Makita HM Z4G Review: A 40V Max XGT Dual-Battery Demolition Hammer That Means Business

Introduction

The Makita HM Z4G is the brand’s new cordless demolition hammer, unveiled at World of Concrete, and it is part of the 80V-class XGT 2x platform. Two batteries, one on each side, feed a tool that puts out 78.2 joules of impact energy and 870 impacts per minute. Makita claims it delivers similar breaking force to the comparable AC model, and it even fits the same trolley.

This is a serious tool for serious breaking work, and it comes with some serious numbers to match. Below is a full breakdown of what it offers, what it does well, and what you should think about before committing to one.

Weight and Power Delivery

Let’s get the heaviest topic out of the way first. The HM Z4G weighs roughly 25 kilograms as a bare tool, and the complete setup, with chisel and two large batteries fitted, tips the scales at around 32 kilograms. Every time the bit punches through a slab, you are heaving that full weight back up, and that gets tiring fast. Anyone planning all-day breaking work should take that seriously.

Runtime is another honest consideration. With two 8Ah batteries on board, you get roughly 20 minutes of continuous trigger-on breaking time. That sounds short, but in practice you rarely hold the trigger nonstop on a job this physical. Makita claims up to around 950 kilograms of concrete broken per pair of 8Ah batteries, though the exact yield depends on how big a chunk you take with each hit.

On the plus side, the anti-vibration technology (AVT) does a genuinely good job. Hand and body vibration felt noticeably better than expected during hard breaking, which matters a great deal on a tool this size.

Bits, Chuck, and Maintenance

The tool accepts 28mm hex bits, and the chuck handles both collared and non-collared styles. For a plain hex shank with a recess, you lift the chuck collar, align the bit groove with the internal cam, drop the bit in, and lock it down. With collared bits, the collar sits in the raised position so it retains the bit during hammer action.

Greasing the chuck periodically is part of ownership, so factor that into your maintenance routine. The plastic housing parts are PA6 with 30% glass fibre, which suggests decent durability on the external bodywork.

Dust Extraction and Controls

Up top there is an AWS interface, so you can hook the tool to a compatible vacuum through a hose to pull dust away from the work area. A dust extraction shroud wraps around the chisel and clips in place, and the vacuum switches on automatically with the trigger. In practice this works best on smooth, flat concrete and captures mostly fine dust; on uneven or debris-covered surfaces, expect less benefit. In some regions the dust extraction unit is an optional accessory, while the AWS chip, side handle, and hex wrench come as standard.

The controls are sensible. A power button with a green status light doubles as a battery gauge, flashing red when charge runs low. A separate maintenance indicator flashes at around 45 hours of run time and goes solid near 50 hours, at which point the manual explains the reset procedure. The power button stays on for a generous stretch, so you are not constantly re-arming the tool while repositioning it.

The trigger sits on the right handle, but the body is designed so it operates essentially the same from either side, so left-handed users are well served. A soft start also deserves a mention: with light pressure the tool only gently taps, and it ramps up to full hammering once you lean into it, then stops hammering hard the moment you ease off.

Things to Consider Before Buying

Beyond weight and runtime, a few practical points are worth weighing. Standard in the box (depending on region) are the AWS chip, side handle, and a hex wrench; the trolley, dust extraction hose, and additional scaling and cold chisel bits are all optional extras. The tool is made in Japan, and the build includes PA6 glass-reinforced housings for the plastic components.

Buying Advice

If you break concrete regularly and want to stay cordless, the HM Z4G is one of the most capable options going, with AC-model-level breaking force, genuinely good vibration damping, and dust extraction compatibility for site requirements. If you only smash the occasional slab, the weight and the cost of a dual-battery XGT setup may be hard to justify.

Conclusion

The Makita HM Z4G does the job, and does it well: strong impact energy, thoughtful controls, effective AVT, and real dust management options. The honest trade-off is weight and modest continuous runtime, so plan your batteries and your back accordingly. For contractors with regular breaking work, it is an easy tool to recommend.