Round Baler Monitor Dead? Repair, Replace, or Bale Without It

By the XES Netting team — bale net-wrap manufacturer · Updated September 4, 2026 · ~16 min read

A baler monitor failure arrives at the worst possible time and with the worst possible advice attached. Here is the version most owners hear first:

"the bale monitor/computer on my mid-size NH590 baler is not working. I have been told there is no way to repair or replace this and I must replace my baler. Perfectly good baler, do not want to replace it."

— hchris · HayTalk thread 28953

That advice is usually wrong, or at least premature. This guide is about what to do after you have diagnosed a monitor fault — sourcing, cost, compatibility and workarounds. If you are still diagnosing, start with round baler monitor troubleshooting, which covers the safe de-energised checks and the OEM diagnostic channels by brand.

First: prove the monitor is actually the fault

Monitors get blamed for problems they did not cause, because they are the part with the screen on it. The cheapest test available is a straight swap:

"Have you tried your monitor on the loaner baler? That would be my first test since it is quick and (somewhat) easy."

— dvcochran · HayTalk thread 100037

Note the direction of that test. Putting a known-good loaner monitor on your baler tells you less than putting your monitor on a known-good baler, because the first test leaves your harness and your power supply in the circuit. Swap both ways if you can.

The thread that advice came from is worth reading in full, because it ends the way a surprising number of these end. The owner had a wrap fault, borrowed a loaner monitor that worked flawlessly, bought a brand-new monitor that did not work, and then found this:

"I discovered that the 5/8 nut had backed off the bolt holding the battery cable to the fuse box connection. It was out to the end of the bolt."

— lwbeef · HayTalk thread 100037

"Yes it did. I wish I had located the problem before I purchased a new monitor"

— lwbeef · HayTalk thread 100037

Another operator in a separate thread describes the same class of fault from the other end — a new baler that would not cut net until the power supply was corrected:

"We finally went into the settings and we found we weren't getting enough power. Hooked to battery and everything was fine."

— steel, MI · AgTalk thread 1151813

Before you buy anything, confirm: supply voltage at the monitor under load (not just key-on), every pin in the tractor-to-baler connector fully seated and un-corroded, and the ground path. A monitor starved of volts behaves exactly like a failing monitor — intermittent wrap misses first, then dead. If your specific symptom is net-related rather than monitor-related, net wrap won't start or feed, net wrap won't cut and baler won't stop wrapping cover those branches.

Why a dead monitor stops net wrap but not always twine

This is the fact that should shape your whole decision, and it comes straight from the OEM rather than from us.

On John Deere's 467/467 Silage Special/567 generation, the operator's manual documents a hardware bypass for electronic failure. Its title is the important part: "Using Bypass Switch (Twine Wrap Only)." The manual states that the bypass switch "allows direct operation of the twine actuator in the event of an electronic failure," and the manual's manual-key page is equally explicit that the EXTEND and RETRACT keys operate the "twine actuator only."

Operators describe the twine bypass accurately:

"Some of the JD balers that I've had over the years had a manual tie switch in the main harness. Could tie and bypass the monitor."

— dakota, SC North Dakota · AgTalk thread 1172649

"You can run the baler manually though, not as nice as using the operators panel, but you can at least bale hay. Have your dealer look in the service manual on what is required. NH had a kit so the baler could be ran manually, but I made my own using a switch."

— mike10 · HayTalk thread 28953

If a season on twine is genuinely your fallback, price it honestly first — twine is slower per bale and weathers worse outside. Our net wrap vs. twine comparison has the per-bale numbers, and net-wrapped bale storage outside covers the shedding difference.

The four options, compared

This table is a decision aid, not a ranking. Which route is right depends almost entirely on how obsolete your machine is and how soon you need to bale.

One operator's view on running without, which is worth weighing against the optimism above:

"It is not idea to bale without the monitor for shaping the bales. I have done it to finish a cutting when a monitor has gone on the fritz, but I always got it working again before the next time I needed to"

— GusFarms, On the Papio, Nothwest of Omaha. · AgTalk thread 1161539

What operators actually paid

These are individual reports from specific years, in the currency stated, for specific machines. They are order-of-magnitude signals to help you judge a quote — nothing more. The table is unranked.

The harness line is the one people forget. A monitor bought without its matching harness may not be a complete solution:

"The tractor harness for the baler should be worth something too if its not ruined. I needed one for a NH and couldn’t find a used one for anything, had to buy a new one."

— Gearclash, Sioux County, NWIA · AgTalk thread 865535

There is also a purchasing wrinkle worth asking your dealer about directly:

"If buying a new one from Deere buy it through whole goods number verses parts. It will be the same price but will come with the cab harness included."

— gfd_703 · AgTalk thread 999240

We cannot verify that ordering route and it may well have changed — but it costs nothing to ask the parts counter to price it both ways.

Used and salvage units: the three compatibility traps

The obvious move is to buy a used monitor. It is also the move most likely to waste your money, for three specific reasons.

