BENDIX C-300N HYDRAULIC POWER STEERING User manual

1
®
C-300N/C-500N HYDRAULIC POWER STEERING GEAR
SD-30-4265
POWER STEERING GEAR
DESCRIPTION
The Compact 300N and 500N (C-300N/C-500N), Hydraulic
Power Steerin Gears are desi ned for medium and heavy
duty vehicles with front axle wei ht ratin s of 6,000 to 9,000
lbs for the C-300N and up to 15,000 lbs for the C-500N.
They are inte ral power steerin ears incorporatin the
mechanical and hydraulic actuation and control components
in a sin le cast housin which serves as the power cylinder.
The C-300N and C-500N power steerin ears are very similar
in appearance with the major difference bein that the C-
500N is proportionately lar er than the C-300N.
The vehicles steerin column is coupled to the ear at the
input shaft which transmits steerin effort throu h a
recirculatin ball screw (spindle assembly) and piston. The
piston is an inte ral part of the power assist and also acts
as a steerin damper. The direction and de ree of power
assist is controlled by a rotary hydraulic valve which is inte ral
to the input shaft and spindle assembly. An en ine driven
hydraulic pump supplies the flow and pressure.
VALVE
BODY
PRESSURE
RELIEF & BYPASS
VALVE CAP NUT
C-300N
HOUSING
OUTPUT
SHAFT
INPUT
SHAFT
NAMEPLATE
ADJUSTING
SCREW
SIDE COVER
VALVE BODY
OUTPUT
SHAFT
OIL
SUPPLY
OIL RETURN
STEERING
LIMITING STEM
PLUG
C-500N
OUTPUT
SHAFT NAME PLATE
OIL RETURN
OIL SUPPLY ADJUSTING
SCREW
C-300N

2
SD-30-4265
TABLE OF CONTENTS
DESCRIPTION .............................................................. 1
OPERATION .................................................................. 1
 General ........................................................................ 1
 Mechanical .................................................................. 3
 Hydraulic ..................................................................... 4
 Rotary Control Valve .................................................... 4
 Steerin Limitin Valve ................................................ 7
 Pressure Relief Valve ................................................... 8
 Bypass Valve ............................................................... 8
POWER STEERING IDENTIFICATION ......................... 8
PREVENTIVE MAINTENANCE ..................................... 8
 Power Steerin Oil ....................................................... 8
 Drainin and Fillin the System ................................... 8
 Oil Chan e Intervals .................................................... 8
 Output Shaft Sector Teeth Adjustment .......................... 8
 Output Shaft Boot & Dust Seals ................................... 9
CAUTION NOTE ........................................................... 9
REMOVAL ..................................................................... 9
SPECIAL TOOLS .......................................................... 9
DISASSEMBLY .............................................................11
 General .......................................................................11
 Output Shaft Removal .................................................11
 Piston ........................................................................ 13
 Main Housin & Side Cover ....................................... 15
 Valve Body & Spindle ................................................ 16
 Output Shaft .............................................................. 18
 Pressure Relief & Bypass Valve ................................ 18
 Spindle ...................................................................... 18
CLEANING & INSPECTION ........................................ 19
REASSEMBLY ............................................................. 19
 General ...................................................................... 19
 Valve Body & Spindle ................................................ 19
 Piston ........................................................................ 21
 Housin ..................................................................... 24
 Output Shaft & Side Cover......................................... 25
ADJUSTMENT ............................................................ 26
 Piston to Output Shaft Gear Backlash ........................ 26
 Stroke Limitin Stem .................................................. 27
ON-VEHICLE POWER STEERING TESTS ................ 27
 Preliminary ................................................................ 28
 Pressure Relief Valve ................................................. 28
 Internal Leaka e ........................................................ 28
TECHNICAL DATA ...................................................... 29
ASSEMBLY TORQUE CHART .................................... 29
TROUBLESHOOTING ................................................ 30

3
FIGURE 1 - MECHANICAL OPERATION
FIGURE 2 - SPINDLE ASSEMBLIES
INPUT
SHAFT
PISTON
STEERING
WHEEL
PITMAN
ARM
SPINDLE
ASSEMBLY
PITMAN
ARM
PISTON
OUTPUT
SHAFT
RIGHT HAND
THREAD
LEFT HAND
THREAD
BALL
SCREW
PISTON OVER OUTPUT SHAFT MOUNTING
(LEFT HAND THREAD SPINDLE)
VEHICLE
RIGHT
TURN
STEERING
WHEEL
PISTON UNDER OUTPUT SHAFT MOUNTING
(RIGHT HAND THREAD SPINDLE)
OUTPUT
SHAFT SPINDLE
ASSEMBLY
INPUT
SHAFT
VEHICLE
LEFT
TURN
INPUT
SHAFT
OPERATION
GENERAL
Both steerin ears are composed of mechanical and
hydraulic power assist components.
Actual steerin is accomplished mechanically. Effort applied
at the vehicles steerin wheel results in mechanical
movement within the steerin ear which causes the vehicle
to chan e its direction of travel. The hydraulic power assist
components function solely to reduce the mechanical effort
required to turn the vehicles steerin wheel. Loss of hydraulic
power will in no way prevent the vehicle from bein
maneuvered mechanically, however reater effort will be
required to turn the steerin wheel.
MECHANICAL OPERATION
The turnin effort exerted by the driver on the steerin wheel
is transmitted to the input shaft which is part of the spindle
assembly. The spindle and piston function like a screw and
nut throu h the action of a chain of recirculatin balls that
serve as an interface. Rotation of the spindle causes axial
movement of the piston within the power cylinder. Gear teeth,
cut directly into the piston, mesh with correspondin ear
teeth on the output shaft. As the piston moves, the output
shaft and the attached pitman arm are rotated. Figure 1
Spindle and piston sets are provided with either ri ht or left
hand screw threads. Figure 2 The manner in which the
steerin ear is mounted on the vehicle determines of the
thread used. Figures 1, 2 & 3

