Seiko 4R Series User manual

PARTS LIST / TECHNICAL GUIDE
Automatic Cal.4R71A
[SPECIFICATION]
Driving system
Automatic winding with manual winding mechanism
Additional function
・Second hand stop function
Crown
operation
Vibration per hour
21,600 (6 beats per second)
Daily Rate Between +45 and -35 seconds per day
(worn on the wrist at temperature range between 5°C and 35°C)
Loss/Gain
Instantaneous rate at T0 Isochronous fault
（Fully would condition)
Standard rate
Testing positions
Dial upward 6 o'clock at 9 o'clock at Dial upward
for measurement the top the top
Measurement
（Daily rate in ± 20 s/d ± 30 s/d ± 30 s/d ±30 s/d
seconds：s/d）
Regulation system ETACHRON system
Lift angle of the escapement 53°
Power reserve
Continuous operating time From fully wound to stoppage: Approximately 41 hours
Number of Jewels 24 Jewels
1/16
1st click
Time setting / Second hand stop function
Cal. No.
4R71A
Item
Normal position
Manual winding (clockwise only)
・3 Hands (Hour, Minute and Second hands) Movement Size
・Diameter Outside ：φ27.4 mm
Casing ：φ27.0 mm
・
Height
：
5.32 mm

0012 354
Hour wheel guard screw
0376 199
Hour wheel guard
0273 185
Hour wheel
0261 190
Minute wheel and pinion
0225 426
Cannon pinion
2/16
Lower shock
absorbing cap jewel
42-3
Lower hole jewel frame
for shock-absorber
42-2
Cal. 4R71A
42-1
Lower shock
absorbing spring
PARTS LIST
*1
*2
*1
1
2
3
4
5
*2
Type of oil
AO-3(Moebius A) S-6
S-4
Oil quantity mark
NORMAL QUANTITY
SUFFICIENT QUANTITY

1509 199
Oscillating weight with ball bearing
0012 354
Automatic train bridge screw
0012 100
Balance cock screw
0191 183
Automatic train bridge
0514 183
Second reduction wheel and pinion
0171 353
0012 919
Balance cock
Ratchet wheel screw
0285 051
Ratchet wheel
0012 354
Pallet bridge screw
0161 300
Pallet bridge
0310 184
0301 009
Pallet fork
3/16
Upper shock absorbing spring
13-2
Upper shock absorbing
cap jewel
13-3
8
Upper hole jewel frame for
shock-absorber
16
13
10
11
14
9
Balance complete
with stud
17
13-1
15
12
Cal. 4R71A
6
7
PARTS LIST
*1
*1
*2
*3
*3
*2
whole tooth
Type of oil
AO-3(Moebius A) S-6
S-4
Oil quantity mark
NORMAL QUANTITY
SUFFICIENT QUANTITY

23 0511 010
First reduction wheel 0012 100
Refer to page 8 for oiling spot
Refer to page 9 for disassembling/
assembling
Cap jewelled spring
Cap jewel
0831 183
Pawl lever 0363 184
Sliding crown wheel spring
Refer to page 10 for disassembling/
assembling
0114 183
Refer to page 8 for oiling spot
0836 002
Reduction wheel holder 0436 166
0144 185 0012 354
Fourth wheel and pinion
0231 070
Third wheel and pinion
0381 004
Click
0201 083
Barrel complete
4/16
25
Lower plate for barrel and train
wheel bridge
26
24
Lower plate for barrel and train
wheel bridge screw
27
28
29
22
20
PARTS LIST
Barrel and train wheel bridge
with hole jewel frame
21
19
Cal. 4R71A
18
Barrel and train wheel bridge screw
19-1
19-2
*1
*1
Type of oil
AO-3(Moebius A) S-6
S-4
Oil quantity mark
NORMAL QUANTITY
SUFFICIENT QUANTITY

0012 354
Center wheel bridge screw
0122 302
Center wheel bridge
0251 300
Escape wheel and pinion
0224 205
Center wheel and pinion
0012 168
Setting lever jumper screw
0388 177
Setting lever jumper
0384 184
Yoke
0383 186
Setting lever
0601 183
Stop lever
Refer to page 9 for oiling spot
0282 183
Clutch wheel
0283 020
Winding pinion
0351 200
Winding stem
Refer to page 9
Main plate for disassembling
5/16
42
39
41
40
38
Cal. 4R71A
30
31
32
33
34
35
36
37
PARTS LIST
*1
*2 *3
*4
*2
*3
*4
*1
whole tooth
Type of oil
AO-3(Moebius A) S-6
S-4
Oil quantity mark
NORMAL QUANTITY
SUFFICIENT QUANTITY

