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CASE nir
Binder: AG EQUIPMENT BINDER
Binder Section: AGRICULTURAL TRACTORS
Mach Loc Code: 40000
Issued By:
PRODUCT MANAGEMENT, RACINE, WISCONSIN, USA
Family: Magnum
Model: 7210,7220,7230,7240,7250
Subject: Magnum Hitch Diagnostic Codes and Service Manual Update
Background The following service bulletin will provide the dealer with more detailed troubleshooting
nformation on the Magnum 7200 series hitch system. The dealer should make a copy of this bulletin
and place in section 4002 page 45 or section 8009 of the 7200 series Service Manual.
Note: The hitch calibration procedure is found in the 7200 series Service Manual section 8009
O f Service Manual is no longer Correct.
Note: The 7100 and 8900 series tractor require a different calibration procedure.
This bulletin will cover the following items.
General information
1.
2. General testing of the hitch system ........................................................................
Reading and erasing error codes
3.
4. Hitch performance codes (during field operations) .................................................
5. 7200 series hitch calibration procedure
6. Hitch diagnostic codes (during calibration) .............................................................
7. Hitch diagnostics by problem..
8. Hitch component function and troubleshooting ....................................................
9. Hitch electrical component part numbers ...............................................................
10.. Eliminating load pins and draft control from the Magnum tractor .........................
1. Testing rockshaft and position lever potentiometers
1
12. Bench testing rockshaft and position lever potentiometers
13. Testing wiring harness at the 37 pin, 16 pin amp connector
14. Testing the EDC relay on tractors below serial number JJA0064978 ....................
15. Testing hitch enable relay
16. Correction to wiring schematic found in section 4002 page 27 ............................. page 26
SERVICE BULLETINS DO NOT CONSTITUTE WARRANTY AUTHORIZATION TO UPDATE UNITS
FILING INSTRUCTIONS
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Service
Bulletin
Page: 1 of 26
Document No.:
I
Supersedes:
Date Issued: 11/20/96
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................................. page 21
NTR SB 026 96
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Summary of Contents for Case Magnum 7250
- Page 1 CASE nir Service Bulletin FILING INSTRUCTIONS Binder: AG EQUIPMENT BINDER Page: 1 of 26 Binder Section: AGRICULTURAL TRACTORS Document No.: NTR SB 026 96 Mach Loc Code: 40000 Supersedes: Issued By: PRODUCT MANAGEMENT, RACINE, WISCONSIN, USA Date Issued: 11/20/96 Family: Magnum...
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Page 2: General Information
Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 2 of 26 GENERAL INFORMATION The following items should not be over looked when troubleshooting the Magnum hitch system. backwards “c” 1. A in the hitch diagnostic display means the control module is not calibrated. Do not replace the control module, perform calibration. - Page 3 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Set-vice Manual update Page 3 of 26 General testing of the hitch system 16 PIN STEP 1 Turn key “ON”. Connector The display on the hitch controller will do one of the following: A A.
- Page 4 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 4 of 26 STEP 2 Testing tractor’s hydraulic system there are no error codes and the hitch will not raise check the following items to determine the cause of the problem. or lower Check regulated pressure, spec 280 psi at 1800 engine rpm.
- Page 5 Toggle to UP position Down momentary Toggle to DOWN position and release Finished NOTE: Case Corporation reserves the right to make improvements in design or changes in specifications at any time without incurring any obligahon to install them on units previously sold.
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Page 6: Normal Operation
Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 6 of 26 ELECTRONIC HITCH DIAGNOSTIC CODES NORMAL OPERATION A seven segment LED display will show codes that relate the performance of the Electronic Hitch Control System. - Page 7 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 7 of 26 exist when the following codes are displayed. The codes listed from the highest priority to These are the conditions (failures) that the lowest priority. When more than one failure exists simultaneously the highest priority failure will be displayed. All failures are recorded in the controller (EEPROM) and can be retrieved in order of priority.
- Page 8 Service NTR SB 026 96 Bulletin Magnum Hitch Diagnostic Codes and Service Manual update Page 8 of 26 CODE CAUSE MODE SOLUTION Open, shorted, or misadjusted hitch position LIMP Test wire harness for damaged wires or circuit. connectors. Replace position potentiometer. Replace controller.
- Page 9 Bulletin NTR SB 026 96 Service Magnum Hitch Diagnostic Codes and Service Manual update Page 9 of 26 ELECTRONIC HITCH PERFORMANCE CODE SOLUTION CODE AUSE MODE litch RAISE/LOWER switch circuit failed. If the DEGRADED Replace RAISE/LOWER switch. wire harness for damaged wires or roblem intermittent the function is disabled until he next engine startup.
