It is normally a difference of _____ to _____ percent.
3 to 5 at full load
A condition called a stall load can occur where there is 100% slip. That is…
The impeller is rotating, but the turbine isn’t
Be sure that you are using the right amount of fluid. Otherwise the slip could become too high and cause…
Overheating
When fitted with more than one free rotating stator it is referred to as a…
Polyphase converter-coupling
Many seals become hard and cracked after lengthy use, when should you replace them?
Whenever you find them during inspections
What ratings are usually expressed in horsepower?
Thermal capacities
What permits you to vary the input speed to the gear drive?
Drive with adjustable speed belt
The major cause of drive failure is?
Improper lubrication
What kind of overload system works by allowing the sprocket to slip when an overload exceeds the torque rating?
Spring-operated overload drive
