ATSG FORD 4R100, Manual

Page: 6 / 120

AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
6
Copyright © 2003 ATSG
PTO "GENERAL" REQUIREMENTS:
RFF81P
-7006-
BA
Ford
Ford Ford
98
XW4P-A
C
RJL-B
00436
1
BD-9C
17
PTO
Window
Figure 5
(1) Obviously the case must be PTO capable with
the cast-in window in the transmission where the
PTO unit mounts to the transmission, as shown in
Figure 5.
(2) Designed for use during Mobile (Some Models)
or Stationary conditions.
Shift Solenoid 2 and the Coast Clutch Solenoid
must be energized when the PTO is turned ON.
(3)
PTO is available as an option only on 8500 GVW
or above, Super Duty F-Series trucks with 6.8L
Gasoline and 7.3L Diesel engines. Ford 4R100
transmissions on other models
are not PTO
capable.
(4)
(5)
Battery voltage must be supplied to the
Powertrain Control Module (PCM) input pin 4
on gasoline models, or pin 66 on diesel models,
when the PTO is engaged. The processor uses
this information to raise EPC pressure to
approximately 55 PSI so that you do not burn the
coast clutch.
This voltage must be provided by
the PTO installer.
"GENERAL" CONDITIONS FOR OPERATION
(1)
(2)
(3)
(4)
(5)
The vehicle is not in the crank or start mode.
The transmission range selector
must be in the P,
R, O.D, 2 or 1 position. The PTO will not operate
when selector is in the neutral position.
PTO operation is inhibited when in cranking
mode, neutral, or 4th gear.
Transmission only operates 1st through 3rd
gears. Computer strategy does not allow 4th
gear to engage, under
any conditions.
Transmission Fluid Temperature Sensor (TFT)
reading must be up to operating temperature.
Specific Operation For Diesel, See Page 7.
GASOLINE ENGINE PTO OPERATION:
(1)
(2)
(3)
(4)
PTO installer must obtain a "High Idle Throttle
Control" from an aftermarket source.
Auxiliary Powertrain Control Module seen on
Page seven,
does not work on the gasoline engine
models. APCM module works only on the 7.3L
diesel engine.
For stationary PTO operation an engine idle
speed of 1300 RPM is required.
The Torque Converter Clutch (TCC) engages
once the engine reaches 1300 RPM.
TRANSMISSION FUNCTIONS
DURING PTO OPERATION:
(1)
(2)
(3)
(4)
(6)
(5)
Shift Solenoid 2 and Coast Clutch Solenoids are
turned on, the coast clutch activates and does not
allow 4th gear operation during PTO operation.
Electronic Pressure Control (EPC) pressure is
raised to approximately 55 PSI. This is why the
coast clutch will be smoked in a short period of
time if a battery voltage wire is not supplied to
EEC input pin 4 (gasoline) or pin 66 (diesel)
when the PTO is engaged, as this rise in pressure
would not occur.
The Transmission Control Indicator Lamp
(TCIL) illuminates.
When the PTO is turned ON, the transmission
operates only in 1st through 3rd gears.
Overdrive 4th gear is not allowed by the PCM
strategy.
PTO operation can cause transmission fluid
temperature to exceed the recommended
maximum limit of 250 degrees F. Failure mode
logic within PCM strategy prevents transmission
damage by disabling the PTO above this
temperature limit.
The transmission shift schedule is early and shift
feel is very firm.