Trap 1: they are scarcer than you would expect

Monitors do not usually get parted out, because they do not usually fail. They also tend to stay with the machine. Two operators explain the market from opposite directions:

"Last summer I needed a new monitor for my 567. Couldn’t find one in any junkyard, anywhere, in the Midwest. Why? Because everyone who trades balers often has two monitors."

— farmernelson88, South Central Iowa · AgTalk thread 999240

"Hope you bought it cheap enough to spend $2500, because you probably won’t find a used one out there. Unless the baler burned, they just keep running..."

— c_mayer, Jeffersonville, OH · AgTalk thread 1204206

The corollary — noted repeatedly in these threads — is that fire-damaged balers are the main source of salvage monitors, and a monitor that survived a shop fire may still be sound:

"Had a 567 and the original monitor burnt in a shop fire. I ended up buying 2 out of salvage after that and still have one here."

— mindeere, SW Minnesota · AgTalk thread 1203881

Trap 2: the connector generation changed mid-family

This is the one that catches people who correctly identify a "compatible" model. A HayTalk thread about adapting a JD 466 monitor to a 467 lays it out:

"The 466 monitor has a rectangular wiring plug where as the 467 has a round plug. Can they be adapted? A new monitor in Australia is around $3500 from JD. I have looked inside the Baletrak monitors that he has and they are completely different in their inside components."

— linlee · HayTalk thread 99292

"466 monitor wiring harness is $1100 USD"

— Tx Jim · HayTalk thread 99292

The same generational break shows up around the Deere 566/567 boundary, where the net wrap circuit itself changed:

"566 and 567 monitor are different in the way they power the net wrap. 560M monitor will have the settings in it for everything back to a 567. If string only a 566 and 567 will interchange."

— gfd_703 · AgTalk thread 999240

Read that carefully: a monitor can interchange for twine and still not run net. If you net wrap, "it powers up and the twine arms move" is not a passing test. Verify the wrap function specifically. This matters most on the 67-series Deeres — see our John Deere 567 net wrap guide for how that generation's wrap circuit and detection paddle behave.

Trap 3: "remanufactured" may not mean what you want it to mean

"I'm unaware of a reliable reman monitor. Have you checked with any rd baler salvage yards?"

— Tx Jim · HayTalk thread 100037

Ask a prospective supplier three questions before paying: what exactly was replaced, is it tested on a running baler or only bench-tested, and what happens if it does not work on your machine. A repair shop that will state its test procedure is worth more than one quoting the lowest price.

Setting the model program on a replacement monitor

Here is a failure mode that looks catastrophic and is not. An operator fitted a factory-remanufactured Deere monitor and got nothing:

"I had monitor issues with my 854 and purchased a remanufatured from Deere. Hooked it up and nothing worked. Come to find it wasn't set to my model and needed a software update. After that, it worked flawlessly."

— haysprout · HayTalk thread 100037

This is documented behaviour, not a defect. John Deere's operator's manual for the 467/467S/567 has a page titled "Changing Baler Model Program" which states:

"The monitor-controller software includes two baler model programs-467 and 567. Each program is written specifically for the baler model for which the monitor-controller was originally supplied.

When replacing monitor-controller with a new unit, or moving monitor-controller to a different model baler, review and revise the model program if necessary.

NOTE: The twine system will not operate correctly unless the displayed model number agrees with the baler model number."

— John Deere, Changing Baler Model Program, OME126851

So: a replacement monitor that "does not work" may simply be programmed for the wrong machine. Check the model program before you conclude the unit is bad or start returning parts. Every brand has an equivalent setup step — the channel numbers and key sequences differ, so use your own manual. Round baler monitor troubleshooting lists where to find the diagnostic and setup documentation by brand, including New Holland Bale Command, Vermeer, Case IH and AGCO.

What a swapped monitor does to the bale count

The monitor is the baler's odometer, so moving one has consequences for the machine's recorded history. The forums treat this with dark humour:

"Depends how many bales it has on it. I wonder how many people have 2 monitors. One with 20,000 bales on it and the other with 6000 when they want to trade it in."

— learner, south west mn · AgTalk thread 865535

The manual is more precise than the folklore, and the detail is useful whether you are buying or selling. On the 467/567 BaleTrak PLUS there are two counters:

• "The RESETABLE counter can be cleared or modified as desired, while the TOTAL BALE counter cannot be reset or cleared." The resettable count can be raised or lowered deliberately — the manual describes doing so to add fields together or remove aborted bales.
• "When using EXTEND (A) and RETRACT (B) keys, bale counter will not register additional bales." Bales finished manually do not increment the counters at all.

Two practical takeaways:

1. If you are buying, ask for the TOTAL count, not the one on the screen. The resettable figure is a field tally and is explicitly modifiable. Confirm which counter you are being shown, and sanity-check it against wear on sprockets, belts and rollers — the physical condition of the machine is the honest odometer. Our used round baler buying guide covers that inspection.
2. If you fit a replacement monitor, its counts come with it. Record your old machine's total before the swap and keep it with the service file, or you have permanently lost the machine's history.

