{"id":1177,"date":"2026-07-29T03:28:12","date_gmt":"2026-07-29T03:28:12","guid":{"rendered":"https:\/\/foragebaler.com\/?p=1177"},"modified":"2026-07-29T03:28:12","modified_gmt":"2026-07-29T03:28:12","slug":"square-baler-not-tying","status":"publish","type":"post","link":"https:\/\/foragebaler.com\/pt\/square-baler-not-tying\/","title":{"rendered":"Square Baler Not Tying"},"content":{"rendered":"
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Troubleshooting Guide \u00b7 All 9YF Models \u00b7 12 Causes Covered<\/p>\n

Square Baler Not Tying: 12 Causes and How to Fix Each One<\/h1>\n

A square baler that stops tying \u2014 or ties intermittently \u2014 loses you crop, time and revenue during the narrowest weather window of the season. Every miss-tie has a specific mechanical or operational root cause. This guide covers all 12 causes, organised by diagnostic zone, so you can identify the exact problem and fix it without guesswork.<\/p>\n

Covers: twine path \u00b7 tension discs \u00b7 bill hooks \u00b7 needle timing \u00b7 cam wear \u00b7 PTO speed \u00b7 one-side vs both-side misses<\/p>\n

Veja a gama de enfardadeiras quadradas<\/a>
\nObtenha suporte t\u00e9cnico<\/a><\/div>\n<\/div>\n<\/div>\n

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Step 1: Locate the Problem Zone Before Touching Anything<\/h2>\n

The knotter system has four distinct zones \u2014 each responsible for a specific part of the tying cycle. Answering five quick questions locates your fault zone before you open a single cover, saving the time lost to checking the wrong components first.<\/p>\n

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Q1 \u2014 Pattern of miss<\/div>\n

Every bale?<\/strong> \u2192 Mechanical fault (permanent).<\/p>\n

Intermittent?<\/strong> \u2192 Timing, power or crop density issue.<\/p>\n<\/div>\n

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Q2 \u2014 Which knotter?<\/div>\n

One side only?<\/strong> \u2192 Fault isolated to that knotter unit.<\/p>\n

Both sides?<\/strong> \u2192 Shared component \u2014 PTO speed, main drive, or twine feed.<\/p>\n<\/div>\n

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Q3 \u2014 Rope end condition<\/div>\n

Loop present on bale?<\/strong> \u2192 Knife did not cut \u2192 Cause 7 or 9.<\/p>\n

No loop at all?<\/strong> \u2192 Needle did not deliver twine \u2192 Cause 8 or threading error.<\/p>\n<\/div>\n

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Q4 \u2014 Twine on the bale?<\/div>\n

Twine wrapped loosely?<\/strong> \u2192 Tension problem \u2192 Cause 4 or 5.<\/p>\n

Twine pulled through?<\/strong> \u2192 Bill hook not holding \u2192 Cause 6.<\/p>\n<\/div>\n

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Q5 \u2014 When does it happen?<\/div>\n

In heavy windrow only?<\/strong> \u2192 Power deficiency \u2192 Cause 11 or 12.<\/p>\n

Regardless of crop?<\/strong> \u2192 Mechanical fault, not load-related.<\/p>\n<\/div>\n<\/div>\n

\n\n\n\n\n\n\n\n\n
Fault Zone<\/th>\nComponents<\/th>\nCauses in This Zone<\/th>\n<\/tr>\n<\/thead>\n
Zone 1 \u2014 Twine Path<\/td>\nGuide eyelets, spool holder, threading route<\/td>\nCauses 1, 2, 3<\/td>\n<\/tr>\n
Zone 2 \u2014 Knotter Mechanism<\/td>\nTension discs, bill hook, knife blade, wiper arm<\/td>\nCauses 4, 5, 6, 7<\/td>\n<\/tr>\n
Zone 3 \u2014 Needle and Cam<\/td>\nNeedle arm, cam lobe, cam follower, timing<\/td>\nCauses 8, 9, 10<\/td>\n<\/tr>\n
Zone 4 \u2014 Power and Crop<\/td>\nPTO speed, tractor load, windrow density<\/td>\nCauses 11, 12<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Zone 1 \u2014 Twine Path Problems (Causes 1\u20133)<\/h2>\n

