Introduction and PMCS of M870A2 Semitrailer

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(No Transcript)
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Introduction and PMCS of M870A2 Semitrailer
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OVERVIEW

• Characteristics, Capabilities and Components
• Operator PMCS
• Special restrictions when coupled with the MK31
• Basic Issue Items (BII)
• Maintenance and Troubleshoot M870A2

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TERMINAL LEARNING OBJECTIVES

• Provided with an operational MK31 tractor with
  M870A2 semitrailer and references, operate the
  MK31 with M870A2 semitrailer to safely meet
  operational requirements with no injury to
  personnel or damage to equipment per the
  reference.
• Provided with operational, MK31 tractor and
  M870A2 semitrailer, equipment and references,
  identify major components and features of the
  M870A2 semitrailer, to safely meet operational
  requirements with no injury to personnel or
  damage to equipment per the references.

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ENABLING LEARNING OBJECTIVES

• Provided with an operational M870A2 semitrailer,
  equipment and reference, identify major
  components of semitrailer to safely meet
  operational requirements with no injury to
  personnel or damage to equipment per the
  reference.
• Provided with M870A2 semitrailer, equipment and
  references, identify characteristics of
  semitrailer, to safely meet operational
  requirements with no injury to personnel or
  damage to equipment per the references.

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ENABLING LEARNING OBJECTIVES cont.

• Provided with M870A2 semitrailer, equipment and
  references, perform operator maintenance task, to
  safely meet operational requirements with no
  injury to personnel or damage to equipment per
  the references.
• Provided with M870A2 semitrailer, equipment and
  references, perform preventive maintenance checks
  and services on semitrailer, to safely meet
  operational requirements with no injury to
  personnel or damage to equipment per the
  references.

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ENABLING LEARNING OBJECTIVES cont.

• Provided with M870A2 semitrailer, equipment and
  references, correctly identify special
  restrictions when coupled with the MK31 tractor,
  to safely meet operational requirements with no
  injury to personnel or damage to equipment per
  the references.
• Provided with M870A2 semitrailer, equipment and
  references, correctly identify basic issue items
  and purpose (BII) to safely meet operational
  requirements with no injury to personnel or
  damage to equipment per the references.

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ENABLING LEARNING OBJECTIVES cont.

• Provided with M870A2 semitrailer, equipment and
  references, perform operation of major components
  of semitrailer, to safely meet operational
  requirements with no injury to personnel or
  damage to equipment per the references.

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METHOD/MEDIA

• Lecture/Demonstration
• Practical Application

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EVALUATION

• Written Test
• Performance Test
• Safety

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Characteristics, Capabilities and Components of
M870A2/M870A2S
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Models of M870 Semitrailer

• Currently there are 4 models.
• M870A1 (Older with improvements over M870)
• M870A2 (Newer version with improvements)
• M870A2-S (Updated with ABS and suspension.)
• M870A2-E1 (Modified with many changes to
  transport wider/heavier loads)

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Purpose

• Only the M870A2 and M870A2-S pulled by MK31
  tractor will be taught and used during this
  course.
• The M870A2/M870A2-S Medium Heavy Equipment
  Transporter (MHET) semitrailer is designed to
  transport engineer equipment, tracked vehicles,
  wheeled vehicles, containerized cargo, and bulk
  cargo on highways and improved roads (graded
  gravel).
• Is not designed for off-road or cross country
  operation.

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Capabilities

• 3 prime movers authorized to pull the
  M870A2/M870A2-S semitrailer.
• LVS- The MK48/16
• M931A1- Can pull only M870A2/M87A2-S with
  operational restrictions.
• MK31/AMK31- Can pull the M870A2/M87A2-S using the
  2 inch kingpin with operational restrictions.

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Operational Restrictions

• Specific restrictions and requirements when using
  MK31 tractor to pull semitrailer.
• Kingpin must be changed to 2 inch kingpin.
• Fifth wheel slid all the way forward.
• Semitrailer coupled to MK31 prior to loading
• Landing legs are for storage only on empty
  trailer.

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Operational Restrictions cont.

• The gooseneck locked in upright position and
  landing legs deployed to connect to MK31 tractor.
• Semitrailer can only be loaded using rear ramps
  or Material Handling Equipment (crane or
  forklifts).
• Max weight on rear ramps is 30,000 lbs

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Operational Restrictions cont.

