Apparatus questions Flashcards
Normal op temp for allison transmissions
180-220*
Max tranny temp
330* on all rigs except old reserves 300*
Static air brake test should not lose more than ____ psi for engine, truck
2 psi engine
3 psi truck
Theoretical lift when drafting
33.9’
remaining pressure on intake gauge after opening a discharge gate
residual pressure
Applied brake test should not lose more than ___ psi on engine, truck
3 psi engine
4 psi truck
Actual lift when drafting at sea level
22.5’
Aspect ratio
profile of the tire. section height divided by section width and expressed as a percentage
with electronic transfer valve its only necessary to throttle down if PDP exceeds ___ psi, per waterous
250 psi
Practical lift when drafting
20’
4 cycles of a diesel engine
intake (down)
compression (up)
power (down)
exhaust (up)
Per waterous with a manually operated transfer valve, you should slow engine speed to reduce PDP to ____ psi or less. What rigs would this affect?
75 psi
4290
If regen is urgent what is sign on dash
flashing dpf lamp
Engine compartment belts are allowed up to ____ play at the center of the belt
3/4”
what is brake fade
brake linings get hot, the glue softens and starts to melt and linings get slick. W/o aut. slack adjustors it could cause them to run out of stroke from heat expanding drums
what needs to be done after using reclaimed water hydrant
1 quart bleach poured into tank
clean all fittings with potable water
regen required soon, sign on dash
solid dpf lamp
size of helispots at 16A? How many?
25’x25’
3
what is at each helispot on 16A
reclaimed hydrant with 2- 2 1/2” outlets w/ about 50psi
regen most urgent, sign on dash
flashing dpf and check engine light, solid amber warning light
How long do you have to regen if most urgent happens
4 hours
what happens if not done in 4 hours
soot level rises above level 4
you will get flashing dpf, check engine, stop engine and amber warning light.
Call Robert
pressure on intake gauge prior to opening any discharge gate
Static pressure
procedure for towing fire engine
towed in neutral 1 mile or less at no more than 30mph
more than 1 mile, disconnect drive shaft or get flat bed
how long are FG-1s kept
5 years
NFPA standard for fire apparatus driver/operator professional qualifications
1002
What is FG-1
daily vehicle inspection form
Net pump pressure
difference between residual and PDP, actual work the pump is doing
FG-5
Maintenance record form, signed by mechanic when repairs have been completed
valve called for the intake relief valve on the panel
pilot valve
maintain what pressure when drafting
50 psi
FG-2
maintenance request form
NFPA standard for fire apparatus
1901
How does spring brake chamber work
a spring inside the chamber applies the brake mechanically when pressure is released
what pressure we test 4” hose and how long
300 psi 5 minutes
describe color of exhaust, blue, black, white
burning oil
running rich
water in combustion chamber
NFPA for aerial ladder and elevating platforms fire apparatus
1904
what direction are even street addresses
south
east
hose test 3” hose @
350 psi 5 minutes
discharge relief valve must be turned off if pumping above what pressure
300 psi
Range of discharge relief valve
75-300*
hose test 1” booster, 1” brush, 1 1/2” brush @
300 psi
minimum tread depth for front tires, rear tires
4/32” front, 2/32” rear
hose test 1 3/4”, 2 1/2” including high rise pack @
400 psi
Engine idle rpm ’08s
700 rpm
Regen rpm
oil pressure
1400 RPM 50 psi (fluctuates quite a bit tho)
What is pre set safety valve psi on wet tank
150 psi
What is the engine volts when running?
not running?
14-14.3 volts (14.7 is max in perfect scenario, not possible)
12.7 volts (roughly, fluctuates)
If engines running and you notice low voltage what may this indicate
alternator problem
When the engine warms up will the oil pressure get higher or lower
Lower (oil thins out when it warms up)
Oil pressure at idle on ’08s
25-30 psi (depending on engine temp)
3 main components of the pump
pump transmission
body assembly
impellar shaft
What on our pumps drive the transmission and impellar shaft? Why do we use this?
