2013 FORD F750 compressor

Engine Compartment (with Engine Stopped)
Engine OilUse the dipstick to verify the oil level is in the
proper operating range. SeeEngine oil checkin
theMaintenancechapter.
Engine CoolantLook through the plastic reservoir or the clear
sight glass on the reservoir (depending upon
vehicle equipment) and verify the coolant level is
within the proper operating range.Do not
remove the pressure cap until the coolant
has cooled.SeeEngine coolant checkin the
Maintenancechapter.
Power Steering
FluidVerify that the fluid level is in the proper
operating range. SeePower steering fluid check
in theMaintenancechapter.
Brake FluidRemove the master cylinder caps and inspect the
fluid level. SeeBrake fluid checkin the
Maintenancechapter.
Clutch FluidRemove the cap and inspect the fluid level. See
Clutch fluid and linkagein theMaintenance
chapter.
Belts (Fan,
Alternator, Water
Pump and A/C
Compressor)Inspect for glazing, fraying or cracking. There
should be no more than 5-7 cracks per rib, per
inch (2.5 cm).
Fluid LeaksInspect for signs of fluid puddles or dripping fluid
on the ground under the engine, or the underside
of the engine.
HVAC Air InletInspect for debris that may have collected on the
HVAC air inlet grille or inside the exterior module
as this may reduce system performance.
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Engine Starting (Parking Brake Applied)
Safety and
Emergency
Equipment•Before entering the cab, verify that the vehicle
is equipped with spare electrical fuses (if used),
three red reflective triangles, a properly charged
and rated fire extinguisher and wheel chocks.
•Walk around the vehicle and verify all steps
and grab handles, inside and out (as well as
behind), are tight and clean. Use extreme caution
and a three-point stance at all times.
•Inspect door latches for proper closing,
latching and locking.
Starting the
EngineSet the parking brake. If starting a vehicle with a
manual transmission, press the clutch and verify
the transmission is in neutral. If starting a vehicle
with an automatic transmission, make sure the
gearshift lever is in positionNorP(if equipped
with a park position).
Diesel engine:Turn the key to the on position.
Turn the key to start when the wait to start
indicator light in the instrument cluster turns off.
Gasoline engine:Turn the key to start, then
release it as soon as the engine starts.
Engine Oil
PressureVerify pressure builds to normal operating range.
Air Chime (If
Equipped with an
Air Compressor)The low air pressure warning chime should sound
immediately after the engine starts but before the
compressor has built-up pressure. The chime
should stop when the air pressure reaches 70 psi
(483 kPa) (or more). Let the air pressure build
to governed cut-out pressure, which should occur
between 115–130 psi (793–896 kPa).
AcceleratorPress the accelerator and verify that it operates
smoothly, without any binding or irregular feel.
Release the pedal and verify the engine returns
to idle speed immediately.
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2013 F-650/750(f67)
Owners Guide gf, 2nd Printing, March 2013
USA(fus)

Engine Starting (Parking Brake Applied)
Air BrakesVerify operation using the following procedure.
Chock the wheels, if necessary. Push in the
parking brake and, on tractors, push in the
tractor parking brake knob:
1. Verify the air compressor or governor cut-out
pressure is approximately 120 psi (827 kPa).
2. Turn off the engine, then turn the key back to
the on position (without starting the engine).
3. Without the brake pedal applied, note the air
pressure drop for one minute. It should be less
than 2 psi (14 kPa) for single vehicles and 3 psi
(21 kPa) for combination vehicles.
4. Press and hold the brake pedal with 90 psi
(621 kPa) or more. Make sure there is no more
than a 3 psi (21 kPa) per minute leak for single
vehicles and a 4 psi (28 kPa) per minute leak for
combination vehicles.
5. Pump the brake pedal to deplete the system of
air pressure. The warning light and chime should
activate at 57 psi (393 kPa).
6. Pump the brake pedal and make sure the
parking brake and trailer parking brake knobs
pop out at 20 psi (138 kPa) or higher.
Automatic
Transmission
FluidVerify that the fluid level is in the proper
operating range. SeeTransmission fluid check
in theMaintenancechapter.
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2013 F-650/750(f67)
Owners Guide gf, 2nd Printing, March 2013
USA(fus)

Recommended settings for cooling:
•Adjust the air distribution control to the A/C position.
If your vehicle is stationary for extended periods during extreme high
ambient temperatures:
•Select the MAX A/C position.
Gas engines:If your vehicle is stationary for long periods of time in
high ambient temperature conditions, your climate control system may
automatically switch from fresh air mode to recirculation mode. This is
normal system operation as it provides protection of the air conditioning
compressor (and related parts). It is recommended that you allow the
system to remain in this mode if it has switched. The system reverts
back to fresh air mode when conditions allow.
For maximum cooling performance, turn the air distribution control to
MAX A/C.
To aid in side window defogging/demisting in cold weather:
1. Select Panel/Floor.
2. Select A/C.
3. Adjust the temperature control to maintain comfort.
4. Set the fan speed to the highest setting.
5. Direct the outer instrument panel vents toward the side windows.
6. To increase airflow to the outer instrument panel vents, close the
vents located in the middle of the instrument panel.
HEATED MIRRORS (IF EQUIPPED)
Note:Do not remove ice from the mirrors with a scraper or attempt to
readjust the mirror glass if it is frozen in place. These actions could
cause damage to the glass and mirrors.
Note:Do not clean the housing or glass of any mirror with harsh
abrasives, fuel or other petroleum-based cleaning products.
Both mirrors are heated to remove ice, mist and fog when the heated
mirror button is pressed.
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2013 F-650/750(f67)
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USA(fus)

