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Various aspects of crane safety and operation, including topics such as load charts, work area diagrams, load moment indicators, wire rope requirements, crane setup considerations, power line safety, and the use of personnel platforms. It provides detailed information and guidelines on crane operations, maintenance, and safety procedures to ensure the safe and effective use of cranes in construction and other industrial settings. A wide range of crane-related topics, including load calculations, rigging, crane setup, power line hazards, and the use of personnel platforms, making it a comprehensive resource for crane operators, supervisors, and safety professionals.
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Load chart capacities distinguished in bald type, marked with an asterisk, in a shaded area, or above a bold line of the capacity chart are based on: (a) net capacity (b) dynamic loads (c) structural strength (d) tipping - Answer>>(c) structural strength The proper way to calibrate a boom angle indicator is: (a) Use a protractor (b) dynamic loads (c) boom up against the and set the indicator at 90 (d) boom up or down so boom is horizontal, and level than set - Answer>>(d) boom up or down so boom is horizontal, and level than set In what case is someone allowed to make modifications to the crane? (A) When the operator approves it (B) When a competent person approves it (C) When manufacturer approves it in writing (D) If crane was built before January 1978. - Answer>>(C) When manufacturer approves it in writing What would be the effect of moving the tipping axis closer to the cranes center of gravity? (A) Longer working radius (B) Greater stability
(C) Greater capacity (D) Reduced stability - Answer>>(D) Reduced stability Which of the following matches the appropriate load chart to a particular crane? (A) Serial number (B) Model number (C) Make of crane (D) Make & model number - Answer>>(A) Serial number A durable rating chart with legible letters and figures shall be provided with each crane and attached in a location accessible to: (A) The site safety supervisor (B) The lift director (C) The project engineer (D) The operator while at the controls - Answer>>(D) The operator while at the controls The lifting capacities listed in the load chart assume that: (A) the lift is to be performed under ideal conditions. (B) the crane may be out of level by 3%. (C) winds up to 15 mph may be present. (D) extreme temperatures may be present. - Answer>>(A) the lift is to be performed under ideal conditions. A "rough terrain crane set up on outriggers that is based on 85% tipping should have the tires: (A) on the ground. (B) lightly touching the ground. (C) inflated. (D) off the supporting surface. - Answer>>(D) off the supporting surface. Load charts are based on stationary loads, which are also known as:
(A) Net loads (B) Gross loads (C) Dynamic loads (D) Static loads - Answer>>(D) Static loads The capacities in a mobile crane's load chart are based on either structural or: (A) net capacities (B) speed (C) boom (D) stability - Answer>>(D) stability The values listed in the manufacturer's load chart show: (A) rated capacities. (B) duty cycle capacities. (C) gross loads. (D) net capacities. - Answer>>(A) rated capacities. Net capacity is: (A) manufactures load ratings minus capacity deductions. (B) net load minus gross capacity. (C) net load plus gross capacity. (D) capacity deductions minus gross capacity - Answer>>(A) manufactures load ratings minus capacity deductions. When determining the "gross load" the best method is: (A) calculate the approximate load weight. (B) use a load moment indicator. (C) guess the approximate load weight and add the rigging. (D) get an accurate load weight and add the rigging. - Answer>>(D) get an accurate load weight and add the rigging. The weights of load handling devices, such as load blocks, spreader bars, and slings are considered: (A) part of the load.
(B) in the work area diagram. (C) in the working range diagram. (D) considered in calculating the net load. - Answer>>(A) part of the load. Gross capacity is 10,300 lbs. total deductions are 7,622 lbs. What is the net capacity? (A) 2,678 lbs. (B) 2,568 lbs. (C) 2,688 lbs. (D) 3,678 lbs. - Answer>>(A) 2,678 lbs. Boom length is measured from the: (A) Base of the boom to the boom tip (B) Crane center pin to the boom tip (C) Center of the heel pin(s) to the center of the boom tip sheaves (D) Hoist drum to the boom tip - Answer>>(C) Center of the heel pin(s) to the center of the boom tip sheaves The boom angle indicator indicates the booms angle to the: (A) Crane (B) Horizontal (C) Vertical (D) Ground - Answer>>(B) Horizontal Load radius is defined as: the horizontal distance from the centerline of rotation to the centerline of the vertical ha line with: (A) no load on the hook. (B) the rated load suspended. (C) the rigging not Included. (D) 95% load on the hook. - Answer>>(B) the rated load suspended.