Chain drive from pump trans to impellar shaft
they have more surface contact and are quieter. 50% of chain in contact at all times.
pump trans oil lubes chain sprocket
Which turbo is high pressure turbo and which is the low on ’08s
Top- Low pressure
bottom- High pressure
What does 1500 gpm pump capacity mean
is from testing the pump at draft 10’ using a single 6” hose to the steamer connection
What is Friction Loss
examples of different effects on FL
Loss of energy in pressure due to resistance as water flows thru hoses, fitting, appliances etc.
Size of hose, length of hose, any bends or kinks, quality of hose itself
define head pressure
The vertical distance of the water supply to where its being used. (.434 x height)
what are and how many reservoirs for brake system are there
4-on older seagraves
3-on ’08s to present
primary- rears and maxis
secondary-front and aux systems
wet tank (supply tank)- stores a volume of air so its always available
emergency tank- allows rig to be moved when air presure was lost (on older rigs)
adjustment range of intake relief valve?
BFD set at?
50-250 psi
200 psi
Explain pump service test
pump for 20 mins at 100% rated capacity @ 150 psi net pressure. cant lose more than 13 psi
10 mins @ 70% (1050gpm)rated capacity @200 psi net pressure. cant lose more than 12 psi
10 mins @ 50% (750gpm) rated capacity @ 250 psi net pressure. cant lose more than 11 psi
nfpa for inspection, maintenance, and testing of fire engines
nfpa 1911
per DMV: range of low air alarm
55-75 psi (bfd 60 psi)
Temp you would open aux engine cooler on ’08s
KME
200*
210
per dmv: spring brakes apply at?
20-45 psi (bfd 30 psi)
When would you use radiator refill?
only emergency situation w/ catastrophic loss of radiator fluid. (hole in radiator etc)
Radio for all crews to back out because of emergency
per dmv: cut out pressure?
cut in pressure?
130 psi max (bfd 120psi)
no less than 85 psi
definition of brake chamber
air operated cylinders that apply mechanical force to pushrod and slack adjustors
steps for static brake test
Chock wheels N Ignition ON ALL brakes OFF verbalize starting pressure, 1 min. system should not lose more than 2 psi engine, 3 psi truck
steps for applied brake test
Chock wheels N Ignition ON ALL brakes OFF step on brake pedal after initial drop, verbalize tank pressure hold pedal for 1 minute pressure should not drop more than 3 psi engine, 4 psi truck
Definition of slack adjustor
lever that transmits brake chamber force to the brake assembly. Also takes up slack between brake shoes and drums
Function of intake relief valve
safety valve that dumps excess pressure from inlet side of the pump. Helps prevent water hammer
less likely to burst supply line
color of discharge relief valve if valve is closed
green
light colors for pressure and volume on old rigs
green pressure
orange volume
light colors for pressure and volume on new rigs
orange pressure
green volume
color of discharge relief valve if valve is open
amber
valve callled that turns on/off discharge relief valve
4 way valve
what is stroke of an engine
movement of the piston from TDC to BDC
what pressure do we flush all older seagraves at
100 psi
what pressure do we pump foam on older seagraves
200 psi
Max amount of hard suction you can use on patrol 11
24’
Max psi for relay pumping
180 psi
2 cycles of the air dryer
charge cycle
purge cycle
What psi to pump for relay pumping operation
FL + 20 psi
who shuts down first in relay pumping ops
attack pumper
what must be coordinated by all engineers before shutting down when relay pumping
throttle down simultaneously
3 stages of fuel filter/water seperator
seperating
coalascing
filtering
2 main components of discharge relief valve
Pilot valve (hydraulically controls function of system) Relief valve (relief valve proper)
What is the discharge relief valve
spring loaded, pressure actuated safety device that protects the nozzle member and components of the pump from high pressure surges by rerouting water from discharge back to intake side of the pump
temp to operate aux engine cooler on all engines except the ’08s
190*
What makes up electrical system
ignition
batteries
alternator
retarder shouldnt be used on wet or slippery roads or when trans temp exceeds what temp
330*
governed rpm on apparatus
2100 rpm
Power steering system is ____ driven
gear
What regulates the air pressure in system
governor
Air compressor is ____ driven
gear
what gpm does waterous recommend for interior firefight with CAF
90 gpm
what should foam be set at for interior firefighting
.3%
for an all risk type fire using CAFS what should you throttle up to on your main discharge guage after engaging the compressor
100 psi
NP of CAF/flex attack nozzle if flowing just water
50 psi
suction capacity of vita motivator (gpm)
80-120 gpm
At ____ feet the usable gpm of vitamotivator is reduced by approximately ____%
300’
30%
before using vitamotivator your tank should have at least how much water
1/4 tank
vitamotivator suction lift up to
20’
discharge head of vitamotivator
20-70’
what does discharge head mean
vertical distance it will pump a liquid
inlet pressure of vitamotivator
50-125 psi
valve on vitamotivator is
clapper valve
What position should cab tilt valve be in to electrically raise and lower the cab ’08s? Position for normal driving?
