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Lower Unit [Forward Gear And Drive Shaft] [1998]

Applicable Models

Model GroupYearModelSerial
Yamaha International199825hpAll
Yamaha Outboard199825hpAll
Lower Unit [Forward Gear And Drive Shaft] [1998]
Yamaha Marine

EXPLODED DIAGRAM

REMOVAL AND INSTALLATION CHARTCHART

Step Procedure/Part name Q'ty Service points
FORWARD GEAR AND DRIVE
SHAFT REMOVAL
Propeller shaft assy.
Follow the left "Step" for removal.
1 Pinion gear 1
2 Drive shaft 1
3 Forward gear
(with the tapered roller bearing)
1
4 Drive shaft bearing outer race 2
5 Pinion gear shim 1 set
6 Drive shaft sleeve 1
7 Drive shaft bearing 1

EXPLODED DIAGRAM

REMOVAL AND INSTALLATION CHART

Step Procedure/Part name Q'ty Service points
8 Needle bearing 1
9 Tapered roller bearing outer race 1
10 Forward gear shim 1 set
Reverse the removal steps for installation.

SERVICE POINTS

Forward and reverse gear disassembly

  1. Remove:

    • Pinion gear nut

  Drive shaft holder:   YB-06079-A/90890-06517

  Pinion nut holder:   YB-06078/90890-06505**

  1. Remove:

    • Pinion gear

    • Forward gear
      (with the tapered roller bearing)

  1. Remove:

    • Drive shaft bearing outer race

    • Pinion gearshim(s)

    Slide hammer set (1):   YB-06096

    Stopper guide plate (2):   90890-06501

    Bearing puller (3):   90890-06535

    Stopper guide stand (4):   90890-06538

    [A] For USA and CANADA

    [B] Except for USA and CANADA

Forward gear disassembly

  1. Disassemble:

    • Forward gear
      (from the tapered roller bearing)

    Bearing separator:   YB-06219/90890-06534

Drive shaft disassembly

  1. Remove:

    • Drive shaft bearing

    Bearing separator (1):   YB-06219/90890-06534

    Bearing inner race installer (2):   90890-06643

    [A] For USA and CANADA

    [B] Except for USA and CANADA

Lower case disassembly

  1. Remove:

    • Needle bearing

    Driver rod (1):   YB-06229/90890-06602

    Needle bearing attachment (2): YB-06082/90890-06615

  1. Remove:

    • Tapered roller bearing outer race

    • Forward gear shim(s)

    Slide hammer set:   YB-06096

    Slide hammer handle:   90890-06531

    Bearing outer race puller:   90890-06523

    [A] For USA and CANADA

    [B] Except for USA and CANADA

Forward gear assembly

  1. Install:

    • Tapered roller bearing (to the forward gear)

    Driver rod:   YB-06071/90890-06606

    Ball bearing attachment: YB-06276-B/90890-06659

    [A] For USA and CANADA

    [B] Except for USA and CANADA

Drive shaft assembly

  1. Install:

    • Drive shaft bearing

    Bearing separator (7): YB-06219

    Bearing inner race installer (2):   90890-06643

    [A] For USA and CANADA

    [B] Except for USA and CANADA

CAUTION:

Do not strike the center race or rollers of the bearing. Contact should be made only with the inner race.

Lower case assembly

  1. Install:

    • Needle bearing

    Needle bearing position (a):   185 - 186 mm (7.28 - 7.32 in)

    Driver rod (1):   YB-06229/90890-06602

    Needle bearing plate (2):   YB-06231

    Needle bearing attachment 3):   YB-06082/90890-06615

    Bearing depth plate (4):   90890-06603

    [A] For USA and CANADA

    [B] Except for USA and CANADA

NOTE:

Install the drive shaft needle bearing with the manufacturer's marks (b) facing up.

  1. Install:

    • Forward gear shim(s)

    • Tapered roller bearing outer race

Driver rod:   YB-06071/90890-06605

Bearing outer race attachment:   YB-06085/90890-06625

Forward gear and drive shaft installation

  1. Install:

    • Pinion gear shim(s)

    • Drive shaft bearing outer race

Driver rod:   YB-06071/90890-06606

Bearing outer race installer:   90890-06167/90890-06628

  1. Install:

    • Forward gear (with the tapered roller bearing)

    • Pinion gear

    • Pinion gear nut

    Pinion gear nut:   50 Nm (5.0 m • kg, 36 ft • lb)

    Pinion nut holder:   YB-06078/90890-06505

    Drive shaft holder:   90890-06079-A/90890-06517