Skyjack SJKB-40-D Operating Maintenance Instructions & Part List page 79

TROUBLE
NOTE: ALL TESTS SHOULD BE PERFORMED WITH BOOM OVER NON-STEERING AXLE
ALL FUNCTIONS INOP-
ERATIVE
ALL BOOM FUNCTIONS
INOPERATIVE
NO TURRET LEFT
NO TURRET RIGHT
TURRET ROTATION
BRAKE WILL NOT RE-
LEASE
NO STEER RIGHT
SECTION 4, Page 28
TROUBLESHOOTING
PROBABLE CAUSE
HYDRAULIC SYSTEM
1. Broken or defective Pump
Coupling.
1. Defective system relief valve.
2. Stuck or defective dump valve 2H-
21A..
3. Stuck or defective proportional
valve 2H-12..
4. Defective system pump P2.
1. Stuck or defective turret rotate
left valve 4H-32A.
2. Stuck or defective relief valve
RV2.
3. Stuck or defective relief valve
RV3.
4. Defective turret rotation motor
M2.
5. Stuck or defective counter
balance valve CB10.
6. Turret rotation speed control
valve FC1 out of adjustment.
1. Stuck or defective turret rotate
right valve 4H-33A.
2. Stuck or defective relief valve
RV2.
3. Stuck or defective relief valve
RV3.
4. Defective turret rotation motor
M2.
5. Stuck or defective counter
balance valve CB11.
6. Turret rotation speed control valve
FC1 out of adjustment.
1. Stuck or defective shuttle valve
SV-3.
2. Stuck or defective brake pack BP-
1.
1. Stuck or defective steer right
valve 4H-23A.
2. Blown seals in rotary manifold.
3. Steer cylinder
internally.
JUN. 1999
1.
1.
2.
3.
4.
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
6.
1.
2.
1.
2.
bypassing 3.
REMEDY
Check Coupling. Replace if
defective.
Check Shuttle Valve. Replace if
defective.
Check Shuttle Valve. Replace if
defective.
Check Shuttle Valve. Replace if
defective.
Check Pump. Replace if
defective.
Clean Valve. Replace if defective.
Clean Valve. Replace if defective.
Clean Valve. Replace if defective.
Check Motor. Replace if
defective.
Clean Valve. Replace if defective.
Refer to section 2, page 5.
Clean Valve. Replace if defective.
Clean Valve. Replace if defective.
Clean Valve. Replace if defective.
Check Motor. Replace if
defective.
Clean Valve. Replace if defective.
Refer to section 2, page 5.
Clean Valve. Replace if defective.
Rebuild Cylinder. Replace if
defective.
Clean Valve. Replace if defective.
Rebuild Rotary Manifold. Replace
if defective.
Rebuild Cylinder. Replace if
damaged.
SJKB-40-D, SJKB-40-D/F