Disassembly of Yanmar Starter Motor (4TNV94L 98, 4TNV106(T))

For Yanmar diesel engines used in agricultural equipment, excavators, tractors, marine generators, and diagnostic tools.

(1) Disassembly Order

1. Nut M8 (Disconnect the connecting cable)
2. Screw M4 (2)
3. Through bolt M5 (2)
4. Rear cover
5. Brush holder
6. Yoke clip
7. Return spring
8. Pinion shaft
9. Clutch assembly

(2) Disassembly Procedure

1. Nut M8
   • Remove the nut M8 (12mm) from the magnet switch and disconnect the connection cable.
     
2. M4 Screws (2)
   • Remove the two M4 screws.
     
3. M5 Through Screws (2)
   • Remove the two M5 through screws.
     
4. Rear Cover
   • Remove the M4 screws securing the brush holder to the rear cover.
   • Remove the through screws M5 and then remove the rear cover.
5. Brush Holder
   • Use a brush spring puller to pull the brush springs upwards.
   • Touch the negative (-) side brush spring to the side of the brush and release it from the brush.
   • On the positive (+) side, pull the brush out of the brush holder.
     
6. Yoke Assembly
   • Remove the yoke clip and then remove the yoke assembly.
     
7. Anchor
   • Remove the brush holder.
   • Remove the anchor and yoke assembly.
     
8. M6 Screws (2)
   • Remove the M6 screws (10mm) to remove the magnetic switch.
     
9. Magnetic Switch
   • Remove the magnetic switch.
     
10. Dust Cap
    • Remove the dust cap from the gearbox housing.
11. Shift Lever
    • Remove the gear lever.
12. M4 Screws (3)
    • Remove the three M4 screws.
13. Bearing Holder
    • Remove the bearing holder.
14. Gear Case
    • Remove the M4 screws to remove the bearing holder and clutch assembly.
15. Pinion Stopper Clip
    • Remove the bearing holder and bearing at the end.
    • Slide the pinion stopper inwards.
    • Use a screwdriver to pry off the pinion stopper clip.
16. Pinion Stopper
    • Remove the pinion stopper.
17. Return Spring
    • Remove the return spring.
18. Pinion Shaft
    • Remove the pinion shaft.
19. Clutch Assembly
    • Remove the sprocket stopper clip.
    • Remove the pinion stopper, return spring, pinion shaft, and bearing holder.

YANMAR Diagnostic Service Tool (YEDST) Yanmar Agriculture Construction Tractor Diagnostic Tool

Disassembly is now complete.