4
FIGURE 3 - POWER STEERING GEAR MOUNTING CONFIGURATION
TIE
ROD DRAG
LINK
PISTON OVER
OUTPUT SHAFT
STEERING
ARM
PITMAN
ARM
TIE ROD
ARM
SPINDLE
ASSEMBLY
PISTON UNDER
OUTPUT SHAFT
When the steerin ear is mounted on the vehicle in a position
similar to the pisto u der output shaft illustration in figure
1, the piston and spindle used will have a ri ht hand thread.
A left hand thread is required when the steerin ear is
mounted in a position similar to the pisto over output
shaft illustration. In either mountin position, a ri ht turn is
accomplished when the input shaft is rotated clockwise and
the output shaft, alon with the pitman arm, rotate toward
the rear of the vehicle.
HYDRAULIC OPERATION
GENERAL
Functionin to ether, the spindle and valve body assemblies
serve as a means of flow and pressure control for the power
assist portion of the steerin ear. All hydraulic fluid enters
and exits the power steerin ear throu h lines connected
to the threaded ports in the valve body.
The valve body assembly forms a closure for the housin
and provides a means of retainin the spindle assembly. It
contains a series of circular channels and radial passa es
which serve to direct the flow of hydraulic oil into and out of
the rotary control valve in the spindle assembly. In addition,
the valve body can contain an optional pressure relief and
bypass valve. The pressure relief valve ensures that a preset
maximum pressure is not exceeded. It is always set at a
pressure level below that of the power steerin pump relief
valve and is intended to limit the power assist to a specific
maximum level. Figure 8
The optional bypass valve is intended to lessen the manual
steerin effort required in the event hydraulic pressure is
lost. The bypass valve permits fluid to circulate within the
steerin ear rather than bein forced to and from the power
steerin pump and reservoir. Figure 9
The spindle assembly rotates on a ball bearin in the bore
of the valve body. The spindle is composed of three major
parts;, the input shaft, torsion bar, and ball screw. One end
of the input shaft is finely splined for connection to the
steerin column while the other end has a coarse spline
which mates loosely with a similar spline inside the ball
screw. The coarse splines form mechanical stops which
limit the amount of relative rotation between the ball screw
and input shaft. Six evenly distributed lon itudinal rooves
are machined into the outer surface of the input shaft and
correspond to six rooves machined into the bore of the
ball screw. The torsion bar is pinned to the ball screw and
input shaft and forms a sprin connection between the two.
With the input shaft inserted into the ball screw the six
rooves of each of these components alternate with each
other and form the hydraulic rotary control valve. Holes on
the outside surface of the ball screw extend into the six
rooves within its bore. Figure 5
These holes allow pressurized oil to enter and exit the two
parts of the rotary control valve. There are three roups of
holes in the ball screw. Each roup is made up of three
different size holes which form a dia onal line across the
surface of the ball screw. The lar est hole in each roup
conducts pressurized oil into the rooves of the rotary
control valve. The second lar est hole in each roup
conducts oil out of the rotary control valve to the side of the
power piston furthest from the rotary control valve while the
smallest hole conducts oil to the closest side of the piston.
Figures 5 & 6

5
C-500N DETAIL
STEM PLUG
STEERING
LIMITING STEM
SPINDLE
ASSEMBLY
INPUT
SHAFT
ROTARY VALVE
BALL SCREW
TORSION BAR
RACK AND
SECTOR GEAR
OUTPUT
SHAFT
PISTON
HOUSING
STEERING
LIMITING STEM
POPPET
SEAT
POPPET
VALVE
RECIRCULATING
BALLS
STEERING
LIMITING
STEM
VALVE
BODY
VALVE NUT
SIDE
VIEW
FIGURE 4 - POWER STEERING GEAR
ADJUSTING
SCREW
ADJUSTING
SCREW LOCK
NUT
SIDE COVER
BALL TUBE
BALL TUBE
COVER
POPPET VALVE
SEAT
HOUSING
PISTON
RECIRCULATING
BALLS
RACK AND
SECTOR GEAR
OUTPUT
SHAFT
DUST
SEAL
DUST BOOT
SEAL AND
BACKUP RING
ROLLER
BEARINGS
NAMEPLATE
ADJUSTING
SCREW SPACER
END
VIEW

