Isuzu N-Series. Service manual — part 23

0A-10 GENERAL INFORMATION

RECOMMENDED THREAD LOCKING AGENT

Notice:
When the application procedures are specified in this
manual, follow them.

LOCTITE

Application Steps

1. Completely remove all lubricant and moisture from

the bolts and the female threaded surfaces of the
parts to be joined.
The surfaces must be perfectly dry.

2. Apply LOCTITE to the bolts.

Apply LOCTITE to at least 1/3 of the bolt’s thread-
ed area.

3. Tighten the bolts to the specified torque.

Notice:
After tightening, be sure to keep the bolts free from vi-
bration and torque for at least an hour until LOCTITE
hardens.

TYPE

COLOR

LOCTITE 242

Blue

LOCTITE 262

Red

LOCTITE 271

Red

N0A0015E

MAINTENANCE AND LUBRICATION 0B-1

GENERAL INFORMATION

SECTION 0B

MAINTENANCE AND LUBRICATION

Contents

MAINTENANCE SCHEDULE . . . . . . . ... 0B-2
RECOMMENDED FLUIDS, LUBRICANTS AND DIE-
SEL FUELS. . . . . . . . . . . . . . . 0B-12

Recommended Fluids, Lubricants and Diesel Fuels. 0B-12

OIL VISCOSITY CHART. . . . . . . . . . 0B-15

Engine Oil . . . . . . . . . . . . . . 0B-15
Manual Transmission and Transfer Case Oil (Engine
Oil) . . . . . . . . . . . . . . . . ... 0B-16
Front Axle and Rear Axle Oil . . . . . . ... 0B-17

LUBRICATION CHART. . . . . . . . . ... 0B-18

NPR75 and NQR75 Models . . . . . . . 0B-18
NKR77 and NPR77 (Front Rigid Suspension) Models . . 0B-19
NKR77 (Front Independent Suspension) Model . . 0B-20

0B-2 MAINTENANCE AND LUBRICATION

MAINTENANCE SCHEDULE

When performing the checks on the following items, regular inspection items should also be checked.

Abbreviations

I :Inspect, clean and correct or replace as necessary
A : Adjust
R : Replace or change
T : Tighten to specified torque
L : Lubricate
[V] : Variation (optional on some models).
[OPT] : Optional equipment.
[SA] : For Smoother model only.
*Marks: Under severe driving conditions, more frequent maintenance is required. Refer to “Maintenance schedule un-
der severe driving conditions”.

Maintenance Schedule: 4JH1-TC Engine Model (Engine Oil that Meets or Exceeds ACEA B3 Speci-
fication)

SERVICE INTERVAL:

(Use odometer
reading or months
Whichever comes
first)

× 1,000
km

20

40

60

80

100

120

× 1,000
mile

12

24

36

48

60

72

ENGINE

*Engine oil

R

R

R

R

R

R

Or every 9 months

*Engine oil filter

R

R

R

R

R

R

Or every 9 months

Fuel filter

R

R

R

R

R

R

Or every 18 months

*Air cleaner element

I

I

R

I

I

R

Or every 36 months

Idling speed and acceleration

—

I

—

I

—

I

Or every 18 months

Valve clearances

—

—

A

—

—

A

Or every 36 months

Fuel tank cap and fuel pipes for
loose connections or damage

—

—

I

—

—

I

Or every 36 months

Drive belt tension and damage

I

I

I

I

I

I

Or every 9 months

Radiator coolant

—

—

R

—

—

R

Or every 36 months

*Exhaust pipes and mountings
for looseness or damage

—

I

—

I

—

I

Or every 18 months

Cooling system for water leak-
age

—

I

—

I

—

I

Or every 18 months

Engine operation condition

I

I

I

I

I

I

Or every 9 months

CLUTCH

Clutch fluid

I

I

R

I

I

R

Or every 24 months

Clutch pedal travel and free play

I

I

I

I

I

I

Or every 6 months

TRANSMISSION

*Manual transmission oil

I

I

R

I

I

R

Or every 24 months

Gear control mechanism for
looseness

—

—

I

—

—

I

Or every 24 months

Gear control cables

—

A

—

A

—

A

Or every 12 months

PROPELLER SHAFT

*Universal joints and sliding
sleeve grease

L

L

L

L

L

L

Or every 12 months

MAINTENANCE AND LUBRICATION 0B-3

Loose connections

I

I

I

I

I

I

Or every 6 months

Splines for excessive wear

—

—

I

—

—

I

Or every 24 months

Bearings and related parts for
looseness

—

—

I

—

—

I

Or every 24 months

Center bearing

L

L

L

L

L

L

Or every 12 months

REAR AXLE

*Differential gear oil

I

I

R

I

I

R

Or every 24 months

FRONT AXLE

*Kingpins

L

L

L

L

L

L

Or every 9 months

STEERING

Power steering system oil leak-
age

I

I

I

I

I

I

Or every 9 months

Power steering system for
looseness or damage

I

I

I

I

I

I

Or every 9 months

Power steering fluid

—

—

R

—

—

R

Or every 36 months

Power steering hoses

—

—

—

—

—

R

Or every 72 months

Fitting of knuckles and front axle
for looseness

I

I

I

I

I

I

Or every 9 months

Steering mechanism for loose-
ness or damage

—

—

I

—

—

I

Or every 36 months

Ball joints for damage (Indepen-
dent suspension model only)

I

I

I

I

I

I

Or every 9 months

Ball joints for excessive play
(Independent suspension model
only)

I

I

I

I

I

I

Or every 9 months

Relay lever shaft for excessive
play (Independent suspension
model only)

I

I

I

I

I

I

Or every 9 months

Steering wheel play

I

I

I

I

I

I

Or every 9 months

Steering function

I

I

I

I

I

I

Or every 9 months

Wheel alignment

—

—

I

—

—

I

Or every 36 months

SERVICE BRAKES

Brake fluid

I

I

R

I

I

R

Or every 36 months

Brake system for fluid leakage

I

I

I

I

I

I

Or every 9 months

*Brake linings and drums for
wear

I

I

I

I

I

I

Or every 9 months

*Disc brake pads and discs for
wear

I

I

I

I

I

I

Or every 9 months

Brake pedal travel and free play

I

I

I

I

I

I

Or every 9 months

Pipes and hoses for loose con-
nections or damage

I

I

I

I

I

I

Or every 9 months

PARKING BRAKE

SERVICE INTERVAL:

(Use odometer
reading or months
Whichever comes
first)

× 1,000
km

20

40

60

80

100

120

× 1,000
mile

12

24

36

48

60

72