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Vehicle Mechanics > Vehicle Mechanics > Flashcards

Vehicle Mechanics Flashcards

1
Q

5 components of brakes

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

How does the jake brake work?

A

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

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3
Q

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

A

From a divorced PTO

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4
Q

What’s done in a 6month service?

A

Level D
All filters (except air)
Oil

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5
Q

What’s the reserve capacity on the engine batteries?

A

180 minutes

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6
Q

To what angle are type 3s rated

A

Tilt tables up to 31 degrees (60% slope)

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7
Q

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

A

30-40% slope

22-25 degree angle

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8
Q

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

A

110 volt, 20 amps

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9
Q

whats a stroke sensing adjuster

A

adjusts slack when it senses the set stroke is exceeded

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10
Q

What are the specs of the rear brakes?

A

They’re “s” cam drum brakes

16 1/2” x 8 5/8”

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11
Q

how are foot valves designed

A

they are spring loaded

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12
Q

When does engine lugging happen?

A

Too high a gear for the demand on the engine

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13
Q

When does the governor have the compressor cut-in?

A

Around 80-100psi

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14
Q

What’s a divorced PTO

A

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

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15
Q

how do brake chambers work (when not used)

A

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

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16
Q

What’s the rating of the engine battery charger

A

110 volt / 15 amp

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17
Q

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

A

high moisture-absorbent desiccant or an oil filter

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18
Q

what is brake fade?

A

it occurs when heated drums expand away from brake linings

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19
Q

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

A

The supply or wet reservoirs

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20
Q

What kind of batteries are on the engine?

A

5 - group 31 maintenance free batteries

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21
Q

4 components of hydrostatic pump (324, 319)

A
  1. hydrostatic pump
  2. hydrostatic motor
  3. hydraulic reservoir
  4. pump control
22
Q

How do the disc brakes function?

A

They’re air actuated with automatic slack adjusters

23
Q

What’s a 12month service

A

Level E

Inspect & prevent problems

24
Q

What type of scene lights are on the engine?

A

500 W quartz light

25
Q

What kind of PTO is found in the type 3s

A

A married PTO

26
Q

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

A

Down to 30psi

Equivalent to 12000lbs of weight loss

27
Q

whats a clearance sensing adjuster

A

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

28
Q

what is the safety valve on air reservoirs usually set at

A

150psi

29
Q

how do disc brakes work

A

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

30
Q

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

A

25 degrees

31
Q

How are most compressors lubricated?

A

Engine lubrication system

32
Q

What’s a 24month service

A

Level F
Transmission, transfer case, differential, brake fluids

Replace batteries & belts

Plus 6/12 month service

33
Q

How big are our brake discs?

A

17”

34
Q

why are safety valves installed on air reservoirs

A

in case the governor malfunctions, protects tanks from rupture

35
Q

What is the unloading stage?

A

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

36
Q

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

A

Around 125-135psi

37
Q

what separates a PTO from a hydrostatic pumped engine

A

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

38
Q

how do brake chambers work (when in use)

A

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

39
Q

What are reservoirs after the first one called?

A

Primary, secondary or dry reservoirs

40
Q

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

A

1250gpm

41
Q

What’s the amp rating for the belt driven alternator

A

270 amps

42
Q

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

A

between the compressor and the wet reservoir

43
Q

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

A

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

44
Q

How much longer can stopping be in inclement weather

A

3-15x longer

45
Q

At what angle should you use extreme caution

A

When over 15 degrees

46
Q

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

A

No lower than 80psi

47
Q

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

A

800gpm

48
Q

Where do about 50% of accidents happen

A

At intersections

49
Q

what is necessary to keep automatic slack adjusters in adjustment daily

A

a number of full brake applications above 90psi per day

50
Q

Weight limit of ladder rack on engine

A

400lbs

Vehicle Mechanics (1 decks)

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