You are lifting directly under the hook. As you put tension on it and away from the crane. What caused the increase in load radius as should place? (A) Boom deflection (B) Change in the weather (C) Boom twist (D) Side loading - Answer>>(A) Boom deflection A crane that is set up properly should have the tires off the supporting surface and the blocking under the float pad should be: (A) In line with the outrigger beams (B) Sufficient to support the crane and the load (C) Sufficient to raise the crane (D) Sufficient to support the crane - Answer>>(B) Sufficient to support the crane and the load When a boom extension considered to be in its stowed position, it is (A) located on the deck of the crane. (B) located off of the crane. (C) pinned to the boom base section. (D) pinned to the boom tip section. - Answer>>(C) pinned to the boom base section. Crawler cranes produce the least amount of ground pressure is over the: (A) Front: (B) Comer (C) Rear (D) Side - Answer>>(D) Side What is the best source of information for determining boom tip height? (A) Working range diagram
(B) The maintenance manual (C) A capacity chart (D) A hook elevation maintenance system - Answer>>(A) Working range diagram What is the purpose of a work area diagram (chart)? (A) To show radius, tip heights, and boom angles (B) To map out the areas you will work in (C) To identify operational quadrants (D) To specify correct counterweight configurations - Answer>>(C) To identify operational quadrants On a telescopic boom truck crane with outriggers properly positioned, the "over front" area is (A) either side of the crane center line. (B) between the outer portions of the front tires. (C) determined by the crane manufacturer. (D) between the inner portions of the front tires. - Answer>>(C) determined by the crane manufacturer. When the load radius falls between the capacities listed in the load chart use the gross capacity for the next (A) longer radius. (B) use the gross capacity for the next shorter radius. (C) longer boom length. (D) shorter boom length. - Answer>>(A) longer radius. When the boom angle falls between the capacities listed in the load chart use the gross capacity for the next: (A) longer radius. (B) lower boom angle. (C) longer boom length. (D) shorter boom length. - Answer>>(B) lower boom angle.
When load weights are between the values listed in the load chart, the value that must be used is the: (A) lower at a longer radius (B) higher at a shorter radius (C) lower at a higher boom angle (D) higher at a higher boom angle - Answer>>(B) higher at a shorter radius A load moment indicator LMI) is a computer installed on cranes designed to: Provide the operator with information regarding the boom length, boom angle, boom tip height, working radius, rated load, and total calculated weight being lifted by the crane. The LMI also warns an operator when an overloading situation is about to occur. (A) TRUE (B) FALSE - Answer>>(A) TRUE A crane operator plans to lift a gross load that weighs 26,300 lbs. Based solely on the line pull of the crane being 6000 lbs, what are the minimum parts of line required to make the lift? (A) One (B) Two (C) Four (D) Five - Answer>>(D) Five Backward: on a truck mounted crane could be dangerous when the crane is working on rubber at maximum boom angle, minimum boom length: (A) Over the side at a minimum radius (B) Over the rear at a maximum radius (C) Over the side at a maximum radius (D) Over the rear at a minimum radius - Answer>>(A) Over the side at a minimum radius
Hydraulic cranes shall be equipped with holding valves to prevent boom lowering in the event of: (A) An overloading condition (B) A boom hoist brake failure (C) Hydraulic failure. (D) Electrical failure - Answer>>(C) Hydraulic failure. What is the sum of the following deductions? Block 1,350 lbs. Rigging = 55 lbs. Lifting beam = 200 lbs. (A) 1,805 lbs. (B) 1,605 lbs. (C) 1,500 lbs. (D) 1,55 lbs. - Answer>>(B) 1,605 lbs. What is the minimum number of wraps required by OSHA to remain the hoist drum? (A) 1 wrap (B) 2 wraps (C) 3 wraps (D) 5 wraps - Answer>>(B) 2 wraps It is important to know when lubricating wire rope that the lubricant must: (A) Not be applied prior to use. (B) Not hinder visual inspection. (C) Not be applied in direct sunlight. (D) Not be applied to regular lay wire rope. - Answer>>(B) Not hinder visual inspection. When replacing the hoist line on a crane, how do you determine the size or type of wire rope? (A) Measure the sheave size (B) Use manufacturer's operators manual or load chart (C) Measure the drum
(D) Measure existing wire rope - Answer>>(B) Use manufacturer's operators manual or load chart On running ropes showing any evidence of heat damage, or wear of the original diameter of the outsides of one individual wires you must: (A) Decrease safety factor (B) Report it to the maker (C) Report it to the supervisor (D) Remove the rope from service - Answer>>(D) Remove the rope from service The most commonly used rope for hoist lines is right regular lay (RRL). How many randomly broken wires must there be to remove a RRL wire rope from service? (A) 6 in one strand or 3 in one strand in one lay (B) 8 in one lay or 3 in one strand in one lay (C) 6 in one lay or 3 in one strand in one lay (D) 8 in one strand or 3 in one strand in one lay - Answer>>(D) 8 in one strand or 3 in one strand in one lay Breaking strength divided by the design (safety) factor equals: (A) Safe working Limit (B) Safe working Load (C) Safe working Level (D) Gross working load - Answer>>(B) Safe working Load According to OSHA 1926 Subpart CC, the term "must" is (A) recommended. (B) suggested. (C) possible. (D) mandatory. - Answer>>(D) mandatory.