center
All the way back, away from you
max amount of time to prime pump if it wont prime is
45 secs 30 secs (14,16)
pump body is made of
cast iron
transfer valve made of
bronze
impellars made of
bronze, flame plated (added tungsten carbide)
impellar shaft made of
stainless steel
intake screens
zinc die cast
per waterous, what is size of tank to pump valve
3 1/2”
per BFD JS, what is size of tank to pump valve
3”
per waterous, when should you transfer to volume
2/3 the pump capacity (about 1000gpm)
per bfd js, when should you transfer to volume
master stream or
more than 3- 2 1/2” lines (before the 4th line switch over)
2/3 pump capacity per waterous (1000 gpm)
Drafting
3 shift indicator lights are furnished to tell you your in pump gear what are they?
what other indicators are there?
pump engaged in cab ok to pump in cab Mph gauge throttle ready on panel pdp gauge reading pressure pump panel light (not as reliable,could be burned out)
pump trans holds ___ qts of ____ fluid, ’08s
12 qts, ATF
which discharges have foam/CAF capabilities ’08s
#3- eng side blue handle #4- rear stinger black handle #8- capt side red handle front bumper orange handle (1 1/2" discharge) Deck gun gray handle
4 main components of advantus 6 foam system
OIT (operator interface terminal)
12 volt foam pump
microprocessor controller
foam process manifold
what does OIT display
flow rate
mix %
total water
total foam
how do you lock the display on current position on OIT?
unlock?
hold select button for more than 2 seconds
press select again to unlock
After ____ seconds the OIT display will return to what position (if unlocked)
10 seconds
flow rate
if you press the up and down arrows simultaneously what happens if your display is on Total water? total foam? mix %? flow rate?
resets accumulator back to 0
resets accumulator back to 0
goes back to default mix % (.3%)
it will enter manual mode
in manual mode what is default mix %
2%
up + down arrows will move in what % increments in manual mode
.5% increments
how to exit manual mode
press up + down arrow keys simultaneously
manual mode will operate even if no water is flowing T or F
True
if sEn1 or sEn2 are displayed after pressing foam button you must? How?
go into manual mode
press up + down keys simultaneously
Advantus 6 means
outputs 6 gpm @ 150 psi
what is the brain of the foam system
microprocessor controller (makes adjustments on the fly from info gathered from 4 sensors)
what are the 4 sensors on the foam process manifold and what do they sensor
clear water sensor- measures the conductivity of water
paddle wheel flow sensor- current rate of water flow thru the foam process manifold
temperature probe- temp of water in manifold
foam solution sensor- water to foam concentrate ratio
what are some things you can do to eliminate the pump from being overheated
open discharge to flow water (booster line, hook up hose)
open tank fill to recirculate the water
when pumping feel coupling on intake, you can feel when its heating up
what does ECU prevent
damage to transmission or powertrain
if an incorrect shift occurs what happens
check trans light and buzzer come on
ECU locks into gear it was in last; will stay in this gear until engine shut down for at least 10 secs
after ECU activates and you shut down for 10 seconds what happens when you start engine again
return to N if no damage
if damage or overheated, it will not shift to higher gears. (or it may stay in N until problem is fixed)
Top speed in 2nd gear
30 mph
top speed in 3rd gear
45 mph
top speed in 4th
65 mph
top speed in overdrive
75 mph
describe theory behind positive displacement pump
pump will theoretically discharge a given amount of material for every revolution of the pump shaft
definition of compression ratio? what does 18:1 ratio mean
amount of air and gas compressed in the cylinder before igniting.
