Why the wind feels heavy, the frame counter misbehaves or T will not release. Component reference, mechanism and troubleshooting
The take-up middle plate is the small plate under the Nikon F2's wind lever that carries three things you use on every frame: the wind lever's one-way drive, the frame counter, and the shutter release with its T and L collar. Nikon calls it subassembly D-3, and built all three onto one plate so their relationships are fixed.
Typical symptoms are a wind lever that feels stiff, slips or is slow to return; a frame counter that skips, stops between numbers or will not reset to S when the back is opened; and, on T, a shutter button that stays down after winding.
A heavy wind is not always this plate. Nikon names causes elsewhere in the transport as well, and the plate's own mounting position affects how heavy the wind feels. Symptoms & troubleshooting, below, separates them.
Not an owner adjustment. The plate sits under the top cover, its position is itself an adjustment, and the counter spring is held under tension, so it is a bench job. This note explains what is happening and what to look for; it is not a service procedure.
The take-up middle plate is a matchbox-sized carrier holding three systems that live under the right-hand top cover and run off the same wind cycle: the wind input (lever to one-way drum), the frame counter with its reset, and the shutter release with its T-L collar. Nikon built them onto one plate so the relationships between them are fixed and the unit can be assembled and checked off the body. D-3 comprises 54 component pieces: 32 fitted direct to the plate (including five 811 screws and two 434 nuts) and 22 in six nested subassemblies (D1, D2-1, D3, D4-2, D5, D6-2). The release mount screw 887 is shown in Fig. 4 but is not part of D-3 and is not counted.
What a Public Bench Note is for. It explains what each part does, how the mechanism works, what a fault points to, what Nikon specifies and what Speybench has observed. It should answer more questions than it raises, but it is not a service procedure: strip-down and reassembly sequences, tooling and the full Speybench workshop process sit outside it. Every technical claim carries its provenance, so the reader can see what is Nikon's, what is read from Nikon's drawings, and what is Speybench's own.
In the component tables every part number, name, subassembly and quantity is Nikon's, and each row describes the part as the manual documents it. In the fault table the mark rates the link between symptom and mechanism. Grey JP lines are Speybench translations of the Japanese names printed beside the English in the parts list. Text after Bench note is Speybench practice and is not covered by its row's mark. Part numbers in the fault table link to their component rows.
Wind input. The lever stroke goes down the lever shaft into a one-way drum whose ratchet claws drive the transport and cocking train below the plate on the wind stroke and slip on the return. A spring returns the lever; a stopper sets where it comes to rest.
Frame counter. The counter is not driven from the lever shaft. Its drive comes up from the sprocket shaft: cross pin 1007-1 turns coupling ring 255-2, which turns eccentric 256-2, which reciprocates the advance claw once per sprocket revolution (Fig. 12). The sprocket is gear-driven from the wind, so the count follows the wind with or without film. A lock claw holds each step against the return spring, and opening the back lifts both claws so the spring drives the dial to S.
Shutter release. The button and its shaft carry the release down into the body. The T-L collar selects time or lock. At T the button stays down until the camera is wound (Nikon's functional check); the T release pin on the drum and the time release lever are the parts named for that release.
Drive chain (traced from Fig. 12 and the parts list)
Sprocket shaft 251-3, cross pin 1007-1
↓ coupling ring 255-2, below the plate
↓ eccentric 256-2, above the plate
↓ advance claw 210-1, one stroke per revolution
↓ ratchet 208-1 steps one tooth
↓ lock claw 211 holds; dial 206 reads
Consequence for diagnosis
256-2 sets the timing of the step within the wind, not where the dial comes to rest.
Dial sits between numbers: rest-position fault. Dial indexed wrongly on 208-1, lock claw 211 not seating (945), or index plate 212.
Count steps early, late or not at all: drive fault. 255-2 on 1007-1, 256-2, or 210-1.
By what can be observed on the assembled camera. Each entry points to the part of the mechanism worth examining; it is not a repair procedure. Where the correction is not yet established on the bench, the entry says so. The mark rates how firmly the symptom is tied to the mechanism.
