Skyjack SJKB-40-D Operating Maintenance Instructions & Part List page 60

TROUBLE
NO MAIN BOOM UP
FROM PLATFORM OR
BASE CONTROLS (Cont.)
NO MAIN BOOM UP
FROM PLATFORM CON-
TROLS
NO MAIN BOOM DOWN
FROM PLATFORM CON-
TROLS
NO TURRET ROTATE
LEFT FROM PLATFORM
OR BASE CONTROLS
SJKB-40-D, SJKB-40-D/F
TROUBLESHOOTING (Cont.)
PROBABLE CAUSE
ELECTRICAL SYSTEM (Cont.)
6. Defective main boom up valve coil
4H-31A.
7. Loose or broken wire #02 from
main boom up valve coil 4H-31A
to base terminal block TB3.
8. Open diode D31-1.
1. Loose or broken wire #99 from
platform terminal block TB1 to
main boom up/down switch S14.
2. Defective main boom up/down
switch S14.
3. Loose or broken wire #31 from
main boom up/down switch S14
to platform terminal block TB2.
4. Loose or broken wire #31 from
platform terminal block TB2 to
base terminal block TB3.
1. Loose or broken wire #08 from
platform terminal block TB1 to
main boom up/down switch S14.
2. Defective main boom up/down
switch S14.
3. Loose or broken wire #30 from
main boom up/down switch to
platform terminal block TB1.
4. Loose or broken wire #30 from
platform terminal block TB2 to
base terminal block TB3.
1. Loose or broken wire #32 from
base terminal block TB3 to relay
32CR.
2. Loose or broken wire #02 from
relay 32CR to base terminal block
TB3.
3. Defective relay 32CR.
4. Loose or broken wire #09 from
base terminal strip TB3 to relay
32CR.
5. Loose or broken wire #32A from
relay 32CR to turret rotate left
valve coil 4H-32A.
6. Defective turret rotate left valve
coil 4H-32A.
7. Loose or broken wire #02 from
turret rotate left valve coil 4H-32A
to base terminal block TB3.
8. Open diode D32.
6.
7.
8.
1.
2.
3.
4.
1.
2.
3.
4.
1.
2.
3.
4.
5.
6.
7.
8.
JUN. 1999
REMEDY
Check Continuity through coil.
Replace if defective.
Check Continuity. Replace if
defective.
Check Diode. Replace if
defective.
Check Continuity. Replace if
defective.
Check Switch. Replace if
defective.
Check Continuity. Replace if
defective.
Check Continuity. Replace if
defective.
Check Continuity. Replace if
defective.
Check 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 through coil.
Replace if defective.
Check Continuity. Replace if
defective.
Check Diode. Replace if
defective.
SECTION 4, Page 9