air fuel mixture has been compressed to 1/18th its original size before igniting
our eductors are rated at what gpm
95 gpm
eductors rated at what inlet pressure
200 psi
apparatus inventory shall be done on a _____ basis first ______ of the month
quarterly
saturday
(3,6,9,12) march, june, sep, dec
air compressor for the CAF system is cooled by
tank water (circulates tank water thru compressors oil cooler and back to pump
on regen system, what 2 things are collected in diesel particulate filter (DPF)
engine oil
soot
type of power steering fluid used, 08s
dexron III ATF
size hose used for ladder pipes and size of coupling
3” hose w/ 3” couplings
what is passive regeneration for ’08s
the engine provides sufficient exhaust gas temperature for regeneration (drive on fwy)
what is active regeneration ‘08
engine does not provide sufficient exhaust temp for passive regen. Use ARD rocker switch to raise temp of exhaust to provide regen
~~~
Max foam solution capability @ 150 psi you get:
___% at 1000 gpm
___% at 600 gpm
____% at 200
____% at 100
.5% @ 1000
1% @ 600
3% @ 200
6% @ 100
CAFS, the auto sync system will balance the air and water pressure + or - ____% the PDP throughout a range of ___ psi to ___ psi
5%
40-150 psi
if trans oil reaches ____F, the ECU will not allow the vehicle to shift.
Run in N @ _____ rpm until temp is at least ____F
330*
1200-1500 rpm
180-220*
type of throttle does 4106/4107 have
Vernier throttle
electrically wired to the ECM on cummins engine
what can you expect to happen when using vernier throttle?
When throttling up or down expect a 2-3 second delay. This is due to ECM performing a self check on engine
Make sure throttle is in what position prior to engaging pump on 97s
full clockwise position (throttle all the way down)
pump may fail to engage if not
what % do you pump class A foam
1/4 - 1%
we pump .3%
when does high exhaust temp light come on
842* exhaust temp
speed of less than 5mph
what makes up regeneration system
DPF- diesel particulate filter
ARD- after treatment regen device
ECM- electronic control module
tank on WT 16 is made of
stainless steel
what is limit of air ride system for WT16
20-100 psi
what are in WT16 water tank to prevent damage to tank
sacrificial anodes
A vehicle with a GVWR of ______ or more is defined as a commercial vehicle
26,001 lbs
minimum amount of 1 3/4” or 1 1/2” hose for CAF line to perform properly is
100’
minimum requirements for a Type I ICS pumper
1000 gpm pump
400 gallon tank
minimum amount of 1” hose for a CAF line to perform properly
35’
orifice sizes of the elkhart CAF nozzle
water- 15/16”
wet- 1 1/8”
dry- 1 3/8”
max operating pressure of CAF nozzle
200 psi
the elkhart flex attack CAF nozzle flows ____ gpm on 1 3/4” CAF line per job sheet.
____ gpm on 1 1/2” CAF line
90 gpm
20-30 gpm
in the water setting the CAF nozzle will flow ___ gpm at ___ NP
150 gpm
50 psi NP
temp of exhaust gases and system components can reach up to ____F during regeneration
unexpected failure temps can reach ____F
1202*F
1652*F
WT 16 is a ___ stage ____ pump w/ a rated capacity of ____ gpm @ ____ rpm @ _____ psi
single centrifugal 850 gpm 1800 rpm 50 psi
WT 16, all pumping operations pump at ____ psi @ ____ rpm
50 psi
1800 rpm
eductor back pressure must not exceed ___% to ___% of the eductor inlet pressure
65 to 70% (130-140 gpm)
eductor back pressure is determined by the sum of _______ , _____ and ______
elevation pressure
NP
FL
Max hose lay with eductor for 1 3/4” hose, class A? B?