Zone 1 problems are the easiest to fix and the most frequently overlooked. Always check the twine path first before spending time on the knotter mechanism \u2014 a mis-threaded or worn guide causes symptoms that look identical to knotter faults.<\/p>\n

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1<\/div>\n
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Mis-Threaded Twine Path<\/div>\n
Symptom: consistent miss on one side from the first bale after spool change<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

The twine does not follow the exact path specified in the operator manual. A single wrong guide eyelet produces incorrect tension variation at the knotter entry point \u2014 the loop forms incorrectly or not at all, causing a consistent miss from the moment the new spool is threaded.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Remove all twine from both knotters. Using the threading diagram in the operator manual \u2014 not memory \u2014 re-thread both sides from spool to needle eye. Confirm each guide eyelet is correctly used and the twine does not cross over itself at any point. Run 5 test bales before returning to normal speed.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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2<\/div>\n
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Damaged Guide Eyelets \u2014 Grooves, Burrs and Sharp Edges<\/div>\n
Symptom: twine breaks at a guide point, or twine shows a consistent wear groove at one location<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

Metal guide eyelets wear a groove into their inner surface from seasons of twine running through them at speed. A grooved eyelet catches the twine on each bale cycle, creating friction that disrupts tension uniformity and can cut through the twine after enough repetitions. Burrs from field debris impact cause the same problem.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Run a finger around the inside of every guide eyelet in the twine path. Any groove, rough edge or burr felt by touch will damage twine over repeated cycles. Smooth minor roughness with fine-grit emery cloth. Replace any eyelet with a groove deeper than 0.5mm \u2014 the replacement cost is minimal and the symptom is permanent until the eyelet is changed.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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3<\/div>\n
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Spool Core Collapse or Tangled Feed<\/div>\n
Symptom: intermittent miss; pulling on the twine reveals resistance from the spool holder rather than smooth feed<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

A spool stored in damp conditions can have an inner core that softens and collapses under the weight of the twine above it. As the spool unwinds near the core, the collapsed core creates an irregular feed rate \u2014 the twine feeds in bursts and then goes slack, producing tension variation that the knotter mechanism cannot compensate for.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Remove the spool and check that it rotates freely in the holder with light finger pressure. If the core feels soft or deformed, replace the spool \u2014 do not attempt to continue with a damaged spool. Prevent this issue by storing twine spools in a dry, covered location away from ground contact. Never leave spools loaded on the machine between seasons.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Zone 2 \u2014 Knotter Mechanism Problems (Causes 4\u20137)<\/h2>\n

Zone 2 faults are in the knotter unit itself \u2014 the tension discs, bill hook, knife and wiper arm. These are the most common causes of miss-ties in machines that have been in use for more than one season without a full knotter service.<\/p>\n

\"9YF-2200S<\/p>\n

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4<\/div>\n
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Tension Discs Set Too Loose<\/div>\n
Symptom: large, baggy loop visible around bale; knot forms but slides off the bill before cutting<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

Tension discs control how much resistance the twine meets as it feeds through the knotter. When set too loose, the twine feeds too freely \u2014 the loop that forms around the bill hook is large and slack rather than snug. The bill hook cannot grip a slack loop reliably, and it slips off before the wiper arm strips the knot.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Increase the tension disc spring pressure by one half-turn on the adjustment nut. Test with 5 bales. If the loop is still large, increase by another half-turn and retest. The target loop should be firm and close-fitting around the bill. Both tension discs must be set equally \u2014 unequal tension produces one clean knot and one loose knot per bale cycle.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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5<\/div>\n
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Tension Discs Set Too Tight<\/div>\n
Symptom: twine breaks at or very near the knot; knot forms then the bale pulls free with a snap<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

