SECTION 4, Page 5SJKB-40-D, SJKB-40-D/F JUN. 1999
TROUBLESHOOTING (Cont.)
TROUBLE PROBABLE CAUSE REMEDY
ELECTRICAL SYSTEM (Cont.)
NO BOOM OR STEER
FUNCTIONS FROM PLAT-
FORM OR BASE
1. Loose or broken wire #09 from
base terminal block TB3 to relay
20CR.
2. Defective relay 20CR.
3. Loose or broken wire #02 from
relay 20CR to base terminal block
TB3.
4. Loose or broken wire #20 from
base terminal block TB3 to relay
20CR.
5. Loose or broken wire #20A from
relay 20CR to base terminal block
TB3.
6. Loose or broken jumper wire 20A
on base terminal block TB3.
7. Open diode D20A.
8. Loose or broken wire #21 from
base terminal block TB3 to dump
valve relay 21CR1.
9. Defective dump valve relay
21CR1.
10. Loose or broken wire #02 from
dump valve relay 21CR1 to dump
valve coil 2H-21A.
11. Defective dump valve coil 2H-21A.
12. Loose or broken wire #02 from
dump valve coil 2H-21A to base
terminal block TB3.
13. Loose or broken wire #09 from
base terminal block TB3 to dump
valve relay 21CR1.
14. Loose or broken wire #12 from
base terminal block TB3 to
proportional valve coil 2H-12.
15. Defective proportional valve coil
2H-12.
16. Loose or broken wire #02 from
proportional valve coil 2H-12 to
base terminal block TB3.
1. Check Continuity. Replace if
defective.
2. Check Relay. Replace if
defective.
3. Check Continuity. Replace if
defective.
4. Check Continuity. Replace if
defective.
5. Check Continuity. Replace if
defective.
6. Check Continuity. Replace if
defective.
7. Check Diode. Replace if
defective.
8. Check Continuity. Replace if
defective.
9. Check Relay. Replace if
defective.
10. Check Continuity. Replace if
defective.
11. Check Continuity through coil.
Replace if defective.
12. Check Continuity. Replace if
defective.
13. Check Continuity. Replace if
defective.
14. Check Continuity. Replace if
defective.
15. Check Continuity. Replace if
defective.
16. Check Continuity. Replace if
defective.
NO BOOM FUNCTIONS
FROM PLATFORM
1. Loose or broken wire #09 from
platform terminal block to boom
function control board BFC1.
2. Loose or broken wire #02 from
platform terminal block TB1 to
boom function control board BFC1.
1. Check Continuity. Replace if
defective.
2. Check Continuity. Replace if
defective.
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