Bearing regreasing quantity & interval
A useful maintenance schedule needs the actual equipment duty, not a universal number of pumps or months.
On this page10 sections ⌄
What to check
Separate initial fill and replenishment
Initial bearing or housing fill is not the same quantity as a later replenishment. Grease-gun output varies; measure delivered mass when a procedure specifies grams.
Avoid excess and starvation
Overfilling can increase churning and temperature; too little lubricant can leave contact surfaces inadequately supplied. Use the documented fill and purge arrangement.
Adjust using evidence
Record run hours, speed, temperature and contamination trends. The calculator is an estimate for its stated assumptions, not a guaranteed service interval.
Direct answer
Separate replenishment from the initial bearing and housing fill. When an applicable maintenance method uses G = 0.005 × D × B, enter outside diameter and width in millimetres to obtain an estimated replenishment mass in grams. This does not set an interval or override the machine's procedure.
A worked replenishment example with explicit units
On a small screen, scroll the table sideways to read every column.
| Input or result | Value | Meaning |
|---|---|---|
| D | 52 mm | Bearing outside diameter, not bore |
| B | 15 mm | Bearing width used by this method |
| Calculation | 0.005 × 52 × 15 | Unit-specific empirical calculation |
| G | 3.9 g | Estimated replenishment mass, not initial housing fill |
The formula is published in Mobil's relubrication reference. It is a screening calculation for an applicable regreasable bearing arrangement. A sealed cartridge, an oil system or a proprietary hub is not authorised for this dose. Convert measured gun output to grams; do not translate 3.9 g into an assumed number of strokes.
Calculated quantity chart — illustrative geometry, not approved doses
On a small screen, scroll the table sideways to read every column.
| D (mm) | B (mm) | G = 0.005 DB (g) |
|---|---|---|
| 22 | 7 | 0.77 |
| 35 | 11 | 1.925 |
| 52 | 15 | 3.9 |
| 80 | 18 | 7.2 |
| 100 | 20 | 10 |
| 130 | 25 | 16.25 |
These rows are arithmetic examples, not manufacturer service quantities for every bearing of the same size. Verify that replenishment is intended and that this method applies before using a result. Do not round the number into a grease-gun stroke count without measuring the gun output.
What a useful lubrication schedule actually records
| Record | Why it changes the decision |
|---|---|
| Machine, bearing position and full designation | Different positions can have different arrangements |
| Lubricant and existing fill | The quantity does not determine compatibility |
| Operating hours, speed and load | Calendar time alone misses the actual duty |
| Temperature and environment | Heat, contamination and moisture affect lubricant condition |
| Shaft arrangement and delivery path | Orientation, inlet and discharge must match the method |
| Approved dose and next review | Keep the equipment requirement distinct from an estimate |
A published interval chart has conditions. Mobil's example is scoped to horizontal shafts, stationary machinery, normal load and a stated temperature range. Do not transfer the plotted hours to another duty without the applicable corrections and equipment evidence. No universal weekly, monthly or yearly schedule is supplied here.
When adding more grease is the wrong next action
| Observation | Next check |
|---|---|
| Temperature rose immediately after greasing | Quantity, discharge path and whether the correct point was serviced |
| A line will not accept the specified dose | Blockage and delivery system; do not simply increase pressure |
| Grease appears at an unintended seal or motor winding | Stop and investigate the route and seal condition |
| Roughness or noise persists | Bearing condition and failure cause, not only lubricant level |
Reference scope
Manufacturer and technical-institute records reviewed for this page: Mobil relubrication reference; JTEKT bearing lubrication methods; retrieved 2026-10-01 UTC. Values are a dated reference snapshot, not an OEM approval or a substitute for the current technical and safety documents. Original source addresses and retrieval evidence are retained in the private content audit.
Continue with real catalogue data
Preserve the full model, source description and unknown fields when making your shortlist. This reference website does not sell bearings or certify a replacement.
Related questions and tools
Grease vs oil bearing lubrication
Choose the lubrication system before choosing a product name.
Read and apply →Bearing grease viscosity vs NLGI consistency
NLGI grade and base-oil viscosity describe different properties.
Read and apply →Bearing grease compatibility: mixing & changeover
Grease colour does not identify its chemistry or establish compatibility.
Read and apply →Lithium, polyurea & moly bearing greases
A thickener or additive name alone does not define an approved bearing lubricant.
Read and apply →Sealed-for-life bearings: lubrication & maintenance
Sealed-for-life describes a maintenance concept, not infinite bearing or grease life.
Read and apply →High-temperature bearing lubrication checklist
Check the whole bearing system at temperature: lubricant, seals, cage, clearance and material stability.
Read and apply →Low-temperature bearing grease & starting torque
A bearing that runs acceptably when warm may struggle at a cold start.
Read and apply →High-speed bearing grease, oil-air & oil-mist checks
High-speed selection combines bearing geometry, lubricant supply, heat and preload.
Read and apply →Water exposure & food-grade bearing lubrication
A food-contact category and water resistance answer different questions.
Read and apply →Cleaning bearings before relubrication
Cleaning is a controlled maintenance operation, not a cure for damaged raceways.
Read and apply →Plain, linear & solid-lubricated bearing maintenance
Not every component in a bearing catalogue follows a rolling-bearing greasing procedure.
Read and apply →Wheel-bearing grease: NLGI ratings, types & product comparison
Choose wheel-bearing grease from the hub specification and service conditions, not its colour or the word 'premium'. Compare documented automotive and marine examples, then check the exact assembly before use.
Read and apply →Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.