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Electrical System
4.2-19 No boom down or extend Functions from Base or Platform Consoles (ANSI)
1. Defective diode D09-1 in base control console.
2. Loose or broken wire #9B from base terminal
block to LS4 (boom angle) and/or LS5 (boom
extension) dual load zone limit switches.
3. Open or defective limit switch LS4. Switch is
NCHO (normally open held open). Closed above
57°
4. Open or defective limit switch LS5. Switch is NC
(normally closed). Open beyond
5. Loose or broken wire #121 from LS4 (boom
angle) and/or LS5 (boom extension) dual load
zone limit switches to base terminal block.
6. Loose or broken wire #121 from base terminal
block to boom down and boom extend cut out
relays CR121 and 121CR2.
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.
2. Loose or broken wire #02 from 121CR relay pin
86 to ground.
3. Defective relay 121CR.
4. Loose or broke wire #13A from 121CR relay to
harness plug pin #3.
5. Loose or broke wire #13A from harness plug pin
#3 to boom down valve 4H-13A.
6. Loose or broken wire #02 from turret harness
plug to boom down valve 4H-13A.
7. Defective boom down coil 4H-13A.
SJ82 T, SJ86 T
Section 4 – Troubleshooting Information
Check diode. Replace if defective.
Check continuity. Replace if defective.
Adjust limit switch if required. Check continuity
through switch. Replace if defective.
Adjust limit switch if required. Check continuity
through switch. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check relay. Replace if defective
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity and resistance through coil. Re-
.
place if defective
229040ABA
145
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