Skyjack SJIII 3220 Operating & Maintenance Manual page 75

TROUBLESHOOTING INFORMATION
TROUBLE
BRAKE(S) WILL NOT
RELEASE
PLATFORM DOES NOT
STEER
ALL SYSTEMS
SLUGGISH
POWER EXTENSION
PLATFORM WILL NOT
EXTEND OR RETRACT
HIGH/LOW TORQUE
INOPERATIVE
SJIII Series - The CONVENTIONALS
PROBABLE CAUSE
HYDRAULIC SYSTEM
1. Brake Valve (3H-17A) defective or is
sticking.
2. Brake Orifice(s) (05) plugged.
3. Brake Cylinder(s) (C4) defective.
1. Right Steer Valve (4H-23A) or Left
Steer Valve (4H-24A) defective or
sticking.
2. Steer Cylinder (C3) seals leaking.
3. Mechanical binding in King Pins.
4. Orifices (03) plugged.
1. System Relief Valve defective or not
adjusted properly.
2. Hydraulic pump (P1) worn.
3. Compensator Valve (CMP1) defective.
4. Proportional Valve
contaminated or defective.
1. Platform Extend Valve (4H-26) or
Platform Retract Valve (4H-27)
defective or is sticking.
2. Powered Platform Cylinder (C5) seals
defective.
3. Mechanical binding in powered
platform mechanism.
1. Stuck Speed Valve (3H-18A-1).
2. Stuck Speed Valve (3h-18A-2).
117128
Complete Revision 99-05-01
1. Clean valve. Replace if defective.
2. Remove orifice(s). Clean and
reinstall.
3. Rebuild cylinder(s). Replace if
damaged.
1. Clean valve. Replace if defective.
2. Rebuild cylinder(s). Replace if
damaged.
3. Check for binding. Repair as
needed.
4. Clean Orifices, and reinstall.
1. Adjust valve. Replace if defective.
2. Check pump. Replace if defective.
3. Clean. Replace if defective.
(2H-59B) 4. Clean, replace if defective.
1. Clean valve. Replace if defective.
2. Rebuild
damaged.
3. Check for binding. Repair as
needed.
1. Clean valve. Replace if defective.
2. Clean valve. Replace if defective.
REMEDY
cylinder. Replace if
SECTION 4, Page 11