•Incorrect fuel for climatic conditions.
•Incorrect engine oil viscosity forclimactic conditions.
Note:Some vehicles have a lifetime fuelfilter that is integrated with the fuel tank.Regular maintenance or replacement is notneeded.
Note:If these checks do not help youcorrect the concern, have your vehiclechecked as soon as possible.
Noise Emissions Warranty,Prohibited Tampering Acts andMaintenance
On January 1, 1978, Federal regulationbecame effective governing the noiseemission on trucks over 10,000 lb(4,536 kg) Gross Vehicle Weight Rating(GVWR). The preceding statementsconcerning prohibited tampering acts andmaintenance, and the noise warrantyfound in the Warranty Guide, areapplicable to complete chassis cabs over10,000 lb (4,536 kg) GVWR.
CATALYTIC CONVERTER
WARNING: Do not park, idle ordrive your vehicle on dry grass or otherdry ground cover. The emission systemheats up the engine compartment andexhaust system, creating the risk of fire.
WARNING: The normal operatingtemperature of the exhaust system isvery high. Never work around or attemptto repair any part of the exhaust systemuntil it has cooled. Use special care whenworking around the catalytic converter.The catalytic converter heats up to a veryhigh temperature after only a shortperiod of engine operation and stays hotafter the engine is switched off.
WARNING: Exhaust leaks mayresult in entry of harmful and potentiallylethal fumes into the passengercompartment. If you smell exhaustfumes inside your vehicle, have yourvehicle inspected immediately. Do notdrive if you smell exhaust fumes.
Your vehicle has various emission controlcomponents and a catalytic converter thatenables it to comply with applicableexhaust emission standards.
To make sure that the catalytic converterand other emission control componentscontinue to work properly:
•Do not crank the engine for more than10 seconds at a time.
•Do not run the engine with a spark pluglead disconnected.
•Do not push-start or tow-start yourvehicle. Use booster cables. See JumpStarting the Vehicle (page 190).
•Use only the specified fuel listed.
•Do not switch the ignition off when yourvehicle is moving.
•Avoid running out of fuel.
•Have the items listed in scheduledmaintenance information performedaccording to the specified schedule.
Note:Resulting component damage maynot be covered by the vehicle Warranty.
The scheduled maintenance items listedin scheduled maintenance information areessential to the life and performance ofyour vehicle and to its emissions system.
If you use anything other than Ford,Motorcraft or Ford-authorized parts formaintenance replacements or for serviceof components affecting emission control,such non-Ford parts should be equivalentto genuine Ford Motor Company parts inperformance and durability.
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GENERAL INFORMATION
WARNING: Exceeding these ratingsby overloading can cause componentfailure resulting in property damage,personal injury or death.
Fluid Temperature
If the operating temperature exceeds250°F (121°C), the rate of axle lubricationoxidation increases and shortens the lifeof the lubricant and seals, requiring axlelubrication changes to become morefrequent to preserve the axle. Do notconsistently run extreme pressure (EP)lubricants above 250°F (121°C).
Axle Conversions
WARNING: When operating aloaded vehicle, the driver must keep alladjustable axles on the ground at alltimes, supporting their share of thevehicle’s load. Failure to do so canoverload other axles, tires, wheels,springs, steering components, brakesand frames, resulting in early componentfailure, loss of vehicle control, possibleproperty damage and personal injury.
We do not recommend, or approve,performing axle conversions. However, weunderstand that, on occasion, others installaftermarket add-on axles on the truckchassis that allow operator control forweight transfer from other axles (such asair lift axles).
2-SPEED REAR AXLE (IF EQUIPPED)
WARNING: Never shift atwo-speed axle when descending asteep grade as this may cause loss ofvehicle control and result in personalinjury.
Note:Do not shift between ranges whenthe speed control is on.
A two-speed rear axle allows the driver toselect a low range for greater pulling powerand a high range for greater road speedand fuel economy. You can also use theseranges to provide extra steps betweentransmission shifts when driving on steepgrades or fuel economy may be factors.
Axle Shifting
Note:Do not shift the axle to LOW whenyour vehicle is moving. Use LOW when youdrive a fully loaded vehicle on a severe gradeor in congested traffic. Use HIGH for allnormal driving conditions with a lightlyloaded or partially loaded vehicle.
Note:The axle is set to HIGH by default.
To shift the axle between HIGH and LOWwith the vehicle stopped, place thetransmission in position N, then press andhold the button for two seconds.
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WHAT IS THE PNEUMATIC
LOCKING DIFFERENTIAL
The pneumatic locking differential can lockor unlock the differential when the vehicleis moving or stopped. The differential lockprovides full power to both wheels whenextra traction is required.
HOW DOES THE PNEUMATIC
LOCKING DIFFERENTIAL
WORK
If your vehicle is equipped with apneumatic locking differential:
•Power is transmitted to the oppositewheel should one of the wheels beginto slip.
•Raise both wheels off the ground if itbecomes necessary to operate onewheel with the vehicle stationary.
The differential can be locked or unlockedwhen the vehicle is moving at a constantspeed of less than 25 mph (40 km/h) andwhile the wheels are not slipping. Do notlock the differential when the vehicle istraveling down steep grades and tractionis minimal.
Note:Do not use the differential lock atvehicle speeds above 25 mph (40 km/h).
When the differential is locked, thevehicle’s turning radius increases causingundersteer.
The differential lock and differential locklight automatically disengage at speedsabove 25 mph (40 km/h). The differentiallock remains off until the vehicle isrestarted or the differential lock switch isturned off then back on.