• Maximum towing weight of MK31 when towing
  M870A2/M870A2-S
• 70,000 lbs on paved roads
• 45,000 lbs on improved roads (graded gravel).
• Maximum cargo weight on M870A2/M870A2-S when
  using MK31
• 51,000 lbs (25.5 tons) for paved roads
• 26,000 lbs (13 ton) for improved (graded gravel)
  roads.

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Operational Restrictions cont.

• Maximum Vertical Kingpin Load.
• 32,000 lbs on paved roads
• 22,800 lbs on improved roads (graded gravel)
• Formula for calculating kingpin weight in TM.
• Maximum Operating Speed.
• Limited to 40 MPH at any time when using MK31
  tractor.

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LOCATION AND DESCRIPTION OF COMPONENTS AND
FEATURES OF M870A2
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Location and Description of Components

• Data Plates-
• Two located on gooseneck to provide loading and
  manufactures data.
• Gooseneck-
• Able to fold down for loading and unloading when
  using the LVS only.

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Location and Description of Components cont.

• Kingpin-
• Removable with two provided 3.5 in. for LVS and
  2 in. for MK31 stored in holder in tool box.
• Spare Tire Assembly-
• Located on gooseneck and used to hold spare tire.

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Location and Description of Components cont.

• Folding Outriggers.
• 16 permanent outriggers that swing out.
• Used for wider loads.
• Removable Outriggers.
• 8 removable rear outriggers.
• Stored in center storage compartment
• Used for wider loads.

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Location and Description of Components cont.

• Tiedown Points.
• D-rings - (22) Used to tie down loads.
• Cutouts - (22) Used with outrigger loads so
  tiedowns do not cross boards.
• Lifting Shackles - (4) Used to lift trailer or as
  tiedown points.

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Location and Description of Components cont.

• Rear Ramps.
• Fold down to load and unload equipment and
  vehicles
• Max weight under 30,000 lbs.
• Located on rear of semitrailer.

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Location and Description of Components cont.

• Lights.
• Amber clearance lights.
• Red clearance lights.
• Two combination stop, turn, taillight, and
  blackout lights.

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Location and Description of Components cont.

• Load Bed.
• Configured to load the following containers.
• 2 - 10ft ISO containers, or
• 1 20ft ISO container, or
• At least 3 but no more than 6 SIXCON containers
  and locks are available.

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Location and Description of Components cont.

• Wheel Covers.
• Has permanent welded steel decking over the
  wheels.

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Location and Description of Components cont.

• Tool Storage.
• Integrated tool box at rear of semitrailer for
  storage of tiedown chains, container ISO locks,
  and second kingpin.
• Two under deck storage bins for removable
  outriggers and miscellaneous equipment.

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Location and Description of Components cont.

• Hub-odometer.
• Located on left front wheel
• Records mileage of the semitrailer.
• Landing Legs.
• Used to support semitrailer when the gooseneck is
  raised and the semitrailer is empty.

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Location and Description of Components cont.

• Brake Controls.
• MK31 supplies semitrailer brake air pressure and
  control of semitrailer brakes.
• MK31 provides electrical connection for all
  lights.

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Operation of Components on M870A2
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Operation of Components

• Loading Ramps.
• Secured in the upright and stowed position.
• Hinge pin has spring to assist with lowering and
  raising.
• Able to be moved outward 3 inches or inward for
  narrow track width.
• Load limit of 30,000 lbs on ramps.

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• REAR RAMPS DOWN

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Operation of Components

• Air Brake System
• M870A2 and M870A2-S
• Equipped with air brakes
• Air pressure is provided by MK31
• Routed through supply (red) airline to service
  reservoir priority value, and then to the air
  reservoirs and spring brake chamber

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Operation of Components

• Anti-lock Brake System (ABS)
• Only the M870A2-S is equipped.
• Assists with controlling brakes during wheel
  lockup.
• Improves vehicle stability and control by
  reducing wheel lockup during braking.

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Operation of Components

• ABS Warning Light.
• Only M870A2-S has ABS warning light.
• Lets the driver know status.
• Normal for light to come ON and go OFF to perform
  bulb check.
• If Warning light comes on and stays during
  braking when vehicle is in motion, indicates a
  malfunction.