Over-tightened tension discs place the twine under continuous tension throughout the bale cycle. When the knot tightens around the bale during ejection, the combined tension from the disc and the bale compression load exceeds the knot strength of the twine. This is particularly common when higher bale density settings are used without a corresponding upgrade in twine knot strength rating.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Reduce tension disc pressure by one half-turn. If the twine continues to break at the knot and the discs are already at minimum, the twine strength rating is insufficient for the density setting \u2014 upgrade to a higher-rated twine (minimum 130kg knot strength for high-density bales above 28kg). Do not reduce bale density to match weak twine; change the twine to match the density.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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6<\/div>\n
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Worn, Chipped or Incorrectly Angled Bill Hook<\/div>\n
Symptom: loop slides off the bill; bale ejects with loose twine ends rather than a formed knot<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

The bill hook tip captures the twine loop and holds it while the wiper arm strips the knot. A bill with a worn or chipped tip no longer has the geometry needed to hold the loop securely \u2014 the loop rolls off the bill rather than being held through the stripping action. A bill that is correct in sharpness but misaligned in angle presents the wrong capture surface to the incoming loop.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Remove the bill hook and inspect the tip face. Run a fingernail across the curved tip face \u2014 any flat spot, chip or rounding indicates the bill needs replacement. Check the bill hook angle against the specification in the operator manual using a protractor or the gauge tool if supplied. Replace both bills as a pair whenever one shows wear \u2014 running a new bill against a worn bill produces uneven knots even if both sides appeared to tie during a quick test run.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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7<\/div>\n
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Dull or Worn Knife Blade<\/div>\n
Symptom: a long ragged twine tail on the bale end; the twine is pulled rather than cut, disturbing the knot<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

The knife blade must cut the twine cleanly after the knot is stripped. A dull knife does not cut \u2014 it pulls and saws the twine over several millimetres before it separates. This pulling action applies a sideways force to the finished knot while it is still on the bill, rotating the knot out of position before stripping is complete. The result is a malformed or loose knot that does not hold under bale compression.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Replace both knife blades at the start of every season as routine maintenance \u2014 the cost is low and a sharp blade is the starting point for reliable knotting. Mid-season replacement is needed if ragged tails appear before the season end. After replacement, verify the blade-to-twine-guide clearance is within specification \u2014 a blade positioned too far from the guide cuts at the wrong point in the cycle and produces erratic results even when sharp.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\n\"9YF-2200<\/p>\n

Zone 3 \u2014 Needle and Cam Timing Problems (Causes 8\u201310)<\/h2>\n

Timing problems are the trickiest category because the symptoms are indistinguishable from Zone 2 faults until the mechanism is observed in slow motion. A timing fault means the knotter is mechanically correct but the needle delivers twine at the wrong moment \u2014 outside the capture window of the bill hook.<\/p>\n

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8<\/div>\n
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Needle Path Off-Centre or Bent Needle Arm<\/div>\n
Symptom: no twine at all on one or more bale ends; needle visible but twine not reaching the bill capture zone<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

The needle must travel a precise arc to present the twine at the exact position where the bill hook can capture it. A bent needle arm \u2014 caused by a blockage impact, a stone in the chamber or a plunger strike \u2014 changes the tip position at the capture point by just a few millimetres. This small deviation is enough to cause the bill to miss the presented twine on every cycle.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Cycle the machine slowly by hand (PTO disconnected) and watch the needle tip at its furthest travel point. The tip should align exactly with the bill hook face position per the specification diagram in the operator manual. Any lateral offset indicates a bent arm. Straightening a bent needle arm is not recommended \u2014 the metal is work-hardened and the straightened point is weaker than the original. Replace the needle arm and recheck the tip position against specification before resuming operation.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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9<\/div>\n
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Worn Cam Follower \u2014 Timing Delay at Peak Compression<\/div>\n
Symptom: intermittent misses that increase in frequency as the season progresses; worse in heavy windrows<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

The cam follower arm rides on the cam lobe surface and translates the cam rotation into needle movement. As the follower tip wears, the effective radius at the tip changes \u2014 the follower lifts slightly later on each cam rotation than it should. This timing delay moves the needle delivery point outside the bill hook capture window, producing a miss. The delay worsens as wear progresses, which is why timing faults start as occasional misses and become consistent failures over time.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Remove the cam follower arm and measure the tip radius against the specification in the operator manual using a caliper. Wear beyond the minimum specification requires replacement. Also check the pivot bearing on the follower arm \u2014 a worn pivot bearing introduces lateral movement into the follower tip, which compounds the timing error even if the tip radius is within specification. Replace both together when either is at the wear limit.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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10<\/div>\n
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Cam Lobe Flat Spot \u2014 Worn Peak Geometry<\/div>\n
Symptom: consistent miss on every bale from both sides simultaneously; a flat thud audible at a specific point in the plunger cycle<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

