• Fluids in hydraulic tools must be approved and must retain its efficacy at the highest temperature to which it will be exposed.
• Users should follow manufacturer’s recommended safe operating pressure for hoses, valves, pipes, and other fittings.
• Jacks must be used and maintained correctly for safety.

The fluid used in hydraulic power tools must be an approved fire-resistant fluid and must retain its operating characteristics at the most extreme temperatures to which it will be exposed. The exception to fire-resistant fluid involves all hydraulic fluids used for the insulated sections of derrick trucks, aerial lifts, and hydraulic tools that are used on or around energized lines. This hydraulic fluid shall be of the insulating type.

The manufacturer’s recommended safe operating pressure for hoses, valves, pipes, filters, and other fittings must not be exceeded. All jacks — including lever and ratchet jacks, screw jacks, and hydraulic jacks — must have a stop indicator, and the stop limit must not be exceeded. Also, the manufacturer’s load limit must be permanently marked in a prominent place on the jack, and the load limit must not be exceeded.

A jack should never be used to support a lifted load. Once the load has been lifted, it must immediately be blocked up. Blocks should be placed under the base of the jack when the foundation is not firm, and between the jack cap and load if the cap might slip.

To set up a jack, the user should make certain of the following:

• The base of the jack rests on a firm, level surface;
• The jack is correctly centered;
• The jack head bears against a level surface; and
• The lift force is applied evenly.

Proper maintenance of jacks is essential for safety. All jacks must be lubricated regularly. In addition, each jack must be inspected according to the following schedule:

• Jacks used continuously or intermittently at one site should be inspected at least once every six months.
• Jacks sent out of the shop for special work should be inspected when sent out and inspected when returned, and
• Jacks subjected to abnormal loads or shock should be inspected before use and immediately thereafter.