6
FIGURE 5 - SPINDLE ASSEMBLY WITH ROTARY VALVE COMPONENTS
FIGURE 8 - ROTARY VALVE OPERATION
BALL SCREW
(OUTER VALVE ELEMENT) OIL IN OIL OUT (RIGHT TURN)
OIL IN
SUPPLY
OIL OUT
LEFT TURN
TORSION BAR PIN
OIL RETURN (TO
PUMP RESERVOIR)
PIN HOLE
OIL OUT LEFT
TURN
OIL OUT RIGHT TURN
OIL OUT
RIGHT TURN
ROTARY VALVE
LONGITUDINAL
GROOVES ( )
(INSIDE HIDDEN
FROM VIEW)
OIL OUT
(LEFT TURN)
TORSION BAR OIL IN
SUPPLY
OUTER VALVE
ELEMENT GROOVE
OIL RETURN (TO
PUMP RES.)
INNER VALVE
ELEMENT GROOVE
SPINDLE ASSEMBLY
TORSION
BAR PIN OIL RETURN HOLES
(HIDDEN FROM VIEW)
INPUT SHAFT (INNER
VALVE ELEMENT)
TORSION BAR
STEERING
STOP
SPLINES
ROTARY
VALVE
GROOVES
( )
OIL
RETURN
HOLE
(FROM
PISTON
CAVITY)
OIL RETURN
HOLES (TO
PUMP RES.)
INPUT SHAFT
(ROTARY VALVE
INNER ELEMENT)
INPUT SHAFT &
TORSION ASSEMBLY
BALL SCREW
(ROTARY VALVE
OUTER ELEMENT)
SPINDLE ASSEMBLY
OIL OUT
(LEFT TURN)
OIL IN
OIL OUT
RIGHT
TURN
INPUT SHAFT (INNER
VALVE ELEMENT) BALL SCREW
(OUTER VALVE
ELEMENT)
TO
PUMP
RES.
OIL IN
OIL OUT
RIGHT
TURN
OIL OUT
(LEFT TURN)
OIL IN
OIL
RETURNING
FROM RIGHT
TURN SIDE OF
POWER
PISTON
OIL RETURNING
FROM LEFT TURN
SIDE OF POWER
PISTON
ROTARY CONTROL VALVE OPERATION
The rotary control valve is an open center type which allows
a continuous flow of oil (throu h the lon itudinal rooves in
the input shaft and bore of the ball screw) when held in the
neutral position by the torsion bar.
When steerin effort is applied, the input shaft and ball screw
tend to turn in unison, however the sprin action of the torsion
bar results in the input shaft rotatin sli htly in advance of
the ball screw. The six pairs of rooves that form the rotary
control valve are displaced from their neutral flow position.
As steerin effort increases, so does the amount of
displacement. Dependin on the direction steered, the roove
displacement of the input shaft directs hydraulic oil throu h
the appropriate drilled passa es in the ball screw to one
side or the other of the piston. Hydraulic pressure actin
TO
PUMP
RES.
TO
PUMP
RES.
LEFT TURN NEUTRAL RIGHT TURN

7
upon the piston surface eliminates much of the pistons
resistance to movement. Sprin force exerted by the torsion
bar causes the ball screw to rotate as piston resistance is
removed. As the ball screw rotates, the relative roove
displacement is eliminated and the rotary valve returns to a
neutral position.
Moderate effort at the steerin wheel produces smaller valve
displacements and lower power assist, thus providin ood
steerin feel. At Increased displacements, the pressure rises
more rapidly ivin increased power assistance and quicker
response. Maximum pressure is developed after
approximately 30 displacement ivin a direct feel to the
steerin . Groove displacement is limited by the clearance
of the stop spline mesh between the input shaft and ball
screw. The splines take up the steerin movement while
allowin the torsion bar to hold the roove displacement.
The torsion bar and stop splines form two parallel means of
transmittin the steerin torque. When no steerin torque
is applied, the torsion bar returns the valve rooves to a
neutral position allowin the pressurized oil to flow to the
return line. Fi ures 5 & 6.
STEERING LIMITING VALVE OPERATION
In steerin ears equipped with steerin limitin valve, power
assisted movement of the piston within its bore is limited by
poppet valves installed in both piston faces. As the piston
approaches its extreme travel in either direction, a stem
unseats the steerin limitin poppet valve. Some hydraulic
power assist is removed as pressurized oil passes around
the poppet valve to the other side of the piston and to the
return line. Continued movement of the piston will result in
removal of increasin amounts of power assist and cause
increased steerin effort. Steerin limitin reduces the
maximum power assist that can be transmitted to the axle
steerin linka es and components. Fi ure 7 When this feature
is incorporated in the C-300N, only one of the two steerin
limitin stems is externally adjustable. Both steerin limitin
stems in the C-500N are externally adjustable. Fi ure 4.
PRESSURE RELIEF VALVE OPERATION
The pressure relief valve is an option. Located in the valve
body, the pressure relief valve limits hydraulic pressure
within the power steerin ear to a preset maximum. While
the settin of the pressure relief valve may be adjusted to
various levels dependin upon part number and application,
it is always set to a pressure lower than the relief valve on
the power steerin pump. Fi ure 8.
FIGURE 7 - STEERING LIMITING POPPET VALVE OPERATION
HOUSING
PRESSURIZED SIDE
DURING RIGHT TURN
INPUT
SHAFT
LIMITING
STEM
BALL
SCREW
POPPET SEAT
RETURN
SIDE OF
PISTON
O-RING
OUTPUT
SHAFT
POPPET VALVES
(STEERING LIMITING)
PISTON
SPINDLE ASSEMBLY
OUTPUT
SHAFT
INPUT
SHAFT
PISTON
PISTON
ADJUSTABLE STEM
POPPET
VALVE
LIMITING
STEM
PRESSURIZED SIDE
OF PISTON DURING
LEFT TURN
POPPET VALVE
SPRING
EXTREME LEFT TURN POSITION POPPET VALVE OPEN EXTREME RIGHT TURN POSITION POPPET VALVE OPEN
FIGURE 8 - PRESSURE RELIEF VALVE OPERATION
INPUT
SHAFT
OIL
RETURN
CHANNEL
POWER
STEERING
GEAR
HOUSING VALVE
BODY
ADJUSTING
SHIMS
SPRING
PRESSURE
RELIEF
VALVE
PLUG
SPRING
SEAT
BYPASS
VALVE
PRESSURE
RELIEF VALVE
& PISTON
OIL SUPPLY
PORT
OIL RETURN
PORT

