Skyjack SJKB-40-D Operating Maintenance Instructions & Part List page 59

TROUBLE
NO RISER BOOM UP
FROM PLATFORM
NO RISER BOOM DOWN
FROM PLATFORM
NO MAIN BOOM DOWN
FROM PLATFORM OR
BASE CONTROLS
NO MAIN BOOM UP
FROM PLATFORM OR
BASE CONTROLS
SECTION 4, Page 8
TROUBLESHOOTING (Cont.)
PROBABLE CAUSE
ELECTRICAL SYSTEM (Cont.)
1. Loose or broken wire #99 from
platform terminal block TB1 to riser
up/down switch S15.
2. Defective riser up/down switch
S15.
3. Loose or broken wire #14 from riser
up/down switch S15 to platform
terminal block TB2.
4. Loose or broken wire #14 from
platform terminal block to base
terminal block TB3.
1. Loose or broken wire #08 from
platform terminal block TB1 to riser
up/down switch S15.
2. Defective riser up/down switch
S15.
3. Loose or broken wire #13 from riser
up/down switch S15 to platform
terminal block TB2.
4. Loose or broken wire #13 from
platform terminal; block TB2 to base
terminal block TB3.
1. Loose or broken wire #30 from base
terminal block TB3 to relay 30CR.
2. Loose or broken wire #02 from relay
30CR to base terminal block TB3.
3. Defective relay 30CR.
4. Loose or broken wire #09 from base
terminal block TB3 to relay 30CR.
5. Loose or broken wire #30A from
relay 30CR to main boom down
valve coil 4H-30A.
6. Defective main boom down coil 4H-
30A.
7. Loose or broken wire #02 from main
boom down valve coil 4H-30A to
base terminal block TB3.
8. Open diode D30-1.
1. Loose or broken wire #31 from base
terminal block TB3 to relay 31CR.
2. Loose or broken wire #02 from relay
31CR to base terminal block TB3.
3. Defective relay 31CR.
4. Loose or broken wire #09 from base
terminal block TB3 to relay 31CR.
5. Loose or broken wire #31A from
relay 31CR to main boom up valve
coil 4H-31A.
JUN. 1999
REMEDY
1. Check Continuity. Replace if
defective.
2. Check Switch.
defective.
3. Check Continuity. Replace if
defective.
4. Check Continuity. Replace if
defective.
1. Check Continuity. Replace if
defective.
2. Check Switch.
defective.
3. Check Continuity. Replace if
defective.
4. Check Continuity. Replace if
defective.
1. Check Continuity. Replace if
defective.
2. Check Continuity. Replace if
defective.
3. Check Relay. Replace if defective.
4. Check Continuity. Replace if
defective.
5. Check Continuity. Replace if
defective.
6. Check Continuity through coil.
Replace if defective.
7. Check Continuity. Replace if
defective.
8. Check Diode. Replace if defective.
1. Check Continuity. Replace if
defective.
2. Check Continuity. Replace if
defective.
3. Check Relay. Replace if defective.
4. Check Continuity. Replace if
defective.
5. Check Continuity. Replace if
defective.
SJKB-40-D, SJKB-40-D/F
Replace if
Replace if