Isuzu N-Series. Manual — part 122
POWER STEERING 3B1-7
Power Steering Unit
Removal
1. Remove the head light assembly. (for Non-Tilt Cab
Model, driver side only) Refer to “Headlight Re-
placement”.
2. Remove the under panel. (for Non-Tilt Cab Model)
3. Remove the front bumper assembly. (for Non-Tilt
Cab Model)
4. Remove the oil pipe.
Before disconnecting the oil pipe, clean the steer-
ing unit paying particular attention to the area
around the joint and plug or tape the oil port after
disconnecting the pipe to prevent entry of dust or
other foreign matter.
Legend
A. NHR, NKR
4. Universal joint
B. NPR, NQR, NPS
5. Unit fixing nut and bolt
1. Cotter pin
6. Power steering unit
2. Nut
7. Nut
3. Drag link
8. Pitman arm
N3A0447E
3B1-8 POWER STEERING
5. Cotter Pin
6. Nut
7. Drag Link
Disconnect the drag link at the knuckle arm and the
pitman arm.
Remover: 5-8840-2017-0
8. Universal Joint
Apply a setting mark (1) across the yoke and worm
shaft in unit to ensure reassembly of the parts in
the original position.
9. Unit Fixing Bolt and Nut
10. Power Steering Unit
11. Nut
12. Pitman Arm
Apply a setting mark (1) across the pitman arm and
worm shaft.
Puller: 5-8840-2051-1
N3A0122E
N3A0123E
N3A0124E
N3A0125E
POWER STEERING 3B1-9
Installation
1. Pitman Arm
Align the setting mark (1) applied at removal.
2. Nut
Tighten:
• Pitman arm nut to
NHR, NKR Rigid suspension: 216 N
⋅m (22 kg⋅m / 159
lb
⋅ft)
NPR, Wishbone suspension: 294 N
⋅m (30 kg⋅m / 217
lb
⋅ft)
3. Power Steering Unit
4. Unit Fixing Nut and Bolt
Tighten:
• Nut and bolt to 103 N
⋅m (10.5 kg⋅m / 76 lb⋅ft)
5. Universal Joint
Install the parts by aligning setting marks (1) ap-
plied at removal.
Tighten:
• Universal joint bolt to
M8 bolt: 25 N
⋅m (2.5 kg⋅m / 18 lb⋅ft)
6. Drag Link
7. Nut
8. Cotter Pin
1) Install the drag link to the pitman arm and the
knuckle arm.
2) Tighten nuts to specified torque, with just
enough additional torque to align cotter pin
holes. Install new cotter pin.
N3A0126E
N3A0125E
N3A0128E
N3A0124E
3B1-10 POWER STEERING
Tighten:
• Nut to 167 N
⋅m (17 kg⋅m / 123 lb⋅ft)
• Connect the oil pipe. Tighten flare nuts to specified
torque.
Tighten:
• Flare nut to 44 N
⋅m (4.5 kg⋅m / 33 lb⋅ft)
9. Install the bumper assembly. (for Non-Tilt Cab
Model)
Tighten:
• Bumper bolt to 40 N
⋅m (4.1 kg⋅m / 30 lb⋅ft)
10. Install the under panel. (for Non-Tilt Cab Model)
11. Install the head light assembly, front grille and front
combination light assembly. (for Non-Tilt Cab Mod-
el) Refer to “Headlight Replacement”.
Notice:
After installation, adjust head light aiming. Refer to “Cab
and Chassis Electrical”. (Non-Tilt Cab Model)
Power Steering Pump
Preparation
• Drain the fluid through the pipe which is connected
to the return board for the power steering pump.
• Disconnect the fluid piping.
Removal
4J Series Engine
• Loosen the idler pulley locking nuts (1) for the pow-
er steering pump.
• Loosen the adjusting bolts for the drive belt and re-
move the drive belt.
• Remove the pipe brackets (2) and clips (3) on the
alternator side.
• Remove the pump mounting brackets.
4HE1 Engine
• Block the vehicle wheels and apply the parking
brake.
• Disconnect the battery ground cable.
1. Disconnect air intake hose at turbocharger side.
2. Raise the vehicle and remove front exhaust pipe
with exhaust brake.
• Remove bolts at manifold, silencer and support
bracket.
3. Place a container under the hydraulic pump as-
sembly to catch fluid when disconnecting hoses.
Clean the surfaces around fittings before removing
them.
4. Remove power steering outlet flexible hose (1) and
nut.
5. Remove hydraulic booster outlet pipe (2) nut.
6. Remove two clips for hydraulic booster lines on the
flywheel housing.
7. Remove clip for hydraulic booster lines on the left
side member.
8. Hydraulic booster inlet hose (3).
9. Power steering inlet hose (4).
10. Remove hydraulic booster pipe from the pump.
11. Remove hydraulic pump assembly with bracket
and O-ring.
N3A0132E
N3A0135E
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