Plate position. Nikon (Assembling point 1, PDF p.35): release the four attaching screws once, and fasten them in a position where winding is not heavy and the lever returns correctly. Incorrect plate positioning can produce a heavy wind even when the mechanism itself is clean. Speybench practice: snug the screws, cycle the lever, find the position, then tighten and log it on the bench record.
T release. Nikon (Sect. 10 (iii) 3 and 4, PDF p.31): two pass/fail checks. At T the shutter releases with the button staying depressed, and the button (259) returns to its original position when the lever is wound. No trip point is given. Speybench practice: record the lever angle from rest, in degrees, at which the button lifts, as a comparison baseline across bodies. It is not a Nikon tolerance.
Counter. Speybench practice: before undoing nut 204, record the dial position against the index, then the number of turns and the direction of 209-1 preload as it unwinds, viewed from above. After reassembly the counter should step one number per full wind, hold each position, and return to S when the reverse lever (291) is operated by hand. Too little preload and the dial stalls short of S; the turns recorded on strip-down are the reassembly figure.
The manual's lubricant list (PDF pp.5 to 6) catalogues Nikon's internal lubricant codes but gives no lubrication map for D-3, and Fig. 4 carries no lubrication marks. What follows is Speybench workshop practice and is not presented as Nikon's specification. Working rule: pivots and axles (763, 218, 799-1, 879, the claw pivots) get a single drop of light pivot oil from a watchmaker's oiler (Nyoil II on this bench); metal-to-metal sliding surfaces (drum interior, lever shaft) get a thin film of light synthetic grease. The lock claw axle 218 and the eccentric 256-2 running in the bore of 210-1 take a trace of oil only. Ratchet teeth, claw tips and the counter springs stay dry. Keep oil to a minimum above the release shaft and around the counter; oil migrates.
One per body. Fill in on strip-down and again on reassembly.
| Item | Recorded |
|---|---|
| Body serial | F2 serial and finder fitted |
| Dial at strip-down | Number against index 212 |
| 209-1 preload | Turns, and CW or CCW viewed from above |
| Plate position | Witness marks or screw positions within float |
| Wind feel | Light / heavy; lever return clean / slow |
| T trip angle | Lever degrees from rest at which 259 lifts |
| Counter function | Steps per wind; holds; returns to S |
The fill-in sheet, with strip-down and reassembly columns, is in the PDF edition.
Each part as Nikon documents it: number, name, subassembly and quantity from the parts list, with the Japanese name where it says more than the English. Every row is N. Where a part's working relationship is still open, it is listed once under Open items rather than repeated row by row.
The carrier for the wind input, frame counter and release. Its mounting position is itself an adjustment.
| Part | Name | Sub | Qty | Function and why | Mark |
|---|---|---|---|---|---|
| 265-1 | Take-up middle plate | D-3 | 1 | Mounts the wind input, frame counter and release as one unit so their relationships are fixed and it can be built and checked off the body. Nikon: release the four attaching screws once and fasten them where winding is not heavy and the lever returns correctly (Assembling point 1, PDF p.35). Fig. 12 flags the plate with the same marker. | N |
Lever stroke in, one-way drive out to the transport and cocking train below the plate.
