Skyjack SJKB-40-XRT - Page 81

SECTION 4, Page 30 SJKB-40-D, SJKB-40-D/FJUN. 1999
TROUBLESHOOTING (Cont.)
TROUBLE PROBABLE CAUSE REMEDY
HYDRAULIC SYSTEM (Cont.)
NO PLATFORM ROTATE
RIGHT
1. Stuck or defective platform rotate
right valve 4H-37A.
2. Defective platform rotary actuator
RA1
3. Stuck counter balance valve CB5.
1. Clean Valve. Replace if
defective.
2. Check Actuator. Replace if
defective.
3. Clean Valve. Replace if
defective.
NO PLATFORM ROTATE
RIGHT OR LEFT
1. Plugged orifice 04.
2. Defective platform rotary actuator
RA1.
1. Clean Orifice.
2. Check Actuator. Replace if
defective.
NO TELESCOPE RE-
TRACT
1. Stuck or defective telescope retract
valve 4H-38A.
2. Stuck counter balance valve CB4.
1. Clean Valve. Replace if
defective.
2, Clean Valve. Replace if
defective.
NO TELESCOPE EX-
TEND
1. Stuck or defective telescope
extend valve 4H-39A.
2. Stuck counter balance valve CB3.
1. Clean Valve. Replace if
defective.
2, Clean Valve. Replace if
defective.
TELESCOPE CYLINDER
DRIFTS IN
1. Leaking or defective counter
balance valve CB4.
2. Telescope cylinder C3 by passing
internally.
1. Check Valve. Replace if
defective.
2. Rebuild Cylinder. Replace if
damaged.
NO RISER BOOM DOWN
1. Stuck or defective riser boom
down valve 4H-13A.
2. Stuck counter balance valve CB2.
1. Clean Valve. Replace if
defective.
2, Clean Valve. Replace if
defective.
NO RISER BOOM UP
1. Stuck or defective riser boom up
valve 4H-14A.
1. Clean Valve. Replace if
defective.
RISER BOOM DRIFTS
DOWN
1. Leaking or defective counter
balance valve CB2.
2. Riser cylinder C1 by passing
internally.
1. Check Valve. Replace if
defective.
2. Rebuild Cylinder. Replace if
damaged.
NO PLATFORM LEVEL-
ING DOWN
1. Stuck or defective platform level
down valve 4H-40A.
2. Stuck counter balance valve CB1.
3. Leveling master cylinder by
passing internally.
4. Stuck counter balance valve
CB12.
1. Clean Valve. Replace if
defective.
2. Clean Valve. Replace if
defective.
3. Rebuild cylinder. Replace if
damaged.
4. Clean Valve. Replace if
defective.