●LIST OF SCREWS
Automatic train wheel
bridge screw (×2)
●LOCATION OF THE JEWELS
6/16
Total
24 jewels
Entry pallet jewel
○
Exit pallet jewel
○
Roller jewel
○
Second reduction wheel & pinion
○
○
First reduction wheel
○
○
Crown wheel
○
Balance spring
○
○
○
○
Pallet fork
○
○
Barrel complete
○
Escape wheel & pinion
○
○
○
Third wheel & pinion
○
○
○
Forth wheel & pinion
○
Center wheel & pinion
○
○
0012 100
12
Upper
Lower
Hole Jewel
Cap Jewel
Hole Jewel
Cap Jewel
Balance cock
screw
24
Barrel and train
wheel bridge screw
(×3)
PARTS LIST
0012 354
10
Ratchet wheel screw
1
Hour wheel guard
screw (×3)
0012 919
Lower plate for
barrel and train
wheel bridge screw
18
30
Center wheel bridge
screw
15
Pallet bridge screw
(×2)
Parts No
Setting lever jumper
screw
(×2)
7
0012 168
Cal. 4R71A
Name
Name
Parts No
Name
Parts No
34

● Tools and consumables required for disassembling/reassembling
●Movement holder
UNIVERSAL MOVEMENT HOLDER
(S-682)
●Watch oils
SEIKO Watch grease S-6 and S-4. Watch oil AO-3 (or Moebius A)
S-6 AO-3
S-4
7/16
Cal. 4R71A
PARTS LIST

1. Oiling spot
Barrel and train wheel bridge
[Top side]
[Back side]
Note：
After oiling*2, set Lower plate for barrel and train wheel bridge & screw.
Lower plate for barrel and train wheel bridge
Lower plate for barrel and train wheel bridge screw
After oiling*4, set First reduction wheel & Pawl lever & Reduction wheel holder.
First reduction wheel First reduction wheel
Pawl lever
Reduction wheel holder
8/16
Cal. 4R71A
19
25
24
23
23
22
21
TECHNICAL GUIDE
*2
*3
*1 *1
*2 *3
*4
Type of oil
AO-3(Moebius A) S-6
S-4
Oil quantity mark
NORMAL QUANTITY
SUFFICIENT
QUANTITY

Stop lever
Stop lever
Main plate
Contact part of main plate and balance stop lever
2. Disassembling / assembling of the First reduction wheel
First reduction wheel
Reduction wheel holder
Barrel and train wheel bridge (back side)
3. Disassembling of the winding stem
1) Set the winding stem to the normal position
2) Pull out the winding stem, while pushing "A"
Setting lever
Winding stem
9/16
Cal. 4R71A
38
37
39
<< Disassembling >>
<< Assembling >>
23
21
19
TECHNICAL GUIDE
A

4. Disassembling / assembling of the Sliding crown wheel spring
Sliding crown wheel spring
Barrel and train wheel bridge with hole jewel frame
5. Setting position of Oscillating weight
When fixing the Oscillating weight, an alignment with the First reduction wheel is necessary
in order to wind the Mainspring most efficiently. Rotate the First reduction wheel manually until
its hole aligns with the gilt dot on the Balance cock and set the Oscillating weight vertically at
the stem side, and then tighten the screw. Refer to the figure below.
Balance cock guide pin First reduction wheel gear
10/16
20
19
<< Disassembling >>
<< Assembling >>
Set the part to the Barrel and train wheel bridge and
push the hook from the top with tweezers so that it will
be engaged securely.
Remove the hook of the Sliding crown wheel spring
from the Barrel and train wheel bridge with hole jewel
frame.
Cal. 4R71A
TECHNICAL GUIDE
PUSH
Enlarged
view

6. Accuracy adjustment
Regulator
Regulator pin
Stud support
Note:
・Regulator … Time adjustment
・Stud support … Beat error adjustment
・Regulator pin … Gap adjustment of Balance spring and Regulator pin
11/16
Cal. 4R71A
Counterclockwise rotation
No clockwise rotation
TECHNICAL GUIDE
(+) side
(-) side

●How to remove and install the Balance complete with stud
How to remove How to install
1. Initial phase 1. Initial phase
Move the stud support toward the arrow marked Set a new balance complete with stud to the
direction until it touches the balance cock. main plate.
2. Make sure that the outer coil is not removed from
2. Set the Balance cock and tighten the balance
the regulator arm. cock screw.
3. Using sturdy tweezers, push the stud outward 3. Temporarily set the stud to the stud support.
from the direction of the arrow shown in the
Make sure that the balance spring passes outside
illustration until it is removed from the stud support. the regulator pin.
* Be careful not to damage the balance spring.
4. Using sturdy tweezers, set the stud to the stud
support and press it down.
Make sure that the outer coil passes through
the regulator pin slot.
* Be careful not to damage the balance spring.
4. Unscrew the Balance cock screw and remove the
Balance cock.
12/16
Cal.4R71A
TECHNICAL GUIDE