Preventing the next failure: power it properly

The most consistent theme across every one of these threads is power quality. Monitors and wrap actuators are current-hungry and unforgiving of voltage drop. One operator's account ties the failure mode directly to the supply:

"Running the monitor with cab power is hard on the relays in the monitor, sent my monitor off to ag express to get new relays put in it after 20k bales as it was was starting to miss wrapping a few bales."

— wire farms, Nebraska · AgTalk thread 1151813

"Vermeer and new holland on both balers insisted they could only be hooked up directly to the battery due to inconsistent voltages out of the power plug in the cab. The actuators need a consistent voltage."

— centralmnangus, Ft. Ripley MN · AgTalk thread 1151813

Opinions genuinely differ — several operators report tens of thousands of bales through a cab convenience outlet with no trouble at all, and on some machines the 12 V plug is how the manufacturer intended it to be powered. The defensible position is: follow your own manual's specified supply, and if you are chasing intermittent wrap misses, test the supply under load before you condemn the monitor. "Starting to miss wrapping a few bales" is the classic early warning, and it is far cheaper to fix as a wiring job than as a monitor.

Alongside power, the routine care that keeps these systems alive is unglamorous: keep the tractor-to-baler connector clean and capped, do not let the monitor sit in a wet cab or an unheated shed over winter, and store it indoors during the off-season. Winterizing a baler covers the rest of the off-season checklist, and chains and bearings service covers the mechanical side.

Frequently asked questions

Can you run a round baler without a monitor?

Partly, and it depends on the machine and on whether you tie with twine or net. John Deere's 467/467S/567 manual documents a bypass switch for electronic failure that is explicitly labelled "Twine Wrap Only," and its manual EXTEND and RETRACT keys operate the twine actuator only. So on that generation a bypass gets you twine, not net wrap. You also lose bale-shape indication and automatic cycling. Check your own manual for what your machine's bypass actually drives.

My baler monitor is discontinued. Do I have to replace the baler?

Usually not. Operators routinely report three alternatives to a new OEM unit: board-level repair or rebuild by an agricultural electronics shop, a used unit from a salvaged or fire-damaged baler, or a compatible unit from a neighbouring model in the same family. Verify the connector type and harness compatibility before buying, because the connector style changed within some model families.

How much does it cost to repair a baler monitor?

Operator reports range widely by fault. A touch-face console replacement on a Case IH 8465A was reported at around $150; a complete rebuild of a John Deere 535 monitor including a wiring harness was reported at around $700. New OEM units were reported at roughly $2,500 from AGCO for a Massey Ferguson 1756 and about $3,500 from John Deere in Australia for a BaleTrak. These are individual anecdotes from specific years, not current quotes.

Why doesn't my replacement baler monitor work?

Check the model program before assuming the unit is faulty. John Deere's manual states the monitor-controller software contains separate programs for each baler model, that you should review and revise the program when fitting a new unit or moving one between machines, and that the twine system will not operate correctly unless the displayed model number matches the baler. One operator's factory-remanufactured unit did nothing until it was set to the right model and updated.

Will a monitor from a different baler model work on mine?

Sometimes, but verify the wrap function specifically rather than just power-up and twine. Operators report that within the John Deere 66/67-series break, a 566 monitor will run twine on a later machine but will not run the net, because the net wrap is powered differently. Also check the connector: within the 466/467 family the plug changed from rectangular to round, and the harness is a substantial separate cost.

Can a baler's bale count be reset?

On the John Deere BaleTrak PLUS there are two counters. The manual states the RESETABLE counter can be cleared or modified as desired, while the TOTAL BALE counter cannot be reset or cleared. It also notes that bales finished with the manual EXTEND and RETRACT keys do not register on the counters at all. When buying a used baler, ask specifically for the total count and check it against physical wear.

Should a baler monitor be wired to the battery or the cab outlet?

Follow your manual — practice genuinely varies by brand and machine. Some operators report tens of thousands of bales through a cab convenience outlet without trouble, while others report that Vermeer and New Holland required a direct battery connection because the actuators need consistent voltage. What is not in dispute is that voltage drop causes intermittent wrap misses that mimic a failing monitor, so test the supply under load before replacing anything.

Manual evidence was read directly from John Deere's public operator's manual OME126851 (467, 467 Silage Special, and 567 Round Balers) at manuals.deere.com on September 4, 2026 — specifically the Using Bypass Switch (Twine Wrap Only), Using Manual Actuator/Wrap/Bypass Switches, Changing Baler Model Program, and Viewing and Resetting Bale Counters pages. That manual covers one Deere family only; equivalent behaviour on New Holland, Vermeer, Case IH, Krone and AGCO machines is not asserted here and must be confirmed against those manuals. All prices are individual operator reports from the year of the cited post, in the currency stated, and are neither current nor quotations. Repair companies named inside operator quotations are reported as part of the quotation and are not endorsed or verified by XES; we have no commercial relationship with any of them. Phone numbers present in the original posts have been omitted.