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Operation of Components

• Suspension System
• Air ride suspension consists of air springs,
  shock absorbers, and height control value.
• Air ride suspension depends on air pressure from
  MK31 to maintain ride height.
• Air pressure above 65 psi for system operation
• Brake protection value closes when air pressure
  drops below 65 psi.

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Operation of Components

• Suspension System cont.
• Air Springs
• Heavy rubber bags that hold air to support axle
• Axle stops attached to axles in case of air
  failure
• Shock Absorbers
• Used to dampen dynamic movements
• Equipped with limiting straps to prevent
  overextension

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Operation of Components

• Suspension System cont.
• Height Control Value (M870A2-S only)
• Activated by changes in position of center axle
  to maintain proper ride height.
• Suspension Drain Value
• Located on top of right rear air bag.
• Used to drain the air from system.

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Operation of Components

• Wheels and Hubs
• Equipped with hub pilot wheels, used to center
  the wheels.
• Hubs have ABS capability.
• Both wheels, inter and outer, held in place by
  one flange nut per stud.

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Operation of Components

• Lighting System
• Electrical power is provided by MK31
• Operates on a straight 24-volt system
• All lights are 24-volt lights
• Landing Legs
• Fold down landing legs provided.
• Used to support semitrailer when empty.

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Equipment Data

• Length 42 ft. 4 in.
• Width 8 ft.
• Height of Deck 3 ft. 6 in. (no load)
• Deck Dimensions
• Length 30 ft. 8 in.
• Width 8 ft.

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Equipment Data cont.

• Ground Clearance (payload)
• Frame Rail 1 ft. 10 in.
• Axle 1 ft. 2 ¾ in.
• Weights (Using MK31)
• Curb (no load) 19,600
• Maximum Cargo 50,400
• Gross Loaded (GVW) 70,000

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Equipment Data cont.

• Axle Type
• Non-Driving Tubular (M870A2)
• Non-Driving Tapered spindle (M870A2-S)
• Quantity 3
• Wheels
• Type Hub pilot
• Rim size 22.5X8.25
• Rim type Tubeless

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Equipment Data cont.

• Tires
• Quantity 13
• Size 255/70R22.5
• Air pressure.
• Highway 115 psi
• Improved roads 115 psi
• Electrical 24 volt

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Equipment Data cont.

• Speed
• Highway 40 MPH (max 35 ton load
  using MK31)
• Improved Roads (graded gravel)
• 40 MPH (max 22.5 ton load using MK31)
• Maximum operating speed limited to no more then
  40 MPH at any time.

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• COMPONENTS
• of
• END ITEMS
• AND
• BASIC ISSUE ITEMS

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Components Lists

• Components and accessories designed for use with
  the semitrailer are classified by one of three
  categories.
• COEI
• BII
• AAL
• Used to determine whether all items are optional,
  maintained by the using unit, or required to stay
  with the semitrailer.

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Components Lists cont.

• Components of End Items (COEI)
• Furnished with each End item
• Required replacements are responsibility of using
  unit.
• Components List consist of
• Outrigger, removable . 8 each
• ISO lock . 8 each
• ISO lock tool . 1 each
• Spare Tire .. 1 each

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Components Lists cont.

• Basic Issue Items (BII)
• Items supplied with initial issue and retained by
  unit.
• Minimal essential items required to operate
  semitrailer and perform emergency repairs.
• Listed Items must accompany semitrailer during
  operation and when transferred between accounts.

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Components Lists cont.

• Basic Issue Items cont.
• Binder, load 6 each
• Chain assembly, single leg 6 each
• Gage hose assembly, tire inflation,
• self contained with 30 ft
  hose 1 each
• Padlock set, keyed alike 1 each
• Wrench, handle, truck 1 each
• Wrench, socket 1 each
• 12 ton minimum hydraulic jack 1 each
• 1/2 x 20ft, grade 7 chain (M870A2-S only) 8
  each
• Ratchet binders (M870A2-S only) 8 each

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Components Lists cont.

• Additional Authorized List (AAL).
• Are not issued with the end item.
• May be requisitioned, as required, through the
  supply system by the using unit or holding
  organizations.
• Items do not have to accompany the semitrailer
  and do not have to be turned in with the
  semitrailer.

