Milwaukee 2904-20: problems, parts and running costs

Checked: 2026-10-19

Summary

Owners most often report chuck trouble: wobbling bits, runout that warranty service did not always fix, and chucks that seize or will not grip; ice anglers add gear-like clicking and cutoff on large augers [11][13][24][25]. Charging a 5Ah pack costs about $2.25 per year in electricity (100 full-equivalent recharges at $0.20/kWh and 80% efficiency), while cutting consumables and the occasional $49.13–$179.80 repair are the real running cost [10][17][18]. At $229 bare (October 2026) it is fair value mainly for existing M18 owners; the $329 2904-22 kit is the more practical first buy [6][19].

Common problems and fixes

Chuck runout and wobbling bits — r/MilwaukeeTool owners describe a visibly wobbling bit; one April 2026 owner sent a new drill in twice with the runout unresolved [11], while a March 2026 owner’s wobble followed an eight-foot fall, which is impact damage and not a manufacturing fault [14][16]. Nobody has published a failure rate; check straight bits in several orientations before a job and document runout on video, then use warranty service for an undropped tool [11].
Chuck seizes or will not grip or release — a September 2023 owner reported the chuck tightening so firmly on a bit it could not be released normally, and replacing the chuck solved it [13]; a contrasting April 2026 claim ended with a replacement tool in about two weeks [12]. No onset period or frequency is known.
Gear clicking and cutoff on large augers — ice anglers reported gear-like clicking after roughly 30 holes on a new drill (January 2023) and bind/stall or kickback cutoff on a K-Drill (January 2024); no gearbox defect or service bulletin has been confirmed [24][25]. The manual’s fixes: reduce feed pressure when stalled, reverse to free a bound bit, clear debris, and use low gear and the side handle for high-load bits [2].
AUTOSTOP reads like a defect — five trigger pulls with the selector in center lock toggle AUTOSTOP, which ships on; owners have mistaken the behavior for a bad switch, and disabling it to hide recurring binding removes a key anti-kickback feature [2][15].
Crunch or grind on stopping — a May 2026 owner reported a slight crunch when the motor stopped; other owners read it as normal electronic braking, but that is not a Milwaukee diagnosis, so get worsening vibration or failure to stop assessed under warranty [26][16].
No battery or charger in the box — the bare tool ships with the tool, side handle and belt clip only, so buyers new to M18 must add a pack and charger, which can erase the bare-body price advantage over the $329 2904-22 kit [1][19].

Parts and consumables

All-metal keyless chuck (42-66-2720) — $49.13, out of stock on the checked page; needs the reverse-thread retaining screw 05-88-0019 at $2.00; replace only for diagnosed runout, jaw seizure or grip loss; the reverse-thread screw and factory torque spec make this a nontrivial DIY job [3][10].
Gearbox service assembly (14-29-2904) — $81.88, in stock; the May 2025 bulletin supersedes the 2023 part 14-29-5015, so match the full serial before ordering [3][10][29].
Electronics service assembly (14-20-6560) — $179.80, in stock; a large fraction of a $229 new bare tool; not a consumable [10][6].
Rotor assembly (16-07-2983) — $39.61, in stock; no service-life hours or replacement interval specified [10].
Housing service assembly (31-44-7060) — $16.45, in stock; damage repair, not preventive maintenance [10].
M18 XC5.0 battery (48-11-1850) — not included with the bare tool; Home Depot ran a $99 promotional price through July 19, 2026 (historical, not an October price); Milwaukee lists a three-year warranty on this pack [17][28][16].
M12/M18 charger (48-59-1812) — $89 at Home Depot, October 2026; not included with the bare tool [18][1].
Bits, hole saws and driver bits — third-party consumables whose wear depends on substrate; no model-specific annual bit schedule exists; do not use ordinary bits in hammer mode [2].

Yearly running cost

Electricity is minor: an XC5.0 pack is 90Wh (18V x 5.0Ah), so 100 full-equivalent recharges a year at 80% wall-to-cell efficiency and $0.20/kWh use about 11.25kWh, about $2.25 — an engineering estimate, not a metered figure; 300 charges would be about $6.75 [17][18]. There are no subscriptions, lubricants, cartridges or paid connectivity features on this non-ONE-KEY tool [2]. The real running cost is cutting consumables, which vary by work volume and material, and repairs, which cannot be annualized because no failure distribution is published; the listed out-of-warranty costs: $49.13 for a chuck, $81.88 for a gearbox and $179.80 for electronics [10]. The battery carries a three-year defect warranty with no mandatory replacement interval [16].

When it is a good buy

Home Depot, Ace Hardware, Tool Nut and Northern Tool all listed the bare tool at $229; the 2904-22 two-battery kit was $329 at Home Depot [6][7][8][9][19]. Used asking prices tracked a $115 median on October 6, 2026 with a middle half of $94.44–$136.51, but these are asking prices, not completed sales [27]. Thresholds: below $175 new bare is strong value; $175–199 is favorable; $200–229 is fair for M18 owners who need genuine hammer drilling; above $229 is hard to recommend when several shops show exactly $229. Named alternatives: the Milwaukee 2903-20 non-hammer drill at $219 (Home Depot, October 2026) is the better buy if hammer action is truly irrelevant [20]; the Makita XPH14Z at $199 suits owners already on Makita LXT [21]; the DEWALT DCD999B at $239 suits 20V MAX / FLEXVOLT owners [22].