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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
page 2
page 3
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page 5
page 6
10
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page 11 - 12
page 13
14
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page 15
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page 19
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page
20
page
20
24
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page 25
page 25
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Summarization of Contents
General Hitch System Testing
Step 1: Initial Power-Up Check
Checks power and ground supply to hitch controller after key ON.
Step 2: Hydraulic System Testing
Tests hydraulic pressure, pump stand-by, and flow rates.
Step 3: Solenoid Electrical Testing
Tests hitch valve solenoid resistance using a multimeter.
Step 4: Raise Solenoid Hydraulic Test
Applies voltage to raise solenoid to test hitch valve operation.
Step 5: Lower Solenoid Hydraulic Test
Applies voltage to lower solenoid to test hitch valve operation.
Hitch Performance Codes
Normal Operation and Failure Modes
Explains normal codes and four failure modes: HALT, LIMP, DEGRADED 2, DEGRADED 1.
Diagnostic Codes (HALT Mode)
Lists HALT mode codes, their causes, and recommended solutions.
Diagnostic Codes (LIMP Mode)
Lists LIMP mode codes, their causes, and recommended solutions.
Diagnostic Codes (DEGRADED Modes)
Lists DEGRADED mode codes, focusing on sensor failures.
Performance Codes (DEGRADED 1)
Details performance codes indicating DEGRADED 1 operational status.
Performance Codes (LIMP Mode)
Lists performance codes indicating LIMP mode failures.
7200 Series Hitch Calibration Procedure
Pre-Calibration Requirements
Ensures components are in good order and hitch is free for movement.
Calibration Steps
Detailed procedure including test box, lever, and switch operations.
Testing Potentiometers During Calibration
Tests position and rockshaft potentiometers during calibration.
Hitch Diagnostic Codes During Calibration
Calibration Troubleshooting Chart
Lists calibration-specific codes, causes, and solutions.
Hitch Diagnostics by Problem
Hitch Will Not Fully Raise or Lower
Discusses issues when hitch fails to move to its limits.
Hitch Will Not Raise the Load
Covers problems with hitch's inability to lift a load.
Hitch Will Not Lower
Addresses issues when hitch fails to lower correctly.
Hitch Raises Slowly
Details reasons for slow hitch raising operation.
Hitch Leaks Down (Engine Off)
Investigates causes of hitch hydraulic leaks when engine is off.
Hitch Component Function and Troubleshooting
Hitch Valve Solenoid Function
Describes role and operation of the hitch valve solenoid.
Pilot Spool Function
Explains how the pilot spool controls hitch movement.
Control Spool Function
Details function of the control spool in hitch operation.
Lockout Plunger Spool Function
Explains lockout plunger spool's role in preventing unintended movement.
Testing Rockshaft and Position Lever Potentiometers
Position Potentiometer Testing
Tests position potentiometer using test box and DVM.
Rockshaft Potentiometer Testing
Tests rockshaft potentiometer using test box and DVM.
Bench Testing Potentiometers
Bench tests potentiometer resistance and continuity.
Testing Wiring Harness at the 37 Pin Connector
Position, Load, and Travel Control Connections
Details pin assignments for position, load, and travel control potentiometers.
Wheel Speed Input Testing
Tests wheel speed input signal and MPH sensor resistance.
Draft Sensor and Rockshaft Connections
Tests draft pin sensors and hitch position rockshaft connections.
Secondary Control Panel Connections
Details pin assignments for secondary control panel components.
Testing Wiring Harness at the 16 Pin Connector
Controller Ground and Power Supply Testing
Tests controller ground supply and power sources for tractors below/above serial JJA0064978.
Up/Down Switch and Enable Indicator Light
Tests up/down switch inputs and enable indicator light.
Hitch Enable Relay and Hitch Solenoid Testing
Tests hitch enable relay, solenoid, and fender switches.
Testing Wiring Harness at the EDC Relay #6
EDC Relay Power Supply and Terminal Functions
Verifies EDC relay power supply and explains terminal functions.
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