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Service Bulletin NTR SB 026 96
Magnum Hitch Diagnostic Codes and Service Manual update

Page 22 of 26

TESTING WIRING HARNESS AT THE 37 PIN AMP CONNECTOR

Rear of tractor

Draft pin spec.

Pin A to C  270 OHMS to 330
Pin B to C 175,000 OHMS to
Pin A to B 175,000 OHMS to

PIN NO.

11. Pin C of the RH draft pin sensor (supplies power to both pins).

33. Pin B of the RH draft pin sensor (signal input).
20. Pin A of the RH draft pin sensor (ground).

11. Pin C of the LH draft pin sensor (supplies power to both pins).
32. Pin B of the LH draft pin sensor (signal).

19. Pin A of the LH draft pin sensor, (ground).

34.
02.

12.

Pin C of the Hitch position rockshaft potentiometer (power).
Pin B of the Hitch position rockshaft potentiometer (signal).
Pin A of the Hitch position rockshaft potentiometer (ground).
See 

Testing hitch potentiometer on page 20.

See correction to wiring schematic on page 26.

OHMS

195,000

195,000

OHMS

OHMS

Cab floor

 I d 

 I , connector

  L O A D

P I N
S e n s o r

S e n s o r

Secondary control panel

H I T C H

24. Pin 4 = A of the Upper limit potentiometer (power).

14. Pin 5 = B of the Upper limit potentiometer (signal).

26. Pin 6   C of the Upper limit potentiometer (ground).

16. Pin 1 = A of the Drop speed potentiometer (power).

03. Pin 2 = B of the Drop speed potentiometer (signal).
35. Pin 3 = C of the Drop speed potentiometer (ground).

#102

23. Pin 7 = A of the Response speed potentiometer (power).

08. Pin 8 = B of the Response speed potentiometer (signal).
36. Pin 9 = C of the Response speed potentiometer (ground).

Potentiometer spec.

PIN A to PIN C
PIN A to PIN B
PIN B to PIN C

9,000 - 11,000 OHMS

0 TO 10,000 OHMS 

 %

0 to 10,000 OHMS 

 %

HITCH
UPPER LIMIT

#104

Содержание Magnum 7210

Страница 1: ...bration procedure This bulletin will cover the following items 1 General information page 2 2 General testing of the hitch system Reading and erasing error codes page 3 4 3 page 5 4 Hitch performance...

Страница 2: ...ay not show up as error codes The hitch must be recalibrated every time an hitch component is replaced or adjusted An empty hitch may move up slightly when the tractor is backed up if the load setting...

Страница 3: ...number JJA0064978 a Check battery and cab power stud located on cab floor RH console b Fuse 7 may be defective c Turn key ON and check pin 14 of the 16 pin connector for power d Bad ground to control...

Страница 4: ...ormation Electrically testing the hitch valve solenoid Disconnect the 16 pin connector from the hitch control module Test the hitch harness and solenoid resistance Solenoid spec 3 8 4 2 ohms 1 Raise s...

Страница 5: ...ve been recorded recorded first code will appear now A If any error codes have been I Toggle to UP position Toggle to DOWN position I Down momentary and release I c l Next error code Example only Repe...

Страница 6: ...responding to the various error code displays are HALT LIMP DEGRADED 2 and DEGRADED 1 each failure mode will generate different modes of operation as follows MODE OPERATIONAL HITCH FUNCTIONS HALT Hitc...

Страница 7: ...cuit failed i EEPROM failure The system cannot read calibrated values or errors HALT Tractor has not been calibrated Only appears when controller has been replaced HALT Calibrate hitch controller 1 Sh...

Страница 8: ...r El Relay primary or contacts problem Watchdog circuit problem High battery supply voltage Upper limit circuit failed Load control circuit failure 5 Both draft pin sensors failed or one draft pin sen...

Страница 9: ...er rest wire harness for damaged wires or connectors 4 Lamp circuit failure DEGRADED 1 Replace lamp lest wires to lamp for damaged wires or connectors DEGRADED 1 Capture the hitch and lower the hitch...

Страница 10: ...oller RAISE LOWER switch and position control failure LIMP Replace RAISE LOWER switch and Test position sensor wire harness Replace posrtion potentiometer Replace controller RAISE LOWER switch failure...

Страница 11: ...the test box at position 1 set D C voltage to 4 85 1 volts Adjust the hitch position pot in the console if needed See Service Manual 8009 8 steps 16 21 Test position pot Set the DVM to the 2 decimal...

Страница 12: ...full raise position Raise the hitch by pressing the hitch switch to the MOMENTARY position and releasing the switch The hitch position lever should still be in the transport position A 9 should appear...

Страница 13: ...sition 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...

Страница 14: ...low A Replace coil 0 B Battery voltage is very high B Test tractor battery circuit output Hitch valve null out of adjustment C Valve failure C Repair or replace hitch control valve Md A Operator did n...

Страница 15: ...r leaking 9 High pressure stand by not in spec 3 Hitch will not lower A B C D E F Perform Electronic Hitch Control troubleshooting Troubleshooting hitch system page 4 Hitch drop speed control set inco...

Страница 16: ...er If hitch leaks still leaks down go to step B Testing the hitch rockshaft cylinder and the cushion relief valve 1 2 3 4 5 Lower the hitch completely Disconnect the hitch supply line to the rockshaft...

Страница 17: ...S Pin B to pin C 3 8 4 2 OHMS If the plunger in the solenoid valve is off center to the right the hitch will drift up If the plunger in the solenoid valve is off center to the left the hitch will drif...

Страница 18: ...lockout plunger spool is not shifted or moved with oil pressure when the hitch is raised The piston pump oil pressure at the left end of the spool will unseat the load check poppet to raise the hitch...

Страница 19: ...isplay will not work on 7100 series 235010A1 ELIMINATING DRAFT CONTROL FROM THE MAGNUM TRACTOR Load pins draft control can be eliminated from the tractor by simply unplugging the draft pins and reprog...

Страница 20: ...ximately to 9 1 volts D C in the fully lowered position Note To completely lower the hitch the up down switch must be double clicked and held in the momentary position Note The over all range of the r...

Страница 21: ...Pin B of the Load control potentiometer signal Pin C of the Load control potentiometer ground See secondary control panel for potentiometer spec See page 22 Pin A of the Travel control potentiometer p...

Страница 22: ...al Pin A of the Hitch position rockshaft potentiometer ground See Testing hitch potentiometer on page 20 See correction to wiring schematic on page 26 OHMS 195 000 195 000 OHMS OHMS Cab floor I d b d...

Страница 23: ...lay To terminal A of the fender mounted hitch control switches POWER SUPPLY TRACTORS ABOVE SERIAL NUMBER JJA0064978 Turn key switch ON the ignition cab relay should provide power to fuse 7 If fuse 7 i...

Страница 24: ......

Страница 25: ...7 Terminal 87 of the EDC relay supplies 12 volt power to the following To pin number 14 of the 16 pin connector To terminal 30 of the hitch enable relay To terminal 5 of the up down switch To terminal...

Страница 26: ...date Page 26 of 26 CORRECTION TO WIRING SCHEMATIC The rockshaft position sensor wiring schematic is incorrect in the Service Manual schematic found in section 4002 page 27 See below for correction INC...

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