Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 2035

3B-30  STEERING

  INSPECTION AND REPAIR

Make necessary correction or parts replacement if wear, damage or any other abnormal conditions are found
through inspection.

•

 Bearing

•

 Oil seal, bushing

•

 Ball-nut and worm shaft

•

 Sector shaft

•

 Gear box

Visual Check

Inspect the following parts for wear, damage or other abnormal
conditions.

Ball-Nut Rotation

Hold the worm shaft vertically and check that the ball-nut
lowers with a smooth turning motion.  If the lowering of the ball-
nut by its own weight is not smooth, check the worm shaft for
bending and the ball-groove for burrs, dents, and foreign
matter.
Note :
When testing the ball-nut assembly, do not let it travel all
the way to the end of worm shaft, or damage to the ball
tubes will result.

Sector Shaft Outside Diameter

mm(in)

Standard

Limit

A

28.6 (1.13)

28.3 (1.12)

B

31.8 (1.25)

31.5 (1.24)

STEERING  3B-31

  REASSEMBLY

Reassembly Steps

1. Gear box
2. Oil seal
3. Bearing
4. Bearing
5. Ball nut and worm shaft
6. Oil seal
7. O-ring

V

8. End cover

V

9. Lock nut

V

10. Sector shaft
11. Needle bearing

V

12. Adjust shim
13. Adjust screw

V

14. Gasket

V

15. Side cover

V

16. Lock nut

3B-32  STEERING

Important Operations

8. End Cover

(1) When installing, take care so as not to cause damage to the

oil seal.

Taping the splines will provide some protection.

(2) Adjust the bearing preload by using socket.

Bearing Preload

N

⋅

m (kgf

⋅

m/Ib

⋅

ft)

0.29 - 0.59 (0.03 - 0.06/0.22 - 0.43)

9. Lock Nut

Lock Nut Torque

N

⋅

m (kgf

⋅

m/Ib

⋅

ft)

176.5

±

19.5 (18.0

±

2.0/130.2

±

14.4)

Lock Nut Wrench : 5-8840-2006-0

(J-29753)

End Cover Installer : 5-8840-2007-0

(J-7624)

Note:
After tightening, check the bearing preload.

10.Sector Shaft
Align the center tooth of the ball-nut with that of the sector
shaft.

STEERING  3B-33

12.Adjust Shim
Adjust the clearance and check that the adjusting screw turns
freely.
Clearance

mm (in)

0.1 (0.004)

Adjusting shims available

mm (in)

1.524 (0.0600)
1.554 (0.0612)
1.585 (0.0624)
1.615 (0.0636)
1.646 (0.0648)

14.Gasket

15.Side Cover
Apply liquid gasket to the joining surface of each parts.

16.Lock Nut
Adjust the backlash between the sector gear and ball-nut.
(1) Install the pitman arm.

(2) Check that the sector shaft moves smoothly in the correct

working angle range, then semi-tighten the lock nut.

(3) Measure preload of worm gear.

Preload

N

⋅

m (kgf

⋅

m/Ib

⋅

ft)

less than 1.079 (0.11/0.795)

Note:
Obtain the specified backlash by turning the adjust screw.

The backlash should be measured at the drop arm end.
Backlash

mm (in)

0.2 (0.008)