PNEUMATIC LOCKING
DIFFERENTIAL PRECAUTIONS
WARNING: Exceeding any vehicleweight rating can adversely affect theperformance and handling of yourvehicle, cause vehicle damage and canresult in the loss of control of yourvehicle, serious personal injury or death.
WARNING: Failure to raise all drivewheels with this type of differential couldcause the vehicle to move unexpectedly,resulting in property damage, personalinjury or death.
WARNING: Sudden accelerationon slippery surfaces could cause thewheels to spin, the vehicle to turnsideways on a crowned road surface orin a turn, possibly resulting in loss ofvehicle control and personal injury.
SWITCHING THE PNEUMATIC
LOCKING DIFFERENTIAL ON
AND OFF
Press and hold the button on the dash toturn the system on or off.
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•Your load shifts due to improperretention, accident damage or theinherently mobile nature of some loads,for example, hanging meat, liveanimals or partially laden tankers.
•Your vehicle or load has an unusuallyhigh or off-set center of gravity.
•Your brakes are not properly adjustedor maintained.
•One side of your vehicle drops off thepavement at an angle that is too greatto be counteracted by a reduction inspeed.
To Maximize the Effectiveness OfStability Control
•Make sure that the weight of your loadis evenly distributed, from front to back,side to side and you secure it properlyat all times.
•Exercise extreme caution at all timeswhile driving and avoid sharp turns,sudden steering inputs or abrupt lanechanges at high speeds, particularly if:
•Hauling loads that can shift.
•Your vehicle or load has a high oroff-set center of gravity whenloaded.
•You are towing doubles or triples.
Electronic Stability Control Usage withTractor/Trailer
The electronic stability control system isdesigned to work with trailer air brakesystems. We do not recommend its usewith any other trailer brake system.
Electronic Stability Control and Towingwith Non-tractor Trucks (Straight orKick-up Frame)
Non-tractor trucks (straight or kick-upframe) with air brake electronic stabilitycontrol, should not be used for towing anytype of trailer.
Chassis Modifications
Stability control is specifically calibratedand validated only for your vehicle'soriginal configuration. If you alter yourvehicle's chassis components, for example,a wheel base extension or reduction, tagaxle addition or removal, a major bodychange such as conversion of a tractor intoa truck. Ford Motor Company is notresponsible for the performance of thestability control system if you modify anymajor components such as axle,suspension or steering system.
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LOAD LIMIT
WARNING: Do not exceedthe GVWR or the GAWRspecified on the SafetyCompliance Certification Label.
WARNING: Do not usereplacement tires with lowerload carrying capacities than theoriginal tires because they maylower the vehicle's GVWR andGAWR limitations. Replacementtires with a higher limit than theoriginals do not increase theGVWR and GAWR limitations.
WARNING: Exceeding anyvehicle weight rating limitationcould result in serious damageto the vehicle and/or personalinjury.
Every vehicle manufactured byFord Motor Company is suppliedwith information on the SafetyCompliance Certification Label,located on either the B-pillar orthe driver’s door edge, listing themaximum loading for the vehicle(GVWR), and its axle systems(GAWR) at the tire to groundinterface.
Example only:
Under no circumstances shouldyour vehicle be loaded in excessof the GVWR or GAWR. It is theoperator’s responsibility to ensurethat neither the axle capacities,spring capacities, tire capacitiesnor the vehicle rated GVWR isexceeded.
Unloaded or Lightly LoadedVehicles
WARNING: Whenoperating empty or lightlyloaded, sudden or hard brakingmay induce wheel lockup withloss of vehicle control and thepossibility of accident andserious injury, especially on wetor slippery road surfaces.
The braking system has beendesigned to safely stop yourvehicle when fully loaded to itsGVWR.
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We do not recommend performing, orapprove of, suspension conversions.However, we understand that, on occasion,others install aftermarket add-onsuspensions on the truck chassis that allowoperator control for weight transfer fromother axles (such as air lift axles).
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TOWING A TRAILER
WARNING: Do not exceedthe GVWR or the GAWRspecified on the certificationlabel.
WARNING: Towing trailersbeyond the maximumrecommended gross trailerweight exceeds the limit of thevehicle and could result in enginedamage, transmission damage,structural damage, loss ofvehicle control, vehicle rolloverand personal injury.
Your vehicle may have electricalitems, such as fuses or relays,related to towing. See Fuses(page 202).
Your vehicle's load capacitydesignation is by weight, not byvolume, so you cannot necessarilyuse all available space whenloading a vehicle.
Towing a trailer places an extraload on your vehicle's engine,transmission, axle, brakes, tiresand suspension. Inspect thesecomponents periodically during,and after, any towing operation.
Load Placement
To help minimize how trailermovement affects your vehiclewhen driving:
•Load the heaviest items closestto the trailer floor.
•Load the heaviest itemscentered between the left andright side trailer tires.
•Load the heaviest items abovethe trailer axles or just slightlyforward toward the trailertongue. Do not allow the finaltrailer tongue weight to goabove or below 10-15% of theloaded trailer weight.
When driving with a trailer orpayload, a slight takeoff vibrationor shudder may be present due tothe increased payload weight.Additional information regardingproper trailer loading and settingyour vehicle up for towing islocated in another chapter of thismanual. See Load Limit (page178).
You can also find information inthe RV & Trailer Towing Guideavailable at your authorizeddealer, or online.
RV & Trailer Towing Guide Online
http://www.fleet.ford.com/towing-guides/Website
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RECOMMENDED TOWING WEIGHTS
WebsiteMarket
https://www.fleet.ford.com/towing-guides/United States of America
https://www.fleet.ford.ca/towing-guides/Canada
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