2003 FORD F750 transmission

Removing key from ignition
•Turn the ignition key to position
2.
•Push the release lever forward
and rotate the key towards you
and remove.
Power-take off operation (PTO) with a manual transmission
Transmission-mounted power take-off units are available for local
installation on Ford vehicles. See your Body Builder’s Layout Book for
restrictions on use and installation of power take-off units.
To engage the PTO unit, stop the vehicle and place the transmission
control in neutral. Depress the clutch and allow the gears to stop
rotating, then engage the PTO unit. The PTO can also be selected with
the transmission in gear as long as the clutch is depressed.
When operating the PTO unit with the vehicle stationary, first set the
parking brake (chock the wheels if the vehicle is on a hill or other
unlevel surface).
BACKING UP
To avoid the possibility of personal injury while backing the
vehicle, always be sure your vehicle’s path is clear.
Before backing your vehicle, be sure you can do so safely. If anything
behind the cab limits your view, do not rely on mirrors alone to assure
that your intended path is clear. If other persons are in the vicinity, have
someone standing well behind the vehicle and outside your intended
path - visible through an exterior mirror - guide you as you back up.
Although OSHA or other governmental regulations may require use of an
electrical or mechanical back-up alarm to warn bystanders, such an
alarm does not assure that the intended path is clear.
Driving
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An electrical back-up alarm, if installed, is connected to the back-up
lamp circuit.
TWO-SPEED REAR AXLE
General Information
A two-speed rear axle allows the vehicle operator to selectLO rangefor
good starting and pulling power. The operator may also selectHI range
which allows for greater road speed and economy.
LO or HI range can also be used to provide additional steps between
transmission gear ratios when either gradeability or economy are a
driving factor.
Note:The two-speed rear axle should not be shifted while driving with
the speed control engaged.
Operation of the two-speed rear axle with a manual transmission
Split-shift sequence
Ratio
combination1234567891011
Transmission
gear1st 1st 2nd 2nd 3rd 3rd 4th 4th 5th 6th 6th
Axle range LO HI LO HI LO HI LO HI LO LO HI
Split-shifting upshift from LO to HI
•With the accelerator down, move the axle selector to HI by pulling the
selector up.
•Release the accelerator, then depress the clutch. Pause while the axle
upshifts, then release the clutch and depress the accelerator.
Transmission upshift and HI to LO axle
•Shift transmission to next higher gear.
•Move the axle selector to LO, by pressing the selector down, before
engaging the clutch.
Downshifting HI to LO axle
•With the accelerator down, move the axle selector to LO by pressing
the selector down.
•Rapidly release and depress the accelerator.
Driving
146

Transmission downshift and LO to HI axle
•With the accelerator depressed, move the axle selector to HI.
•Shift transmission to next lower gear. Repeat steps in sequence as
necessary.
Operation of the two-speed rear axle with an automatic
transmission
•Use LO range for when you drive
a fully loaded vehicle on a severe
grade or in congested traffic. To
activate LO range, press the
upper portion of the control
•Use HI range for all normal
driving conditions with a lightly
loaded or partially loaded vehicle.
To activate HI range, press the
lower portion of the control.
Note:You cannot split-shifting with an automatic transmission. Also,
downshifting above64 km/h (40 mph) may result in transmission or axle
damage.
Shifting the axle from LO to HI range - vehicle stopped
Place the transmission in N (Neutral), the press the lower part of the
control.
Shifting the axle from LO to HI range - vehicle moving
Accelerate to approximately 56 km/h (35 mph), press the lower part of
the control while the transmission is in N (Neutral), then release and
apply the accelerator.
Shifting the axle from HI to LO range - vehicle stopped
Place the transmission in N (Neutral), the press the upper part of the
control.
Note:Do not shift the axle to LO range with the vehicle in motion.
LOW
2SPD
Driving
147

Ratio extender use
Low End
A two-speed axle can be used as a ratio-extender when split shifting is
not necessary. For low end use, just shift the axle into the LO to start
out, and shift to HI when the extra torque is no longer needed.
Transmission (5-speed) 1st 1st 2nd 3rd 4th 5th 6th
Two-speed Axle Axle
LowAxle High
High End
To use the two-speed axle as a high end ratio-extender, stay in the LO
range for normal upshifts and only shift the axle to HI on the freeway for
greater road speed.
Transmission (5-speed) 1st 2nd 3rd 4th 5th 6th
Speed
Axle
High Two-Speed Axle Low for Gradeability
DRIVING THROUGH WATER
Do not drive quickly through standing water, especially if the depth is
unknown. Traction or brake capability may be limited and if the ignition
system gets wet, your engine may stall. Water may also enter your
engine’s air intake and severely damage your engine.
If driving through deep or standing water is unavoidable, proceed very
slowly. Never drive through water that is higher than the bottom of the
hubs (for trucks) or the bottom of the wheel rims (for cars).
Once through the water, always try the brakes. Wet brakes do not stop
the vehicle as effectively as dry brakes. Drying can be improved by
moving your vehicle slowly while applying light pressure on the brake
pedal.
Driving through deep water where the transmission vent tube is
submerged may allow water into the transmission and cause
internal transmission damage. Have the fluid checked and, if
water is found, replace the fluid.
Driving
148

