CHAPTER 07 · 2020. 8. 25. · CHAPTER 07 Tab ตัวอย่างการติดตั้ง: ติดตั้งแบบมีตัวรับพื้นโต๊ะและฉากรับ
Chapter 07
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Transcript of Chapter 07
Learning Objective 1
Discuss the basics of aerial device hydraulic systems.
7–2
Aerial Apparatus Driver/Operator
DISCUSSION QUESTION
Why is the apparatus stabilization process so critical?
7–3
Aerial Apparatus Driver/Operator
• When parked, somewhere along longitudinal midline of chassis, between front and rear axles
• When aerial device extended over front of apparatus, shifts toward front
• Shifts as aerial device is rotated
Center of Gravity
(Continued)
7–4
Aerial Apparatus Driver/Operator
• Prevent apparatus from tipping as aerial device is extended away from centerline of chassis
Stabilizers
7–12
Aerial Apparatus Driver/Operator
Explain transferring power to the hydraulic system.
Learning Objective 2
7–16
Aerial Apparatus Driver/Operator
• Must be engaged to deploy stabilizers and aerial device
• Engaged by activating power take-off (PTO) system
• Automatic transmission without fire pump
Aerial Hydraulic System
(Continued)
7–17
Aerial Apparatus Driver/Operator
• Manual transmission without fire pump
• Automatic transmission with fire pump in use
• Manual transmission with fire pump in use
Aerial Hydraulic System
7–18
Aerial Apparatus Driver/Operator
Transfer power to the hydraulic system of an apparatus equipped with a fire pump.
Objective 3 is measured in Skill Sheet 7-1.
Learning Objective 3
7–19
Aerial Apparatus Driver/Operator
Transfer power to the hydraulic system of an apparatus not equipped with a fire pump.
Objective 4 is measured in Skill Sheet 7-2.
Learning Objective 4
7–20
Aerial Apparatus Driver/Operator
• PTO engagement light is on• Wheels properly chocked• Stabilizers do not strike or land on
objects • Check stabilizers when they are in
place• Icy patches or frozen ground
Preliminary Checks
7–22
Aerial Apparatus Driver/Operator
• Operated once preliminary activities are successfully completed
• Provides hydraulic power to stabilizing system
• Located on rear step or midship on driver’s side
• Operation
Operating the Selector Valve
7–23
Aerial Apparatus Driver/Operator
• Ideal situation for stabilization• Maximum stability
Stabilizing on Even Terrain
7–24
Aerial Apparatus Driver/Operator
• Many are lever-type valves • Engine idle speed is regulated• When driver/operator operates
control, increase in engine speed occurs
• Rough and jerky operation should be avoided
Stabilizer Controls
7–25
Aerial Apparatus Driver/Operator
• Extend straight down • Fulcrum-types swing down into
position• Box types first extend outward and
then down
Positioning of Stabilizers
7–26
Aerial Apparatus Driver/Operator
• Extend parallel extension arms to their maximum travel distance
• Center portable stabilizer pads• Lower stabilizing jacks• Lower both stabilizers on one side• Lower stabilizers onto pads
Operation of Box Type Stabilizers
7–27
Aerial Apparatus Driver/Operator
DISCUSSION QUESTION
What is a good way to judge appropriate deployment of the stabilizers?
7–28
Aerial Apparatus Driver/Operator
• Lower stabilizers on the other side• Alternate between sides to raise
the vehicle to working position, as close to level as possible
Operation of Box Type Stabilizers
7–29
Aerial Apparatus Driver/Operator
• Similar to box-type• Exception – Should be lowered to
within a few inches of ground prior to the placement of stabilizer pads
Operation of Fulcrum-Type Stabilizers
7–32
Aerial Apparatus Driver/Operator
• Unavoidable in some situations• Lateral unevenness• Longitudinal unevenness
Stabilizing on Uneven Terrain
7–33
Aerial Apparatus Driver/Operator
• Avoided whenever possible
• Treat same as setting up on lateral incline
Stabilizing on Curbs or Other Obstructions
7–43
Aerial Apparatus Driver/Operator
Courtesy of Ron Jeffers
• Combination of hydraulic system holding valves and interlock feature
• Indicator light • Box-type stabilizers
Locking the Stabilizers
7–45
Aerial Apparatus Driver/Operator
• After use of aerial device is complete and it is returned to the bed
• Reverse of stabilization process• Prepares apparatus for departure
from the scene
Retracting the Stabilizers
7–47
Aerial Apparatus Driver/Operator
• Remove safety pins from jacks.• Return selector valve to
stabilization position.• Move wheel chocks.• Check around apparatus.• Raise stabilizers.
