VD-C10 Flashcards
What does pump cavitation sound like
Sounds like gravel circulating through the pump
What do you do if your pump is cavitating
Reduced engine RPM or partially closed discharge gate
What type of gauge must be on the inlet
A compound gauge to read vacuum
What portion of the pump move the water and increases the pressure
The impeller
How do you correct an overheating pump
Partially open the tank fill valve or partially open a real line or partially open a drain valve from a discharge
What is overspeed
Running an engine faster than 90% of its peak
What is the priming pump
An auxiliary pump to create vacuum to prime the main pump it is a rotary vein type driven by an electric motor
What is a relief valve what pressures does it operate in
An automatic safety valve and pressure regulator with Settings between 75 PSI and 300 psi
What is the recommended time to close a discharge to prevent water hammer
3 to 10 seconds
What’s the max time you can crank a starter
Do not crank longer than 30 seconds wait two minutes before reattempted to start
What are the normal temperature ranges for coolant
160 to 195 is normal max temperature of 210 is not to be exceeded
What pressure must the air compressor maintain to operate a vehicle after an air loss
40 psi any lower and the spring brake will lock
What is pumped cavitation
A condition in a centrifugal pump when output exceeds input
Telma retarders are required on emergency vehicles With what gross vehicle weight
24,000 pounds gross vehicle weight
How much of the breaking can the Telma retarder handle
80 to 90%
What is the best position for the Telma on downhill driving
Position to to obtain the best endurance
If the Telma retarder is overheated what do you not do
Never attempt to cool the Telma using water warping of rotor can occur
How does the Telma interact with an ABS system
Telma is deactivated when brake is activated and ABS used
How long should a diesel engine be idol before shutting it down
3 to 5 minutes on idle to cool the engine
What do you do for long periods of idle
Long periods of idle is not beneficial to engine wear bringing RPMs to 1000
Length of time you can run the priming pump
30 seconds on a 1000 GPM pump or 45 seconds on a 1500 GPM pump under no circumstances should priming continue for one minute uninterrupted
Pumping in the standby positions reduce pressure to what
Below 50 psi
