Digger Derrick Testing & Inspection Service

Call: (888) 595-8323

Ohio CAT provides third party testing and inspection service on digger derrick trucks according to ANSI guidelines utilizing state-of-the-art test equipment and certified inspectors. After digger derrick inspection tests are completed, we will provide an electronic report. Upon completion of any necessary repairs, we will then issue certification.

• ANSI A10.31

• Operational / Functional Test Inspection

• Visual Inspection

• Magnetic Particle Inspection

• Dye Penetrant Inspection

• Ultrasonic Inspection Tests of Accessible Pins

• Dielectric Inspection of Bucket Liners

• Dielectric Inspection of Fiberglass Boom

• Dielectric Inspection of Live Line Tools

For more information or to schedule your digger derrick testing and inspection service, call (888) 595-8323

Digger Derrick Test Inspections Include:


A. Visual Inspection: A complete inspection of accessible areas including:

  1. Outriggers; Pads, structure, welds, bolts, hoses, cylinders, valves, pins and retainers.
  2. Chassis; Truck frame, aerial sub-frame, suspension, PTO, pintle hook, and components of the brake, steering, electrical, air, hydraulic, exhaust, and cooling systems.
  3. Pedestal; Mounting bolts and welds, pedestal structure, diagonal brace, attachment welds or pins, hydraulic swivel joint, hydraulic components, swing drive gearbox mounting bolts, backlash between swing pinion or bullgear, electric collector ring and brushes and lower control operation.
  4. Rotation Bearing; Upper and lower bearing attachment weld and bolts, vertical movement of bearing, and proper torque on accessible bearing bolts.
  5. Turntable; Turntable structure, bucket leveling cables, leveling cylinders, compensating chains or sprockets, and hydraulic system components.
  6. Lower Boom; Boom structure, welds, lift cylinders and attachment, hydraulic system, leveling cables or rods, upper or extend cylinder and attachment, pushlinks, boom rest supports, tie-down straps, lower insulator and mounting, extension roller assembly and wear pads.
  7. Elbow; Elbow structure, hydraulic hoses and leveling cables.
  8. Upper Boom (Extension); Structure, welds, leveling cables or rods, wear pads, upper insulator and mounting, hydraulic lines and components, jib structure and mounting, tool circuit hoses and fittings, pole claw arms and mounting brackets.
  9. Platform (Bucket); Mounting bracket bolts, leveling system, exterior condition, control operation and hydraulic lines and components.
  10. Digger and Auger; Digger mounting arm and housing, gearbox, auger, digger wind-up bracket or rope, auger stop bracket, lock mechanism and control operation.
  11. Winch; Mounting brackets, bolts, pins; gearbox, hydraulic components, load line, and controls.
  12. General; Load rating chart, electrical hazard placards, MADDDC placards and upper or lower control operation placards.

The visual inspection includes removal of inspection cover plates as necessary to do a thorough job.

B. Load Tests: Load tests and stability tests are performed as required to meet OSHA/ANSI requirements or per your specifications.

C. Magnetic Particle Inspection: Magnetic particle is a nondestructive test method used to identify surface cracks on ferrous material. It is performed on all critical welds, plates and castings of items listed in Part A during the visual inspection.

D. Dye Penetrant Inspection: Dye Penetrant is a nondestructive test method used to identify surface cracks and works on any structural surface including all critical welds, plates, castings made of non-ferrous material and any area requiring verification in Part C or Part E.

E. Ultrasonic Inspection: Ultrasonic is a nondestructive test method used to detect flaws in accessible critical pins. Use of ultrasonic reduces the number of pins that have to be removed for inspection. Pins with flat end surfaces and do not have drilled holes are best suited for ultrasonic.

F. Torque Testing: Torque testing all critical fasteners in accessible areas including upper and lower rotation bearing, swing gearbox, boom connections, and platform mounting.



A functional and operational test is performed to check the operation of controls, bearings, pins, bushings, cylinders, holding   valves, bucket leveling mechanisms, outriggers, etc. This test will also find worn swing bearings or gearboxes, worn pins or bushings, and loose fasteners critical to the operation of the aerial.



A dielectric test up to 100kV as specified by ANSI standards. The dielectric test verifies the electrical insulating strength in the   FRP upper and lower booms, bucket, liners, FRP extensions on digger derricks, tool circuits, and upper control system.



Dielectric Tests: Bucket liners; hydraulic oil to ASTM D1816 standards; Hotsticks.

Oil Spectroanalysis: Chemical analysis of oil in engines, transmissions, and hydraulic systems. Determines type and amount of contamination.

DOT Inspection: A thorough inspection of the chassis as specified by Federal or State DOT. Includes a DOT sticker and one page report.

Stability Tests: Performed to meet the requirements of OSHA/ANSI specifications.

Thickness Testing: Ultrasonic thickness testing is a nondestructive test method used to determine thickness of materials where thickness is critical and difficult to measure with mechanical test equipment.



A comprehensive record shall be completed for all inspections and tests and signed

Contact your nearest Power Systems location for more information: Power Systems Locations