This information is provided free of charge by the Department of Industrial Relations from its web site at These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at

Subchapter 6. Elevator Safety Orders
Article 9. Hydraulic Elevators

Return to index
New query

§3067. Hydraulic Driving Machines, Plungers, and Cylinders.

(a) Type of Drive.

(1) Hydraulic elevators shall be of the direct-plunger type with the plunger or cylinder attached directly to the underside of the car, or to the car frame without intervening linkages, ropes or chains.

(2) Hydraulic machines shall be of the hydroelectric type.

(b) Plungers.

(1) The plunger and connecting couplings for the plunger shall be of material with a factor of safety of not less than 5 based on the ultimate strength and with an elongation of not less than 10% in a length of 2 in. (51 mm).

(2) Plungers shall be designed, constructed, and attached to the car in accordance with Design Section 3102.

(3) Plungers shall be provided with solid metal stops and/or other means to prevent the plunger from traveling beyond the limits of the cylinder. Stops shall be so designed and constructed as to stop the plunger from maximum speed in the up direction under full pressure without damage to the connection to the driving machine, plunger, plunger connection, couplings, plunger joints, cylinder, cylinder connecting couplings or any other parts of the hydraulic system. For rated speeds exceeding 100 fpm (0.51 m/s) where a solid metal stop is provided, means other than the normal terminal stopping device shall be provided to retard the car to 100 fpm (0.51 m/s) with a retardation not greater than gravity, before striking the stop.

(4) A plunger-follower guide may be used provided it is arranged so that the elevator is always in a position where the unsupported length of the plunger conforms to the “maximum free length” as defined in Section 3102(a) and to open the power circuit if this length is exceeded.

(c) Cylinders.

(1) Cylinders shall be designed and constructed in accordance with the formula in Sections 3102(e) and 3102(f).

(2) Clearance shall be provided at the end of the cylinder so that the end of the plunger will not strike the head of the cylinder when the car is resting on its fully compressed buffer

(3) Means shall be provided to collect any oil leakage from the cylinder packing gland.

(d) System Oil Level.

(1) The hydraulic system oil level shall be monitored by a qualified person or an approved monitoring system to ensure the system oil level is within the manufacturer's recommended level.

(2) When the oil is below the recommended level, and the quantity of oil loss is not accounted for, the elevator shall be taken out of service and the Division shall be notified within 48 hours.

(A) The elevator shall remain out of service until the cause of the unaccounted oil loss is determined and corrected.

(Title 24, Part 7, Section 3067)


Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Amendment filed 11-24-76; effective thirtieth day thereafter (Register 76, No. 48).

2. Amendment filed 12-8-86; effective thirtieth day thereafter (Register 86. No. 50).

3. Amendment of section heading, new subsections (d)-(d)(2)(A), and amendment of Note filed 4-13-2000; operative 5-13-2000 (Register 2000, No. 15).

Go BackGo Back to Article 9 Table of Contents