What the 25058-2 Is
The 25058-2 is a hand-operated grease pump for small centralized lubrication circuits. It has a 1 liter reservoir and delivers a fixed 1 ml of grease per full lever cycle. The pump is intended for machines where no electrical or compressed air supply is available at the lubrication point.
Bijur and Delimon are trademarks of their respective owners.
This is an aftermarket pump, not manufactured, sponsored, or endorsed by Bijur Delimon.
Bijur Delimon part numbers are for cross-reference identification only.
The outlet uses an M8 thread. Rated discharge pressure is 15 MPa (150 bar). The pump is listed for single-line resistance (SLR) systems and positive displacement injector (PDI) systems.
Specifications
| Part number | 25058-2 |
| Series | SZ hand grease pump |
| Reservoir | 1 liter |
| Discharge per cycle | 1 ml, fixed |
| Rated pressure | 15 MPa (150 bar) |
| Outlet | M8 thread |
| Systems | Single-line resistance (SLR), positive displacement injector (PDI) |
| Operation | Hand lever only, no electricity, no compressed air |
How a Hand Grease Pump Works
Each full lever stroke moves 1 ml of grease from the reservoir into the outlet circuit. An internal check valve prevents return flow when the lever is released. The operator controls the amount of grease delivered by counting full strokes.
To find the number of strokes needed, take the grease volume per interval from the machine lubrication schedule and divide that volume by 1 ml per stroke. For example, a schedule calling for 6 ml per interval requires 6 full lever cycles.
Stroke counting replaces a timer or controller. The pump has no motor, no solenoid, and no air valve. Delivery stops when the operator stops moving the lever.
SLR and PDI Systems
In a single-line resistance system, the pump pressurizes one line that feeds several metering points. Grease flows to each point based on line resistance. The operator must complete enough strokes to satisfy the total volume required by all points on the circuit.
In a PDI system, positive displacement injectors meter a set volume to each point. The pump supplies pressure and volume to the injector manifold. Each injector discharges only after receiving its required input volume, so stroke count still controls the total grease delivered.
Because the pump has no timer, the operator is the control system. The lubrication schedule must state the total grease volume per interval. Divide that total by 1 ml per stroke to get the required lever cycles.
Choosing 1 L or 0.4 L
The 25058-2 has a 1 liter reservoir. The same supplier listing also shows the SZ-1 hand pump as part 35018, available with 0.4 L and 1 L reservoirs, rated at 15 MPa and 1 ml per stroke. Distributor listings elsewhere identify 25018-2 as a 0.4 L version.
Choose the reservoir size by point count and service interval. A machine with few points and a short interval may run for weeks on 0.4 L. A machine with more points or a longer interval may need 1 L to avoid frequent refilling.
If you need the 0.4 L version, confirm the exact part number with the supplier before ordering. The 25018-2 designation appears in distributor listings, but the supplier listing uses 35018 for the SZ-1 family.
Related Parts
See the manual oil pump for oil-based circuits that need hand operation.
Check compression bushings for tubing connections on small lubrication lines.
Read centralized lubrication systems for an overview of SLR, PDI, and other layouts.
Request a quote through the quotation form.
Frequently Asked Questions
What grease can I use in the 25058-2?
Consistency grade limits are not published for this listing. Confirm the grease grade for the specific unit before filling the reservoir.
How many strokes does my machine need per interval?
Take the grease volume per interval from the machine lubrication schedule. Divide that volume by 1 ml per stroke to get the stroke count.
Can I adjust the output per stroke?
No, the discharge is fixed at 1 ml per full lever cycle. Output is not adjustable on this pump.
What should I do if the lever becomes very hard?
Stop and check for a blocked line or wrong grease. Do not force the lever if resistance is unusually high.
Does this pump need electricity or air?
No, the pump is hand lever operated only. It needs no electrical supply and no compressed air.
What outlet thread does the pump have?
The outlet thread is M8. No other outlet thread is confirmed for this listing.
Can I use this pump with a progressive system?
Progressive-system use is not confirmed for this listing. The pump is listed for SLR and PDI systems only.
How do I keep the pump working reliably?
Refill with clean grease only and keep contamination out of the reservoir. Inspect the outlet line if delivery becomes inconsistent.
Is the 25058-2 the same as the 0.4 L version?
The 25058-2 has a 1 liter reservoir. Distributor listings identify 25018-2 as a 0.4 L version, so confirm before ordering.
How do I order or get support?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
You can also request pricing through the quotation form. Include your point count and grease grade so a support engineer can confirm the fit.
