Isuzu N-Series. Service manual — part 124
POWER STEERING 3B1-15
Caution:
• Be careful because the oil seal may suddenly fly
out due to air pressure.
• Take care not to damage the pipe seating area in
port.
4. Lock Nut
5. Bolt
6. Sector Shaft Assembly and Side Cover Assembly
When removing, take care so as not to cause dam-
age to the serrations, threads and oil seal.
7. Bolt
8. Valve Housing and worm shaft Assembly
Remove piston with valve housing.
Always keep ball-nut assembly in a horizontal po-
sition and avoid holding it vertically.
9. Body Assembly
Inspection and Repair
Make necessary correction or parts replacement if wear,
damage or any other abnormal conditions are found
through inspection.
Visual Check
Inspect the following parts for wear, damage or other ab-
normal conditions.
• Gear box
• Sector shaft
• Needle roller bearing
• Piston and worm shaft
• Oil seal, Dust cover, Y-gasket, O-ring and seal ring
Gear Box
Check the body for cracks, and body inner surface and
piston sliding surface for scratches.
Legend
1. Plug
2. Stub shaft
1
2
N3A0449E
N3A0142E
N3A0144E
NPR . NQR . NPS
NHR . NKR
N3A0450E
3B1-16 POWER STEERING
Sector Shaft
If the shaft is worn, twisted, scratched or partially worn,
replace it with a new one.
Bearing
If the bearing race surface is worn, scratched or seized,
replace it with a new assembly.
Piston and Worm Shaft
If the piston surface is remarkable worn or play is exces-
sive, replace with a new assembly.
Measurement of Sector Shaft Outside Diameter
Standard: 39.975 mm (1.574 in)
Limit: 39.925 mm (1.572 in)
Measurement of Play between Sector Shaft and
Needle Roller Bearing
Limit: 0.12 mm (0.0047 in)
N3A0159E
N3A0470E
N3A0451E
N3A0162E
POWER STEERING 3B1-17
Valve Housing Assembly
Measure the end play of the ball screw in the axial direc-
tion.
A: 16 mm (0.6299 in)
F: 39 N (4 kg/11 lb)
B (end play): 0.5 mm (0.0197 in) or less
Reassembly
1. Body Assembly
2. Valve Housing Assembly
Tighten:
• Valve housing and worm shaft assembly bolt to
NHR, NKR: 59 N
⋅m (6.0 kg⋅m / 43 lb⋅ft)
NPR, NQR, NPS: 103 N
⋅m (10.5 kg⋅m / 76 lb⋅ft)
Install the parts with the valve side turned to front
and worm gear of piston toward the sector gear.
Apply liquid to the valve housing contact surface.
3. Bolt
4. Sector Shaft Assembly and Side Cover Assembly
5. Bolt
Tighten:
• Side cover bolt to 59 N
⋅m (6.0 kg⋅m / 43 lb⋅ft)
Align the center tooth (1) of piston (ball nut (2)) with
that of the sector shaft (3).
6. Lock Nut
1) Install drop arm.
2) Hold the sector shaft in a straight ahead posi-
tion.
3) With the adjuster screw, adjust the preload to
specification.
Preload Between Sector Shaft and Ball Nut
1.3 N
⋅m (0.13 kg⋅m/1 lb⋅ft) or less
Legend
1. Neutral position
N3A0163E
N3A0164E
N3A0144E
N3A0192E
3B1-18 POWER STEERING
4) Apply liquid gasket to the lock nut. Adhesive liq-
uid gasket (JIS K6820 Category 1), HERME
SEAL 101Y, THREE BOND 1102 or equivalent
5) Tighten the lock nut.
Tighten:
• Lock nut to 69 N
⋅m (7.0 kg⋅m / 51 lb⋅ft)
7. Oil seal
• Use new one.
• Apply a thin coat of power steering fluid to the
lip, and check the installation direction.
Installer: 5-8522-0026-0
8. Dust seal
• Face the dust lip side outward.
9. Retaining ring
• Face the surface with chamfered periphery to-
ward the oil seal side.
• Use new one.
N3A0469E
N3A0452E
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