Fuse/Relay
LocationFuse Amp
RatingPassenger Compartment Fuse
Panel Description
29 10A Cluster, GEM, 7.3L Power Stroke
PCM (clutch switch input), APCM
(7.3L Power Stroke only),
Overhead console (SuperCrewzer
only), Keyless entry module
(SuperCrewzer only), Traxx
(Fuel) module (SuperCrewzer
only)
30 30A 7.3L Power Stroke PCM diode,
7.3L Power Stroke fuel heater
31 15A Allison MD Transmission, Neutral
start relay and PCM (7.3L Power
Stroke only)
Relay 1—Interior lamps
Relay 2—Not used
Relay 3—Horn
Relay 4—One touch down power window
Relay 5—Not used
Power distribution box
The power distribution box is located in the engine compartment. The
power distribution box contains high-current fuses that protect your
vehicle’s main electrical systems from overloads.
Always disconnect the battery before servicing high current
fuses.
Always replace the cover to the power distribution box before
reconnecting the battery or refilling fluid reservoirs
If the battery has been disconnected and reconnected, refer to the
Batterysection of theMaintenance and specificationschapter.
Roadside Emergencies
155

The high-current fuses and relays are coded as follows.
Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box
Description
1 15A* Park lamps, Roof lamps
2 25A* Cummins Powertrain Control
Module (PCM)
15A* Foglamps (SuperCrewzer only)
3 10A* Generator
4 15A* Washer pump
5 15A* CAT air intake heater relay,
Cummins PCM
6 20A* CAT PCM, Cummins PCM
7 15A* Stop lamps
8 25A* CAT fuel heater
9 30A* Trailer hook-up lamps
(SuperCrewzer only)
10 15A* Shift modulator (Allison AT
transmission only) (except for
F–650 SuperCrewzer and
Caterpillar/Cummins)
503
304
303
302301
502
501
207201
202
203
204122118114110106102
121117113109105101
120116112108104
119115111107103
24
209206
208
18161412108642
1715131197531
205
23
22
21
401
20
19
Roadside Emergencies
156

Fuse/Relay
LocationFuse Amp
RatingPower Distribution Box
Description
11 20A* Allison MD transmission, Allison
2000/2400 transmission
12 10A* Keyless entry module
(SuperCrewzer only)
13 10A* Park brake adjustment module
(SuperCrewzer only)
14—Not used
15 7.5A* Body builder prep (hydraulic
brake vehicles only)
16 10A* Allison 2000/2400 transmission
(except F650 SuperCrewzer)
17 5A* Radio (SuperCrewzer only)
18—Not used
19—Not used
20—Not used
21 10A* GEM (hydraulic brake vehicles
only)
22—Not used
23—Not used
24—Not used
101 40A** Anti-lock Brake System (ABS)
(air brake vehicles only)
102 20A** Body builder prep run feed
103 50A** Ignition switch (Junction box
fuses 8, 9, 11, 19, 20, 22, 23, 24,
25, 29, 30, 31)
104 20A** Power point
105 20A** Power door locks
106 30A** Headlamps
107 50A** Junction box battery feed (fuses
1, 2, 3, 4, 12, 13, 14, 15)
108 40A** Cummins fuel heater
Roadside Emergencies
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Do not operate the starter longer than 30 seconds. Wait at least
two minutes between starting attempts to allow the starter to
cool. If the engine does not start after several attempts, call for
road service.
Removing the jumper cables
1. Remove the ground connection
from the disabled vehicle first,
followed by the cable on the
negative (-) battery terminal of the
booster vehicle.
2. Remove the cable from the
positive (+) terminal of the
discharged battery and then from
the positive (+) terminal of the
booster battery.
3. After the disabled vehicle has
been started, allow it to idle for a
while so the engine can“relearn”its
idle conditions.
WRECKER TOWING
Always unload your vehicle before towing it. The recommended method
of towing is with the drive wheels off the ground.
Before towing, make sure:
•the parking brake is released.
•if air pressure has been lost, to release the brakes manually.
Improper towing of the vehicle will not allow sufficient lubrication of the
transmission which may cause serious damage to internal transmission
components. Always follow the outlined towing procedures.
•To tow a vehicle on the front wheels,the steering wheel must be
in the straight ahead position. Secure the steering wheel with a
holding device (such as provided by a towing company).
42
3
1
Roadside Emergencies
164