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Components Lists cont.

• Additional Authorized List (AAL).
• Binder, Load As required
• Chain assembly, single leg As required
• Flex adapter, grease gun 1 each
• Grease gun, lever operated 1 each
• Hammer, sledge 3 lb. 1 each

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• OPERATOR
• MAINTENANCE
• Of
• M870A2

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Operator Maintenance

• Specific maintenance that must be completed to
  keep semitrailer mission capable.
• Is required along with PMCS of semitrailer.

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Operator Maintenance cont.

• ELECTRICAL CONNECTORS.
• Cleaning.
• Disconnect power supply cable.
• Remove any build up of grease or dirt
• Remove protective cover from connector.
• Clean metal surfaces and allow to dry.
• Inspection.
• Inspect connector and pins.
• Notify maintenance of damage.

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Operator Maintenance cont.

• GLADHANDS AND AIRLINES
• Cleaning
• Remove any buildup of grease.
• Clean gladhands connecting surface, screen and
  rubber grommet.
• Allow parts to dry.

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Operator Maintenance cont.

• GLADHANDS AND AIRLINES cont.
• Inspection
• Inspect gladhands and airlines.
• Check rubber grommet and screen.
• Use a soapy water solution to check for air
  leaks.
• Notify maintenance if damage is found.

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Operator Maintenance cont.

• AIR RESERVOIR SERVICE CHECK.
• Turn off air supply and disconnect gladhands.
• Open drain cock.
• Connect gladhands.
• Turn on air supply and release prime mover
  parking brake.
• Check for air leaks. Notify maintenance if leaks
  are detected

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Operator Maintenance cont.

• SPARE TIRE ASSEMBLY
• Removal
• Remove retaining bolt assembly and retaining bar.
• With aid of an assistant, remove spare tire
  assembly.

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Operator Maintenance cont.

• SPARE TIRE ASSEMBLY cont.
• Installation
• With aid of an assistant, place the spare tire
  assembly onto the gooseneck.
• Align wheel assembly center hole with spare tire
  mounting plate.
• Install retaining bar and retaining bolt assembly
  and tighten.
• Notify maintenance for inspection and repair of
  defective tire.

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Operator Maintenance cont.

• TIRE ASSEMBLY
• Removal
• With aid of an assistant, remove spare from
  carrier.
• Ensure semitrailer is unloaded prior to jacking.
• Loosen lug nuts on the tire assembly. DO NOT
  REMOVE LUG NUTS AT THIS TIME.

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Operator Maintenance cont.

• TIRE ASSEMBLY cont.
• Removal cont.
• Place jack under rear tiedown point on same side
  as tire assembly to be removed.
• Jack trailer up.
• Always use jack stands or other field expedient
  means to support trailer.

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Operator Maintenance cont.

• TIRE ASSEMBLY cont.
• Removal cont.
• Place jack stand, dunnage, or other material of
  sufficient strength to support trailer.
• Remove lug nuts.
• With aid of assistant, remove outer tire
  assembly. (If removing only the outer tire
  assembly, omit next step).
• With aid of an assistant, remove the inner tire
  assembly.

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Operator Maintenance cont.

• TIRE ASSEMBLY cont.
• Installation.
• With the aid of an assistant, install inner tire
  assembly (If only the outer tire assembly is
  being installed, omit this step).
• With the aid of an assistant, install outer tire
  assembly. Be sure that the valve stem is
  opposite (180 degrees) from the inner valve stem

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Operator Maintenance cont.

• TIRE ASSEMBLY cont.
• Installation cont.
• Mark number next to the lug nuts in accordance
  with TM with chalk.
• Install lug nuts and tighten to 50 ft-lbs using
  the sequence marked on the wheel.
• Torque lug nuts to 450-500 ft-lbs using the same
  sequence.

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Operator Maintenance cont.

• TIRE ASSEMBLY cont.
• Installation cont.
• Check tire assembly for proper air pressure.
• Check alignment of tire assembly.
• Lug nuts should be checked for proper torque
  after the first 50 to 100 miles of operation.

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Operator Maintenance cont.

• TIRE ASSEMBLY cont.
• Installation cont.
• Remove jack stand. Lower trailer and remove jack.
• Recheck torque of lug nuts. Notify maintenance
  of tire change.
• Replace spare tire on carrier.