- Page 10 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 10 of 26 ELECTRONIC HITCH PERFORMANCE CODE NOTE: When the RAISE/LOWER switch and a second signal have failed the hitch can only be operated through the rear remote switches The following failure codes will appear: CODE CAUSE...
- Page 11 NTF? SB 026 96 Service Bulletin Magnum Hitch Diagnostic Codes and Service Manual update Page 11 7200 SERIES HITCH CALIBRATION PROCEDURE components and harnesses must be in good working order prior to calibration. The position control potentiometer must be set to 4.85 + 0.1 volts DC when the position control at its maximum height.
- Page 12 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 12 of 26 HITCH CALIBRATION PROCEDURE CONTINUED 9. Press the hitch switch to the MOMENTARY position and release. “11” should appear on the diagnostic display. Note: The control module is asking you if the tractor has an upper limit knob. 1 0 .
- Page 13 Bulletin NTR SB 026 96 Service 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 In all cases, the calibration process will be aborted and the hitch will transition into a HALT mode where hitch motion the performance of the Electronic Hitch Control system during calibration.
- Page 14 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 14 of 26 SOLUTIONS SYMBOL POSSIBLE CAUSES PROBLEM Move lever to minimum. Position command lever is not at Position command lever is not at minimum. minimum Replace position command Position command potentiometer...
- Page 15 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 15 of 26 HITCH DIAGNOSTICS BY PROBLEM 1. Hitch will not fully raise or fully lower A. Check hitch diagnostic display for error code after start up. B.
- Page 16 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 16 of 26 HITCH DIAGNOSTICS BY PROBLEM 8. Hitch raises slowly A. 1st remote valve is causing PFC pump to operate at high pressure stand by or is using all the PFC pumps hydraulic flow.
- Page 17 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 17 of 26 HITCH VALVE COMPONENTS AND FUNCTION PILOT PRESSURE INLET SPRING LEVER LOCK C PLUNGER SPOOL TO LUBE Hitch valve solenoid Moves the solenoid plunger. The solenoid plunger must be adjusted (centered) to prevent the hitch from drifting up or down when the solenoid is not powered.
- Page 18 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 18 of 26 HITCH VALVE COMPONENTS AND FUNCTION CONTINUED Control spool Raise - Once the control spool is shifted to the right it then directs PFC pump pressure to the left end of the lockout plunger spool (the lockout spool dose not move) but the pressure in that area will unseat the load check poppet to raise the hitch.
- Page 19 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 19 of 26 7200 SERIES ELECTRONIC HITCH COMPONENTS Control Module 112885A2 Up/Down rocker switch 113663A1 Enable replacement bulb 781991C1 Position control lever potentiometer 1000 ohms + 10% resistance pins A to C. 114255A2 Hitch rockshaft position potentiometer 1000 ohms + 10% resistance pins A to C.
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Page 20: Bench Testing
Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 20 of 26 TESTING ROCKSHAFT AND POSITION LEVER POTENTIOMETERS Position potentiometer Use the CAS - 1638 test box CAS 1897 in position 1 with adapter harness (black). decimal place range, do not perform test with the in the auto ranging mode. - Page 21 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 21 of 26 TESTING WIRING HARNESS AT THE 37 PIN AMP CONNECTOR 37 PIN AMP b CONNECTOR Pin NO. Pin C of the Position control lever potentiometer (ground). Pin B of the Position control lever potentiometer (signal).
- Page 22 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 Cab floor connector Draft pin spec. Pin A to C 270 OHMS to 330 OHMS P I N S e n s o r...
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Page 23: Pin Connector
Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 23 of 26 ARNESS AT THE 16 PIN AMP CONNECTOR TESTING WIRING 16 PIN CONNECTOR CONTROLLER GROUND SUPPLY- Clean battery ground input to controller, terminal 85 of the hitch enable relay and enable light. POWER SUPPLY (TRACTORS BELOW SERIAL NUMBER JJA0064978) Turn key switch “ON”, the EDC relay # 6 should turn “ON”. - Page 25 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 25 of 26 TESTING WIRING HARNESS AT THE EDC RELAY # Tractors below serial number JJA0064978 only. R E L A Y EDC RELAY POWER SUPPLY Turn key switch “ON”, the EDC relay # 6 should turn “ON”.
- Page 26 Service Bulletin NTR SB 026 96 Magnum Hitch Diagnostic Codes and Service Manual update Page 26 of 26 CORRECTION TO WIRING SCHEMATIC The rockshaft position sensor wiring schematic is incorrect in the Service Manual schematic found section 4002 page 27. See below for correction. INCORRECT CORRECT PIN K SHOULD GO TO A...
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