Questions and Answers
What does LHS stand for?
Load handling system
What is the forging water depth and time?
48 in and for 5 minutes
What is the operating range of the system?
300 miles with 154 gallons
What is the gross combination weight rating?
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What is the maximum speed of the vehicle?
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How many tires does the vehicle have?
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How many air reservoirs does the vehicle have?
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At what psi will a buzzer sound for the brake system?
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When does the high transmission pump indicator go off?
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At what pressure does the parking brake apply the brakes?
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What is the overspeed indicator threshold?
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At what rpm does the engine idle?
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How many batteries does the vehicle have?
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What does LHS overload indicate?
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What does the traction control switch do?
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What does PTO stand for?
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What does the low fuel indicator signal?
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What is the purpose of the LHS joystick?
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What is a flat rack in relation to LHS?
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What is the maximum rpm for loading and unloading?
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What is the limp home speed for LHS?
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What is the approach angle for the vehicle?
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What is the departure angle for the vehicle?
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How many tow eyes does the vehicle have?
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What is the brake system range?
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What does the suspension dump valve do?
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What is the battery voltage range for the LHS?
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How many gears does the transmission have?
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How many brake chambers are there?
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What is the tire pressure for highway conditions?
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What is the tire pressure for cross country (dry) conditions?
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What is the tire pressure for cross country (wet) conditions?
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What is the tire pressure for sandy terrain?
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What is the highway mode speed standard?
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What is the cross country (dry) mode speed standard?
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What is the cross country (wet) mode speed standard?
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What is the sandy terrain mode speed standard?
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What is the ABS?
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How many axles turn in the vehicle?
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What are the positions of the transfer case shift lever?
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What is the transmission operating temperature range?
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What is the maximum rpm downhill that should not be exceeded?
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How many container hooks are there?
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What is the height the LHS reaches?
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What is the sequence of transfer flat rack from truck to trailer?
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What are the steps for loading from trailer to truck?
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What must be checked to ensure the load is properly placed on the truck?
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What must you do before switching out of 8x8 mode?
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What must be done before climbing into the vehicle?
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What must be filled out before driving the vehicle?
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What is the order to engage the hydraulic system?
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Study Notes
Load Handling System (LHS) Overview
- LHS stands for Load Handling System, which is crucial for efficiently loading and unloading cargo.
- The LHS can operate in various environments with a maximum height of 22 feet 2 inches.
Vehicle Specifications
- Forging water depth capability is 48 inches for 5 minutes.
- The vehicle has an operating range of 300 miles with a fuel capacity of 154 gallons.
- Gross combination weight rating is 109,000 pounds.
- The maximum speed in 5th gear can reach up to 62 mph.
Mechanical Components
- The vehicle features 8 tires and 5 air reservoirs.
- An overload condition occurs with a payload exceeding 11 tons.
- PTO (Power Take Off) is essential for automotive functions and operational equipment.
- The transmission comprises 6 gears: 5 forward and 1 reverse.
System Indicators & Safety Features
- Brake system pressure must stay between 60 to 120 psi; a buzzer alerts if pressure drops below 65 to 75 psi.
- A low fuel indicator activates when fuel is below 1/8 of a tank.
- The parking brake engages if air pressure falls below 30 psi, ensuring safety.
- Over speed indicator sounds at 2450 rpm, and engine idle is maintained between 625 to 725 rpm.
Fuel and Power Management
- Battery voltage ranges between 24 and 28 volts; the system uses 4 batteries rated at 12 volts each.
Tire Pressures
- Tire pressure varies based on operating conditions:
- Highway: Front 60 psi, Rear 65 psi, Spare 100 psi
- Cross Country (Dry): Front standard 35 psi, Rear 45 psi, Spare 100 psi
- Cross Country (Wet): Front standard 20 psi, Rear 25 psi, Spare 100 psi
- Sandy Terrain: Front standard 20 psi, Sand tire 25 psi, Rear 25 psi, Spare 100 psi
Operating Modes & Speed
- Standard speeds vary by terrain, reaching up to 62 mph on highways and 20 mph in sandy terrain.
- Limp home speed is set at 10 mph for a maximum distance of 30 miles.
Miscellaneous Features
- Traction control switch has three settings: engage inter-axle differentials, off, and engage 8x8.
- The suspension dump valve controls the vehicle's air suspension inflation and deflation.
- The vehicle can tow a significant load, with tow eyes rated for 60,000 pounds each.
Operational Procedures
- Proper loading requires checks for loading locks and metal-to-metal contact on each side.
- Hydraulic systems must be engaged in the correct order: PTO switch on, mode selector, then joystick.
- Always maintain three points of contact when entering the vehicle for safety.
- Complete a dispatch form before operating the vehicle.
- A specific sequence must be followed for transferring a flat rack from the truck to the trailer: 1, 2, 3, 2.
- Unloading from the trailer to the truck follows the mantra: hook, lift, touch, load.
Transmission and Temperature
- The transmission operates optimally between temperatures of 160 to 220 degrees.
- Never exceed 2100 rpm when going downhill to prevent mechanical failure.
Additional Information
- The ABS (Automatic Braking System) is integrated for enhanced vehicle control.
- The transfer case shift lever has three positions: High, Neutral, and Low.
- Only the front two axles of the vehicle turn during operation for better maneuverability.
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This quiz features flashcards for the 88m M1120A4 Load Handling System, offering definitions and key specifications. Test your knowledge of critical terminology and operational details related to the LHS. Perfect for students and professionals in military vehicle operations.