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Operator Maintenance cont.

• CAGING THE BRAKES.
• Manually releases the brakes in the event air
  supply has been lost or interrupted.
• Used only in extreme circumstances when
  semitrailer must be moved or towed.
• Releases brakes and prevents operation of braking
  system.
• Moved only under emergency circumstances.

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Operator Maintenance cont.

• CAGING THE BRAKES cont.
• The spring inside is under very high pressure.
  Do not attempt to loosen or remove the permanent
  clamp on the pressure side of the spring brake
• Failure to treat the spring brake chamber with
  caution may result in serious injury or death.

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Operator Maintenance cont.

• CAGING THE BRAKES cont.
• Chock semitrailer wheels.
• Remove the dust cover on brake chamber.
• Visually inspect the inside of the spring brake
  chamber for mud, sand, or dirt.

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Operator Maintenance cont.

• CAGING THE BRAKES cont.
• Remove nut and washer and remove caging bolt.
• If caging bolt will not engage properly, do not
  continue.
• Notify organizational maintenance.

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Operator Maintenance cont.

• CAGING THE BRAKES cont.
• Insert T-end of caging bolt into keyhole.
• Turn the caging bolt one quarter turn clockwise
  until the caging bolt contacts stops.
• Pull on caging bolt to seat it properly.
• The caging bolt is properly positioned when it
  cannot be removed by pulling straight out.

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Operator Maintenance cont.

• CAGING THE BRAKES cont.
• Place washer and nut onto end of caging bolt.
• Tighten the nut on the caging bolt.
• Visually check to ensure the service push rod is
  retracting into the spring brake chamber.
• Do not over torque the caging bolt assembly (35
  ft-lbs maximum).

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Operator Maintenance cont.

• CAGING THE BRAKES cont.
• When fully compressed and brakes are released,
  the threaded portion of caging bolt should extend
  2.5 to 3 in. beyond the nut.
• Brakes should remain caged until proper
  maintenance personnel can inspect brake system.
• Repeat procedures as necessary for remaining
  wheel positions.

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• PMCS
• and
• Troubleshooting

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PMCS

• Operator PMCS includes
• Adjustments
• Minor repairs
• Testing
• Minor parts replacement
• Required to maintain semitrailer in proper
  operating condition.

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PMCS cont.

• Conduct of PMCS.
• Maintains semitrailer in serviceable and
  operational condition.
• Perform PMCS per scheduled intervals.
• Observe all CAUTIONS and WARNINGS.
• Perform all checks according to TM.
• If item is not operational, use troubleshooting
  section.

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PMCS cont.

• During PMCS Guidelines
• Nuts, Bolts, Screws.
• Check for looseness, loose assemblies or missing
  fasteners.
• Welds.
• Look for loose or chipped paint, rust, or gaps
  where parts are welded together.

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PMCS cont.

• Electrical Leads and Connectors.
• Look for cracked or broken insulation, bare
  wires, and loose or broken connectors.
• Hoses and Tubes.
• Look for wear, damage, and leaks.
• Report broken or worn parts to maintenance.

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PMCS cont.

• Rust and Corrosion.
• Check for rust and corrosion.
• Check for dirt and salt build-up.
• Paint bare, exposed metal on the semitrailer.

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BEFORE OPERATIONS PMCS.

• CHASSIS.
• Visually inspect chassis.
• Any excessive wear, cracks, or damage render the
  trailer not available.
• Check rear loading ramps.
• Check rear tool box cover.
• Check rear tool box for water.

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BEFORE OPERATIONS PMCS.

• GOOSENECK.
• Inspect gooseneck hinge points.
• Any excessive wear, cracks or damage render the
  trailer not available.
• Inspect hinge pins.
• Any excessive wear, cracks or damage render the
  trailer not available.
• Inspect grease lube points.

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BEFORE OPERATIONS PMCS.

• KING PIN.
• Visually inspect kingpins.
• Any excessive wear, cracks, or damage render the
  trailer not available.
• LANDING LEGS.
• Check for damaged or missing parts.
• Bent or cracked render the semitrailer not
  available.

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BEFORE OPERATIONS PMCS.

• TIRES.
• Check tire pressure.
• Any tire flat, missing, or unserviceable render
  the trailer not available.
• Check tires for gouges, cracks, tread separation,
  and foreign objects lodged in tread or tire.
• Check spare tire assembly.

