Skyjack SJKB-40-XRT - Page 57

SECTION 4, Page 6 SJKB-40-D, SJKB-40-D/FJUN. 1999
TROUBLESHOOTING (Cont.)
TROUBLE PROBABLE CAUSE REMEDY
ELECTRICAL SYSTEM (Cont.)
NO BOOM FUNCTIONS
FROM PLATFORM (Cont.)
3. Defective boom function control
board BFC1.
4. Loose or broken wire #12 from
boom function control board BFC1
to platform terminal block TB2.
5. Loose or broken wire #12 from
platform terminal block TB2 to
base terminal block TB3.
6. Loose or broken wire #12 from base
terminal block TB3 to proportional
valve coil 2H-12.
7. Defective proportional valve coil
2H-12.
8. Loose or broken wire #02 from
proportional valve coil 2H-12 to
base terminal block TB3.
3. Refer to section 5 "boom function
control board diagnostics".
4. Check Continuity. Replace if
defective.
5. Check Continuity. Replace if
defective.
6. Check Continuity. Replace if
defective.
7. Check Continuity through coil.
Replace if defective.
8. Check Continuity. Replace if
defective.
MAIN BOOM DOWN,
RISER BOOM DOWN,
TELESCOPE RETRACT,
JIB BOOM DOWN AND
PLATFORM LEVELING
DOWN FUNCTIONS ONLY
INOPERATIVE.
1. Open diode D58. 1. Check diode. Replace if defective.
MAIN BOOM UP, RISER
BOOM UP, TELESCOPE
EXTEND, JIB BOOM UP
AND PLATFORM LEVEL-
ING UP FUNCTIONS
ONLY INOPERATIVE
1. Machine not level.
2. Loose or broken wire #09 from base
terminal block TB3 to tilt switch
fuse F1.
3. Blown tilt switch fuse F1.
4. Loose or broken wire #02 from base
terminal block TB3 to tilt switch
TS1.
5. Defective tilt switch TS1.
6. Loose or broken wire #28 from tilt
switch TS1 to base terminal block
TB3.
7. Loose or broken wire #28 from base
terminal block TB3 to platform
terminal block TB2.
8. Loose or broken wire #28 from
platform terminal block TB2 to
relay 28CR.
9. Loose or broken wire #02 from relay
28CR to platform terminal block
TB1.
10. Defective relay 28CR.
1. Move machine to a firm level
surface.
2. Check Continuity. Replace if
defective.
3. Replace fuse. Check for shorted
wiring.
4. Check Continuity. Replace if
defective.
5. Check Switch. Replace if
defective.
6. Check Continuity. Replace if
defective.
7. Check Continuity. Replace if
defective.
8. Check Continuity. Replace if
defective.
9. Check Continuity. Replace if
defective.
10. Check Relay. Replace if defective.