The cam lobe peak is what drives the follower to its maximum travel position, which corresponds to the needle delivering twine at the correct depth into the bill capture zone. A polished flat section on the cam lobe peak means the follower no longer reaches its maximum travel \u2014 the needle stops short of the full delivery position and the bill misses the twine. Cam wear at the peak is accelerated by inadequate lubrication of the cam surface.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

With the PTO completely disengaged and the machine stationary, rotate the main knotter shaft slowly by hand and watch the follower travel. On a good cam, the follower lifts smoothly to a distinct peak then returns smoothly. A flat spot produces a hesitation \u2014 the follower pauses or barely rises at the peak position. Measure the cam lobe height at the peak against the operator manual specification. A worn cam requires replacement \u2014 the cam is a precision-machined part and should not be welded up or shimmed as a field repair.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Zone 4 \u2014 Power and Crop Density Problems (Causes 11\u201312)<\/h2>\n

Zone 4 causes are unique because the knotter mechanism is entirely correct \u2014 the fault lies in the operating conditions. These are the most commonly misdiagnosed causes, because operators who have already checked the knotter without finding any faults do not consider the tractor or the windrow as the source of the problem.<\/p>\n

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11<\/div>\n
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PTO Speed Below 540rpm \u2014 Timing Shifts Across the Full Mechanism<\/div>\n
Symptom: misses correlate with the tractor engine sounding lower or laboured; better tying when forward speed is reduced<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

The knotter timing is calibrated at 540rpm PTO speed. Every cam position, needle travel and bill hook rotation is timed to a specific phase of that rotation speed. When the tractor drops below 540rpm under load \u2014 because the tractor is undersized for the baler or the windrow is particularly dense \u2014 every timing relationship in the mechanism shifts. The needle arrives at a different phase of the bill rotation than designed, and the capture fails.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Monitor tractor engine RPM on the instrument display throughout the baling session. If engine RPM is decreasing during bale cycles \u2014 particularly at the peak compression point \u2014 reduce forward speed until the engine maintains rated RPM without laboring. If the tractor cannot maintain rated speed at any practical forward speed, the tractor is undersized for the baler or the crop conditions. A correctly matched square baler<\/a> should operate at 60\u201380% of tractor PTO rated output in standard conditions, leaving reserve for density peaks.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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12<\/div>\n
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Windrow Density Spikes Exceeding Tractor Reserve at Peak Compression<\/div>\n
Symptom: random misses that occur specifically in the heaviest sections of the field; clean tying in lighter windrow sections<\/div>\n<\/div>\n<\/div>\n
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Causa raiz<\/div>\n

A tractor at 100% of its rated PTO output in an average windrow section has zero reserve for the brief peak compression load when the plunger reaches maximum stroke. In heavy windrow sections \u2014 merged windrows, areas of higher crop yield, or sections where the previous rake pass created a thicker accumulation \u2014 the peak load spikes above the tractor rated output for 0.5\u20131 second. This brief spike drops PTO speed enough to shift knotter timing and produce a miss, even on a tractor that is nominally adequate for the baler model.<\/p>\n<\/div>\n

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Fix Procedure<\/div>\n

Reduce forward speed when approaching visibly heavier windrow sections \u2014 the higher material volume per plunger cycle creates the load spike. Alternatively, improve windrow consistency through raking adjustments that produce a more uniform windrow across the field. The long-term solution for operations where merged windrows are routine is to upgrade to a tractor with 10\u201315HP more PTO output to provide genuine reserve above the rated minimum for the baler model.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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One-Side vs Both-Side Miss: What the Pattern Tells You<\/h2>\n

\"9YF<\/p>\n

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Miss on One Side Only<\/div>\n

A one-side miss isolates the fault to the individual knotter unit on that side. The shared drive system, PTO speed and twine threading are almost certainly not involved \u2014 if they were, both sides would miss simultaneously.<\/p>\n