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BEFORE OPERATIONS PMCS.

• WHEELS.
• Check wheels for damage.
• Any wheel damaged or unserviceable render the
  trailer unserviceable.
• Check for debris or foreign objects lodged
  between wheels.
• Check lug nuts.
• Any lug nuts missing render the trailer not
  available.

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BEFORE OPERATIONS PMCS.

• HUB-ODOMETER.
• Inspect hub-odometer.
• Note mileage before operation and check
  periodically for proper operation.

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BEFORE OPERATIONS PMCS.

• AIR LINES.
• Check air hoses.
• Any air hose or glad hands missing or damaged
  render the trailer not available.
• Check glad hands.
• Visually inspect glad hand screens.
• Check glad hand seals.

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BEFORE OPERATIONS PMCS.

• SUSPENSION.
• Check for leaks in air bags, bent or damaged
  control rods, damaged or leaking shocks, and torn
  or damaged shock absorber limiting straps.
• Any components damaged or unserviceable render
  the semitrailer not available.
• Inspect suspension and related hardware for
  serviceability.

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BEFORE OPERATIONS PMCS.

• HUBS.
• Feel hubs for significant temperature variation.
  
• Excessive heat indicates worn wheel bearing and
  render the semitrailer not available.
• DECK PLANKING.
• Inspect planking.
• Check for missing or damaged bolts and fastening
  hardware

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BEFORE OPERATIONS PMCS.

• OUTRIGGERS.
• Check for proper operation of folding outriggers.
  
• Outrigger loads are prohibited if any outriggers
  or boards are unserviceable.
• Check removable outriggers.
• Check under deck storage area.

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BEFORE OPERATIONS PMCS.

• TIEDOWN POINTS.
• Check D-rings, chain slots, shackles, and ISO
  locks.
• Tiedown points, load binders, or chains not
  sufficient for proper securing of payload render
  the trailer not available.
• Check chains, load binders, and other tie downs.

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BEFORE OPERATIONS PMCS.

• AIR SYSTEM.
• Check operation of gooseneck lock cylinder, pins
  and gooseneck lock valve.
• Inoperative value or lock pins render the trailer
  not available.
• Check for leaks in air reservoir tanks.
• Any leaks evident render the trailer not
  available.
• Turn dump valve to open drain cocks on air
  reservoirs.
• Inoperative or leaking drain control renders the
  trailer not available.

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BEFORE OPERATIONS PMCS.

• AIR SYSTEM cont.
• Momentarily open dump valve to vent accumulated
  moisture.
• Turn dump valve back to close drain cocks.
• Inoperative or leaking value renders the trailer
  not available.
• Check for free movement of air hose connection.
• Check for leaks and proper operation of the
  suspension drain valve.

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BEFORE OPERATIONS PMCS.

• LIGHTS.
• Visually inspect for damaged parts or components.
  
• Inoperative brake or tail lights render the
  trailer not available.
• Check all brake, tail, blackout and clearance
  lights.

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BEFORE OPERATIONS PMCS.

• LANDING LEGS.
• Operate landing legs from in-use to stowage
  position to check for binding or other damage.
• If inoperable, use dunnage to support empty
  trailer.
• Check to ensure proper stowage.

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BEFORE OPERATIONS PMCS.

• BRAKES.
• Check for leaks in the air brake system.
• Any leaks evident render the trailer not
  available.
• Listen for air leaks at the gladhands, relay
  valve, and air reservoirs.
• Trailer brakes failing to hold or air leaks found
  render the trailer not available.

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BEFORE OPERATIONS PMCS.

• BRAKES cont.
• Actuate trailer brakes and check to ensure brakes
  at all six wheel positions lock.
• Inoperative trailer brakes render the trailer not
  available.

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DURING OPERATIONS PMCS.

• The following checks must be performed during
  operation of the semitrailer in addition to the
  before operations PMCS.
• CHASSIS.
• Visually inspect chassis for damaged or missing
  components.

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DURING OPERATIONS PMCS CONT.

• GOOSENECK.
• Inspect gooseneck hinge points.
• Inspect hinge pins.
• TIRES.
• Check tires for gouges, cracks, tread separation,
  and foreign objects lodged in tread or tire.

