The puller rating cannot make a thin cover or damaged bearing edge a sound gripping face. Trace the force through the actual fit, jaws, screw and supported shaft; confirm retained rings, nuts and shoulders before loading.
AI-generated reference material; not professionally verified or approved. Before use, a qualified person must review and adapt it to Singapore requirements, the actual equipment/site and approved safe work procedures.
Stop before starting
Do not load uncertain grip, capacity, alignment or support. Stop for slip, deformation, cracking or sharply increasing resistance; control access and unload by the specified method before inspection.
1. Legal and technical scope
| Basis | Scope and limits |
|---|---|
| MOM: Risk management | Assess pulling force, release path and changes in method. Official explanation of statutory duties; linked SSO text was not independently read for this item. This is not a legal opinion. |
| CCOHS: Hand Tools - Gear Pullers | Review alignment, grip and damaged-tool stops without importing its hammering example. Canadian technical guidance, not Singapore law. Its striking example is not adopted in this manual-only scope; actual model instructions govern. |
| WSH Council: Safe Use of Machinery | Coordinate preceding equipment isolation; manual screw load remains a separate stored-energy hazard. Official guidance; cited paid Singapore Standards were not obtained. No universal wheel test duration or gap is inferred. |
| SCDF: Emergency Medical Services | Use 995 for a Singapore emergency requiring ambulance or fire/rescue response. Official emergency-response information, not a site-specific rescue plan or authorisation for untrained rescue. |
Apply Singapore WSH risk management to tool failure, stored pulling force, projected parts and handling. Verify preceding machine isolation and shaft removal under the separate maintenance procedure; this task starts after safe detachment. The selected foreign puller guidance is technical reference only. Use the actual manufacturer limits for the permitted jaw configuration, reach, hand drive, lubrication and controlled unloading.
2. Scope and required inputs
Included work
Remove a bearing from an already detached, stably supported shaft using a manufacturer-permitted manual screw-type external puller, with identified gripping faces, shaft-end protection and receiving support.
Separate assessment
Hydraulic or blind internal pullers, heating, cutting, impact driving, installed shafts, spring-loaded assemblies and modified jaws require separate methods and assessment.
| Required input | Evidence to obtain |
|---|---|
| Identify parts and restraints | Part IDs and fit; Rings nuts and shoulders; Removal method basis; Drawing and condition |
| Support and shield | Shaft and support stability; Release path and protection; Bearing and tool support; People clear of line of force |
| Inspect puller | Model and rated limits; Jaws screw and links; Lubrication instructions; Configuration and reach |
| Set grip and alignment | Jaw contact and retention; Screw and shaft centre; Tip and end condition; Grip surface suitability |
No actual equipment model, site measurements, design calculations or signed approval was supplied. Check the applicable Singapore requirements and approved safe work procedures against the actual equipment and site before use. Statutory duties, official guidance and manufacturer limits serve different purposes; editorial checks do not establish legal or professional approval.
Singapore site application
Use mm for dimensions and the exact manufacturer force/torque units with their source; do not convert wrench effort into an invented allowable pulling force. Retain the site maintenance work order and separate shaft-removal isolation record.
