ASME PALD 1-1988 — Automotive Lifting Devices

28 10 月, 2026
ASME Standards

🚗 ASME/ANSI PALD-1-1988 is Volume 1 of the Safety Standard for Portable Automotive Lifting Devices, dedicated to hydraulic hand jacks. The Standard has its origins in the early 1980s: in June 1979 the Jack Institute petitioned the B30 Committee to develop a standard for automotive jacks or include them in B30.1; when the B30 Committee declined, the Jack Institute petitioned ANSI in July 1979 to form a committee, ASME was approved as sponsor in September 1979, the Committee on Portable Automotive Lifting Devices (PALD) held its inaugural meeting in July 1980, the first edition was approved and published in 1983, and this edition was approved by ANSI as an American National Standard on October 6, 1988. The PALD series is published in separate volumes, one per equipment type, each complete and self-contained for design, marking, identification, testing, operation, inspection, and maintenance. The volume system includes Hydraulic Hand Jacks (PALD-1), Transmission Jacks (PALD-2), Engine Stands (PALD-3), Vehicle Support Stands (PALD-4), Mechanical Screw Jacks (PALD-5), Mechanical Bumper Jacks (PALD-6), Mechanical Scissors Jacks (PALD-7), Mechanical Frame Jacks (PALD-8), Upright Type Mobile Lifts (PALD-9), Service Jacks (PALD-10), Wheel Dollies (PALD-11), Shop Cranes (PALD-12), Swing Type Mobile Lifts (PALD-13), Scissors Type Mobile Lifts (PALD-14), Auxiliary Support Stands (PALD-15), and Ramps (PALD-16).

💡 The PALD series places the safety responsibility squarely on the user: many automotive lifting accidents cannot be prevented by mechanical means alone — they can only be prevented by the exercise of intelligence, care, and common sense, as the Standard’s Introduction states plainly.

1. Scope, Purpose, and Classification 📌

PALD-1 applies to hydraulic hand jacks — portable automotive lifting devices driven by a hand-operated pump and hydraulic cylinder (a typical hydraulic hand jack is illustrated in Figure 1 of the Standard). The purpose of the Standard includes serving as a guide to governmental authorities having jurisdiction, and as a behavioral guide for manufacturers, suppliers, purchasers, and operators of the equipment. The Standard classifies products by the class of use hazard (e.g., vehicle lifting versus supporting), and sets corresponding design requirements for each class. This section also establishes the framework of definitions (Section 2), design (Section 3), product marking and identification (Section 4), design qualification testing (Section 5), product instructions and warnings (Section 6), and operation, maintenance, and inspection (Section 7).

⚠️ PALD covers “portable” lifting devices: hydraulic hand jacks, transmission jacks, engine stands, support stands, and the like. Fixed scissors lifts and four-post lifts are governed by other standards and regulations — selecting equipment by the wrong standard invalidates the whole safety configuration.

2. Design and Safety Requirements 🔧

Section 3, Design, specifies the structural integrity of hydraulic hand jacks under normal and abnormal use:

Rated capacity: the product shall have a clear rated lifting capacity, and the design must ensure no failure under the rated load and foreseeable dynamic loads;
Structural strength: load-carrying parts such as the base, column, cylinder, piston, and handle are designed to the Standard’s design factors, with materials and workmanship ensuring adequate strength and reliability;
Hydraulic system: the cylinder, seals, fluid passages, and relief valve shall withstand the working pressure and hold pressure reliably; the piston shall not settle of its own accord under full load;
Stability: the contact area of the top surface and the base size shall prevent the device from tipping under load at the lifting point;
Fatigue and misoperation resistance: handle operating force and relief-valve action shall be predictable, preventing accidental release of the load.

🚨 The most dangerous failure of a hydraulic hand jack is “sudden load drop from loss of pressure”: aging seals, a corroded piston, or a leaking fluid path make an already raised load settle slowly or drop suddenly. That is why the PALD system always stresses — immediately after lifting, support the vehicle with rigid devices such as vehicle support stands (PALD-4), and never work under a vehicle supported only by a hydraulic hand jack.

3. Product Marking and Identification 🏷️

Section 4 requires permanent marking on the product, including: the manufacturer’s name or trademark, model designation, rated capacity (rated load), and necessary operating-procedure warnings. Marks shall be clear, durable, and legible in use; marks that become illegible from wear or paint coverage shall be restored or replaced per the manufacturer’s requirements. The rated-capacity mark is the direct basis for the user to select and verify the equipment — missing or altered marks mean nonconformance with the Standard.

