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ASME PALD 11a-1987 — Wheel Dollies Addenda (a)
📐 ASME PALD 11a-1987 is Addenda (a) to ASME/ANSI PALD 11-1986, the Wheel Dollies volume of the Safety Standards for Portable Automotive Lifting Devices. Approved by ANSI on September 7, 1987, and issued November 30, 1987, it revises the 1986 edition by replacement pages flagged with margin note (a). The addenda clarifies the introduction, scope, terminology (lifting frame, rollers), marking clauses, and qualification testing clauses — an essential document for keeping the wheel dolly standard technically current.
💡 Addenda (a) is the first addenda to PALD 11-1986. Retain the addenda title page, copyright pages, and all replaced pages so the text evolution can be traced.
1. Main Revisions in Addenda (a) 📌
PALD 11a-1987 revises the first, second, and third paragraphs of General (Introduction) and adds a footnote; Section 1 is revised; Section 2 revises the lifting frame definition (also relocated alphabetically) and the rollers definition; Figure 1 callouts are revised; clause 4.4 is revised; 5.1.2 is revised; and the first paragraph of the warning example in Section 6 is revised.
| Page | Location | Change |
|---|---|---|
| 1 | General | First three paragraphs revised; footnote added |
| 2 | Section 1 | Revised |
| 2 | Section 2 | Lifting frame definition revised and relocated; rollers definition revised |
| 5 | Figure 1 | Lifting frame callouts revised |
| 6 | 4.4 | Revised |
| 7 | 5.1.2 | Revised |
| 8–9 | Section 6 | Warning example first paragraph revised |
⚠️ Terminology changes matter: the lifting frame definition was revised and relocated alphabetically, and the rollers definition was revised. Old documents citing these terms should be checked against the latest text.
2. Why the Definition Revisions Matter 🔧
This addenda revises the two core terms: lifting frame (the structure that contacts and supports the wheel) and rollers (components that support the wheel and let it turn on the dolly). The lifting frame definition was also reordered alphabetically within Section 2, making the terminology system more consistent. These revisions make the standard text more rigorous and give designers, inspectors, and trainers a clearer basis for their work.
🚨 The lifting frame and rollers are the load-carrying core of a wheel dolly. With clearer definitions, inspectors should verify: no cracks or deformation in the frame, free-turning rollers that reliably support the wheel — otherwise the unit is removed from service.
3. Wheel Dolly Technical Requirements and Test Clauses 📏
Wheel dollies support and move wheels, tires, brake assemblies, and similar components. The revised clauses 4.4 and 5.1.2 clarify product marking and design qualification testing, further defining the rated capacity marking and the verification content. Typical requirements: no functional damage at rated capacity, stability on hard level ground, functioning rollers, and reliable adjustable-mechanism locking.
| Item | Typical Requirement | Addenda (a) Change |
|---|---|---|
| Lifting frame | No cracks, no permanent deformation | Definition revised — clearer basis |
| Rollers | Free rotation, reliable support | Definition revised |
| Capacity marking | Permanent marks: maker, rated capacity | Clause 4.4 revised |
| Qualification testing | Proof load test without damage | 5.1.2 revised |
| Warning examples | Clear, complete warning text | Section 6 example revised |
4. Engineering Practice Essentials 🛠️
- 🔍 Definition alignment: put the revised lifting frame and rollers definitions into inspection checklists and training materials so the whole team shares one understanding.
- 🔧 Marking check: verify the rated capacity marking on units against purchase documents and technical files.
- 📋 Version management: keep “PALD 11-1986 + 11a-1987” as one set; incorporate later addenda (b), (c) as published.
- 📊 Site compliance: wheel dollies only support and move wheel components — never substitute for support stands or carry whole-vehicle loads.
💡 The core value of this addenda: more rigorous terminology and clearer clauses unify the standards applied in manufacturing, inspection, and training, reducing ambiguity and disputes.
5. Frequently Asked Questions ❓
❓ Q: Which definitions did PALD 11a-1987 revise?
A: It revised the lifting frame definition (also relocated alphabetically) and the rollers definition, making terminology more consistent and functional requirements clearer.
A: It revised the lifting frame definition (also relocated alphabetically) and the rollers definition, making terminology more consistent and functional requirements clearer.
❓ Q: Why was the lifting frame definition relocated?
A: To keep Section 2 terms ordered alphabetically; the definition was repositioned with the revision so it can be found quickly.
A: To keep Section 2 terms ordered alphabetically; the definition was repositioned with the revision so it can be found quickly.
❓ Q: How does Addenda (a) affect inspection work?
A: The revised terms and clauses give inspectors clearer criteria; update inspection forms with the new lifting frame, rollers, and warning-example check items.
A: The revised terms and clauses give inspectors clearer criteria; update inspection forms with the new lifting frame, rollers, and warning-example check items.
❓ Q: How do I confirm my copy of the standard is current?
A: Until an equivalent new edition is published, “PALD 11-1986 + 11a-1987 (and later addenda)” is the current effective version; check for margin note (a) and keep all replacement pages.
A: Until an equivalent new edition is published, “PALD 11-1986 + 11a-1987 (and later addenda)” is the current effective version; check for margin note (a) and keep all replacement pages.
