What This Pump Is
A 5 gallon manual lever-action oil bucket pump is a hand-operated transfer pump that mounts on a standard 5 gallon (19 L) pail and moves petroleum-based lubricating oil without power or compressed air. It threads onto the 2 inch NPS bung of the pail and uses a lever to lift a fixed volume of oil with each stroke.
- Moves oil from a standard 5 gallon (19 L) pail by hand lever action.
- Delivers a fixed volume per stroke: 2-3 oz (60-90 ml).
- Rated up to SAE 140 gear oil, the declared viscosity ceiling.
- Needs no power source or air supply at the point of use.
- Transfers oil only; it does not meter or batch measured volumes.
Field service crews use this style of pump for topping off reservoirs, gearboxes, and small sumps where electricity is not available and the volume moved per session is modest.
Specifications
| Specification | Value |
|---|---|
| Container fit | Standard 5 gallon (19 L) pail |
| Bung thread | 2 inch NPS |
| Output per stroke | 2-3 oz (60-90 ml) |
| Flow at steady stroking | 0.4-0.8 gal/min, viscosity dependent |
| Suction tube length | 12-18 in, fits standard pail depth |
| Maximum viscosity | SAE 140 gear oil |
| Operating temperature | 0°C to +60°C |
| Priming after container change | 2-3 strokes |
| Approved fluids | Petroleum-based lubricating oils |
These are the declared ratings for the unit. Confirm suction tube length and seal compatibility with the fluid data sheet before ordering.
Output per Stroke and Flow
This is a fixed-displacement hand pump: one full lever stroke moves 2-3 oz (60-90 ml) of oil, and the total volume scales with the stroke count. For an approximate delivered volume, count the strokes and multiply by the per-stroke output.
At a steady stroking rhythm the pump delivers 0.4-0.8 gal/min. That figure is viscosity dependent: light oil at a comfortable working temperature strokes easily, while oil near the SAE 140 ceiling moves more slowly.
Output also depends on the discharge path. Confirm the discharge hose size and end fitting pattern when ordering, and use the lubrication tubing and hose selection guide to match hose bore to your fittings.
If you want help confirming this pump against your fluid, pail, and duty cycle, send the details through our contact for a quote page.
Viscosity Limits and Cold Oil
The declared viscosity ceiling is SAE 140 gear oil. Petroleum-based engine, hydraulic, and gear oils within that ceiling stroke normally within the 0°C to +60°C operating temperature range.
Cold oil is the main reason a lever pump feels slow. As oil temperature drops toward 0°C, viscosity rises, lever effort increases, and flow per stroke falls before any hardware fault appears. Let the pail warm into the working temperature range before judging pump performance.
If the oil is warm and output is still low, check for an air leak at the bung, a blocked strainer, or a suction tube that sits above the oil surface. These are condition-based checks: perform them whenever output drops, not on a fixed schedule.
Fluids: What It Pumps and What It Does Not
This pump is built for petroleum-based lubricating oils: engine oil, hydraulic oil, and gear oil within the SAE 140 ceiling are all in scope. It is not for gasoline, solvents, or water-based fluids; use a pump rated for that fluid instead.
Seals are matched to petroleum oils. If your fluid is anything other than a standard petroleum-based lubricating oil, confirm seal compatibility with the fluid data sheet before ordering.
The pump transfers oil; it does not meter or batch. For measured dispensing at a set volume, use a metering unit built for that task.
For grease rather than oil, a grease pump is the correct tool, whether a hand grease pump for manual greasing points or an air grease pump where a compressed air supply exists.
Manual or Electric
Manual lever and electric bucket pumps solve the same transfer task with different drive styles. The manual pump suits field use with no power available and modest volumes. An electric bucket pump delivers continuous flow where a power supply exists.
| Trait | Manual lever pump | Electric bucket pump |
|---|---|---|
| Drive | Hand lever | Electric motor |
| Power needed | None | Electrical supply at the point of use |
| Output pattern | Fixed volume per stroke, 2-3 oz (60-90 ml) | Continuous flow while running |
| Best suited for | Field transfers without power | Frequent transfers where power exists |
If your site has power at the point of use and you move oil often, an electric unit may fit better than a hand lever.
Frequently Asked Questions
What is a 5 gallon manual oil bucket pump?
It is a lever-action pump that mounts on a standard 5 gallon pail and moves oil by hand. Each lever stroke lifts a fixed volume of oil out of the container.
Will this pump fit my pail?
It threads into a standard 2 inch NPS bung opening on a 5 gallon pail. The suction tube adjusts from 12 to 18 in to match standard pail depth.
How much oil does each stroke deliver?
Each full lever stroke delivers 2-3 oz (60-90 ml) of oil. At a steady stroking rhythm the pump sustains 0.4-0.8 gal/min, depending on viscosity.
Can it pump heavy gear oil?
The pump is rated up to SAE 140 gear oil at its viscosity ceiling. Cold oil near the low end of the temperature range slows stroking and reduces flow.
Can it pump gasoline or solvent?
No. It is built for petroleum-based lubricating oils only, so use a pump rated for that fluid.
Does the pump need priming?
Yes, expect 2-3 strokes to prime the pump after a container change. Keep the suction tube submerged so the pump does not pull air.
Why is the output slower than expected?
Slow output traces to cold oil, viscosity near the SAE 140 ceiling, an air leak at the bung, or a blocked strainer. Check these conditions in that order.
Does the pump meter or batch oil?
No, it transfers oil but does not meter or batch measured volumes. For measured dispensing, use a metering unit built for that task.
Should I choose a manual or electric bucket pump?
Pick the manual lever pump for field use with no power and a fixed volume per stroke. Where power exists and continuous flow matters, choose the electric bucket pump or contact us for a quote.
Who builds this pump and how do I request a quotation?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