8
BYPASS VALVE OPERATION
The optional bypass valve is located adjacent to the pressure
relief valve in the valve body.
When it is necessary to steer the vehicle without the power
steerin pump in operation, the bypass valve permits oil to
flow from the return to the supply passa es within the
steerin ear. As the power piston moves inside the housin ,
oil displaced from one side is transferred to the other throu h
the bypass valve thus preventin reservoir floodin and
cavitation in the pressure line. Fi ure 9
POWER STEERING GEAR IDENTIFICATION
A nameplate is attached to the exterior of the housin
enerally on one of the mountin lu s. The information found
on the name ta is illustrated
PREVENTIVE MAINTENANCE
POWER STEERING OIL
It is important that an approved oil be used to ensure proper
operation of the power steerin unit. The vehicle
manufacturers recommendations should be adhered to.
Once an oil type is in use, it should never be mixed with any
other type. If it should become necessary to chan e types
of oil, the entire system must be drained followin the
procedure below.
DRAINING AND FILLING THE SYSTEM
1. Lift the front axle sufficiently to raise the wheels clear of
the round.
2. Remove the drain plu (54) and seal washer(53) or
disconnect the return line at the valve body outlet port.
(The outlet port is identified by the arrow which flows out
of the ear.) Turn the steerin wheel to the left as far as
it will o. Run the en ine for 10 seconds at the most
until the oil is drained from the reservoir and pump. Switch
off the en ine and turn the steerin wheel backwards
and forwards from full lock to full lock until all the oil is
drained out.
3. Clean the outside of the reservoir. Remove and replace
the old filter element.
4. Fill reservoir full of oil.
5. Turn the en ine over with the starter motor. (Must be
done in a manner that the en ine does not start.) Add oil
as the level drops to avoid air bein drawn into the
system.
6. When the oil level reaches the full mark on the dipstick,
start the en ine and turn the steerin wheel slowly from
side to side until air bubbles cease to appear in the
reservoir. Refill reservoir to full mark on the dipstick.
7. The oil level should be checked every 2,000 miles. The
correct level is between the minimum and maximum level
marks on the dipstick with the en ine stopped.
OIL CHANGE INTERVALS
It is recommended that the oil be chan ed at 40,000 mile
intervals and at the time of rebuild. Beyond its function as
the media for transmittin power, the oil also serves to
lubricate and dissipate heat. Carefully clean, inspect, and
replace if necessary all filter elements in the pump system
includin vents and breathers.
OUTPUT SHAFT SECTOR TEETH
ADJUSTMENT
The ear lash or preload between the piston teeth and sector
ear should not require attention in normal service, however
a provision for adjustment is provided.
Adjustment requires that the steerin ear be drained and
the pitman arm and input shaft be disconnected from the
vehicle. The adjustment procedure is described at the end
of the assembly section of this manual.
POWER STEERING GEAR NAMEPLATE INFORMATION
SERIAL NUMBER
BENDIX ASSEMBLY
PART NUMBER MONTH ASSEMBLED
(A = JAN., ETC.
VEHICLE
MFGR
PART
NUMBER
LOCATION OF
MANUFACTURE
YEAR ASSEMBLED
(LAST DIGIT)
FIGURE 9 - BYPASS VALVE OPERATION
INPUT
SHAFT
OIL
RETURN
CHANNEL
POWER
STEERING
GEAR
HOUSING VALVE
BODY
SPRING
BYPASS
VALVE
OIL SUPPLY
PORT
OIL RETURN
PORT