| Part | Name | Sub | Qty | Function and why | Mark |
|---|---|---|---|---|---|
| 213-1 | Take-up lever shaft JP: wind lever shaft | D-3 | 1 | Carries the lever stroke down through the plate into the drum. Its upper end also locates the frame counter stack (Fig. 12). | N |
| 214-1 | Take-up barrel drum | D4-2 | 1 | Body of the one-way clutch. Turns with the lever and carries the ratchet claws that drive the take-up ratchet (215, subassembly A9) below the plate (Fig. 12). | N |
| 217 | Ratchet claw | D4-2 | 2 | Engage on the wind stroke and slip on the return, so the lever comes back without unwinding anything. This is also what permits winding in several short strokes. | N |
| 763 | Ratchet axle JP: ratchet claw axle | D4-2 | 2 | Pivots for the two ratchet claws. | N |
| 937 | Ratchet claw spring (d=0.28) | D4-2 | 1 | Holds the claws into engagement. Bench note: a tired spring gives a wind that slips or feels vague under load. | N |
| 815 | Ratchet claw spring holder JP: ratchet claw spring screw | D4-2 | 1 | A screw, per the Japanese name, anchoring the ratchet claw spring. | N |
| 289-2 | T release pin | D4-2 | 1 | Pin on the take-up drum named for the T (time) release; works with time release lever 325. Nikon's check: at T the button returns when the camera is wound (Sect. 10 (iii) 4, PDF p.31). | N |
| 429 | Take-up spring JP: wind lever mainspring | D-3 | 1 | Returns the lever to rest after every stroke. Bench note: weak return points here, at a gummed drum, or at a plate fixed in a poor position. | N |
| 813 | Screw ⊖2R-3(S) JP: take-up barrel fixing screw | D-3 | 1 | Secures the take-up barrel drum. | N |
| 277 | Take-up lever stopper JP: wind lever return-limit spring | D5 | 1 | Limits the lever's return travel so it stops at a consistent rest position instead of striking the body. | N |
| 312 | Stopper pin JP: limit spring stopper pin | D5 | 1 | Anchor pin for the lever stopper spring. | N |
| 835 | Stopper spring holder JP: limit spring fixing screw | D-3 | 1 | A screw, per the Japanese name, fixing the limit spring (277). | N |
| 434 | Nut JP: limit spring fixing nut | D-3 | 2 | Retain the limit spring fixing. Two off: parts list quantity 2 and two callouts in Fig. 4, although the D-3 constituent list writes 434 once (PDF pp.76, 121). | N |
Counts sprocket revolutions, one tooth per frame. The dial is always held against its own return spring.
| Part | Name | Sub | Qty | Function and why | Mark |
|---|---|---|---|---|---|
| 204 | Frame counter nut | D-3 | 1 | Retains the counter stack on its bearing. Bench note: undoing it releases the 209-1 preload; record first (see Counter, below). | N |
| 206 | Frame counter dial | D-3 | 1 | The printed S, 0 to 40 scale. Bench note: keep out of solvent and ultrasonic; clean dry. | N |
| 208-1 | Frame counter ratchet | D-3 | 1 | Toothed wheel under the dial. Stepped one tooth per frame by the advance claw. | N |
| 209-1 | Frame counter spring JP: frame counter return mainspring | D-3 | 1 | Constantly pulls the dial back towards S. Its preload is what resets the counter when the back opens. The manual gives neither turns nor direction of preload. | N |
| 205 | Frame counter bearing | D-3 | 1 | Bearing for the counter stack, mounted under the plate. | N |
| 811 | Screw ⊕1.4Q-2(1) JP: counter bearing fixing screw | D-3 | 5 | Secure the frame counter bearing. | N |
| 255-2 | Frame counter coupling ring JP: frame counter linkage ring | D-3 | 1 | Sits on the top of the sprocket shaft and is turned by its cross pin 1007-1; transmits sprocket rotation up through the plate to 256-2 (Fig. 12). | N |
| 256-2 | Frame counter eccentric | D-3 | 1 | Drive eccentric on the sprocket axis, above the plate. Fig. 4 draws the advance claw's large bore on this axis: one sprocket revolution swings 210-1 through one feed stroke. A drive cam, not a rest-position adjuster. | N |
| 210-1 | Take-up claw D2-1 list: Advance claw | JP: feed claw | D2-1 | 1 | Rides on eccentric 256-2 and steps the counter ratchet one tooth per sprocket revolution. | N |
| 211 | Lock claw | D3 | 1 | Holds the ratchet after each step so the dial cannot slip back against 209-1. Bench note: its seating in the tooth sets where the dial rests; a dial between numbers points here first. | N |
| 218 | Frame counter retainer JP: frame counter stop-claw axle | D-3 | 1 | Pivot axle for the lock claw (211), per the Japanese name. Not the advance claw's pivot: 210-1 is carried on 256-2. | N |
| 762 | Spring holder | D2-1, D3 | 2 | Anchors for the claw springs, one in each claw subassembly. | N |
| 945 | Frame counter spring (d=0.35) | D-3 | 1 | Wire spring acting on the frame counter claws. Bench note: missed or doubled counts point here. | N |
| 212 | Frame index plate | D-3 | 1 | Carries the index the dial numbers read against. | N |
| 842 | Screw ⊖1.4R-1.4(S) JP: leaf spring screw | D-3 | 1 | Fixing for a leaf spring on the counter side of the plate. | N |
Opening the back releases the claws and the return spring drives the dial to S.