350' class A up to 1% foam 250' class B 3-6% foam
where is load manager indicator located on new rigs
what does it do? if low what?
on dash L of steering wheel, next to ignition, headlight switches etc.
Indicates system is operating and maintaining necessary voltage.
If low voltage, light and beep goes off to indicate also stated on info center display. (12-12.2 volts it comes on) will automatically go into high idle to build up voltage
to set relief valve at 190 psi, how many counter clockwise turns from all the way up is it on ’08s, ’97s
20 half turns
16 half turns
size of orifice on strainer for discharge relief valve
.035”
which valve places the relief valve in or out of operation
4 way valve
On auxiliary cooler, which fluid is on the inside of heat exchanger and which is on outside?
Coolant flows thru little tubes on inside of heat exchanger and tank water flows on outside of the tubes to exchange heat
If radiator refill is used when there is no leak will it blow the radiator cap off?
Yes, more than likely it would. But when used for its purpose, a catastrophic leak it will not over pressurize
What is order of sensors on foam process manifold including check valve and injector?
Clear water sensor (conductivity probe) Check valve Injector Paddle wheel flow sensor Foam solution sensor (temp probe is built in to this)
What is discharge # of 4” outlet on ’08s?
What is different about the discharge gate?
#7 ( brown handle or plaque) It has a rotating wheel instead of a pull out gate (gate valve)
What is panel called that controls CAFS
auto sync control panel
3 modes of CAFS
Unload
Fixed
Auto
In Auto mode for CAF it will do what
will match PDP by + or - 5% from 40-150 psi
During pre trip, steering wheel play should?
Be 2” on a 20” wheel or shouldn’t exceed 10%
When brakes are applied the push rod from the brake chamber should not move more than ___” or a little over ____* when brakes are released
2”
90*
How much hose is carried on ’08s?
4525
How much hose is carried on ’97s?
4100’
Before doing a CAF line and you notice pdp is high what’s the problem? What do you need to do before starting?
Intake is still open
Close intake and open tank to pump
On ’08s, which small hose is the tank water TO the aux cooler? Which is one back to the tank?
Hose on Right side hose goes to aux cooler
Left side hose goes back to pump
On ’97s, which hose goes TO the aux cooler? Which hose goes back to the tank?
Left side hose goes to aux cooler
Right side goes back to pump
What is gear ratio for pump transmission on engines?
What does it mean?
2.27 ratio
The top sprocket that spins impeller shaft is going 2.27 times faster than pump trans lower sprinkler
Type of brake chambers?
How much force do they apply?
Type 30 chambers
3600 psi force (120x30)
Size of hole on cap of old rigs priming tank?
9/64”
The tiny hole on elbow of priming tank reservoir does what?
Breaks the siphon and stops flow of lubricant after priming
How much hose on 4290?
5000’
How do figure out what the pump rpm is?
Engine rpm x 2.27 which is pump trans ratio
What are the ways to interrupt the regeneration process?
Dpf inhibit switch
Engage the service brake
Release parking brake
Depress throttle pedal
Turn off engine
CAFS auto sync will balance the air and water pressure plus or minus 5% throughout a range of?
40psi- 150psi
What is slug flow?
Reaction that happens when there is not enough foam solution present to allow air and water to create bubbles, it will also happen when no foam is present
What position is the control valve to electronically raise the cab on 08’s?
Neutral position
How to properly stop the regeneration process on 08/09 seagraves?
Step on the brake pedal
How far shall the aerial ladder be off of a ledge
6 in
When placing OIT in manual mode what is the pre set %?
2.0
