Case Magnum 7210, Сервисный бюллетень

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Service
Bulletin NTR SB 026 96
Magnum Hitch Diagnostic Codes and Service Manual update
Page 13 of 26
HITCH DIAGNOSTIC CODE DURING CALIBRATION
A seven segment LED display will show codes that relate to
the performance of the Electronic Hitch Control system during
calibration. The one digit display will flash alternately from
H
to
failure code symbol. Note that there may be two types of
failures involved with the calibration process:
1. Unique system failures such as ‘hitch is not at maximum”,
or “command lever is not at minimum”.
2. Components failures, which are essential for the
calibration process.
In all cases, the calibration process will be aborted and the
hitch will transition into a HALT mode where hitch motion
cannot proceed. However, failures which are system failures
will be displayed using the codes in this document whereas
component failures will be displayed using the usual
operational diagnostic codes. Failures that exist during
calibration but are not essential to the calibration process, will
not cause any discontinuation of the calibration and will be
displayed using the usual operational diagnostic codes.
The following explains the conditions (failures) that exist in
the system when the following codes are displayed.
NOTE:
An
error code means
there
is a problem with the
component or some part of the circuit.
Example:
Loose
connection, bad wire, faulty component, etc.
CALIBRATION TROUBLESHOOTING CHART
NOTE:
All letter "H" codes will halt calibration.
Position command is not at
maximum.
Raise
PWM
(Pulse Width
Modulation) threshold is above
55%.
Raise
PWM (Pulse Width
Modulation) threshold is below
4%.
Full raise
current
detection
(100%
Pulse With Modulation) is
out of range.
Hitch Position
IS
not all the way
up.
SYMBOL
l
l
POSSIBLE CAUSES
SOLUTIONS
A Lever is not at maximum.
B Position command potentiometer
IS
bad.
C Position lever command is not set at
4.75
to 4.95 volts maximum.
D Position command potentiometer shaft
is loose from lever.
A Move lever to maximum.
B Replace position command
potentiometer.
C Adjust position
lever.
D
Tighten the lever onto the
potentiometer shaft.
A Coil resistance is very high.
B Raise driver does not connect to coil.
C Battery voltage
IS
very low or power to
coils is disconnected.
D Valve raise portion is stuck closed.
E Hitch valve null out of adjustment..
A
Replace coil.
B Test wire harness for continuity.
C Test tractor battery circuit output.
D Repair or replace hitch control
valve.
A Coil resistance is very low.
B Battery voltage is very high.
C
Valve failure.
D Hitch valve null out of adjustment.
E Center the hitch valve.
A Replace
coil.
B Test tractor battery circuit output.
C Repair or replace hitch control
valve.
A Battery voltage too high.
B Raise coil resistance too low.
D Center the hitch valve.
A Test tractor battery circuit output.
B Replace coil.
A Interference prevents hitch from
moving up.
B Position potentiometer failed.
C Position potentiometer is loose from
the lever.
D Position potentiometer out of
adjustmert.
A
Remove obstruction from hitch.
B Replace position potentiometer.
C Tighten the lever onto the
potentiomer shaft.
D Adjust position potentiometer.