Skyjack SJKB-40-D Operating Maintenance Instructions & Part List page 58

TROUBLE
MAIN BOOM UP, RISER
BOOM UP, TELESCOPE
EXTEND, JIB BOOM UP
AND PLATFORM LEVEL-
ING UP FUNCTIONS
ONLY INOPERATIVE
(Cont.)
NO RISER BOOM DOWN
FROM PLATFORM OR
BASE
NO RISER BOOM UP
FROM PLATFORM OR
BASE
SJKB-40-D, SJKB-40-D/F
TROUBLESHOOTING (Cont.)
PROBABLE CAUSE
ELECTRICAL SYSTEM (Cont.)
11. Loose or broken wire #08 from
platform terminal block TB1 to
relay 28CR.
12. Loose or broken wire #99 from
relay 28CR to platform terminal
block TB1.
1. Loose or broken wire #13 from
base terminal block TB3 to relay
13CR.
2. Loose or broken wire #02 from
relay 13CR to base terminal block
TB3.
3. Defective relay 13CR.
4. Loose or broken wire #09 from
base terminal block TB3 to relay
13CR.
5. Loose or broken wire #13A from
relay 13CR to riser down valve coil
4H-13A.
6. Defective riser down valve coil 4H-
13A.
7. Loose or broken wire #02 from riser
down valve coil 4H-13A to base
terminal block TB3.
8. Open diode D13.
1. Loose or broken wire #14 from
base terminal block TB3 to relay
14CR.
2. Loose or broken wire #02 from
relay 14CR to base terminal block
TB3.
3. Defective relay 14CR.
4. Loose or broken wire #09 from
base terminal block TB3 to relay
14CR.
5. Loose or broken wire #14A from
relay 14CR to riser up valve coil
4H-14A.
6. Defective riser up valve.
7. Loose or broken wire #02 from riser
up valve coil 4H-14A to base
terminal block TB3.
8. Open diode D14.
11.
12.
1.
2.
3.
4.
5.
6.
7.
8.
1.
2.
3.
4.
5.
6.
7.
8.
JUN. 1999
REMEDY
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 through coil.
Replace if defective.
Check Continuity. Replace if
defective.
Check Diode. 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 through coil.
Replace if defective.
Check Continuity. Replace if
defective.
Check Diode. Replace if
defective.
SECTION 4, Page 7