Chp 18

Question 1

Stabilizers

Answer 1

Aka outriggers, ground jacks, screw jacks
Post type (down riggers)
Box stabilizers (H stabilizers)
A frame (scissor, X style)

Question 2

Tfer power to hydraulics

Answer 2

Position app first
Engage PTO via switch in the cab (pneumatic 50-140 psi, electric, hydraulic or combo)
Which powers hydraulic pump
May need to turn off engine brakes
Hot shift means doing it in neutral (idle down if pump is already going). Can cause damage if not equipped

Question 3

Automatic tranny

Answer 3

Pg 647

Question 4

Setting stabilizers

Answer 4

First make sure area is good (officer and driver)
Engage PTO then
Preliminary checks
Selector valve
Stabilizing-even
Stabilizing-uneven

Question 5

Preliminary checks

Answer 5

Set front brake
Check PTO light is lit
Chock the wheels front and back, both sides
Check clearance for stabilizers:
-Other vehicles
-Utility poles
-Hoselines
-Fences
-Signs
-Personnel
Use pike pole or arm to test length
Don't put shoe on: large rocks, fire hose, tools, manholes, broken pavement
Check ground stability cribbing is a last resort

Question 6

Operate selector valve

Answer 6

Sends hydraulic to the stabilizers
Selector is rear step or midship
When moved to correct position, app is ready to sabilize

Question 7

Stabilizing-even terrain

Answer 7

Controls are usually rear step, some mid ship on both sides
Can do more than one at a time
They automatically adjust idle speed
With 4 jacks do front then back or side then side, never just one jack. 1 to ground, 2 halfway, 1 rest of way, 2 rest of way
For A frame can’t short jack and don’t place pads till a few inches off the ground

Question 8

Short jacking

Answer 8

Consult mfg

Question 9

Stabilizing-uneven terrain

Answer 9

Side to side can correct for 5*
Raise uphill side outriggers until contact is made
Then raise downhill until level
Better to deploy over the uphill side
Front to back is much worse because of torsion when deployed off the side.
Check mfg and deploy off front or back (back is better for articulating)
Use stabilizers to level as much as possible
May have load restictions (eg. 50%) when on grades

Question 10

Stabilizing on uneven surfaces

Answer 10

Avoid sidewalks, parking lots, manholes, unpaved roads, gravel
Reposition

Question 11

Stabilizing on ice

Answer 11

Ground can melt
Ice can melt leaving a gap
If grade, app can chatter or slide down with vibration-use wheel chocks and sand, not salt

Question 12

Locking stabilizers

Answer 12

Most have interlock if aerial is going, no fluid through the outriggers so they can’t really move
Most have indicator lights when interlock is on

Question 13

Retracting stabilizers

Answer 13

Bed ladder
Remove pins
Return selector valve to stabilization
Move chocks a little
Check around app
Raise and retract

Question 14

Manual stabilizers

Answer 14

Old midship and tillers most likely

Question 15

Stabilizing tillers

Answer 15

Park 60* offset, never more than 90 or damage may result

Put turntable at object, turn away from building and pull forward, turn tiller toward building and back up

Question 16

Center of gravity when parked, no outriggers

Answer 16

When parked and stowed its along the longitudinal midline between the front and rear axles
Base of stability is limited to the box made by the 4 tires (tires also squishy)
Use stabilizers even if only lifting the aerial a few feet

Question 17

Gravity circle

Answer 17

Circle traced by rotating center of gravity when aerial is deployed and rotating
If gravity circle stays in base of stability we are good

Question 18

Base of stability

Answer 18

Shifts with short jacking and slopes
Don’t rely on limit switches
Gravity circle expands if aerial is overloaded, especially at low angles