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Section 4 – Troubleshooting Information Electrical System
4.2-21 No boom extend Function from Base or Platform Consoles (ANSI)
1. Loose or broken wire #39 from base terminal
block to 121CR2 pin 30.
Check continuity. Replace if defective.
2. Loose or broken wire #02 from 121CR2 relay pin
86 to ground.
Check continuity. Replace if defective.
3. Defective relay 121CR2. Check relay. Replace if defective
4. Loose or broke wire #39A from 121CR2 relay to
harness plug pin #13.
Check continuity. Replace if defective.
5. Loose or broke wire #39A from harness plug pin
#13 to boom extend valve 4H-39A.
Check continuity. Replace if defective.
6. Loose or broken wire #02 from turret harness
plug to boom extend valve 4H-39A.
Check continuity. Replace if defective.
7. Defective boom extend coil 4H-39A. Check continuity and resistance through coil. Re-
place if defective
.
4.2-22 No boom down Function from Base or Platform Consoles (CE, AS)
1. Loose or broken wire #13 from base terminal
block to load sense/dual load zone module white
connector J4 pin 7.
Check continuity. Replace if defective.
2. No output on load sense/dual load zone module
white connector J4 pin 5 to wirer 13A.
Check pin #5 for 12 volts. If no voltage present
when operating down function check section 5 for
module information.
3. Loose or broke wire #13A from load sense/dual
load zone module white connector J4 pin 5 to
harness plug pin #3.
Check continuity. Replace if defective.
4. Loose or broke wire #13A from harness plug pin
#3 to boom down valve 4H-13A.
Check continuity. Replace if defective.
5. Loose or broken wire #02 from turret harness
plug to boom down valve 4H-13A.
Check continuity. Replace if defective.
6. Defective boom down coil 4H-13A. Check continuity and resistance through coil. Re-
place if defective.
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