Vehicle Mechanics

Question 1

5 components of brakes

Answer 1

1. Compressor
2. Storage tank
3. Foot valve
4. Brake chambers
5. Brake linings

Question 2

How does the jake brake work?

Answer 2

It opens exhaust valves in the cylinders releasing the compressed air trapped in the cylinders, slowing the vehicle

Question 3

Where does our type 1 (midship pump) receive its power?

Answer 3

From a divorced PTO

Question 4

What’s done in a 6month service?

Answer 4

Level D
All filters (except air)
Oil

Question 5

What’s the reserve capacity on the engine batteries?

Answer 5

180 minutes

Question 6

To what angle are type 3s rated

Answer 6

Tilt tables up to 31 degrees (60% slope)

Question 7

When ascending a hill, what’s the max percent slope

Answer 7

30-40% slope

22-25 degree angle

Question 8

What’s the volt/amp rating of the shoreline?

Answer 8

110 volt, 20 amps

Question 9

whats a stroke sensing adjuster

Answer 9

adjusts slack when it senses the set stroke is exceeded

Question 10

What are the specs of the rear brakes?

Answer 10

They’re “s” cam drum brakes

16 1/2” x 8 5/8”

Question 11

how are foot valves designed

Answer 11

they are spring loaded

Question 12

When does engine lugging happen?

Answer 12

Too high a gear for the demand on the engine

Question 13

When does the governor have the compressor cut-in?

Answer 13

Around 80-100psi

Question 14

What’s a divorced PTO

Answer 14

the PTO separates (divorces) the driveline to “rob” the power from the engine to the pump instead of the rear axle

Question 15

how do brake chambers work (when not used)

Answer 15

diaphragms inside them prevent air from entering chamber, thus activating the brake

Question 16

What’s the rating of the engine battery charger

Answer 16

110 volt / 15 amp

Question 17

what can air dryers be filled with to separate moisture and air

Answer 17

high moisture-absorbent desiccant or an oil filter

Question 18

what is brake fade?

Answer 18

it occurs when heated drums expand away from brake linings

Question 19

What’s the 1st reservoir after the compressor called?

Answer 19

The supply or wet reservoirs

Question 20

What kind of batteries are on the engine?

Answer 20

5 - group 31 maintenance free batteries

Question 21

4 components of hydrostatic pump (324, 319)

Answer 21

1. hydrostatic pump
2. hydrostatic motor
3. hydraulic reservoir
4. pump control

Question 22

How do the disc brakes function?

Answer 22

They’re air actuated with automatic slack adjusters

Question 23

What’s a 12month service

Answer 23

Level E

Inspect & prevent problems

Question 24

What type of scene lights are on the engine?

Answer 24

500 W quartz light

Question 25

What kind of PTO is found in the type 3s

Answer 25

A married PTO

Question 26

If you're stuck, how much should you lower air in tires

Answer 26

Down to 30psi | Equivalent to 12000lbs of weight loss

Question 27

whats a clearance sensing adjuster

Answer 27

adjusts when the proper clearance between the brake drum and brake shoe is not maintained

Question 28

what is the safety valve on air reservoirs usually set at

Answer 28

150psi

Question 29

how do disc brakes work

Answer 29

power screw works like a c-clamp so the lining pads exert equal force to both sides of discs or rotors

Question 30

When traversing, what is the max angle you should take?

Answer 30

25 degrees

Question 31

How are most compressors lubricated?

Answer 31

Engine lubrication system

Question 32

What's a 24month service

Answer 32

Level F Transmission, transfer case, differential, brake fluids Replace batteries & belts Plus 6/12 month service

Question 33

How big are our brake discs?

Answer 33

17"

Question 34

why are safety valves installed on air reservoirs

Answer 34

in case the governor malfunctions, protects tanks from rupture

Question 35

What is the unloading stage?

Answer 35

It's when the brake system has air between 80-135psi.

Question 36

What's the typical cut out level of the air compressor?

Answer 36

Around 125-135psi

Question 37

what separates a PTO from a hydrostatic pumped engine

Answer 37

hydrostatic operates independent of the transmission, does not rely on engine RPM

Question 38

how do brake chambers work (when in use)

Answer 38

air is forced into the chamber and the diaphragm pushes the slack adjuster and activates the brake pads

Question 39

What are reservoirs after the first one called?

Answer 39

Primary, secondary or dry reservoirs

Question 40

What is the rated GPM flow of the deck gun (Akron apollo 4322)

Answer 40

1250gpm

Question 41

What's the amp rating for the belt driven alternator

Answer 41

270 amps

Question 42

where might an air dryer be in the system of air brakes

Answer 42

between the compressor and the wet reservoir

Question 43

How does the married PTO work on our type 3s, water tenders?

Answer 43

There's a transfer case that allows the power to be sent to the front & rear axle

Question 44

How much longer can stopping be in inclement weather

Answer 44

3-15x longer

Question 45

At what angle should you use extreme caution

Answer 45

When over 15 degrees

Question 46

At what pressure will the governor cause the compressor to return to the loading stage?

Answer 46

No lower than 80psi

Question 47

What is the rating of the monitor base off the engine (Akron apollo 4322)

Answer 47

800gpm

Question 48

Where do about 50% of accidents happen

Answer 48

At intersections

Question 49

what is necessary to keep automatic slack adjusters in adjustment daily

Answer 49

a number of full brake applications above 90psi per day

Question 50

Weight limit of ladder rack on engine

Answer 50

400lbs