DZG Electric Grease Lubricator

What a DZG Lubricator Does

The DZG electric grease lubricator delivers a fixed 6 ml per minute of grease to bearings, slides, and other lubrication points on machine tools and production machinery. The unit runs on either 220 V or 380 V, so the model choice follows the machine supply voltage. A built-in timer and controller switch the pump on and off according to the schedule you set. The pump output is fixed, not adjustable, which keeps metering predictable across every cycle.

Each DZG unit carries a reservoir of 2 L, 4 L, 6 L, or 8 L. The pump can feed one, two, or three outlets, but the 6 ml per minute figure is the total pump output. When two or three outlets are used, they share that total. This page covers the generic DZG unit. The P203 grease pump page covers the branded retrofit side for aftermarket replacement work.

The DZG suits machines that need a steady, repeatable grease supply rather than variable dosing. The motor draws 60 W and the pump is rated at 25 MPa, which is 250 bar or 3,625 PSI. The outlet thread is M12x1.5 or Rp1/4, depending on the configuration you order. The tank material is metal or ABS/PP, and an optional low-level switch can signal when the reservoir needs refilling.

Declared Specifications

Voltage and Tank Selection

Choose the DZG-220 when the machine supply is 220 V. Choose the DZG-380 when the machine supply is 380 V. The order code prefix changes with the voltage: 20704-XXX for the 220 V model and 20705-XXX for the 380 V model. Matching the pump voltage to the machine supply avoids the need for a separate transformer.

Tank size follows the number of lubrication points and the refill interval you want. A 2 L reservoir suits bench machines with a small point count. A 4 L reservoir covers most standalone production machines. The 6 L and 8 L reservoirs fit lines where refilling less often matters more than cabinet space. The lubrication oil pump guide explains how reservoir sizing works for oil systems, and the same logic applies to grease.

Outlet count is independent of tank size. A 2 L unit can have one, two, or three outlets, and an 8 L unit can have one outlet if the line layout calls for it. The outlet thread choice, M12x1.5 or Rp1/4, depends on the fittings already on the machine. Confirm the thread when ordering if the existing hardware is not documented. Settle the voltage, tank, outlet, and thread choices through the quotation contact page.

Total Flow vs Per-Outlet Flow

The 6 ml per minute figure is the total pump output, not the output per outlet. A one-outlet DZG delivers the full 6 ml per minute to that single line. A two-outlet DZG splits the same 6 ml per minute across both lines, and a three-outlet unit splits it across three lines. The split is not necessarily equal because downstream restriction and line length affect distribution.

This matters when you plan the lubrication layout. If each point needs 6 ml per minute, you need one DZG per point or a progressive divider arrangement that cycles the full output to different points in sequence. The ZP-A progressive blocks page shows how divider blocks distribute grease from a single pump line. The single-line lubrication system overview covers the layout principles behind this approach.

Fixed total output means the controller schedule, not the pump, determines how much grease each point receives over time. A shorter on-time delivers less grease per cycle. A longer off-time reduces the daily total. The pump itself never changes speed or stroke.

Installation and Level Switch

Mount the DZG close to the lubrication points to keep line lengths short. The pump can be mounted on a machine frame or a nearby bracket. The outlet thread, M12x1.5 or Rp1/4, connects directly to the grease line or to a divider block inlet. The 2 L oil lubrication pump page shows a similar mounting approach for oil systems, though the DZG handles grease.

The optional low-level switch sends a signal when the reservoir drops below a set point. Wire that signal into the machine alarm input or a status light. The switch does not stop the pump by itself; it only reports the level. Thermal overload protection is included and stops the motor if it runs too hot, then allows a restart after cooling.

The built-in timer and controller handle the on/off schedule. Set the on-time and off-time to match the grease demand of the machine. The controller does not vary the 6 ml per minute output; it only changes how long and how often the pump runs. For electrical supply details beyond voltage, the electrical trochoidal pump guide covers wiring and control concepts that also apply here.

Grease Range and Limits

The DZG works with grease between +5 and +50 °C. Below +5 °C the grease stiffens and may not flow through the pump or lines. Above +50 °C the grease can separate or thin beyond what the metering expects. The ambient temperature range is -10 to +55 °C, so the pump can sit in a cold or hot room as long as the grease itself stays within its range.

Grease stiffness follows the NLGI scale, where a higher number means stiffer grease. NLGI 000 is the softest and NLGI 3 is the hardest. The DZG handles the range that flows at the declared pressure and temperature limits. Confirm the specific NLGI grade when ordering if the machine manual does not state it.

Fixed output works best with greases that stay consistent across the machine’s operating temperature. If the grease changes stiffness during a shift, the 6 ml per minute total may not reach every point evenly. The controller schedule can compensate by running more often, but it cannot change the output rate.

Frequently Asked Questions

Is 6 ml per minute the output per outlet or the pump total?

The 6 ml per minute figure is the total pump output. When the unit has two or three outlets, they share that total.

How do I choose between the 220 V and 380 V models?

Match the pump voltage to the machine supply voltage. The DZG-220 uses 220 V and the DZG-380 uses 380 V.

What tank size should I order?

A 2 L tank suits bench machines with few points. Larger tanks from 4 L to 8 L fit production lines that need longer refill intervals.

What does the low-level switch do?

The optional low-level switch sends an alarm input when the reservoir drops below a set point. It reports the level but does not stop the pump.

Can the DZG feed progressive divider blocks?

Yes, one DZG line can feed a progressive divider block. Confirm the divider layout when ordering to match the 6 ml per minute total.

Why is fixed output a feature instead of a limitation?

Fixed output keeps metering predictable because the pump never changes speed or stroke. The controller schedule determines how much grease each point receives over time.

What grease temperature range does the DZG accept?

The grease temperature range is +5 to +50 °C. The ambient range is -10 to +55 °C, but the grease itself must stay within its limits.

What is the enclosure rating?

The enclosure rating is not declared on this page. Confirm when ordering if the installation environment requires a specific rating.

What role does the built-in timer and controller play?

The timer and controller set the on-time and off-time schedule. They do not change the 6 ml per minute output rate.

Where can I get specifications and 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.

You can also use the contact for a quote page.