Poljot 3133
I've been going through Mark Lovick's level 5 course on chronographs, and one of the demonstration movements is the Poljot 3133. I picked up a specimen, a "Poljot", to follow along. The watch arrived in running condition, and all chronograph functions worked.
| Position | Rate [spd] | Amplitude [°] | Beat error [ms] | Note |
|---|---|---|---|---|
| DU | ||||
| DD | ||||
| CL | ||||
| CD |
Disassembly and fault finding
Despite being hands down the most complex movement I've worked on (chronograph+calendar), disassembly was uneventful.
I did have the misfortune of clamping the movement in my movement holder crooked. This put pressure on the minute runner stem which gave it a slight bend. Luckily, there's no fouling, so I won't try to straighten it.
I don't have the fancy Bergeon tool to remove 3-spoked chronograph wheels, so I fashioned a tool out of scalpel blades. They were able to lever off the wheel without risking damage to the fourth wheel pivot.
Component overview
Reassembly
Notes from Watchfix C5.3.
Base movement reassembly
- lubricate lower barrel arbor bearing (D5)
- install into barrel
- lubricate upper barrel arbor bearing
- fit barrel lid
- install barrel onto main plate
- install fourth wheel
- install small plate for third wheel (!)
- fit third wheel and centre wheel
- fit barrel bridge
- fit escape wheel
- fit trail wheel bridge
- D5 for barrel arbor, center wheel and third wheel
- 9010 for fourth wheel and escape wheel
- D5 on crown wheel sleeve (!)
- Ratchet wheel and click spring (note: my ST1901 is slightly different to Mark's). D5 on click spring post, 9510 on spring where it touches the click piece.
- place chronograph runner wheel's friction spring above center wheel
- Small qty. of 9010 where the chrono runner wheel interfaces with the friction spring
- 9010 on chrono runner wheel's extended pivot and insert it
- minute recording runner is fitted DRY
- fit the chrono runner wheels' cock