9
FIGURE 10 - TOOLS FOR ASSEMBLY/DISASSEMBLY
PART NUMBER 10 234 (REQUIRED)
PART NUMBER 297 7 (REQUIRED)
PART NUMBER 298077 (OPTIONAL)
PART NUMBER 10 7 2 (OPTIONAL)
SPANNER WRENCH - REQUIRED FOR REMOVAL
AND INSTALLATION OF THE VALVE NUT.
SEATING TOOL - REQUIRED TO FORM TEFLON GLIDE RINGS
AND TO INSTALL SPINDLE ASSEMBLY IN VALVE BODY.
PILOTED SCREWDRIVER - USED TO REMOVE AND
INSTALL THE PRESSURE RELIEF VALVE SEAT.
HOLDING FIXTURE - USED TO HOLD THE PISTON AND
VALVE BODY DURING ASSEMBLY AND DISASSEMBLY.
EXTERIOR BOOTS AND DUST SEALS
Inspect the inte rity of the output and input shaft boot and
dust seal. These components prevent contamination from
enterin the housin around the shaft. If deterioration is
noted, these components should be replaced. The cavities
between the boots and seals should be filled with special
hi h temperature rease.
IMPORTANT! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO AVOID
PERSONAL INJURY OR DEATH:
When workin on or around a vehicle, the followin eneral
precautions should be observed at all times.
1. Park the vehicle on a level surface, apply the parkin
brakes, and always block the wheels.
2. Stop the en ine when workin around the vehicle.
3. If the vehicle is equipped with air brakes, make certain
to drain the air pressure from all reservoirs before
be innin ANY work on the vehicle.
4. Followin the vehicle manufacturers recommended
procedures, deactivate the electrical system in a manner
that removes all electrical power from the vehicle.
5. When workin in the en ine compartment the en ine
should be shut off. Where circumstances require that
the en ine be in operation, EXTREME CAUTION should
be used to prevent personal injury resultin from contact
with movin , rotatin , leakin , heated, or electrically
char ed components.
6. Never connect or disconnect a hose or line containin
pressure; it may whip. Never remove a component or
plu unless you are certain all system pressure has
been depleted.
7. Never exceed recommended pressures and always wear
safety lasses.
8. Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thorou hly understand the recommended procedures.
Use only the proper tools and observe all precautions
pertainin to use of those tools.
9. Use only enuine Bendix replacement parts,
components, and kits. Replacement hardware, tubin ,
hose, fittin s, etc. should be of equivalent size, type,
and stren th as ori inal equipment and be desi ned
specifically for such applications and systems.
10. Components with stripped threads or dama ed parts
should be replaced rather than repaired. Repairs requirin
machinin or weldin should not be attempted unless
specifically approved and stated by the vehicle or
component manufacturer.
11. Prior to returnin the vehicle to service, make certain all
components and systems are restored to their proper
operatin condition.
REMOVING THE POWER STEERING GEAR
1. Mark or identify the inlet and return lines at the valve
body ports.
2. Drain the system followin the instructions presented
under Preventive Maintenance. Remove both inlet and
return lines.
3. Disconnect the steerin column at the input shaft
followin the vehicle manufacturers instructions.
4. Disconnect the pitman arm from the vehicles steerin
linka e usin the vehicle manfacturers instructions.
CAUTION: If it is necessary to remove the pitman arm
before the steerin ear is removed from the vehicle,
DO NOT USE HEAT OR POUND ON THE PITMAN
ARM OR OUTPUT SHAFT as dama e can result. Do
not attempt repairs to these components. They must be
replaced if dama ed. Use a lar e ear puller to remove
the pitman arm such as Snap-On puller #CG-283 or
Ford part number T64P-3590-F.

10
3
4
5
7
8
9
1
2
14
15
1
11
12
17
19
18
28
28
29
53
13
4 47
51
42
43
41
23
24
25
2
27
20
21
22
44
37
38
40
3
39
35
45
49
34
32
31
54
29
30
33
9
35
9
50
48
9
2
17
18
9
7
21
20
19
10
52
A 1
B 2
C-500N DETAIL OF VALVE
BODY AND STEERING
LIMITING STEM
ALTERNATE BALL
RETURN TUBE STYLE
FOR C-300/N/C-500N
FIGURE 7 - C-300N / C-500N POWER STEERING GEAR
1. Valve Nut
2. External Dust Seal
3. Spindle Assembly
4. Internal Dust Seal
5. Seal
6. all Cage
7. Valve ody
8. all Race
9. all
10. Teflon Ring
11. O-Ring
12. O-Ring
13. Steering Limiting Stem
14. Seal Ring
15. O-Ring
16. Spring
17. Valve Seat
18. Sealing Washer
19. Steering Limiting Stem
20. O-Ring
21. Plug
22. Housing
23. Piston
24. Tube Cover
25. Output Shaft
26. Rollers
27. O-Ring
28. ackup Ring
29. Seal & ackup Ring
30. Retaining Ring
31. Side Cover
32. Nut
33. Adjusting
34. Adjusting Screw Spacer
35. all Tube
36. Retaining Ring
37. O-Ring
38. Dust Seal
39. Dust oot
40. olt
41. Adjusting Shims
42. Pressure Relief Valve Plug
43. Spring
44. Sealing Washer
45. Spring Seat
46. Valve Piston
47. Seal Washer
48. Valve Seat
49. olt
50. Retaining Ring
51. ypass Valve Spring
52. ypass all Valve
53. Seal Washer
54. Drain Plug
POWER STEERING PARTS LIST

11
FIGURE 13 - REMOVING/INSTALLING INPUT SHAFT DUST
BOOT FIGURE 14 - VALVE BODY BOLT REMOVAL
FIGURE 12 - PREPARATION FOR DISASSEMBLY
5. Remove the steerin ear from the vehicle.
SPECIAL TOOLS
Two special tools are required to disassemble/assemble the
C- 300N and C-500N. The tools listed and illustrated here
are useful but not all required. All special tools may be
obtained from authorized Bendix part outlets.
DISASSEMBLY
GENERAL
A hi h level of cleanliness should be observed at all times
when workin on the power steerin ear. Clean the exterior
of all parts prior to disassembly.
The followin disassembly and assembly procedure is
presented for reference purposes and presupposes that a
major rebuild of the power steerin ear is bein
undertaken. Several replacement parts and maintenance
kits are available which do not require full disassembly. The
instructions provided with these parts and kits should be
followed in lieu of the instructions presented here.
After removin the power steerin ear from the vehicle and
cleanin the outside, secure the power steerin ear to the
work bench for disassembly. A lar e vise with jaw protectors
may be used. Clamp across the mountin bolt bosses. (Do
not overti hten.) Figure 12
OUTPUT SHAFT REMOVAL
1. Remove the external dust boot (2) from the spindle
assemblys input shaft spline. Figure 13

