Larger Hoist Models and Conflicting Chart Entries
- Match the complete hoist designation and geometry to its table.
- Read angle-specific capacities while retaining page attribution.
- Recognize unresolved PH625 conflicts and source limitations.
- Flashlight — Illuminate the hoist identification marking so the complete model suffix can be read.
- Shop rag — Remove surface dirt from identification markings without obscuring them.
- Tape measure — Check body length and overhang against the chart geometry; confirm the intended measurement reference points before comparing.
- Inspection mirror — Read identification markings in restricted locations without placing yourself beneath an unsupported body.
Model suffixes distinguish separate tables and cannot be ignored. On page 4, PH616-6 with a 12-foot body and 24-inch overhang is listed at 15.7 tons at 45° and 14.1 tons at 50°. For a 14-foot body and 18-inch overhang, that model is listed at 11.4 and 10.3 tons.
PH621-5 and PH621-6 have different entries for the same geometry. For a 16-foot body and 24-inch overhang, PH621-5 on page 4 is listed at 9.6 tons at 45° and 8.7 tons at 50°. PH621-6 on page 5 is listed at 13.9 and 12.5 tons for that same body and overhang.
The supplied document labels tables on both pages 5 and 6 as PH625, but overlapping geometries have different capacities. For an 18-foot body and 12-inch overhang, page 5 lists 9.9 tons at 45° and 8.9 tons at 50°, whereas page 6 lists 13.5 and 12.2 tons. The document does not explain this discrepancy, so these entries cannot be presented as one resolved rating.
Page 6 also lists PH625 with a 24-foot body and 24-inch overhang at 10.8 tons for 45° and 9.8 tons for 50°. Retain the page attribution when discussing this entry because of the duplicated model label. All tables remain subject to the document's general-guide limitation and its stated load, geometry, and pressure assumptions.
How It Works
Model identity comes before capacity
A suffix is part of the model designation, not an optional detail: PH621-5 and PH621-6 have different chart entries for the same body length and overhang. Identify the installed model, retain the table page, and match the geometry before reading the capacity column.
Geometry and angle affect lifting demand
Body length, overhang, and load position influence the turning effect that the hoist must overcome, while hoist geometry affects its mechanical advantage. Read the specified angle column rather than treating the capacities as interchangeable: page 4 lists PH616-6 with a 12-foot body and 24-inch overhang at 15.7 tons at 45° and 14.1 tons at 50°. All entries remain general-guide information subject to the document's stated load, geometry, and pressure assumptions.
Conflicting source entries are not resolved ratings
The supplied document labels tables on pages 5 and 6 as PH625 but gives different capacities for overlapping geometries without explaining why. Preserve both entries with their page references rather than selecting, averaging, or combining them into an application rating. Seek authoritative clarification before relying on either conflicting entry for the application.
Step-by-Step Procedure
0/7 donePage-Specific Hoist Entries
| Page 4: PH616-6, 12-foot body, 24-inch overhang | 15.7 tons at 45°; 14.1 tons at 50° |
| Page 4: PH621-5, 16-foot body, 24-inch overhang | 9.6 tons at 45°; 8.7 tons at 50° |
| Page 5: PH621-6, 16-foot body, 24-inch overhang | 13.9 tons at 45°; 12.5 tons at 50° |
| Page 5 PH625 label, 18-foot body, 12-inch overhang | 9.9 tons at 45°; 8.9 tons at 50°; conflicts with page 6 |
| Page 6 PH625 label, 18-foot body, 12-inch overhang | 13.5 tons at 45°; 12.2 tons at 50°; conflicts with page 5 |
| Page 6 PH625 label, 24-foot body, 24-inch overhang | 10.8 tons at 45°; 9.8 tons at 50° |
Diagnostic Chart
| Symptom | Check | Spec / Expected | Likely cause & fix |
|---|---|---|---|
| Different capacities are quoted for apparently identical hoists. | Read the complete model designation and compare the suffix, page, body length, overhang, and angle column. | For a 16-foot body and 24-inch overhang: page 4 PH621-5 lists 9.6 tons at 45° and 8.7 tons at 50°; page 5 PH621-6 lists 13.9 tons at 45° and 12.5 tons at 50°. | The model suffix may have been omitted, causing separate model tables to be treated as interchangeable. Basis: Bostail Power Hoist Capacity Chart |
| A PH616-6 lookup gives different answers despite matching body length and overhang. | Verify that the reader used the intended angle column and retained the page reference. | Page 4: PH616-6, 12-foot body, 24-inch overhang: 15.7 tons at 45°; 14.1 tons at 50°. | The capacity may have been read from the wrong angle column. Basis: Bostail Power Hoist Capacity Chart |
| Matching PH625 geometry produces conflicting capacities. | Compare the duplicated PH625 tables and record each result by page without declaring either the governing rating. | For an 18-foot body and 12-inch overhang: page 5 lists 9.9 tons at 45° and 8.9 tons at 50°; page 6 lists 13.5 tons at 45° and 12.2 tons at 50°. | The source contains an unexplained conflict between tables bearing the same model label. Basis: Bostail Power Hoist Capacity Chart |
| A PH625 capacity is being presented without its source page or limitations. | Restore the page attribution and the general-guide qualification, including the stated load, geometry, and pressure assumptions. | Page 6 PH625 label, 24-foot body, 24-inch overhang: 10.8 tons at 45°; 9.8 tons at 50°. | The entry has been detached from its source context despite the duplicated model label. Basis: Bostail Power Hoist Capacity Chart |
At the Bay: Diagnose the Case
CASE 1 / 4
Different capacities are quoted for apparently identical hoists.
- Test
- Compare
- Correct
Select the next check
Basis: Bostail Power Hoist Capacity Chart. A likely cause is a hypothesis; confirm it with the applicable service procedure before repair.
Common Bay Mistakes
- ✕ Dropping a model suffix when selecting a table.
- ✕ Matching body length but overlooking overhang or angle.
- ✕ Choosing the lower conflicting entry and calling the conflict resolved.
- ✕ Treating a general-guide chart entry as an unconditional application rating.
Quick Check
Practice only — not scored.
Plan the Service Sequence
Planning practice only. Follow the applicable manufacturer's instructions, employer safety program and qualified supervision on real equipment.
Plan the first action. Compare the service steps with the bay mistakes.
Hands-on: Shop Test Equipment
Dial Indicator — Bearing End Play
Magnetic-base dial indicator (0.001 in) on the hub face, spindle nut adjustment
🛠 Equip your bay for this test →Symptom: Bearing service — set end play after repack.
Spec limits used
- 0.001–0.010 in — Allowable end play, double-nut wheel end (Dexter 9-15K service manual, p.64)
- 0.008 in — Nev-R-Lube 50 mm max axial end play (Dexter 059-831-00)
- illustrative only — Face runout limit (General shop practice)
Simulated readings for practice. Always follow the manufacturer's procedure and values on a real trailer.
Source: Bostail Power Hoist Capacity Chart — 1, 4-6