| Part | Name | Sub | Qty | Function and why | Mark |
|---|---|---|---|---|---|
| 291 | Counter reverse lever JP: zero-return lever | D1 | 1 | Moved by the back-opening linkage; lifts the advance and lock claws clear so spring 209-1 returns the dial to S. | N |
| 287 | Frame counter lever pin JP: zero-return lever pin | D1 | 1 | Pin on the reverse lever that acts on the claws. | N |
| 799-1 | Frame counter lever axle JP: zero-return lever axle | D-3 | 1 | Pivot for the counter reverse lever. | N |
| 931 | Counter reverse lever spring (d=0.6) | D-3 | 1 | Spring for counter reverse lever 291. | N |
| 1015 | Collar (2.5x1.5x3.2) JP: zero-return lever collar | D-3 | 1 | Spacer collar setting the reverse lever's height on its axle. | N |
The release button, its cable release thread, and the T (time) and L (lock) collar.
| Part | Name | Sub | Qty | Function and why | Mark |
|---|---|---|---|---|---|
| 259 | Shutter release button | D6-2 | 1 | The release button itself. | N |
| 260-1 | Shutter release shaft | D6-2 | 1 | Transmits the button travel down into the body release linkage. | N |
| 949 | Shutter button spring (d=0.23) | D6-2 | 1 | Returns the release button. | N |
| 797 | Shutter button spring holder | D-3 | 1 | Seats the button spring. | N |
| 262-2 | Release screw mount JP: release screw | D6-2 | 1 | Threaded boss for the cable release; houses the release shaft. | N |
| 887 | Screw ⊕1.4Q-3(1) JP: release screw fixing screw, long | none | 1 | Secures the release screw mount. Shown in Fig. 4 but in no subassembly, and the parts list gives it no figure reference (PDF p.101). | N |
| 261-1 | T-L coupling ring JP: T-L rotating ring | D6-2 | 1 | The collar under the release button that selects T (time) or L (lock). | N |
| 263 | T-L ring click pin | D-3 | 1 | Gives the T-L collar its detent positions. | N |
| 266 | T-L spring | D-3 | 1 | Loads the click pin into the detents. | N |
| 435 | T-L connecting pin | D-3 | 1 | Links the T-L ring to its internal action. | N |
| 264 | Snap ring | D6-2 | 1 | Retains the release assembly. | N |
| 325 | Time release lever | D-3 | 1 | Time release lever, pivoting on axle 879; part of the T release with pin 289-2. | N |
| 879 | T release lever axle | D-3 | 1 | Pivot for the time release lever. | N |
| 289-2 / 325 | Establish whether the T release pin trips the time release lever on the forward stroke or the return, and at what lever angle. Record against the worksheet. |
| 256-2 | The notches on the eccentric's rim (Fig. 4) suggest it keys to 255-2. Establish whether it can be fitted in more than one position, and if so whether that shifts the counter's step within the wind. Do not treat it as a rest-position adjuster until shown otherwise. |
| 945, 931 | Confirm each spring's anchor points against Figs. 12 to 15 with the plate on the bench. |
| 866 | Fig. 4 labels a screw 866 near the stopper group, but the parts list assigns 866 to C-1 and C3-1 (Figs. 2 and 17) and the D-3 list does not include it. 834 is struck from the D-3 list. Identify what is actually fitted at that position. |
These points remain open for physical verification. As they are established on the bench, this note will be revised and the revision history will record what changed.
No diagram is published until it has been checked against a physical D-3 assembly. A drawing carries more authority than its caveats, and a spring route, lever contact or direction of rotation drawn slightly wrong would be trusted over the text. Each will be produced from the mechanism itself: physical assembly, controlled photographs, component geometry traced from them, a reconstructed illustration, then verification against the assembly in operation.