Which load chart should an operator use when the outriggers on the crane are fully extended and the tires are not off the supporting surface? (A) The on rubber load chart (B) Duty cycle chart (C) The list chart (D) The fully extended and set chart - Answer>>(A) The on rubber load chart Based only on permissible line pull of 13,920 lbs, what is the maximum load that can be lifted with four parts of line? (A) 13,920 lbs. (B) 55,680 lbs. (C) 56,680 lbs. (D) 66,760 lbs. - Answer>>(B) 55,680 lbs. On a crawler crane operating with retracted crawlers the most unstable quadrant of operation is over the: (A) Front (B) Rear (C) Side (D) Corner - Answer>>(C) Side When operating a crane that does not have the telescopic boom sections extended equally, which of the sections would likely become overloaded: (A) Section A (B) Section B (C) Longest section (D) Shortest section - Answer>>(C) Longest section DOT requires an operator to pass a physical every 2 years, ASME requires a crane operator must pass a physical every: (A) 2 years (B) 3 years
(C) 5 years (D) 6 months - Answer>>(B) 3 years Boom angle and load radius is determined when the boom is: (A) Unloaded (B) Loaded (C) Fully extended (D) Partly extended - Answer>>(B) Loaded When working on outriggers, the only time they should be less than fully extended is when: (A) Working alongside the highway and cannot block a lane (B) There is a load chart for this operation (C) You are handling light loads (D) When there is not enough room to extend one all the way - Answer>>(B) There is a load chart for this operation When performing a pick and carry operation, an operator should keep the boom: (A) In line with the direction of travel (B) In line with the extended outrigger (C) Raised to the maximum boom angle (D) At a 0 degree boom angle - Answer>>(A) In line with the direction of travel Jib offset is usually referred to as the jib's angle to the boom, boom angle is referred to as the boom's angle (A) Horizontal (B) Jib (C) Vertical (D) Crane - Answer>>(A) Horizontal Cranes jibs are limited by boom angle, and their capacities are based on: (A) Stability
(B) Radius (C) Tip (D) Structural strength - Answer>>(D) Structural strength The capacities of a jib, fly or boom extension are usually limited by: (A) Boom angle (B) Boom tip reach (C) Outrigger pads (D) LMI - Answer>>(A) Boom angle When the jib offset is changed from 0 degrees to 15 degrees. If the boom angle remains the same the load radius will: (A) remain the same. (B) increase. (C) decrease. (D) decrease 1 ft. for each degree offset. - Answer>>(B) increase. What would be a concern when operating a crane secured to a barge? (A) ground pressure (B) trim list (C) length and width of barge (D) crane boom tip height - Answer>>(B) trim list According to ASME B30.5, what effect does the weight of a nonstandard attachment have on net capacity? (A) Add to the load ratings. (B) Does not affect the rated capacity. (C) Add to net capacity. (D) Deduct from the load ratings. - Answer>>(D) Deduct from the load ratings. When calculating net capacity, in most cases, a stowed jib is
(A) mounted to the boom tip (B) 25% of the effective weight of the jib. (C) treated as a deduction. (D) not treated as a deduction. - Answer>>(C) treated as a deduction. A crane has a jib installed on the boom tip which is not used, what weight must you deduct from the crane gross capacity to determine the net capacity? (A) Exact weight of the jib (B) Stowed weight of the boom (C) Effective weight of the jib (D) Estimated weight of the jib - Answer>>(C) Effective weight of the jib When lifting loads from the water, the operator should be aware that: (A) The current can change and cause the crane to tip (B) The brakes on the crane could get wet and slip (C) The load will increase when you pick the load from the water (D) A dynamic load can occur - Answer>>(C) The load will increase when you pick the load from the water When is it necessary to pull a rotation resistant wire rope out of service? (A) When the safety factor decreases (B) When you use a personnel platform (C) When there are 2 broken wires in 6 rope diameters (D) When there are 5 broken wires in one lay - Answer>>(C) When there are 2 broken wires in 6 rope diameters What is not a good location for crane setup? (A) Hard fill (B) Rock (C) Compacted fill