Check in order:<\/strong> bill hook condition (Cause 6) \u2192 tension disc setting (Causes 4 or 5) \u2192 knife blade (Cause 7) \u2192 needle arm alignment (Cause 8) \u2192 cam follower on that side (Cause 9). One-side misses are almost always resolved in Zone 2 or Zone 3.<\/div>\n<\/div>\n
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Miss on Both Sides Simultaneously<\/div>\n

A both-side simultaneous miss always points to a shared component. The two knotter units do not share mechanical parts \u2014 what they share is: the twine threading path to the spool holders, the PTO drive speed, and the main knotter drive chain.<\/p>\n

Check in order:<\/strong> twine threading on both sides (Cause 1) \u2192 PTO speed (Cause 11) \u2192 windrow density (Cause 12) \u2192 main knotter drive chain tension and condition. Both-side misses that respond to reducing forward speed are always Zone 4 causes.<\/div>\n<\/div>\n<\/div>\n


\n\"square<\/p>\n

The After-Fix Verification Protocol<\/h2>\n

A single test bale after a fix is not sufficient verification. Any knotter adjustment or part replacement requires a structured verification run before returning to normal production speed \u2014 a fix that holds for one bale may fail on the sixth bale at higher density.<\/p>\n

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STEP 1<\/span>Run 5 bales at 60% of normal forward speed. Inspect every tie on both ends of all 5 bales.<\/div>\n
STEP 2<\/span>Pull each rope tie firmly away from the bale end. A correct knot tightens under tension. A loop that slides indicates the bill hook geometry or tension setting is still off.<\/div>\n
STEP 3<\/span>Run 5 more bales at normal forward speed. Inspect all ties again. If all 10 bales tie cleanly, advance to full production.<\/div>\n
STEP 4<\/span>At the first heavy windrow section in the field, observe the tractor engine RPM closely. If RPM drops visibly at peak compression, reduce forward speed and recheck tying in those sections.<\/div>\n
NOTE<\/span>If the miss returns after 20\u201330 bales of normal operation \u2014 rather than immediately \u2014 the fault is likely progressive wear (cam follower, bill hook) rather than a setting error. Progressive wear faults require part replacement, not adjustment.<\/div>\n<\/div>\n

<\/p>\n

When to Stop and Call Technical Support<\/h2>\n

Most miss-tie causes in Zones 1, 2 and 4 are resolvable by an operator with basic mechanical skills and the operator manual. Zone 3 timing faults and cam wear are more complex and can be made worse by incorrect adjustment attempts. Call technical support when:<\/p>\n

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The miss persists after addressing all Zone 1 and Zone 2 causes<\/strong> \u2014 cam or timing fault is the likely cause and requires precise measurement and adjustment.<\/div>\n
The knotter shaft does not rotate smoothly by hand<\/strong> \u2014 a seized bearing or bent shaft requires workshop disassembly, not field adjustment.<\/div>\n
Frame cracks or bent structural components are found during inspection<\/strong> \u2014 structural damage requires professional welding assessment before any further operation.<\/div>\n
A new part has been fitted but the same symptom continues<\/strong> \u2014 the diagnosis may be incorrect and a fresh diagnostic review by a technician avoids additional wasted parts and time.<\/div>\n<\/div>\n

<\/p>\n

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PTO and Driveline Reference for Square Baler Operation<\/h3>\n
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\n\"agricultural
\n<\/a><\/p>\n

Gearbox torque ratings, PTO shaft specifications and input shaft standards for all 9YF models: Especifica\u00e7\u00f5es da caixa de engrenagens agr\u00edcola e do eixo da tomada de for\u00e7a (TDF)<\/a><\/p>\n<\/div>\n