12
FIGURE 17 - SIDE COVER REMOVAL/INSTALLATION
FIGURE 15 - SEPARATING VALVE BODY & HOUSING
FIGURE 16 - REMOVING/INSTALLING PITMAN ARM & DUST
BOOT
2. Scribe a line or otherwise mark the relationship of the
valve body to the housin . Usin a 19mm wrench remove
the four bolts (40) that secure the valve body (7) to the
housin (22). Figure 14
3. Separate the valve body(7) from the housin (22) by
rotatin the output shaft (25) usin the pitman arm. It
may be necessary to hold or rotate the input shaft (3)
durin this operation. Continue to separate the valve
body from the housin until both O-rin s (12) on the
valve body can be seen. Figure 15.
4. Scribe a line or otherwise mark the relationship of the
pitman arm to the output shaft (25), then remove the
pitman arm, then the dust boot (39). Figure 16
CAUTION: Do not use heat or pound on the pitman arm
or output shaft as dama e can result. These components
must be replaced rather than repaired if they are
dama ed. Remove any accumulated dirt, rease, rime,
and corrosion from the exposed portion of the output
shaft to facilitate removal throu h its seals.

13
FIGURE 18 - SIDE COVER & ROLLER BEARINGS
FIGURE 19 - REMOVING OUTPUT SHAFT
5. Loosen and remove the lock nut (32) from adjustin
screw (33) on the side cover(31) usin a 19mm wrench.
6. Scribe a line or otherwise mark the relationship of the
side cover (31) to housin (22). Usin a 19mm wrench,
remove the four bolts (49) that secure the side cover to
the housin . Figure 17
7. Separate the side cover from the housin by turnin the
adjustin screw (33) clockwise with a 7mm socket.
Continue turnin the adjustin screw until the side cover
can be removed from the housin (22). When the side
cover is removed from the housin the 17 rollers in the
side cover bearin (26) will fall out loose. These rollers
MUST NOT BE INTERCHANGED with the rollers in the
housin bearin which is identical. Figure 17 & 18.
CAUTION: Do not attempt to remove the outer race of
the roller bearin from the side cover.
8. Install the pitman arm and use it to center the piston(23)
and output shaft (25) ear teeth inside the side cover
openin of the housin . Remove the pitman arm and
then remove the output shaft by tappin ently on the
splined end with a soft mallet.
When the output shaft is removed from the housin , the
17 rollers in the housin bearin (26) will fall out loose.
These rollers MUST NOT BE INTERCHANGED with the
rollers in the side cover bearin which is identical.
CAUTION: Do not attempt to remove the outer race of
the roller bearin from the housin . Figure 19

14
FIGURE 21- TUBE COVER DISASSEMBLY/ASSEMBLY
FIG. 23 - DISASSEMBLY/INSTALLATION BALL TUBE & BALLS
FIGURE 24 - BALL TUBE COVER O-RING
FIGURE 20 - PISTON REMOVAL/INSTALLATION
FIGURE 22 - TUBE COVER DISASSEMBLY/ASSEMBLY
PISTON REMOVAL & DISASSEMBLY
9. While preventin rotation of the input shaft end of the
spindle assembly (3), pull the valve body (7) and piston
(23) out of the housin (22). Figure 20
10. Remove the retainin rin (36), ball tube cover (24), the
ball tube (35), and 7 of the 26 balls (9) from the piston(23).
Remove the sealin rin (37) from the piston. Note: Bendix
ho ding fixture 297678 which is pictured is a convenience
but not a necessity for disassemb y. Figures 21 to 24
11. In order to remove the remainin 19 balls (9) from piston,
rotate the input shaft in the direction (clockwise or
counterclockwise) that threads the spindle assembly OUT
OF THE PISTON.

15
FIGURE 25 - REMOVING/INSTALLING SPINDLE
FIGURE 27 - REMOVING/INSTALLING STEERING LIMITING
COMPONENTS
FIGURE 26 - REMOVING/INSTALLING PISTON SEALING RING
& O-RING
FIGURE 28 - REMOVING/INSTALLING STEERING LIMITING
STEM
SEALING WASHER
ITEM 18SEALING WASHER
ITEM 18 SPRING ITEM 1
VALVE
SEAT
ITEM 17
BALL
ITEM 9
VALVE
SEAT
ITEM 17
PISTON ITEM 23
BALL
ITEM 9
Separate the valve body and spindle from the piston.
Check the inside of the piston for any stray balls (9)
that may not have been removed in the operation above.
A total of 26 balls, 7 from the ball tube and 19 from the
piston, should be accounted for. Figure 25
12. Remove the sealin rin (14) and O-rin (15) below it
from the roove in the piston (23). Figure 26
13. If the steerin ear is not equipped with a steerin limitin
valve feature, disre ard steps 13-15. Remove either of
the steerin limitin valve seats (17) and sealin washer
(18) from the piston. Either a Phillips or strai ht blade
screwdriver will be required, dependin upon which of
the two styles of body is in use. Figure 27
Note: Care must be taken during this operation since
damage to the screwdriver s ot wi make remova
difficu t.
14. Remove one of the two balls (9), the sprin (16), then
the remainin ball (9). Referrin to the previous step,
remove the remainin steerin limitin valve seat (17)
and its sealin washer(18) from the other end of the
piston. Figure 27
HOUSING & SIDE COVER DISASSEMBLY
15. Remove the steerin limitin stem protective plu (21)
from the housin . Usin a screwdriver remove the stroke
limitin valve stem (19) from the housin and separate
the O-rin (20) from the stem. Figure 28
16. Remove the O-rin (27) from the side cover (31). Remove
the seal (29) and its split nylon backup rin (28) from