(D) Abnormalities, uncompacted soils, voids - Answer>>(D) Abnormalities, uncompacted soils, voids As wire rope wraps onto a hoist drum and the layers increase, the available line pull: (A) decreases (B) is not affected (C) increases (D) doubles - Answer>>(A) decreases To provide protection in the crane's work area, barricades MUST be erected in accessible areas within: (A) the equipment's rotating superstructure. (B) within the machinery housing. (C) within fall zone. (D) within maximum radius. - Answer>>(A) the equipment's rotating superstructure. Who is responsible to follow manufacturer specified procedures for assembly/disassembly of the crane? (A) Controlling Entity (B) Qualified Evaluator (C) Site supervisor (D) A/D director - Answer>>(D) A/D director According to OSHA 1926 Subpart CC, who has the responsibility of ensuring that the area needed to support the crane has been prepared adequately before crane operations begin? (A) Crane owner (B) Crane operator (C) Controlling entity (D) Qualified evaluator - Answer>>(C) Controlling entity Which factor is the most important to consider about site access? (A) Expected load weights
(B) Pontoon loading limits (C) Wind speed and direction (D) Compaction of access (approach) roads - Answer>>(D) Compaction of access (approach) roads What is the primary reason for using timber blocking or mats under the crane's float pads or crawlers? (A) To decrease applied ground pressure (B) To stop mud from entering wheels or crawlers (C) To prevent the crane from grounding out when working near power lines (D) To the outriggers or crawlers off the ground - Answer>>(A) To decrease applied ground pressure When blocking is used under the outrigger floats to support the crane, the blocking: (A) must have a surface area equal to the float surface area. (B) must have a surface area greater than the float surface area. (C) must be made of the same material as the float/pad. (D) must be smaller than the float size. - Answer>>(B) must have a surface area greater than the float surface area. What site condition must an operator be concerned about prior to setting up a crane? (A) Appropriate parts of line installed to make the lift (B) Soil stability must be sufficient (C) Qualified rigger is available on site (D) Qualified signal person is available on site - Answer>>(B) Soil stability must be sufficient Which negative effect takes place as a result of loosely spaced cribbing (span blocking)? (A) Increased rated capacity of the crane. (B) Decreased rated capacity of the crane. (C) Increased ground bearing pressure.
(D) Decreased ground bearing pressure. - Answer>>(C) Increased ground bearing pressure. A luffing jib requires (A) a load indicator. (B) hydraulic holding valves. (C) a boom point elevation device. (D) a limiting device. - Answer>>(D) a limiting device. Mats are commonly assembled using 12x12 timbers between 10 and 40 long, they are used to better distribute ground pressure and are fastened together using: (A) Glue (B) Bolts (C) Solder (D) Staples - Answer>>(B) Bolts The only time that outrigger beams may be less than fully extended is when: (A) A structure blocks you from extending them completely. (B) You are lifting over the retracted outrigger beam. (C) The manufacturer's procedures permit. (D) You are lifting over the extended outrigger. - Answer>>(C) The manufacturer's procedures permit. During crane set up when an operator extends the cranes outriggers, the operator should: (A) check tire pressure. (B) make visual contact with the outriggers or post a signal person. (C) sound the horn. (D) place all blocking on the ground - Answer>>(B) make visual contact with the outriggers or post a signal person.