3. Eight-stage JSA
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification | P | S | R | A |
|---|---|---|---|---|---|---|---|---|
| 1. Identify parts and restraints | 1. Retainer fracture2. Sudden bearing release3. Wrong fit removal4. Shaft damage | 1. Ring or nut overlooked2. Assembly history unclear3. Fit type assumed4. Drawing revision wrong | 1. Confirm bearing and shaft2. Locate retaining parts3. Review specified removal4. Match current drawing | 1. Part IDs and fit2. Rings nuts and shoulders3. Removal method basis4. Drawing and condition | ||||
| 2. Support and shield | 1. Shaft roll or drop2. Projected-part strike3. Bearing fall4. Bystander injury | 1. Support cannot resist force2. Release path exposed3. Catch support missing4. Access uncontrolled | 1. Secure shaft on stable support2. Provide specified shielding3. Support released parts4. Separate pulling zone | 1. Shaft and support stability2. Release path and protection3. Bearing and tool support4. People clear of line of force | ||||
| 3. Inspect puller | 1. Jaw fracture2. Screw seizure3. Unbalanced pull4. Unexpected grip loss | 1. Cracks or wear retained2. Lubrication omitted3. Wrong jaw combination4. Reach or rating unsuitable | 1. Inspect all load-bearing parts2. Use specified lubrication3. Match permitted configuration4. Verify rating and reach | 1. Model and rated limits2. Jaws screw and links3. Lubrication instructions4. Configuration and reach | ||||
| 4. Set grip and alignment | 1. Jaw slip2. Shaft-end damage3. Off-axis release4. Weak-edge failure | 1. Unequal engagement2. Wrong screw-tip support3. Screw not centred4. Cover used as grip | 1. Seat jaws on specified face2. Protect shaft end correctly3. Align screw with shaft4. Check load-bearing surface | 1. Jaw contact and retention2. Screw and shaft centre3. Tip and end condition4. Grip surface suitability | ||||
| 5. Apply manual force | 1. Part projection2. Jaw deformation3. Tool overload4. Support displacement | 1. Impact tool added2. Pipe extension used3. Resistance ignored4. Force path shifts | 1. Use permitted hand tool2. Apply controlled force3. Observe alignment changes4. Stop on abnormal resistance | 1. Force and displacement trend2. Jaw and screw position3. Support movement4. Permitted drive method | ||||
| 6. Recover released bearing | 1. Dropped bearing2. Residual-force release3. Pinched hands4. Puller fall | 1. Support absent at release2. Tool loosened under load3. Part caught by hand4. Tool not restrained | 1. Maintain receiving support2. Unload in specified sequence3. Keep hands clear of release4. Recover parts after unloading | 1. Bearing supported2. Residual loading controlled3. Tool stable for removal4. Safe retrieval position | ||||
| 7. Hold stuck assembly | 1. Puller rupture2. Fragment injury3. Heat-weakened tool4. Damaged shaft reuse | 1. Deformed jaw reloaded2. Hammering added3. Puller heated4. Damage not assessed | 1. Stop and control approach2. Use approved unloading3. Review alternative removal4. Inspect affected parts | 1. Stuck position and symptoms2. Unloading/restraint state3. Damage/method review4. Authorised restart basis | ||||
| 8. Inspect and transfer | 1. Sharp-edge cuts2. Unfit bearing reuse3. Defective puller reuse4. Lost part identity | 1. Damage handling uncontrolled2. Removal equals acceptance3. Tool returned unmarked4. Parts mixed in storage | 1. Handle damaged edges safely2. Assess parts separately3. Tag defective puller4. Transfer IDs and restrictions | 1. Shaft and bearing inspection2. Reuse or rejection status3. Puller condition record4. Receiving maintainer |
P = likelihood; S = severity; R = risk under the site method; A = site-defined acceptance/authorization. These actual assessment cells are blank. A low score never overrides a missing safeguard or a legal or manufacturer restriction.
4. Fictional scenario and failure mechanisms
This illustration provides educational context. It is not an actual incident photograph or evidence of equipment suitability; any AI-generated depiction is illustrative only.
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Stage | Fictional situation |
|---|---|
| Initial situation | A manual screw puller is fitted to a bearing on a removed shaft. |
| Changed condition | The bearing remains stationary and one jaw tilts outward. |
| Failure path | The operator proposes an extension pipe on the wrench. |
| Possible outcome | Loss of grip or tool fracture could project the loaded parts. |
| Prevention barrier | Stop loading, control access, unload by the specified method and reassess retainers, fit, grip, alignment and damage. |
Failure mechanisms
The puller rating cannot make a thin cover or damaged bearing edge a sound gripping face. Trace the force through the actual fit, jaws, screw and supported shaft; confirm retained rings, nuts and shoulders before loading.
Stored force remains even when the bearing has not moved. A jaw opening outwards or a sudden resistance increase requires a hold, exclusion and the specified unloading method before anyone repositions the tool. An added pipe or impact wrench changes the reviewed method.
The bearing and puller can move suddenly when the fit releases. Provide independent receiving support and suitable fragment protection; hands and a protective blanket do not establish stable support or permit overload.
Removal and reuse are separate decisions. Keep shaft/bearing identities and the observed force path with the condition assessment. Tag damaged puller components and transfer unresolved restrictions to the receiving maintainer.
Decision sequence
| Step | Decision |
|---|---|
| Known | Bearing stationary; jaw alignment changed. |
| Unknown | Remaining load, hidden retainer and condition of gripping face. |
| Hold | Do not add leverage, heat or impact. |
| Evidence | Safe unloading record, component inspection and actual model removal limits. |
| Restart | Use an accepted corrected arrangement or separately reviewed method; record release scope. |
Work sequence: Identify parts and restraints → Support and shield → Inspect puller → Set grip and alignment → Apply manual force → Recover released bearing → Hold stuck assembly → Inspect and transfer. This is a teaching flow, not a device drawing or a complete operating procedure.