16
FIGURE 31 - REMOVING/INSTALLING HOUSING OUTPUT
SHAFT SEAL
FIGURE 29 - REMOVING INSTALLING SIDE COVER SEAL &
O-RING
FIGURE 30 - REMOVING/INSTALLING HOUSING OUTPUT
SHAFT DUST SEAL
the side cover bore. The nylon split rin comes out
separately but is part of the seal (29). Figure 29 Note:
The two piece sea (sea and ny on sp it ring) may not
be used in a steering gears. A one piece sea is
sometimes used instead.
CAUTION: Do not remove the outer race of the roller
bearin from the side cover.
17. Carefully pry out and remove the dust seal (38) from the
housin (22). Figure 30
18. Reachin throu h the side cover openin of the housin
(22), remove the output shaft seal (29) and its split nylon
backup rin (28) which comes out separately but is
part of the seal (29). Figure 31 Note: The two piece sea
(sea and ny on sp it ring) may not be used in a steering
gears. A one piece sea is sometimes used instead.
CAUTION: Do not remove the outer race of the roller bearin
from the housin .
VALVE BODY & SPINDLE DISASSEMBLY
19. If the steerin ear is not equipped with the steerin
limitin feature, this STEP MAY BE DISREGARDED.
Follow the appropriate procedure:
C-300N POWER STEERING GEARS
In the C-300N power steerin ear, the steerin limitin
stem is threaded into a blind hole in the valve body and
is accessible only after the valve body(7) has been
removed from the housin (22). Check the condition and
len th of the limitin stem (13) in the valve body (7). The
len th of the stem measured from the surface of the
valve body to the tip of the stem should be specified in
the vehicle service manual. If the limitin stem is of the
correct len th and in ood condition, DO NOT REMOVE
it. The limitin stem can be removed if necessary by
heatin the steerin limitin stem usin a hot air un to
soften the Loctite compound. Care must be taken to
minimize the amount of heat applied to the stem. DO
NOT OVERHEAT! The stem may be removed by turnin
counterclockwise. After removal, clean Loctite residue
from the hole.
Use a M6X1 tap to clean the tapped hole. If M6X1 tap is
not available, hole should be cleaned with solvent and
dried well.
C-500N POWER STEERING GEAR
In the C-500N power steerin ear, the steerin limitin
stem in the valve body (7) is identical to the one in the
housin (19, 20, 21) and can be removed or adjusted

17
FIGURE 34 - VALVE NUT & VALVE BODY FIGURE 36 - SPINDLE ASSEMBLY BALL BEARING
FIGURE 33 - VALVE NUT TO VALVE BODY SAFETY POINT
FIGURE 32 - INPUT SHAFT DUST SEAL
FIGURE 35 - REMOVING/INSTALLING SPINDLE ASSEMBLY
externally without removal of the valve body (7) from the
housin (22). See the inset in fi ure 4 and 11.
Remove the steerin limitin stem protective plu (21)
from the valve body (7) and usin a screw driver, remove
the steerin limitin stem (19) and O-rin (20) from the
valve body (7). Separate and discard the O-rin (20)
from the stem (19).
20. Remove the input shaft dust seal (4) from the valve nut
(1). Fi ure 32
21. With a drift punch, unblock the safety point between
the valve nut (1) and valve body (7). Usin Spanner
wrench 106234 loosen and remove the valve nut (1) from
the valve body (7). Fi ures 33 & 34
22. Grasp the input shaft end of the spindle assembly(3)
and lift the spindle assembly (3), ball ca e (6), 17 balls
(9) and one half of the outer race (8) out of the valve
body. Fi ure 35

18
FIGURE 39 - OUTPUT SHAFT & ADJUSTING SCREW
FIGURE 40 - PRESSURE RELIEF & BYPASS VALVE
COMPONENTS
SPRING
ITEM 43
SEALING WASHER
ITEM 44
PLUG
ITEM 44
SHIMS
ITEM 41
FIGURE 38 - VALVE BODY SEALS & O-RINGS
FIGURE 37 - VALVE NUT SEAL
23. Separate the outer race (8), ball ca e (6) and 17 balls
(9) from the spindle assembly (3). Figure 36
24. Do ot remove the other half of the ball bearin outer
race (8) in the valve body.
25. Remove the retainin rin (50) and then the seal (5) from
the valve nut (1). Figure 37
26. Remove the two outside O-rin s (12) from the valve
body, then remove the three Teflon rin s (10) and the
correspondin three O-rin s (11) from the spindle bore.
Figure 38
OUTPUT SHAFT DISASSEMBLY
27. Remove the retainin rin (30), the adjuster screw spacer
(34) and the adjuster screw (33) from the output shaft
(25). Figure 39
VALVE
PISTON
ITEM 4
SEAT
ITEM 48
BYPASS
VALVE BALL
ITEM 52
SPRING
ITEM 51
SEAL ITEM 47
SPRING SEAT
ITEM 45