Procedure for Retracting the Stabilizers
7–48
Aerial Apparatus Driver/Operator
• Return selector valve to neutral position.
• Disengage PTO system.• Return stabilizer pads and stow
them in their appropriate storage location.
Procedure for Retracting the Stabilizers
7–49
Aerial Apparatus Driver/Operator
• Still in use on older apparatus• Similar to box-type hydraulic
stabilizers• Consist of extension arm that has a
screw jack attached to the end of arm
• Extension arm must be swung into position by hand
Manual Stabilizers
(Continued)
7–51
Aerial Apparatus Driver/Operator
• Placing stabilizers on midship aerials in service
• Placing stabilizers on tractor-trailer aerials in service
Manual Stabilizers
(Continued)
7–52
Aerial Apparatus Driver/Operator
Deploy, lock, unlock, and raise hydraulic stabilizers on even terrain.
Objective 9 is measured in Skill Sheet 7-3.
Learning Objective 9
7–55
Aerial Apparatus Driver/Operator
Deploy, lock, unlock, and raise hydraulic stabilizers on laterally uneven terrain.
Objective 10 is measured in Skill Sheet 7-4.
Learning Objective 10
7–56
Aerial Apparatus Driver/Operator
Deploy, lock, unlock, and raise hydraulic stabilizers on longitudinally uneven terrain.
Objective 11 is measured in Skill Sheet 7-5.
Learning Objective 11
7–57
Aerial Apparatus Driver/Operator
Deploy, lock, and then unlock and stow manual stabilizers.
Objective 12 is measured in Skill Sheet 7-6.
Learning Objective 12
7–58
Aerial Apparatus Driver/Operator
Discuss stabilizing the tractor-trailer aerial apparatus.
Learning Objective 13
7–59
Aerial Apparatus Driver/Operator
• Stability is given by manner it is parked and positioned at scene
• Creating an angle between tractor and trailer can increase stability
• Maximum stability occurs at 60 degrees
• Angles less than 60 degrees provide less stability
Stabilizing Tractor-Trailer Aerial Apparatus
(Continued)
7–60
Aerial Apparatus Driver/Operator
• Degrees 61 to 90 provide less stability
• Should never be positioned at an angle greater than 90 degrees
• Procedure for placing vehicle into angled position
Stabilizing Tractor-Trailer Aerial Apparatus
(Continued)
7–61
Aerial Apparatus Driver/Operator
Stabilize tractor-trailer aerial apparatus.
Objective 14 is measured in Skill Sheet 7-7.
Learning Objective 14
7–63
Aerial Apparatus Driver/Operator
Summary
• Because the suspension alone cannot support the outboard weight of an extended aerial device, effective stabilization methods must be used.
(Continued)
7–64
Aerial Apparatus Driver/Operator
• While the apparatus has built-in stabilization hardware, the driver/operator must understand the dynamics of weight transfer and use this understanding to optimize the positioning of the apparatus before stabilization is complete.
Summary
(Continued)
7–65
Aerial Apparatus Driver/Operator
• Aerial apparatus are manufactured by several different companies; therefore, it is important for the driver/operator to review the specifics of the stabilization system and its limitations by continual review of the operator’s manual.
Summary
7–66
Aerial Apparatus Driver/Operator
Review Questions
1.What may be the most critical aspect of preparing an aerial device for use?2.Why must apparatus stabilizers be set prior to deploying an aerial device?3. Why would a driver/operator use the practice of short-jacking?
(Continued)
7–67
Aerial Apparatus Driver/Operator
Review Questions
4.What is the purpose of the power take-off (PTO) system?5.What observations must be made by the driver/operator prior to deploying stabilizers?6. Why is stabilization ideally performed on even terrain?
(Continued)
7–68
Aerial Apparatus Driver/Operator
7.In what three ways may stabilizers move into position?8.In what ways can an apparatus be uneven?9. How is a manual stabilizer put into service on a midship aerial?
Review Questions
(Continued)
7–69
Aerial Apparatus Driver/Operator