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Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection 2005 Subaru Forester

generation: → 2002 - 2007Release year → 2005 ✔ engine size → 2.5L ✔      add to compare      read later

POWER ASSISTED SYSTEM (POWER STEERING) > Steering Gearbox

INSPECTION

1. BASIC INSPECTION

1. Clean all disassembled parts, and check for wear, damage, or any other faults, then repair or replace as necessary.

2. When disassembling, check the inside of gearbox assembly for water. If any water is found, carefully check the boot for damage, input shaft dust seal, adjusting screw and boot clips for poor sealing. If faulty, replace with new parts.

No.

Parts

Inspection

Corrective action

1

Input shaft

(1) Bend of input shaft

(2) Damage on serration

If the bend or damage is excessive, replace the entire gearbox assembly.

2

Dust seal

(1) Crack or damage

(2) Wear

If the outer wall slips, the lip is worn out or damage is found, replace it with a new one.

3

Rack and pinion

Poor mating of rack with pinion

(1) Adjust the backlash properly.

By measuring the turning torque of gearbox and sliding resistance of rack, check if rack and pinion engage uniformly and smoothly with each other. (Refer to “Service limit”.)

(2) Keeping the rack pulled out all the way so that all teeth emerge, check teeth for damage.

Even if abnormality is found in either (1) or (2), replace the entire gearbox assembly.

4

Gearbox unit

(1) Bend of rack shaft

(2) Bend of cylinder portion

(3) Crack or damage on cast iron portion

Replace the gearbox assembly with a new one.

(4) Wear or damage on rack bush

If the free play of rack shaft in radial direction is out of the specified range, replace the gearbox assembly with a new one. (Refer to “Service limit”.)

(5) Wear on input shaft bearing

If the free plays of input shaft in radial and axial directions are out of the specified ranges, replace the gearbox assembly with a new one. (Refer to “Service limit”.)

5

Boot

Crack, damage or deterioration

Replace.

6

Tie-rod

(1) Looseness of ball joint

(2) Bend of tie-rod

Replace.

7

Tie-rod end

Damage or deterioration on dust seal

Replace.

8

Adjusting screw spring

Deterioration

Replace.

9

Boot clip

Deterioration

Replace.

10

Sleeve

Damage

Replace.

11

Pipes

(1) Damage to flared surface

(2) Damage to flare nut

(3) Damage to pipe

Replace.

2. SERVICE LIMIT

Make a measurement as follows. If it exceeds the specified service limit, adjust or replace.

NOTE:

When making a measurement, vise the gearbox assembly by using ST. Never vise the gearbox by inserting aluminum plates, etc. between vise and gearbox assembly.

ST    926200000STAND

Sliding resistance of rack shaft:

Service limit:

400 N (41 kgf, 90 lb) or less

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

3. RACK SHAFT PLAY IN RADIAL DIRECTION

Right-turn steering

Service limit:

0.19 mm (0.0075 in) or less

On condition

L: 5 mm (0.20 in)

P: 122.6 N (12.5 kgf, 27.6 lb)

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

Left-turn steering

Service limit:

Direction      2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection 2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

0.3 mm (0.012 in) or less

Direction      2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection 2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

0.15 mm (0.0059 in) or less

On condition

L: 5 mm (0.20 in)

P: 98 N (10 kgf, 22 lb)

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

4. INPUT SHAFT PLAY

In radial direction

Service limit:

0.18 mm (0.0071 in) or less

On condition

P: 98 N (10 kgf, 22 lb)

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

In axial direction

Service limit:

0.5 mm (0.020 in) or less

On condition

P: 20 - 49 N (2 - 5 kgf, 4 - 11 lb)

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

5. TURNING RESISTANCE OF GEARBOX

Using the ST, measure the gearbox turning resistance.

ST    34099PA100SPANNER

Service limit:

Maximum allowable resistance:

Less than 9.33 N (0.95 kgf, 2.10 lb)

Difference between right and left sliding resistance:

Less than 20%

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

6. OIL LEAKING

2005 Subaru Forester Steering • Power Assisted System (Power Steering) • Steering Gearbox • Inspection

(1)

Power cylinder

(3)

Rack piston

(5)

Input shaft

(2)

Cylinder

(4)

Rack axle

(6)

Valve housing

1. If the leak is found, it is necessary to thoroughly remove the fluid from the suspected portion and turn the steering wheel from lock to lock about thirty to forty times with engine running, then make comparison of the portion immediately after and several hours after this operation.

2. Inspect leakage from “a”

The oil seal is damaged. Replace the valve assembly with a new one.

3. Inspect leakage from “b”

The torsion bar O-ring is damaged. Replace the valve assembly with a new one.

4. Inspect leakage from “c”

The pipe is damaged. Replace the faulty pipe or O-ring.

5. If leak is other than a, b, c and if oil is leaking from the gearbox assembly, move the right and left boots toward tie-rod end side, respectively, with the gearbox assembly mounted to the vehicle, and remove fluid from the surrounding portions. Then, turn the steering wheel from lock to lock thirty to forty times with the engine running, then make comparison of the leaked portion immediately after and several hours after this operation.

(1) Leakage from “d”

The cylinder seal is damaged. Replace the rack bush with a new one.

(2) Leakage from “e”

There are two possible causes. Take the following step first. Remove the pipe B assembly from the valve housing, and close the circuit with ST.

ST    926420000PLUG

Turn the steering wheel from lock to lock thirty to forty times with the engine running, then make comparison of the leaked portion between immediately after and several hours after this operation.

• If leakage from “e” is noted again:

The oil seal of pinion and valve assembly is damaged. Replace the pinion and valve assembly with a new one. Or replace the oil seal and parts that are damaged during disassembly with new ones.

• If oil stops leaking from “e”:

The oil seal of rack housing is damaged. Replace the oil seal and the parts that are damaged during disassembly with new ones.

    2017-02-20 18:50:38    2017-06-19 10:25:05




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