Float pads must be at a 90 degree angle and latched to the jack when the crane is set up for a lift and when: (A) disassembling (B) when performing a pick and carry operation (C) working on rubber (D) the outriggers are in use - Answer>>(D) the outriggers are in use Examples of a duty-cycle operation high speed steel erection, magnet operations, clamshell operations and: (A) the handling of personnel platforms. (B) high volume concrete placement. (C) multi drum operations. (D) pile driving. - Answer>>(B) high volume concrete placement. When operating a crane or boom truck, and the built level indicator is unusable the level should be placed on the upper- works or the: (A) Turret (B) Control station (C) Bed (D) Rotator bearing - Answer>>(A) Turret To level a crane property, set a carpenters level on the turn table or the upper works, level the crane to within 1%, then swing the crane: (A) 90 degrees and recheck level (B) Over the rear and (C) Over the front (D) 180 degrees and recheck level - Answer>>(A) 90 degrees and recheck level If a crane is not set-up level and the operator swings a load from the high side to low side, the load radius will:
(A) Increase (B) Decrease (C) Stay the same (D) Increases two feet for every one-degree out of level - Answer>>(A) Increase Side loading may be caused by: (A) Starting or stopping the swing too rapidly (B) Increasing the load radius (C) Raising or lowering the boom too rapidly (D) Raising or lowering the load too rapidly - Answer>>(A) Starting or stopping the swing too rapidly According to OSHA 1926 Subpart CC, who may perform a shift inspection on a mobile crane? (A) A practical examiner (B) An A/D Director (C) A competent person (D) A qualified person - Answer>>(C) A competent person According to OSHA 1926 Subpart CC what must be included in a monthly inspection? (A) Yearly Inspection (B) A new hoist line (C) Outrigger report (D) Documented shift inspection - Answer>>(D) Documented shift inspection According to OSHA 1926 Subpart CC, which of the following is included in a crane shift inspection? (A) Warning decals (B) Ground conditions (C) Leaking exhaust (D) Hydraulic valves - Answer>>(B) Ground conditions
When inspecting the boom on a telescopic boom crane which item should be inspected? (A) Float pads (B) Wear pads (C) Counterweight (D) Load block sheaves - Answer>>(B) Wear pads Hoist lines that are not in use hanging below the boom tip are usually considered a deduction. When would hoist line not be considered a deduction? (A) when it's reeved over the main boom tip (B) when it's reeved over the auxiliary boom head (C) when it's on top of the boom (D) when reeved over the jib - Answer>>(C) when it's on top of the boom When a crane operator leaves the crane, the operator must first: (A) Disengage the PTO (B) Turn the engine off (C) Land all suspended loads (D) Secure the area and lock out the controls. - Answer>>(C) Land all suspended loads Cranes operating with long booms should be most concerned with winds coming from the: (A) Rear of the boom (B) Side of the Boom (C) East (D) South - Answer>>(B) Side of the Boom According to OSHA 1926 Subpart CC which of the following is prohibited with wire rope on a crane? (A) Splicing (B) Cutting (C) Severing
(D) Lubricating - Answer>>(A) Splicing Hand signals must be posted conspicuously: (A) In the vicinity of hoisting operations (B) In the drivers cab of the crane (C) In the office. (D) In the load chart - Answer>>(A) In the vicinity of hoisting operations Power lines would be a big concern when considering a crane's set up location, another big concern could be? (A) Radio communication with signal person (B) Capacity of the crane (C) Gang members, crack heads, & tweakers (D) Voids, tanks, loose fill, & depressions - Answer>>(D) Voids, tanks, loose fill, & depressions Load chart capacities distinguished in bald type, marked with an asterisk, in a shaded area, or above a bold line of the capacity chart are based on: (A) net capacity. (B) dynamic loads. (C) structural strength. (D) tipping. - Answer>>(C) structural strength. The proper way to calibrate a boom angle indicator is: (A) Use a protractor (B) Ask the master mechanic (C) Boom up against the and set the indicator at 90° (D) Boom up or down so the boom is horizontal and level than set the indicator a 0 deg - Answer>>(D) Boom up or down so the boom is horizontal and level than set the indicator a 0 deg In what case is someone allowed to make modifications to the crane?