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Zone 4 power-related miss-ties often point to a PTO driveshaft issue \u2014 incorrect shaft length, worn CV joints or a damaged slip clutch that does not transmit consistent torque. Driveshaft specifications and slip clutch ratings for all baler power classes are covered in the Guia de dimensionamento do eixo de transmiss\u00e3o da tomada de for\u00e7a e da junta homocin\u00e9tica<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions \u2014 Square Baler Not Tying<\/h2>\n
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\nMy square baler was tying fine yesterday and this morning it is missing every bale. What changed?+<\/span><\/summary>\n
An overnight change from consistent tying to consistent missing on every bale is almost always caused by one of three things. First, the twine path was disturbed during the session end or a spool change \u2014 check that both sides are still threaded correctly per the diagram. Second, a component that was close to the wear limit failed overnight from thermal contraction in cool conditions (the bill hook tip sometimes reveals edge cracks when inspected in morning light that were not visible during a hot afternoon session). Third, a field debris impact during the last hour of the previous session bent a needle arm or chipped a bill hook without producing enough misses to be noticed at session end. Check Zone 1 threading first, then visually inspect both bill hooks and needle arms for fresh damage marks before starting the engine.<\/div>\n<\/details>\n
\nHow do I know if my tension discs need adjustment or replacement?+<\/span><\/summary>\n
Tension discs that need adjustment show consistent tying quality problems \u2014 loops too large (loose) or twine breaking at the knot (tight) \u2014 but the disc surfaces themselves are smooth and undamaged. Discs that need replacement show visible wear channels, scoring or roughness on the friction faces, or a spring that no longer returns to its starting position after being compressed. A useful test: with the machine stopped and the PTO disengaged, pull the twine through the tension disc zone by hand. It should require moderate, consistent resistance throughout the pull. If the resistance varies \u2014 smooth in one spot, tight in another \u2014 the disc surfaces are uneven and the disc assembly needs replacement. If resistance is consistent but simply too high or too low, adjustment is the correct action.<\/div>\n<\/details>\n
\nCan I continue baling with one knotter missing and fix it later?+<\/span><\/summary>\n
You can continue baling with one knotter not tying only if the failed side consistently produces no tie at all \u2014 the bale exits with two loose rope ends. In this case, the bale is retained in the chamber by the correctly tied side and ejects safely, though it will not hold together during handling. However, if the failed knotter is producing a partial knot or a loop that wraps around the bale incompletely, do not continue \u2014 a partial loop can catch on field obstacles or the bale chute mechanism during ejection and cause a chamber blockage or equipment damage. In either case, a missed knot means the bale has only one rope tie and is significantly weaker for stacking and handling. Plan to re-tie or hand-bind the one-rope bales immediately after the session. Fix the knotter before the next session regardless of how the current session is managed.<\/div>\n<\/details>\n
\nHow often should bill hooks and knife blades be replaced on a square baler?+<\/span><\/summary>\n
Knife blades should be replaced at the start of every season as a routine regardless of condition \u2014 they are inexpensive and starting each season with sharp blades eliminates one variable from the diagnostic process when problems arise. Bill hooks are more durable and may last 2\u20134 seasons in standard hay and straw conditions, but should be inspected carefully at each pre-season service and replaced whenever the tip face shows any rounding, chipping or visible flat spot. In hard-stalk crop conditions (corn stover, sorghum), where debris impact risk is higher, inspect bill hooks after every 100 operating hours during the season. Replace both bill hooks as a pair whenever one needs replacement \u2014 the wear rate difference between a new and a worn bill produces inconsistent knot quality even if both sides appear to be tying correctly during a brief post-service test run.<\/div>\n<\/details>\n
\nWhy does my baler tie well in light windrows but miss in heavy sections?+<\/span><\/summary>\n
Selective missing in heavy windrows while tying cleanly in lighter sections is the classic symptom of Zone 4 \u2014 power-related timing shift. In heavy windrow sections, the plunger compression load at peak stroke is higher, which briefly increases the PTO torque demand. If the tractor is already at or near its PTO output limit, this peak demand causes a temporary reduction in PTO speed. The knotter mechanism is designed to operate at 540rpm \u2014 even a 20\u201330rpm reduction at peak compression is enough to shift the needle delivery timing outside the bill hook capture window, producing a miss. The fix is either reducing forward speed to reduce the material volume per plunger cycle, improving windrow consistency to eliminate extreme density variation, or upgrading to a tractor with more PTO reserve above the baler minimum.<\/div>\n<\/details>\n
\nThe bale ties fine but the rope end is always ragged \u2014 is this a problem?+<\/span><\/summary>\n
A ragged rope end \u2014 frayed rather than cleanly cut \u2014 is an early indicator of knife blade dulling even if the bale is currently retaining its ties. The knife is not cutting the twine cleanly; it is pulling and separating it. As the blade dulls further, the pulling force on the twine during the cutting stroke will begin to disturb the knot before it is fully secured \u2014 producing miss-ties even though the blade still technically separates the twine on each cycle. Ragged ends are a pre-failure indicator: replace the knife blades at the end of the current session rather than waiting for a full miss-tie to develop in the next. Clean, trimmed rope ends that show a distinct cut face indicate a sharp knife in correct position. If your bale ends consistently show clean cuts, knife condition is not contributing to any tying problems you may be experiencing.<\/div>\n<\/details>\n
\nCan poor twine quality cause miss-ties even when the knotter is in good condition?+<\/span><\/summary>\n
Yes \u2014 twine quality directly affects knotting reliability in two ways. First, diameter consistency: premium twine maintains a consistent diameter throughout the spool, which produces consistent tension disc resistance and consistent loop geometry at the bill hook. Economy twine often varies in diameter within a single spool \u2014 thicker sections produce higher tension (risk of breakage) and thinner sections produce lower tension (risk of loose loops). Second, surface texture: rough or degraded twine surfaces catch on guide eyelets and tension discs, creating friction spikes that disrupt the smooth feed required for consistent loop formation. UV-degraded twine \u2014 left on the machine or stored in direct sunlight between seasons \u2014 loses tensile strength at the molecular level, causing failures at the knot during bale ejection even though the knotter mechanism is performing correctly. Always use twine appropriate for your density setting and store unused spools indoors away from UV exposure.<\/div>\n<\/details>\n
\nAfter replacing the bill hooks, the baler still misses. What should I check next?+<\/span><\/summary>\n
If replacing the bill hooks did not resolve the problem, the next checks depend on whether the miss pattern changed after the replacement. If the pattern is unchanged \u2014 same frequency, same side \u2014 the bill hooks were not the primary cause. Move to tension discs (Cause 4 or 5) and knife blades (Cause 7) before advancing to timing causes. If the pattern changed slightly \u2014 less frequent misses, or misses now occurring in different conditions than before \u2014 the bill hooks were a contributing factor but not the only one. Check the cam follower for wear (Cause 9) next, as a worn follower shifts the needle delivery point and produces a miss even with correct new bill hooks. If the miss persists through all Zone 2 checks, cycle the machine by hand at low speed and observe the needle tip position at maximum travel \u2014 a deviation from the specification position in the operator manual confirms a Zone 3 timing fault requiring cam or needle arm attention.<\/div>\n<\/details>\n<\/div>\n

