Nissan Leaf. Manual - part 1154

TM-22

< UNIT REMOVAL AND INSTALLATION >

[REDUCTION GEAR: RE1F61B]

REDUCTION GEAR

Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of

electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are

handled incorrectly. Be sure to follow the correct work procedures when performing inspection and

maintenance.

WARNING:

• Be sure to remove the service plug in order to disconnect the high voltage circuits before perform-

ing inspection or maintenance of high voltage system harnesses and parts.

• The removed service plug must always be carried in a pocket of the responsible worker or placed in

the tool box during the procedure to prevent the plug from being connected by mistake.

• Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses

before beginning work on the high voltage system.

• Never allow workers other than the responsible person to touch the vehicle containing high voltage

parts. To keep others from touching the high voltage parts, these parts must be covered with an insu-

lating sheet except when using them.

• Refer to 

TM-5, "High Voltage Precautions"

.

CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise

instructed in the Service Manual. A malfunction may occur if this is not observed.

REMOVAL

WARNING:

Disconnect the high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

1. Check voltage in high voltage circuit. (Check that condenser are discharged.)
a. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

b. Disconnect high voltage harness connector and PTC heater harness connector from front side of Li-ion

battery. Refer to 

EVB-181, "Removal and Installation"

.

c.

Measure voltage between high voltage harness connector terminals and PTC heater harness connector

terminals.

DANGER:

 

 Touching high voltage components without using the appropriate protective equipment will

cause electrocution.

CAUTION:

For voltage measurements, use a tester which can measure to 500 V or higher.

2. Remove front under cover. Refer to 

EXT-23, "FRONT UNDER COVER : Removal and Installation"

.

Standard

: 5 V or less 

JPCIA0296ZZ

REDUCTION GEAR

TM-23

< UNIT REMOVAL AND INSTALLATION >

[REDUCTION GEAR: RE1F61B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

3. Remove drain bolt   of traction motor to drain coolant.

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

4. Drain reduction gear oil. Refer to 

TM-13, "Draining and Refill-

ing"

.

5. Remove electric power train and reduction gear from vehicle

together as suspension member assembly. Refer to 

FSU-22, "Removal and Installation"

.

6. Remove PDM (Power Delivery Module). Refer to 

VC-112, "Removal and Installation"

.

7. Remove traction motor inverter. Refer to 

TMS-103, "Removal and Installation"

.

8. Remove joint bolt (

) of motor mounting rear bracket and motor

mounting rear.

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

9. Remove joint bolt (

) of motor mounting LH bracket and motor

mounting LH.

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

10. Remove joint bolt (

) of motor mounting RH bracket and motor

mounting RH.

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

11. Hook the sling belt to each motor mounting bracket and prepare

to disconnect the traction motor and reduction gear from the

front suspension member assembly.

12. Hoist the traction motor and reduction gear and disconnect them from the front suspension member

assembly.

WARNING:

To prevent electric shock hazards, be sure to put on insulating protective gear before beginning

work on the high voltage system.

JSCIA0684ZZ

JSDIA3959ZZ

JSDIA3960ZZ

JSDIA3961ZZ

TM-24

< UNIT REMOVAL AND INSTALLATION >

[REDUCTION GEAR: RE1F61B]

REDUCTION GEAR

CAUTION:

When hoisting the traction motor and reduction gear, insert a long bolt into the motor mounting

bracket to prevent the sling belt from slipping out. At that time, be sure to install a nut.

13. Remove support bearing bracket of drive shaft (right side). Refer to 

FAX-19, "RIGHT SIDE : Removal and

Installation"

.

WARNING:

To prevent electric shock hazards, be sure to put on insulating protective gear before beginning

work on the high voltage system.

14. Remove motor mounting LH bracket  .

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

15. Remove motor mounting rear bracket  .

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

16. Remove motor mounting RH bracket  .

WARNING:

To prevent electric shock hazards, be sure to put on insulat-

ing protective gear before beginning work on the high volt-

age system.

17. Remove joint bolts traction motor and reduction gear.

WARNING:

To prevent electric shock hazards, be sure to put on insulating protective gear before beginning

work on the high voltage system.

18. Separate traction motor from reduction gear.

WARNING:

: Bolt

JSDIA3963ZZ

: Bolt

JSDIA3964ZZ

: Bolt

JSCIA0685ZZ

REDUCTION GEAR

TM-25

< UNIT REMOVAL AND INSTALLATION >

[REDUCTION GEAR: RE1F61B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

To prevent electric shock hazards, be sure to put on insulating protective gear before beginning

work on the high voltage system.

INSTALLATION

Note the following, and install in the reverse order of removal.

WARNING:

To prevent electric shock hazards, be sure to put on insulating protective gear before beginning work

on the high voltage system.

CAUTION:

When assembling the reduction gear and traction motor, clean the mating surface and be sure that no

dust, dirt, or foreign material is between the surfaces.
• Before installing reduction gear and traction motor, apply grease to full periphery of shaft spline  , and also

inject grease [minimum 10 g (0.4 oz), maximum less than 20 g (0.7 oz)] into reduction gear input shaft
(inside spline)  . Take care to prevent damage to O-ring   when installing.

CAUTION:

• Before applying grease, clean old grease and wear particles, that are adhered to the grease apply-

ing parts.

• When installing O-ring, clean the O-ring installation groove completely, and then install.

• When all parts are installed, be sure to check equipotential of traction motor, PDM (Power Delivery Module),

and traction motor inverter.

- Traction motor: Refer to 

TM-25, "Inspection and Adjustment"

.

- PDM (Power Delivery Module): Refer to 

VC-125, "Inspection"

.

- Traction motor inverter: Refer to 

TMS-107, "Inspection and Adjustment"

.

Inspection and Adjustment

INFOID:0000000010119532

INSPECTION AFTER INSTALLATION

After installing traction motor, measure resistance below.

• Between traction motor (aluminum part) and body (ground bolt).

• Between traction motor (aluminum part) and other high voltage system. 

WARNING:

To prevent electric shock hazards, be sure to put on insulating protective gear before beginning work

on the high voltage system.

JSDIA2307ZZ

Standard

: Less than 0.1 

Ω