5. Conditional decisions and common errors
| Situation | Required action | Evidence | Proceed when |
|---|---|---|---|
| Grip uncertain | Do not load | Face, reach and alignment | Arrangement accepted |
| Jaw deforms | Stop and control residual load | Unloading and damage record | Tool disposition resolved |
| Bearing stuck | Hold method change | Fit and retainer review | Revised method accepted |
| Bearing removed | Inspect before reuse | Shaft/bearing condition | Disposition recorded |
Similar observations, different decisions
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
| Observation | Insufficient conclusion | Required distinction |
|---|---|---|
| Sufficient nominal rating | Safe grip assumed | Face, reach, alignment and support still need checking |
| Blanket fitted | Overload allowed | Fragment protection supplements a sound load path |
| Bearing removed | Reusable part assumed | Apply separate shaft and bearing inspection criteria |
6. Roles and responsibilities
| Role | Responsibility |
|---|---|
| Work supervisor | Confirm part ids and fit and the task scope, resources, interfaces and stop authority. |
| Qualified technical reviewer | Review shaft and support stability, model limits, compatibility and unresolved technical conditions within assigned competence. |
| Work crew | Apply the listed controls, report changes and stop when evidence or safeguards are missing. |
| Inspector / assessor | Record actual force and displacement trend and other relevant checks; do not mark unverified conditions as accepted. |
| Handover authority | Reconcile shaft and bearing inspection, restrictions and outstanding actions before the next task. Role labels do not establish a legal credential. |
Supervision and handover focus
| Stage | Management action | Evidence |
|---|---|---|
| Identify parts and restraints | 1. Record part ids and fit2. Record rings nuts and shoulders3. Record removal method basis | 1. Part IDs and fit2. Rings nuts and shoulders3. Removal method basis |
| Support and shield | 1. Record shaft and support stability2. Record release path and protection3. Record bearing and tool support | 1. Shaft and support stability2. Release path and protection3. Bearing and tool support |
| Set grip and alignment | 1. Record jaw contact and retention2. Record screw and shaft centre3. Record tip and end condition | 1. Jaw contact and retention2. Screw and shaft centre3. Tip and end condition |
| Apply manual force | 1. Record force and displacement trend2. Record jaw and screw position3. Record support movement | 1. Force and displacement trend2. Jaw and screw position3. Support movement |
| Hold stuck assembly | 1. Record stuck position and symptoms2. Record unloading/restraint state3. Record damage/method review | 1. Stuck position and symptoms2. Unloading/restraint state3. Damage/method review |
| Inspect and transfer | 1. Record shaft and bearing inspection2. Record reuse or rejection status3. Record puller condition record | 1. Shaft and bearing inspection2. Reuse or rejection status3. Puller condition record |
7. Hold points and record comparison
| Hold point | Evidence before release | Actual approval |
|---|---|---|
| HP-0 Scope | Remove a bearing from an already detached, stably supported shaft using a manufacturer-permitted manual screw-type external puller, with identified gripping faces, shaft-end protection and receiving support. | |
| HP-1 Support and shield | Shaft and support stability; Release path and protection; Bearing and tool support; People clear of line of force | |
| HP-2 Set grip and alignment | Jaw contact and retention; Screw and shaft centre; Tip and end condition; Grip surface suitability | |
| HP-3 Hold stuck assembly | Stuck position and symptoms; Unloading/restraint state; Damage/method review; Authorised restart basis | |
| HP-4 Inspect and transfer | Shaft and bearing inspection; Reuse or rejection status; Puller condition record; Receiving maintainer |
Hold points are internal project checks. They are not universal statutory permits and do not grant work permission. Reassess after defects, changed conditions and shift changes.