4. Design Qualification Testing 🧪

Section 5 specifies the design qualification test before a product is placed on the market: for each design, the manufacturer shall perform a proof test by loading the device to a specified proof load (above the rated load) and holding it for a specified time, confirming no permanent deformation, no rupture, and no safety-affecting damage; the hydraulic system shall hold pressure reliably under the proof load. A design that passes the test may go into production. Test methods, load values, and acceptance criteria follow the Standard’s provisions, and test records shall be kept for review.

⚠️ The design qualification test is a “design-type” verification and is not the same as routine inspection of each production unit. Manufacturers should also pair it with production quality control (material inspection, hydraulic testing, sample testing) to ensure production units match the qualified design.

5. Product Instructions and Warnings 📖

Section 6 requires each product to be accompanied by clear, complete operating instructions covering: correct use procedures; rated capacity and limitations (e.g., use only on firm, level ground); safety warnings in use (no overload, no work under an unsupported load, no use of a hand jack for unintended purposes); inspection and maintenance requirements; and troubleshooting guidance. Warning signs shall appear both on the product body and in the instructions, in plain language. The manufacturer’s instructions are the basic textbook for user training, and the Standard recommends that users build operating procedures from them.

6. Operation, Maintenance, and Inspection 🛠️

Section 7 is the user’s operating code. Key points:

Pre-use inspection: check the handle, oil level, piston, and base, and look for hydraulic leaks;
Correct placement: confirm the lifting point is at the vehicle manufacturer’s designated jacking points and the base is on firm, level ground;
Lifting process: lift slowly and steadily, watch the load center and eccentric loading; on reaching height, place support stands immediately and lower the jack clear of the load;
Prohibitions: no overload, no working under a vehicle supported only by a hydraulic lifting device, and no use of the Standard’s equipment for unintended purposes (e.g., jacking piping or heavy equipment);
Maintenance: replenish hydraulic oil, clean the piston, and inspect seals per schedule; remove from service immediately on rust, deformation, cracking, or leakage;
Inspection and disposal: periodic thorough inspection by qualified personnel; repair or discard defective units, and render discarded units unusable.

Work Phase	Key Safety Action	Common Accident Cause
Pre-use	Check device condition and accessories (handle, oil, seals)	Operating defective units (leaks, corroded pistons)
Placement	Confirm jacking point, firm level ground, vertical alignment	Wrong jacking point, soft ground, eccentric loading
Lifting	Lift slowly and steadily, control height, watch load state	Jerky lifting, center-of-gravity shift
Supporting	Place and lock support stands immediately after lifting	Relying on the hand jack alone, working unsupported
Maintenance/inspection	Periodic overhaul, marking checks, disposal	Neglected inspection, use with worn markings

7. Engineering Practice Essentials 🛠️

🔍 Equipment selection: choose a hand jack and matching support stands with adequate rated capacity for the vehicle/load weight, lift height, and use frequency.
🔧 Support first: make “support immediately after lifting” a mandatory work step written into the shop procedure.
📋 Marking management: quarterly verify product markings and rated capacity; restore them when worn.
🎓 Training: train operators on the manufacturer’s instructions and qualify them before independent work.
📊 Closed-loop records: maintain an equipment register covering purchase, inspection, repair, and disposal.

8. Frequently Asked Questions ❓

❓ Q: Why is a support stand still required after jacking?
A: The design life and seal performance of a hydraulic hand jack do not guarantee indefinite pressure holding, and vehicle load vibration can also cause failure. Support stands (PALD-4) transfer the load to a rigid load path and are the prerequisite for anyone working under the vehicle.

❓ Q: How does the PALD series relate to B30.1?
A: B30.1 covers general industrial lifting equipment — jacks, rollers, and related devices. The PALD series separately targets portable lifting products for the automotive repair industry (including support stands and shop cranes). They are parallel safety standard systems maintained by different committees.

❓ Q: What is the difference between the proof test and daily inspection of a hand jack?
A: The proof test is a “design-type” verification at the manufacturing stage with a proof load above the rated load; the daily inspection is a condition check before and during use. After repair or replacement of critical components, the equipment should be re-evaluated and, where necessary, re-tested.

🔍 Q: Can equipment with worn markings still be used?
A: No. Markings such as rated capacity are safety information; once illegible or missing, it is impossible to confirm whether the equipment is suitable for the current load. The user should stop using it and restore the markings per the manufacturer’s requirements.