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ASME PALD 11-1986 — Wheel Dollies
📐 ASME PALD 11-1986 is the volume of the Safety Standards for Portable Automotive Lifting Devices that covers wheel dollies, approved as an American National Standard by ANSI on June 12, 1986. Wheel dollies are portable devices used in automotive service, maintenance, and storage to support and move vehicle wheels, tire assemblies, brake drums, and similar components. They let a single technician or a pair of technicians move heavy wheel assemblies safely, reducing back injuries and preventing dropped-load accidents that come with manual handling.
💡 Unlike a service jack, a wheel dolly is a handling aid: it supports and moves components. It works together with hoists or service pits when removing tires, brakes, and suspension parts, and it does not replace vehicle support stands.
1. Scope and General Framework 📌
This volume applies to portable wheel dollies used to lift and move wheels, tires, brake assemblies, and other vehicle components during automotive service, maintenance, and storage. As in the rest of the PALD series, its purposes are to guard against and mitigate injury to workers and protect life, limb, and property; to provide direction to purchasers, owners, employers, supervisors, and others responsible for its application; and to guide governments and other regulatory bodies in developing safety directives.
The Standard does not apply to similar devices designed and manufactured for other commercial or industrial use (e.g., equipment within the scope of ASME/ANSI B30.1). Operation and maintenance instructions are general; consult the manufacturer or supplier for specific instructions.
⚠️ A wheel dolly is a handling aid, not a lifting-and-supporting tool. It must not substitute for vehicle support stands (PALD-4) to sustain a raised vehicle, and it is not designed to carry the whole-vehicle load.
2. Definitions and Common Configurations 🔧
The Standard defines key terms such as lifting frame (the structure that contacts and supports the wheel), rollers (components that support the wheel and allow it to turn on the dolly), rated capacity, and operating controls. Typical wheel dollies come in fixed and adjustable configurations: adjustable models vary the frame width or height to fit different wheel and tire sizes.
| Configuration | Feature | Typical Load | Typical Use |
|---|---|---|---|
| Fixed | Fixed frame width | Specific passenger-car tires | Batch tire service, tire shops |
| Adjustable | Width/height adjustable | Multiple tire sizes, wheel assemblies | Multi-vehicle repair shops |
| Roller type | Rollers support and turn wheel | Brake drums, hub assemblies | Brake service, hub maintenance |
💡 When selecting a wheel dolly, set the capacity by the heaviest wheel assembly handled in the shop and prefer an adjustable-width model to cover more vehicle types.
3. Design Requirements and Safety Criteria 📏
Section 3 specifies design requirements centered on structural strength, stability, and capacity. The design must prevent functional damage to the lifting frame, rollers, and base at rated capacity and remain stable on a hard, level surface; rollers must turn freely and support the wheel reliably; and adjustable mechanisms must lock firmly so they cannot loosen during use.
🚨 Rated capacity is the upper limit of safe use. Overload permanently deforms or breaks the frame and rollers, letting the wheel fall and strike workers — never overload a wheel dolly.
4. Marking and Design Qualification Testing 🏷️
Section 4 requires clear, permanent marking of the manufacturer’s name or trademark, rated capacity, and accompanying safety warnings. Section 5, design qualification testing, requires a manufacturing sample to pass a proof load test verifying no functional damage or permanent deformation under a multiple of rated capacity.
| Test | Condition | Acceptance |
|---|---|---|
| Proof load test | Multiple of rated capacity applied | No functional damage, no permanent deformation |
| Stability test | Loaded on hard level surface | No tipping, no sliding |
| Roller function | Rotation check under load | Free rotation, reliable support |
| Adjustment mechanism | Adjustment and lock cycles | Firm locking, no accidental release |
💡 Like the service jack, the proof load test is a type test. In-service dollies still need periodic inspection of the frame, rollers, and locking mechanisms.
5. Operation, Maintenance, and Inspection 🛠️
Section 7 covers operation, maintenance, and inspection. When using a wheel dolly, stabilize the vehicle, place the dolly on a hard level surface, align the wheel assembly with the lifting frame, and confirm it is fully seated in the support position before moving; move slowly, avoiding sharp turns and slopes to prevent the wheel from slipping off.
- Pre-use check: frame free of cracks, rollers rotate freely, locking mechanism reliable.
- Loading: center the wheel assembly and confirm full seating in the frame support area.
- Moving: push slowly on hard level ground; avoid sudden stops and turns.
- Maintenance: periodically clean roller bearings, lubricate moving parts, inspect welds and bolts.
⚠️ You move not just weight but a high, irregular center of gravity. A poorly seated wheel assembly can easily tip the dolly — always confirm the wheel is fully seated before moving.
6. Engineering Practice Essentials 🚧
- 🔍 Selection: choose a dolly with capacity margin above the heaviest wheel assembly in the shop; prefer adjustable models for multi-vehicle shops.
- 🔧 Process integration: pair the dolly with hoists and service pits to form the standard “lift — receive wheel on dolly — move — position” work chain.
- 📊 Shop management: keep a dolly register and periodic inspection system; tag out damaged units.
- 📋 Training: brief operators on loading and pushing safety, emphasizing center-of-gravity control and anti-tipping.
7. Frequently Asked Questions ❓
❓ Q: What is the difference between a wheel dolly and vehicle support stands (PALD-4)?
A: A wheel dolly supports and moves wheel assemblies — a handling aid. Vehicle support stands sustain a raised vehicle. Their purposes differ and they are not interchangeable.
A: A wheel dolly supports and moves wheel assemblies — a handling aid. Vehicle support stands sustain a raised vehicle. Their purposes differ and they are not interchangeable.
❓ Q: Can a wheel dolly carry a whole vehicle?
A: No. A wheel dolly is designed to support wheel components, with capacity set for wheel assemblies. It must not support a whole vehicle or carry the entire vehicle load.
A: No. A wheel dolly is designed to support wheel components, with capacity set for wheel assemblies. It must not support a whole vehicle or carry the entire vehicle load.
❓ Q: When should a wheel dolly be removed from service?
A: Remove it when the frame shows cracks, permanent deformation, roller binding, or locking failure — send it for repair or scrap it rather than continuing to use it.
A: Remove it when the frame shows cracks, permanent deformation, roller binding, or locking failure — send it for repair or scrap it rather than continuing to use it.
🔍 Q: Why must an adjustable dolly be locked after adjustment?
A: An unlocked adjustment can loosen during loading and pushing, changing the frame width and letting the wheel slip and tip. Always confirm firm locking after every adjustment.
A: An unlocked adjustment can loosen during loading and pushing, changing the frame width and letting the wheel slip and tip. Always confirm firm locking after every adjustment.