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DURING OPERATIONS PMCS CONT.

• WHEELS.
• Check wheels for damage.
• Check for debris or foreign objects lodged
  between wheels.
• Check lug nuts.

102
DURING OPERATIONS PMCS CONT.

• HUB-ODOMETER.
• Note mileage before operation and check
  periodically for proper operation. Ensure
  mileage is cumulative.
• AIRLINES.
• Check air hoses for cuts and breaks.

103
DURING OPERATIONS PMCS CONT.

• SUSPENSION.
• Check for leaks in air bags, bent or damaged
  control rods, damaged or leaking shocks, and torn
  or damaged shock absorber limiting straps.
• HUBS.
• Check wheel hubs immediately after road use.
• Feel hubs for significant temperature variation.

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DURING OPERATIONS PMCS CONT.

• LIGHTS.
• Check all brake/tail/blackout and clearance
  lights for proper operation and cleanliness.

105
AFTER AND WEEKLY OPERATIONS PMCS.

• All of the PMCS checks conducted during the
  before operations will be conducted during the
  after as well as the weekly PMCS on the
  semitrailer.

106

• OPERATOR
• TROUBLE SHOOTING
• MEASURES
• ON
• M870A2

107
OPERATOR TROUBLE SHOOTING

• Knowledge of key components and understanding
  their function will facilitate quicker and more
  accurate troubleshooting and identification of
  maintenance requirements.
• The troubleshooting guidelines are provided as an
  aid in locating and correcting problems that
  occur during operation of the semitrailer.

108
OPERATOR TROUBLE SHOOTING

• Perform inspection procedures in the order listed
  in TM for a particular item.
• The troubleshooting procedures in the technical
  manual should be used by the operator to find and
  apply proper corrective action.

109
OPERATOR TROUBLE SHOOTING

• ELECTRICAL SYSTEM.
• All lights inoperable.
• Check lights on prime mover.
• Check electrical connection at cable receptacle.
• Check connectors pins.

110
OPERATOR TROUBLE SHOOTING

• ELECTRICAL SYSTEM cont.
• One or more lights inoperable.
• Check for burned out or defective bulbs/lights.
• Check for broken lead wires or loose connections.
• Check light assembly for damage.
• Check for dirty or corroded connectors.

111
OPERATOR TROUBLE SHOOTING

• BRAKES.
• Brakes will not release.
• Check prime mover air supply.
• Check pressure in prime mover air supply.
• Check air line connection at gladhands.
• Check for dirty or damaged packing in gladhands.
• Check for open drain cock on air tank reservoir.
• Inspect air line connections for leaks.

112
OPERATOR TROUBLE SHOOTING

• BRAKES cont.
• Brakes Grab.
• Check for moisture in air reservoirs.
• Brakes fail to engage.
• Check control (service) airline connection.
• Check for dirty or damaged packing in the
  gladhands.
• Inspect control (service) airline.
• Check brake system hardware.

113
OPERATOR TROUBLE SHOOTING

• Antilock Braking System (M870A2-S Only).
• ABS light stays on.
• Refer to table 2-6 in TM for troubleshooting.
• Notify maintenance for further inspections and/or
  repairs.

114
OPERATOR TROUBLE SHOOTING

• SUSPENSION.
• Tires making contact with wheel well.
• Check suspension drain valve.
• Check height control valve for damage (M870A2S
  ONLY).

115
OPERATOR TROUBLE SHOOTING

• TIRES.
• Excessively worn, scuffed or cupped tires.
• Check tire pressure.
• Check for loose, cracked, or broken wheels.
• Check suspension system for damaged air bags and
  loose or missing hardware.
• Check axle for misalignment.

116
OPERATOR TROUBLE SHOOTING

• REAR RAMPS.
• Ramps will not raise or lower.
• Check ramp brace.
• Check hinge pin.
• Retaining bar cannot be installed.
• Check for damaged hinges, hinge pin, or ramps.
• Check for bent retaining bar.
• Check for damaged retaining lug, pin, or bar.

117
QUESTIONS
118
SUMMARY

• Characteristics, Capabilities and Components
• Operator PMCS
• Special restrictions when coupled to MK31
• Basic Issue Items (BII)
• Maintenance and Troubleshoot of M870A2