Anti-lock Brake System (ABS)
This system helps you maintain steering control during emergency stops
by keeping the brakes from locking.
The ABS lamp momentarily illuminates when the ignition is
turned on. If the light does not illuminate during start-up,
remains on or flashes, the ABS may be disabled and may need
to be serviced.
If the ABS is disabled, normal braking is still effective. If the
brake warning lamp illuminates, have your brake system
serviced immediately.
If a PLC trailer is connected when the ignition is switched on,
the trailer ABS light also illuminates. If the light fails to
illuminate, remains on after the vehicle is started or continues
to flash, have the system serviced immediately.
FULL POWER BRAKE SYSTEM
WARNING:If the red BRAKE warning lamp in the instrument
cluster remains illuminated after engine start up, this indicates a
system failure in the Full Power Brake System. Stop the vehicle safely
as soon as possible and seek service immediately.
This system incorporates standard braking, an anti-lock braking system
(ABS) and optional Power Park Brake into one fully-integrated hydraulic
brake system. With the Full Power Brake System, braking energy is
stored, similar to an air brake system, resulting in faster response times
and shorter stopping distances. This is accomplished using motor and
pump assemblies that pressurize the system by pumping brake fluid into
accumulators. This is similar to the air compressor of an air brake system
pressurizing the air tanks. The system includes a master cylinder that
provides the normal pedal feel and transfers the pedal force, via brake
fluid, to the main components of the system.
Note:The motor and pumps run momentarily with the ignition switch in
the on or run position, or in the off position with the brake pedal
pressed.
Note:During normal driving, the pump and motors may be heard
replenishing the accumulators. This is a normal function of the system.
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2013 F-650/750(f67)
Owners Guide gf, 2nd Printing, March 2013
USA(fus)

AIR BRAKES
After starting the engine, give the air compressor time to build up the air
pressure to 60 psi (414 kPa) before moving the vehicle.
WARNING:Do not drive or continue to drive if the low air
pressure buzzer is sounding or the brake warning light is lit.
These warnings indicate that air pressure is not to normal operating
level. Continued use of the vehicle could result in loss of braking ability.
WARNING:Avoid repeated light application of the brake pedal.
This depletes air pressure faster and could result in loss of
braking capability.
Periodically check the air pressure
gauge while driving. Pressure should
range between approximately
100–125 psi (690–862 kPa). The air
compressor governor cut-in and
cut-out pressure settings are set at
the factory and are not adjustable.
When air pressure is insufficient (below 60 psi [414 kPa]), a
warning light illuminates and a buzzer sounds when the ignition
is in the on position.
This condition may be caused by excessive brake applications depleting
the system air pressure. If this condition occurs, stop driving the vehicle
until the compressor has fully recharged the air system.
WARNING:Do not move the vehicle when the air pressure is
insufficient because the brake system may be inoperative.
Select a gear ratio to help slow your vehicle before descending grades.
Supplement with brakes as required to safely slow the vehicle and avoid
overspeeding the engine.
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Relay Center
The relay center is located along the passenger side A-pillar on the right
side of the footwell.
Relay
LocationRelay Description
R1 Spring applied hydraulic release warning chime module or
PCM power VPWR 2, 3 and 4
R2 A/C compressor clutch
R3 Power windows
R4 Flasher (standard/LED)
R5 Upfitter relay 1
R6 Upfitter relay 2
R7 Headlights
R8 Spare
R9 Upfitter relay 3
R10 Starter
R11 DCU (diesel engine only)
R12 Two–speed axle/Differential lock
R13 Door lock
R14 Air tank moisture valve
R15 DRL #1
R16 Heated mirrors
R17 Spare
R18 Upfitter relay 4
R1
R9 R10 R11 R12 R13 R14 R15 R16 R17
R18 R19 R20 R21 R22 R23 R24 R25 R26
R2 R3 R4 R5 R6 R7 R8
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USA(fus)

Some parts such as air brake chamber diaphragm, air compressor and air
cleaner should be inspected periodically and replaced if considered
unserviceable.
Air dryer:Climactic conditions affect performance of desiccant or
after-cooler type air dryers. Maintenance schedules must be established
for each specific operation.
The use of an air dryer on a vehicle does not eliminate the need to
periodically drain the air reservoirs.
Desiccant air dryer:Inspect for moisture in the air system by opening
reservoirs, draincocks or valves and checking for presence of water. The
presence of small amounts of water due to condensation is normal and
should not be considered as an indication that the dryer is not
functioning properly.
The desiccant cartridge should be replaced or rebuilt when it has been
determined that the desiccant is contaminated and does not have
adequate water absorption capacity. The desiccant change interval may
vary. It is generally recommended that the desiccant be replaced every
12 months (yearly). If experience has shown that extended or shortened
life has resulted for a particular installation, then the yearly interval can
be increased or decreased accordingly.
Draining the air brake reservoir:
Completely drain all the air brake
reservoirs daily by opening the
draincock at the ends of the tanks
(Where accessible. Pull-chains are
used when the drains are undercab
or otherwise inaccessible). Close the
draincock after draining. Air tanks
equipped with automatic moisture
ejector valves may also be drained
manually as required to maintain a
dry air system. Contact your dealer if you are unsure of the air reservoir
locations or the draining procedure.
WARNING:Failure to drain air brake reservoirs can result in a
reduction or loss of braking ability due to fluid accumulation in
the reservoir and/or possible freeze-up during cold weather.
210Maintenance
2013 F-650/750(f67)
Owners Guide gf, 2nd Printing, March 2013
USA(fus)