(A) When the operator approves it (B) When a competent person approves it (C) When manufacturer approves it in writing (D) If crane was built before January 1978. - Answer>>(C) When manufacturer approves it in writing What is the acceptable maximum number of broken wires at an end connection before standing wire rope must be replaced? (A) 1 (B) 2 (C) 3 (D) 6 - Answer>>(A) 1 What affect does loosely spaced cribbing have on a crane and its float pads? (A) Increased strength and stability (B) Increased strength and capacity (C) Decreased stability and strength (D) Decreased leverage - Answer>>(C) Decreased stability and strength One purpose of a load moment indicator is to: (A) reduce the load on the boom. (B) warn the operator of an overload condition. (C) reduce the load on the load block. (D) indicate the anticipated boom deflection. - Answer>>(B) warn the operator of an overload condition. According to ANSI B30.5, The minimum distance the flange of the drum shall extend over the top layer of wire rope is: (A) ½ in. (B) 1 in. (C) 3 in. (D) 4 in. - Answer>>(A) ½ in.
How does the operator verify that the operator's aid readings for boom length, load radius, and boom angle are accurate? (A) Check the site survey (B) Actual measurement (C) No need to verify (D) Calibrate the LMI - Answer>>(B) Actual measurement When is it permitted to bypass the Load Moment Indicator LMI? (A) When you are working under 110% capacity (B) When you are not performing a critical lift (C) During assembly and disassembly (D) Never - Answer>>(C) During assembly and disassembly Rigging components, blocks, hooks, and other lifting equipment on a crane is considered part of the (A) net capacity. (B) dynamic load. (C) gross capacity. (D) gross load. - Answer>>(D) gross load. All telescopic boom cranes are to be equipped with a load chart, a boom length indicator and: (A) An anemometer (B) A hook elevation maintenance system (C) A Drum rotation indicator (D) A Boom angle indica - Answer>>(C) A Drum rotation indicator Who is to give the operator hand signals? (A) The person(s) assigned prior to the lift (B) A competent person (C) A qualified person (D) The rigger - Answer>>(A) The person(s) assigned prior to the lift
When leaving telescopic boom cranes unattended overnight or for longer periods, the boom should (A) be positioned over the front of the crane with the swing brake set (B) be positioned over the rear of the crane with the swing brake set (C) have the swing lock engaged (D) be fully retracted and stowed. - Answer>>(D) be fully retracted and stowed. OSHA 1926 Subpart CC, requires hoist drum rotation indicator to be installed on cranes manufactured after November 8, 2011, (A) When the hoist drum is visible to the operator (B) When handling person platforms (C) When the hoist drum is not visible to the operator (D) On all mobile cranes - Answer>>(C) When the hoist drum is not visible to the operator A drum rotation indicator on a crane will tell the operator: (A) Line pull of the crane (B) Speed of the hoist drum (C) Capacity of the hoist drum (D) Direction and speed of the hoist drum - Answer>>(D) Direction and speed of the hoist drum What is the purpose of an anti-two block device? (A) To prevent the block or ball from contacting the boom tip (B) To prevent the block or ball from contacting the ground (C) To disable the function of telescope out (D) To disable the function of hoist up - Answer>>(A) To prevent the block or ball from contacting the boom tip What is the difference between an anti two-block warning device and an anti two-block prevention system?
(A) Warning device only warns, but prevention system will stop the operation (B) Both are the same (C) Prevention systems only warns, but warning device stops the operation (D) The prevention system is no longer used on telescopic cranes
Which of the following is a temporary alternative measure when a boom length indicator malfunctions? (A) Only operate the crane with basic boom. (B) Calculate boom length using radius and boom angle. (C) Mark the boom with measured marks to calculate boom length. (D) Mark the cable with measured marks to calculate boom length. - Answer>>(C) Mark the boom with measured marks to calculate boom length. According to ASME B30.5, what option provides guidance for an operator when a radius indicator becomes inoperative? (A) Must not operate the crane (B) Must use a dedicated spotter (C) Must measure radius (D) Must calculate boom length and angle - Answer>>(C) Must measure radius An audible outrigger/stabilizer alarm indicates (A) the outriggers/stabilizers are in motion (B) the boom truck is bin reverse. (C) the outriggers/stabilizer are overloaded (D) the boom truck is out of cable - Answer>>(A) the outriggers/stabilizers are in motion What function does the holding valve on a vertical outrigger jack perform? (A) Holds pressure in the vertical ram if a hydraulic connection fails. (B) Holds pressure in horizontal beam to prevent retraction. (C) Holds pressure in horizontal beam to prevent extension. (D) Holds the outrigger float against the vertical jack. - Answer>>(A) Holds pressure in the vertical ram if a hydraulic connection fails.