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Electrical System Section 4 – Troubleshooting Information
4.2-19 No boom down or extend Functions from Base or Platform Consoles (ANSI)
1. Defective diode D09-1 in base control console. Check diode. Replace if defective.
2. Loose or broken wire #9B from base terminal
block to LS4 (boom angle) and/or LS5 (boom
extension) dual load zone limit switches.
Check continuity. Replace if defective.
3. Open or defective limit switch LS4. Switch is
NCHO (normally open held open). Closed above
57°
Adjust limit switch if required. Check continuity
through switch. Replace if defective.
4. Open or defective limit switch LS5. Switch is NC
(normally closed). Open beyond
Adjust limit switch if required. Check continuity
through switch. Replace if defective.
5. Loose or broken wire #121 from LS4 (boom
angle) and/or LS5 (boom extension) dual load
zone limit switches to base terminal block.
Check continuity. Replace if defective.
6. Loose or broken wire #121 from base terminal
block to boom down and boom extend cut out
relays CR121 and 121CR2.
Check continuity. Replace if defective.
4.2-20 No boom down Function from Base or Platform Consoles (ANSI)
1. Loose or broken wire #13 from base terminal
block to 121CR pin 30.
Check continuity. Replace if defective.
2. Loose or broken wire #02 from 121CR relay pin
86 to ground.
Check continuity. Replace if defective.
3. Defective relay 121CR. Check relay. Replace if defective
4. Loose or broke wire #13A from 121CR relay to
harness plug pin #3.
Check continuity. Replace if defective.
5. Loose or broke wire #13A from harness plug pin
#3 to boom down valve 4H-13A.
Check continuity. Replace if defective.
6. Loose or broken wire #02 from turret harness
plug to boom down valve 4H-13A.
Check continuity. Replace if defective.
7. Defective boom down coil 4H-13A. Check continuity and resistance through coil. Re-
place if defective
.
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