171
229042ABASJ46 AJ+, SJ46 AJ, SJ51 AJ
Electrical System - CE & AS Section 4 – Troubleshooting Information
4.3-13 Differential Lock will not Engage
NOTE
Differential Lock cannot be engaged if a drive function has been selected.
1. No output on pin #19 from valve driver to wire
#26A.
Check pin #19 for 12 volts when drive in neutral
position. If no voltage present make sure drive
joystick output “D” is between 4.2 and 4.8 volts.
2. Loose or broken wire #26A from valve drive pin
#19 to differential lock switch S28.
Check continuity. Replace if defective.
3. Loose or broken wire #165 from differential lock
switch S28 to plug A pin #24 in platform control
console.
Check continuity. Replace if defective.
4. Loose or broken wire #165 in Cable A or its
connectors.
Check for continuity between pins #24 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
5. Loose or broken wire #165 from base plug A pin
#24 to base terminal block.
Check continuity. Replace if defective.
6. Loose or broken wire #165 or #02 from base
terminal block to differential lock valve 3H-165.
Check continuity. Replace if defective.
7. Defective differential lock valve coil 3H-165. Check continuity and resistance through coil.
Replace if defective.
4.3-14 Differential Lock Engages Momentarily but will not stay Engaged
NOTE
Differential Lock will engage without light being illuminated. Check bulb.
1. Loose or broken wire #26A at diode D26A. Check continuity. Replace if defective.
2. Open or defective diode D26A. Check diode. Replace if defective.
3. Loose or broken wire #26B from diode D26A to
relay 165CR.
Check continuity. Replace if defective.
4. Loose or broken wire #165 from differential lock
switch S28 to relay 165CR. (2 places)
Check for 12 volts on wire #165 (2 places) while
activating differential lock at relay 165CR.
Check continuity. Replace if defective.
5. Defective relay 165CR. Check relay. Replace if defective.
6. Loose or broken wire #02 from platform terminal
block to differential lock switch S28.
Check continuity. Replace if defective.
7. Loose or broken wire #02A from differential lock
switch S28 to relay 165CR.
Check continuity. Replace if defective.
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