●How to regulate the isochronous fault by adjusting the position of the balance-spring
This caliber has the Etachron system for fine regulation of the isochronous fault.
The watch shows a gain trend as amplitude decreases and loses time badly near the end of its useful power reserve.
The isochronous fault can be adjusted easily by turning the Regulator pin to make the gap in the slot
either larger or smaller.
1) Make sure that the Regulator pin is aligned in a vertical position to the Regulator and the
balance-spring passes parallel through the slot of the Regulator pin before fine-tuning the STUD
and the Regulator pin.
REGULATOR PIN
2) Rotate the STUD in order to align the position of the balance-spring passes through the center of
the slot of the Regulator pin.
3) Rotate the REGULATOR PIN counterclockwise in order to fine-tune the clearance of
the balance-spring passing through the slot of it. Set it to moderate gap to get the stable trend.
REGULATOR PIN
Top side view
Back side view
TECHNICAL GUIDE
Cal.4R71A
(Maximum clearance)
(Minimum clearance)
13/16
Top side view
Back side view
Before rotating
After rotating
Before rotating
After rotating
Top side view
Back side view
Angled view
STUD
REGULATOR PIN

【4R71A Operation Manual】
1. How to set the time
1) Pull out the crown to the first click when the secondhand is at the 12 o’clock position.
(The secondhand stops on the spot.)
2) Turn the crown to set the hour and minute handsto the correct time.
* Do not set the date between 9:00 p.m. and 4:00 a.m. If you do,
the datemay not change properly / it may cause a malfunction.
3) Push the crown back in to the normal position inaccordance with a time signal.
2. How to wind up the mainspring
a) Manual winding … Slowly turn the crown clockwise at normal position.
* If you wind by turning the ratchet wheel screw 8 times, it will start to move naturally after shaking slightly.
b) Winding up with the winding machine.
Full wind up conditions are as follows:
・Rotary speed : 30 rpm
・Operating time : 60 minutes
14/16
Cal. 4R71A
OPERATION MANUAL

TECHNICAL GUIDE Cal. 4R71A
●Water resistance test
Check the water resistance according to the designated specification of the watch
Marking on the case back Test method Applied pressure
WATER RESISTANT(WATER RESIST) 3 BAR
WATER RESIST 5BAR 5 BAR
WATER RESIST 10BAR 10 BAR
WATER RESIST 15BAR 15 BAR
WATER RESIST 20BAR 20 BAR
SCUBA DIVERIS （AIR DIVERIS）150 m 18.75 BAR ＝150(m)times 0.125
SCUBA DIVERIS (AIR DIVERIS)200 m
25 BAR ＝200(m)times 0.125
He-GAS DIVERIS 300 m
37.5 BAR ＝300(m)times 0.125
He-GAS DIVERIS 600 m
75 BAR ＝600(m)times 0.125
He-GAS DIVERIS1000m
125 BAR ＝1000(m)times 0.125
15/16
Air leak test
Water pressure test
Condensation test
Condensation test
Condensation test
Water pressure test

TECHNICAL GUIDE
Cal. 4R71A
●Accuracy test
Measure the rate in three different positions within 30 minutes after the watch is fully wound up (wait
approximately for 5 minutes after winding up in order to get a stable oscillation of the balance) and
make sure the value shows within the range in the table below.
Measure the rate in dial-up position after 24 hours from fully wound up (T24) and check the rate
difference with the rate in dial-up position when it is fully wound up (T0). Make sure that the value of
T24-T0 shows within the range of the isochronism in the table below.
Instantaneous rate at T0 Isochronous fault
（Fully would condition)
Testing positions
Dial upward 6 o'clock 9 o'clock Dial upward
at the top at the top
Measurement
(Daily rate in
± 20 s/d ± 30 s/d ± 30 s/d ±30 s/d
seconds：s/d）
● Accuracy of Mechanical Wataches
✤
The accuracy of mechanical watches is indicated by the daily rates of one week or so.
✤
✤
✤
✤When affected by external strong magnetism, a mechanical watch may loss/gain time temporarily.
● Duration time test
Check the Power reserve of the watch after the mainspring is fully wound up and leave it oon natural
10/16
condition with the dial-up position. Make sure that the watch runs approximately 41 hours until it stops.
16/16
The parts of the watch may become magnetized depending on the extent of the effect. In such a case,
consult the retailer from whom the watch was purchased since the watch requires repair, including
demagnetizing.
Standard rate
for measurement
The accuracy of mechanical watches may not fall within the specified range of time accuracy because
of loss/gain changes due to the conditions of use, such as the length of time during which the watch is
worn on the wrist, arm movement, whether the mainspring is wound up fully or not, etc.
The key components in mechanical watches are made of metals which expand or contract depending
on temperatures due to metal properties. This exerts an effect on the accuracy of the watches.
Mechanical watches tend to lose time at high temperatures while they tend to gain time at low
temperatures.
In order to improve accuracy, it is important to regularly supply energy to the balance that controlsthe
speed of the gears. The driving force of the mainspring that powers mechanical watches varies
between when it is fully wound and immediately before it is unwound. As the mainspring unwinds, the
force weakens.
Relatively steady accuracy can be obtained by wearing the watch on the wrist frequently for the
selfwinding type and winding up the mainspring fully everyday at a fixed time to move it regularly for the
wind-up mechanical type.