Diagram 1: wind and take-up
Parts: 213-1 shaft, 214-1 drum, 217 claws, 763 axles, 937 spring, 289-2 T release pin, 429 lever spring, 277 stopper.
To show: direction of lever travel; direction of drum and take-up ratchet; claw engagement on the wind stroke and slip on the return, as numbered strokes; where 289-2 meets 325.
Diagram 2: frame counter and reset
Parts: 256-2 eccentric, 210-1 advance claw, 211 lock claw on 218, 208-1 ratchet, 209-1 return spring, 945 claw spring, 291 reverse lever, 287 pin.
To show: the eccentric's throw per sprocket revolution; direction of ratchet rotation and which way each claw hooks; lock claw seating; the back-opening reset with both claws lifted.
Each will carry the caption Speybench mechanism illustration, traced from a photographed D-3 assembly and verified against it. Not a Nikon factory drawing.
| Source | Manual reference | PDF page | Printed page |
|---|---|---|---|
| Exploded view | Fig. 4 | p.13 | 11 |
| Sectional view, spool and sprocket | Fig. 12 | p.21 | 19 |
| Accuracy adjustments, T check | Sect. 10 (iii) 3 to 4 | p.31 | 29 |
| Assembling points | Sect. 11, Nos. 1, 3, 4, 10 | p.35 | 33 |
| Parts list (D-3 parts throughout) | In part-number order | pp.55 to 116 | 15 to 76 |
| Subassembly list | D-3, D1 to D6-2 | pp.120 to 121 | 80 to 81 |
The manual's printed folios differ from the PDF page count; both are given. Page references in the text are PDF pages.
| Rev | Date | Change |
|---|---|---|
| A | Oct 2026 | First issue. |
| B | Oct 2026 | Intermediate revision, superseded before issue. Not distributed. Its corrections are carried into Rev C, which is the reference to use. |
| C | Oct 2026 | Changes from Rev A. Rechecked line by line against Figs. 4 and 12, the parts list and the subassembly list. Counter drive traced to the sprocket shaft: 255-2, 256-2 and 210-1 rewritten, 256-2 now a drive eccentric rather than a rest-position adjuster. 434 quantity corrected to 2; count stated as 54 component pieces. 949 moved to D6-2; 887 recorded as outside D-3 with no figure reference. Names given as the parts list prints them, with the Japanese names translated: 218 confirmed as the lock claw axle, 210-1 listed as Take-up claw, 815 and 835 identified as screws. Provenance marks N, D, I and S replace C and I; workshop observations in rows prefixed Bench note; oil points moved to the lubrication section. Procedures and lubrication marked as Speybench practice. Bench record sheet, open items for 256-2 keying and the 866 discrepancy added. Mechanism diagrams reserved for hand sketches from a physical assembly. |
| D | Oct 2026 | Issued as Public Bench Note F2-001, the first in the series. Added Symptoms & troubleshooting: eleven symptoms linked to mechanism and component, each marked for evidence, with corrections given only where Nikon states them and the rest marked Verify on bench. Heavy-wind causes outside D-3 cited from Assembling points 3, 4 and 10. Added a statement of what a Public Bench Note covers, a How the module works section, and links from fault entries to component rows. Sources moved to the end. Mechanism illustration method revised to traced geometry from photographed components; diagrams remain unpublished until verified. Added the B mark for bench-verified observations, so verified findings no longer have to be described as promotions to N or D. Published alongside an HTML edition at speybench.com/bench-notes/f2-001. Component descriptions, piece count and existing marks carried over from Rev C unchanged. |
| E | Oct 2026 | Brought to the F2-002 standard. Retitled in the terms owners search for, with an In brief summary for owners first and the diagnostic sections ahead of the component reference. Symptoms renamed as an owner would describe them. Every component row is now N, describing the part as the manual documents it; the four inferred rows (289-2, 325, 931, 945) rewritten as descriptions, their open questions kept under Open items. Corrections address added. Part data and counts unchanged from Rev D. |