<\/p>\n

Still Not Tying After Checking All 12 Causes?<\/h2>\n
\n

If your 9YF series square baler<\/a> is still missing knots after working through the diagnostic zones above, our technical team can help identify the fault from symptom description and guide you through the fix or arrange service support. Contact us with a description of the miss pattern, which side is affected and what you have already checked.<\/p>\n

Obtenha suporte t\u00e9cnico<\/a>
\nVeja a gama de enfardadeiras quadradas<\/a><\/div>\n

\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Troubleshooting Guide \u00b7 All 9YF Models \u00b7 12 Causes Covered Square Baler Not Tying: 12 Causes and How to Fix Each One A square baler that stops tying \u2014 or ties intermittently \u2014 loses you crop, time and revenue during the narrowest weather window of the season. Every miss-tie has a specific mechanical or operational […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[28],"tags":[],"class_list":["post-1177","post","type-post","status-publish","format-standard","hentry","category-forage-baler"],"_links":{"self":[{"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/posts\/1177","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/comments?post=1177"}],"version-history":[{"count":2,"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/posts\/1177\/revisions"}],"predecessor-version":[{"id":1179,"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/posts\/1177\/revisions\/1179"}],"wp:attachment":[{"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/media?parent=1177"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/categories?post=1177"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/foragebaler.com\/pt\/wp-json\/wp\/v2\/tags?post=1177"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}