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ASME PALD 12-1986 — Shop Cranes
📐 ASME PALD 12-1986 is the volume of the Safety Standards for Portable Automotive Lifting Devices that covers shop cranes, approved as an American National Standard by ANSI on October 16, 1986. A shop crane (also known as an engine hoist or portable gantry crane) is a portable lifting device used in automotive repair shops to lift and move heavy assemblies such as engines, transmissions, and differentials. Built around a chassis, mast, boom, and a hydraulic or mechanical hoist mechanism, it lets a shop perform heavy-component removal and handling without a fixed overhead crane.
💡 A shop crane is a portable hoisting device: it carries its own chassis and lifting mechanism and can be wheeled into position, making it ideal for shops without fixed lifting equipment.
1. Scope and General Framework 📌
This volume applies to portable shop cranes used to lift and move engines, transmissions, and other heavy vehicle assemblies 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 hoisting equipment designed and manufactured for other commercial or industrial use (e.g., industrial cranes within the ASME B30 series). Operation and maintenance instructions are general; consult the manufacturer or supplier for specific instructions.
⚠️ Shop cranes are for automotive service only. For industrial hoisting (equipment in the scope of e.g. B30.5 mobile cranes or B30.11 monorails), apply the corresponding industrial crane standards — do not mix them up.
2. Configurations and Components 🔧
A shop crane typically consists of a chassis (with casters), a mast, a boom, a hoist mechanism (hydraulic cylinder or mechanical), a hook, and counterweight provisions. Two main types exist by hoist mechanism: hydraulic (manual or electric pump drives a hydraulic cylinder to raise the boom — smooth, high capacity) and mechanical (screw, gear, or ratchet mechanisms — simple, for smaller capacities).
| Type | Hoist Mechanism | Typical Capacity | Features | Typical Use |
|---|---|---|---|---|
| Hydraulic | Cylinder + manual/electric pump | Commonly 0.5–2 ton | Variable-speed boom lift | Engine, transmission removal |
| Mechanical | Screw/gear/ratchet | Smaller | Simple, low maintenance | Light-assembly lifting |
💡 Select capacity by the heaviest assembly in the shop (e.g., engine with accessories) and account for how rated capacity varies with boom extension and angle — these are given by the manufacturer’s rating table.
3. Design Requirements and Safety Criteria 📏
Section 3 specifies design requirements centered on structural strength, stability, and anti-tipping. The design must prevent functional damage to the mast, boom, hoist, and chassis at rated capacity; the crane must not tip over with the boom at its most unfavorable position on hard, level ground; the hoist mechanism must hold the load reliably (no self-lowering from internal leakage in hydraulic units); and counterweight layout must keep the whole unit stable. Figure 1 shows a typical shop crane to illustrate the role of each component.
🚨 Shop crane overturning is a severe accident. The longer the boom, the heavier the load, and the lighter the chassis, the greater the overturning moment. Before use, confirm boom position, load weight, and ground conditions; use counterweights where necessary.
4. Marking and Design Qualification Testing 🏷️
Section 4 requires clear, permanent marking of the manufacturer’s name or trademark, rated lifting capacity, model, and accompanying safety warnings. Section 5, design qualification testing, requires a manufacturing sample to pass proof load and stability tests verifying no functional damage, permanent deformation, or tipping 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 at most unfavorable boom position | No tipping, no loss of stability |
| Hoist mechanism test | Full-stroke raise/lower cycles | Reliable load holding, no self-lowering |
| Chassis mobility test | Pushing while loaded | Free casters, smooth movement |
💡 Proof load and stability tests are type tests validating the design–manufacture combination. In-service shop cranes still need periodic inspection of mast welds, boom, hydraulic system, and casters.
5. Operation, Maintenance, and Inspection 🛠️
Section 7 covers operation, maintenance, and inspection. Place the crane on hard level ground and engage the caster brakes; align the hook over the assembly’s center of gravity and connect it securely; no personnel under the boom or load while lifting; move slowly with the load low and avoid sharp turns; lower the boom to a low parked position after the job.
- Pre-use check: mast and boom free of cracks and deformation, no hydraulic leaks, casters and brakes intact.
- Lifting: load weight within the rated capacity at that boom position; hook vertical over the center of gravity.
- Moving: keep the load low, level ground, avoid sudden stops, turns, and slopes.
- Maintenance: check hydraulic oil level and seals, lubricate moving parts, tighten bolts, inspect welds.
⚠️ Load holding is a key safety item: if the lift valve or seals of a hydraulic shop crane leak internally, the boom will lower itself during work and can strike workers. Any sign of self-lowering requires immediate removal from service and repair.
6. Engineering Practice Essentials 🚧
- 🔍 Selection: choose capacity by the heaviest assembly and maximum boom-reach need; prefer hydraulic units in high-frequency shops.
- 🔧 Lifting procedure: establish a standard “position — brake — connect — lift — move — lower” workflow with clear roles and hand signals.
- 📊 Shop management: keep a shop crane register and periodic inspection system; tag out damaged units.
- 📋 Training: brief operators on tipping risk, load holding, and ground-condition control.
7. Frequently Asked Questions ❓
❓ Q: What is the difference between a shop crane and a fixed overhead crane?
A: A shop crane is a portable unit with its own chassis and hoist that can be wheeled into position; an overhead crane runs on fixed rails. Shop cranes suit shops without fixed lifting equipment.
A: A shop crane is a portable unit with its own chassis and hoist that can be wheeled into position; an overhead crane runs on fixed rails. Shop cranes suit shops without fixed lifting equipment.
❓ Q: How much can a shop crane lift?
A: It depends on the model and boom position. Common hydraulic shop cranes rate roughly 0.5–2 tons, and capacity varies with boom extension and angle — always use the manufacturer’s rating table, never the nominal maximum blindly.
A: It depends on the model and boom position. Common hydraulic shop cranes rate roughly 0.5–2 tons, and capacity varies with boom extension and angle — always use the manufacturer’s rating table, never the nominal maximum blindly.
❓ Q: Why might a hydraulic shop crane lower itself?
A: Internal leakage past the lift valve or cylinder seals lets the load settle slowly without operator action. That is a serious hazard; any sign of self-lowering means immediate removal from service and hydraulic system repair.
A: Internal leakage past the lift valve or cylinder seals lets the load settle slowly without operator action. That is a serious hazard; any sign of self-lowering means immediate removal from service and hydraulic system repair.
❓ Q: How does this volume relate to the rest of the PALD series?
A: The PALD series is divided by equipment type: this volume (PALD 12) covers shop cranes, while jacks, wheel dollies, support stands, and other devices are covered by their own volumes. Each volume is self-contained, and they are used together in the workshop.
A: The PALD series is divided by equipment type: this volume (PALD 12) covers shop cranes, while jacks, wheel dollies, support stands, and other devices are covered by their own volumes. Each volume is self-contained, and they are used together in the workshop.
