SKYJACK, Page 15SJIII Conventional Series
143911
Section 4 - Troubleshooting Information Service and Maintenance
Hydraulic System (Continued)
4.2-10 Aerial Platform will not hold on a Grade (Machines with Integrals Brakes)
1. Worn or damaged brake discs.
Inspect brake discs for wear. Replace if worn or damaged. -
2. Broken or damaged brake compression springs.
Check springs. Replace if defective. -
4.2-11 Platform does not Steer
1. Right steer valve 4H-23 or left steer valve 4H-24 defective or sticking.
Clean valve. Replace if defective. -
2. Steer cylinder C3 seals leaking.
Rebuild cylinder(s). Replace if damaged. -
3. Mechanical binding in king pins.
Check for binding. Repair as needed. -
4. Orifices 03 plugged.
Clean orifices, and reinstall. -
4.2-12 All System sluggish
1. System Relief Valve defective or not adjusted properly.
Adjust valve. Replace if defective. -
2. Hydraulic pump P1 worn.
Check pump. Replace if defective. -
3. Proportional valve 2H-59 contaminated or defective.
Clean. Replace if defective. -
4.2-13 Power Extension Platform will not Extend or Retract
1. Platform extend valve 4H-26 or platform retract valve 4H-27 defective or is sticking.
Clean valve. Replace if defective. -
2. Powered platform cylinder C5 seals defective.
Rebuild cylinder. Replace if damaged. -
3. Mechanical binding in power extension platform mechanism.
Check for binding. Repair as needed. -
4.2-14 High/Low Torque Inoperative
1. Stuck speed valve 3H-18A-1.
Clean valve. Replace if defective. -
2. Stuck speed valve 3H-18A-2.
Clean valve. Replace if defective. -
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