random truck q's Flashcards
Normal operating pressure of 4806
sec. relief valve
2900 psi
3150psi
Normal operating pressure of 4417
sec. relief valve
2750 psi
3100 psi
Normal operating pressure of 4105
sec. relief valve
2500 psi
2700 psi
type of hydraulic fluid used
shell tellus T22
The power steering hydraulic pump is _____ driven, coupled to the vehicles ______, it provides the flow and pressure to power the system. The steering wheel and _____ unit is assisted by the fluid pressure provided by the pump
Gear
Engine
Steering gear box unit
A _____ type water pump circulates engine coolant thru the oil cooler, ______, _______, and water manifold
centrifugal
cylinder block
cylinder head
Cool air is circulated thru the radiator by a suction fan which is _____ from the crankshaft
belt driven
overhead clearance to tilt the cab 4417 + 4806
15’ 8”
overhead clearance to tilt cab 4105
15’
Green indicator lights to show truck is inline within 30, 15 each side of center are located where
Cab dash
tiller dash
each stabilizer compartment
ladder extension, retraction system is accomplished thru _____ and ______
cables and double acting hydraulic cylinders
when the ladder is raised out of its bed/cradle the ______ sends a signal to interlock valve to prevent stabilizers from being operated
proximity switch
Outriggers will extend in _____ secs at idle, ______ secs with high idle switch on #4417
5 secs
3 secs w/ high idle on
With high idle switch on, RPMs increase, what does this do for aerial operations
Increase speed slightly and allow for multi function operation
The _____ shuttle valve is mounted directly to the _____ which in turn is mounted to the _______ housing
rotation
rotation motor
rotation gear box
Emergency overload warning horn and light will activate if:
a pressure switch closes in the bottom of the hoisting cylinders due to overloading the tip of the ladder (80% of max tip pressure) or over 80* of inclination
The light comes on and warning horn blows warning operator when ladder is overloaded, where are they located
Ladder overload light on top right (of all indicator lights) of pedestal
warning horn is inside pedestal (bottom R by foot)
When bedding the aerial, the bottom cylinder pressure should read ____ psi
0 psi
Steps for emergency hydraulic operation on 4417
Engine OFF Ignition ON Neutral Front Brake Main PTO ON PTO to EMERGENCY Deadman foot switch operate desired control lever switch on emergency pump toggle on pedestal Allow cool down periods between ops
To start 4417, 4806 at pedestal steps
Ignition ON
Engine start on pedestal
when front brake is on its engaging what
steering axles, front tractor and rear trailer
The aerials capacity is reduced for wind in excess of ____ mph or operation on a slope in excess of _____ degrees. 4806, 4417, 4105
20 mph
greater than 3.5* slope T11/T12
what is range of elevation for aerial on 4806
-5* to 80*
what is range of elevation for aerial on 4417
0* to 80*
What is nfpa standard for Testing aerial ladders
1914
If regen light is flashing with check engine light on how long till you must regen
Approximately 4 hours to regen or red STOP ENGINE light will illuminate, soot level 4 is reached and regen immediately or soot level will continue to rise and get locked out. Call robert
What type of hydraulic pump powers the entire hydraulic system
Positive displacement rotary vane pump, variable demand style. (Uses the amount of hydraulic fluid it needs)
Once aerial master is engaged on 4806 what is standby pressure until what happen
350 psi until outrigger control is operated and pump will produce the 2900 psi
what does deadman switch prevent a pedestal
prevents control levers from operating without deadman being depressed
what is function of the 2 hoisting counter balance valves
lock and hold the oil in the hoisting cylinders and only allow movement of the cylinders when control valve is operated
what valve is mounted on the extension cylinders? whats its function?
Pilot operated check valve
Locks and holds oil in the cylinders to prevent movement until control lever is operated
the flow of oil goes from the extension control valve thru what valves to get ladder extension
control valve to counter balance check valves to pilot operated check valves on the extension cylinders. CBV are set at slightly higher press. than pilot valve so they operate simultaneously
Ladder is in unsupported position means
what gauge shows this
its positioned OFF an objective
lower cylinder gauge
Steps for emergency hydraulic ops on 4806
Engine OFF Ignition ON Aerial Master Front brake Engage emerg. hydraulic switch Press deadman switch pull control valve activate emergency toggle switch allow cool down periods
If outriggers are not fully deployed (short jacked), the range of motion for aerial operations is
15* from center line of truck to the side thats short jacked, 180* ops to opposite side
There are ___ interlock control valves?
what is there operation
2
Stabilizer interlock- cant use outriggers if ladder is out of cradle
Turntable/aerial interlock- ladder wont operate without outriggers down and 800 psi of pressure
what is first # reading on ladder for extension distance
how far apart are they
51’
7’ apart
what outrigger goes down first when truck is not level
Low side
Outrigger goes up last when truck is not level
Low side
If inclinometer bubble shows it to the right side, which is side is low
Right side (low side is side of bubble)
Limitation of aerial if tractor is jackknifed 45-60, 4417
180* operation to side opposite the tractor is placed
Limitation of aerial if tractor is setup 45* or less, 4417
what do you need to do
360* operation
need to use overrides to get ladder out of cradle if over 15*
what are the different parts that make up the system that rotates the turntable
rotation shuttle valve is mounted to
rotation motor which is mounted to
rotation gear box assembly
weight limits of aerial 0-45*
250 lbs or 1000 gpm ladder pipe
weight limits of aerial at 60*
250 lbs on all 4 sections evenly spaced or
500 lbs on the tip
weight limits of aerial at 45-80*
250 lbs and 1000 gpm ladder pipe
aerial at 75-80* w/o water capacity
250 lbs on each section and 750 lbs at tip
Portable generator and amps on 4806
onboard generator
Honda 3000 25 amps
Onan 8000 67 amps
Portable generator and amps on 4417
onboard generator
Honda 3500 29 amps
Onan 7500 62.5 amps
Portable generator and amps 4105
onboard generator
Honda 2500 20 amps
Generac 7500 62.5 amps
onboard generator will shut down automatically when fuel is at
1/4 tank
Ring called on turntable that allows movement w/o twisting up all the lines
computator ring
What switches need to be engaged prior to leaving the cab for aerial ops on 4417
Neutral Maxi Front brake PTO Master switch (already on)
What switches need to be engaged prior leaving the cabe for aerial ops on 4806
Neutral Maxi Front brake Aerial master Master switch
How much rope in belay and life line bags
400’ static kernmantle
Upper beam is subject to ______ when aerial is in an unsupported position
tension
Lower beam is subject to ______ when aerial is in an unsupported position
compression
Length of each ladder section on the aerial is roughly how long?
31’ 6”
What is the pressure on lower cylinder gauge on 4417/ 4105 for overload warning horn and light to go off?
1950 psi
1850 psi
What is pressure on bottom cylinder gauge for ladder overload horn and light to activate on 4806?
1800 psi
what is emergency hydraulic pump
12 volt electric rotary vane positive displacement pump
Per nfpa the aerial’s height is measured how?
Measured at 80* from the top rung to the ground. Measures 100’ to the ground
Max slope for T11/T12
3.5 degrees
22 in over 30 ft