Record comparison
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
The boxes are static record prompts, not interactive or saved approvals. A tick does not establish suitability or permission to restart. Record the evidence, person, time and unresolved issues; retain the change history.
| Record | Insufficient record | Record checklist |
|---|---|---|
| Identify parts and restraints | Only marked “OK” | □ Part IDs and fit□ Rings nuts and shoulders□ Removal method basis□ Drawing and condition |
| Set grip and alignment | Only marked “OK” | □ Jaw contact and retention□ Screw and shaft centre□ Tip and end condition□ Grip surface suitability |
| Hold stuck assembly | Only marked “OK” | □ Stuck position and symptoms□ Unloading/restraint state□ Damage/method review□ Authorised restart basis |
| Inspect and transfer | Only marked “OK” | □ Shaft and bearing inspection□ Reuse or rejection status□ Puller condition record□ Receiving maintainer |
8. Site checklist and emergency response
| Site check | Actual result | Person / action |
|---|---|---|
| Identify parts and restraints: Part IDs and fit; Rings nuts and shoulders; Removal method basis; Drawing and condition | ||
| Support and shield: Shaft and support stability; Release path and protection; Bearing and tool support; People clear of line of force | ||
| Inspect puller: Model and rated limits; Jaws screw and links; Lubrication instructions; Configuration and reach | ||
| Set grip and alignment: Jaw contact and retention; Screw and shaft centre; Tip and end condition; Grip surface suitability | ||
| Apply manual force: Force and displacement trend; Jaw and screw position; Support movement; Permitted drive method | ||
| Recover released bearing: Bearing supported; Residual loading controlled; Tool stable for removal; Safe retrieval position | ||
| Hold stuck assembly: Stuck position and symptoms; Unloading/restraint state; Damage/method review; Authorised restart basis | ||
| Inspect and transfer: Shaft and bearing inspection; Reuse or rejection status; Puller condition record; Receiving maintainer |
Stop work
Do not load uncertain grip, capacity, alignment or support. Stop for slip, deformation, cracking or sharply increasing resistance; control access and unload by the specified method before inspection.
Emergency response
Move clear of the force and fragment path. Do not strike, heat or dismantle a loaded puller. Arrange qualified controlled unloading; call 995 for serious injury and keep damaged parts isolated.
9. Sources and review limits
Public-source access/review: 2026-10-14.
| Official source | Reviewed scope and limits |
|---|---|
| MOM: Risk management | Assess pulling force, release path and changes in method. Official explanation of statutory duties; linked SSO text was not independently read for this item. This is not a legal opinion. |
| CCOHS: Hand Tools - Gear Pullers | Review alignment, grip and damaged-tool stops without importing its hammering example. Canadian technical guidance, not Singapore law. Its striking example is not adopted in this manual-only scope; actual model instructions govern. |
| WSH Council: Safe Use of Machinery | Coordinate preceding equipment isolation; manual screw load remains a separate stored-energy hazard. Official guidance; cited paid Singapore Standards were not obtained. No universal wheel test duration or gap is inferred. |
| SCDF: Emergency Medical Services | Use 995 for a Singapore emergency requiring ambulance or fire/rescue response. Official emergency-response information, not a site-specific rescue plan or authorisation for untrained rescue. |
No actual equipment model, site measurements, design calculations or signed approval was supplied. Check the applicable Singapore requirements and approved safe work procedures against the actual equipment and site before use. Statutory duties, official guidance and manufacturer limits serve different purposes; editorial checks do not establish legal or professional approval.
10. PDF guidance and FAQ
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. The article has eight stages with four items per main cell; each PDF has six key stages with three items per main cell. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
PDFs are complementary six-stage extracts. Apply all eight body stages and the actual equipment/site procedure.
May a pipe extension or impact wrench be added?
No. This scope uses the permitted manual drive; hold abnormal resistance and review the method.
Does a blanket make an uncertain grip safe?
No. Establish suitable grip, alignment, support and capacity first.
Can the released bearing be caught by hand?
Prepare separate receiving support and stay clear of the release path.
Is removal proof of reuse suitability?
No. Inspect and record shaft and bearing disposition separately.
Has a professional verified or approved this document?
AI-generated reference material; not professionally verified or approved. Before use, a qualified person must review and adapt it to Singapore requirements, the actual equipment/site and approved safe work procedures.
11. Revision history and authorship
AI-generated reference material; not professionally verified or approved. Before use, a qualified person must review and adapt it to Singapore requirements, the actual equipment/site and approved safe work procedures.
| Date | Version | Change | Review status |
|---|---|---|---|
| 2026-10-14 | SG 1.0 | New Singapore edition from assigned Korean source; task decisions, records and PDFs localized. | AI editorial review; no professional technical approval |
Korean edition revision history: 2026-09-26 (v1.0): initial article, sources, fictional analysis and PDF editorial checks. These are editorial records, not professional technical approval. Singapore v1.0 adapts the earlier edition to Singapore requirements and terminology.
Site reviewers must add their actual qualifications, scope, date and approval only after the review occurs.