Bendix Commercial Vehicle Systems C-300N HYDRAULIC POWER STEERING1/99 User Manual

Page 29

4. Repeat Step 3 - turning the steering wheel in the opposite

direction.

5. With the engine off remove the pressure relief test plug

assembly (106773). Reinstall the spring (43). Install a
new (unused) sealing washer (44) on the pressure relief

valve plug (42) then install the adjusting shims (41) in

the plug. Install the plug (42) in the valve body(7) and
torque to 66-73 pound feet.

IMPORTANT:

Step 5 must be completed before placing the vehicle back

in service.

TECHNICAL DATA

C-300N C-500N

Steering ratio

(input to output shaft)

21.2:1

21:1

Steering wheel revolutions for

90° rotation of output shaft

5.3

5.25

Maximum output

shaft rotation (Note 1)

95° Max. Travel

Maximum output

shaft torque with 1992 p.s.i.

1985 lb. ft.

3767

(140 Kg/C M2) power assist(270 mdaN)

(510)

Power steering fluid

DEXRON 11 ATF

Maximum working temperature

248°F (120°C)

Maximum peak temperature

302°F (150°C)

Maximum allowable pressure

See Note 2

(144 Kg/C M2)

Maximum pressure drop

in the return line

See Note 3

Maximum normal flow

See Note 3

Note 1: Maximum rotation is specified, maximum power

assisted rotation is less when steering limiting

optional feature is incorporated.

Note 2: Maximum working pressure is determined by the

pressure setting of the pressure relief valve when

that optional feature is incorporated. Maximum

allowable pressure for the C-300N is 2102 psi (145

bar) and for the C-500N is the same.

Note 3: The pressure drop and flow rate are interrelated

and application specific. Consult the vehicle

manufacturers maintenance manual for this

information.

TROUBLESHOOTING

PRELIMINARY CHECKS
Before proceeding to the troubleshooting headings, it is

strongly recommended that some preliminary checks be

made and a test ride be taken to eliminate unnecessary
work.
1. Check for proper and equal tire inflation on the steering

axle. Note any abnormal tire wear which may be

attributable to front end alignment.

2. Make certain the power steering reservoir oil level is

correct.

3. Make certain the power steering pump belt is not slipping.
4. Visually inspect the following components for obvious

damage, misadjustment and possible binding.

A. steering column and universals or couplings.
B. steering arms, tie rods, tie rod ends and knuckles.
C. general looseness in the steering linkages.

5. Check hoses for sharp bends, kinks and proper

size.

The most common faults may be grouped under the following

headings:
1. Power steering does not operate.
2. The power steering is stiff in one direction and normal in

the other.

3. The power steering tends to turn itself when the engine

is started.

4. Excessive free play at the steering wheel.
5. The power steering operates normally but is intermittently

hard.

6. Oil leaks.
7. The power steering is stiff when turning the steering wheel

quickly.

8. The power steering does not return correctly.
9. The power steering operates but with noise, turbulence

or vibration.

TORQUE CHART

Item

C-300N

C-500N

Valve Body Bolts (Item 40)

81-88 Pound Feet

92-99 Pound Feet

Side Cover Bolts (Item 49)

81-88 Pound Feet

92-99 Pound Feet

Side Cover Adjusting Screw Lock Nut (Item 32)

74-78 Pound Feet

Valve Body Valve Nut (Item 1)

221-257 Pound Feet

Steering Limiting Valve Seat (Item 17)

8-11 Pound Feet

Pressure Relief Valve Seat (Item 48)

15-18 Pound Feet

Pressure Relief Valve Plug (Item 42)

66-73 Pound Feet

Drain Plug (Item 54)

37-47 Pound Feet