19
FIGURE 41 - INSTALLING PRESSURE RELIEF SPRING SEAT
PRESSURE RELIEF & BYPASS VALVE
DISASSEMBLY
28. If the steerin ear is equipped with a pressure relief
valve, be in disassembly by removin the plu (42) and
its sealin washer (44) from the valve body (7). Figure
40.
29. Remove the sprin (43), sprin seat (45), adjustin shims
(41) and the valve piston (46). Figure 40.
30. Usin a wide bladed screwdriver or tool 298077, remove
the valve seat (48) and its sealin washer (47). If the
ear is so equipped, remove the bypass valve sprin
(51) and the ball (52).
SPINDLE DISASSEMBLY
CAUTION: Do not attempt disassembly of the spindle
assembly which contains the rotary valve. Individual
replacement parts are NOT available. It must be treated
as a sin le component.
CLEANING AND INSPECTION
CLEANING
Wash all parts individually in clean solvent and dry thorou hly.
All non-metallic parts should be discarded and replaced with
new.
INSPECTION
Parts found broken, cracked, distorted, excessively pitted,
or scored must be replaced. Cause for the replacement of
any part should be investi ated and corrected to prevent
reoccurrence.
Visually inspect all parts carefully payin particular attention
to:
1. Bearin s and bearin surfaces should not exhibit
brinellin , pittin , spallin or cracks. If, upon inspection,
it is determined that the outer races of the roller bearin s
(26) contained in the housin (22) or the side cover (31)
are not serviceable, the entire housin or side cover must
be replaced. If the outer ball bearin race (8) remainin
in the valve body (7) is not serviceable, the entire valve
body must be replaced. Inspect the bearin surfaces of
both the inputs.
2. Gear teeth in the output shaft and piston may show
si ns of polishin and sli ht wear; however, pittin ,
spallin , and cracks should not be present.
3. Output and input shaft splines.
4. Check the ball rollin surfaces on the exterior of spindle
and interior of piston for cracks, pittin , spallin and
brinellin .
5. Exterior of piston and interior of housin bore.
Note: Minor scuffing of the piston exterior and housing
bore can be considered norma . If deep scoring is
detected, the affected parts shou d be rep aced as
eakage wi occur and steering contro and reaction
wi be affected. Do not attempt honing or boring of
these parts as eakage rates wi increase.
6. Pitman arm.
7. Exterior of housin and its mountin lu s.
8. Valve body and portin .
REASSEMBLY OF THE POWER STEERING
GEAR
GENERAL
To ensure proper operation of the power steerin ear, the
followin procedure and its sequence should be carefully
followed. Failure to do so may result in dama e to the ear
or faulty operation or both.
The appropriate maintenance kits should be obtained prior
to reassembly.
VALVE BODY & SPINDLE REASSEMBLY
1. If the power steerin ear is so equipped, install the
bypass valve ball (52) and sprin (51) in the valve body
(7). Figure 40.
2. Install the sealin washer (47) around the pressure relief
valve seat (48) and usin a lar e bladed screwdriver or
tool piece number 298077, install both in the valve
body(7). Ti hten the valve seat to between 15 and 18
pound feet. Figure 40.
3. Install the pressure relief valve piston (46), sprin seat
(45), and sprin (43) in the valve body. Figure 41.
CAUTION: The sprin seat (45) must be installed as
illustrated in Figure 40. Incorrect installation of the sprin

20
FIGURE 43 - INSTALLING SPINDLE ASSY. BALL BEARINGS
FIGURE 42 - FORMING VALVE BODY TEFLON RING & O-
RING
seat will result in malfu ctio of the relief valve a d
damage to the valve pisto a d seat.
4. Install the pressure adjustin shims (41) and the seal
washer (44) on the plu (42). Install the plu in the
valve body and torque to between 66 and 73 pound feet
usin a 26mm socket. Note: When insta ing the
pressure adjusting shims (41) use the shims that were
removed during disassemb y. However, if a comp ete
rebui d of the power steering ear is underway, it may
be necessary to add or subtract shims in order to
properly set the pressure relief valve. Fi ure 40
5. Install the three O-rin s (11) and three Teflon rin s (10)
in the appropriate rooves in the valve body(7). Form
(expand) the Teflon rin s into their rooves by pushin 
Bendix tool 297676 throu h the bore of the valve body.
Note: Pre ubricate the too with a ight fi m or ithium
base grease. The spind e assemb y can be used to
assist in pushing the too through the bore. Figure 42 &
38
6. Install the two O-rin s (12) on the valve body (7). Figure
38
7. Install the ball ca e (6) over the input shaft end of the
spindle assembly (3). Usin a eneral purpose lithium
base rease to hold them in place, install the seventeen
balls (9) in the ball ca e. Figure 43
8. Install the outer ball bearin race half (8) over the input
shaft end of the spindle assembly (3) and insert the
spindle assembly throu h Bendix tool 297676. Insert
the spindle and tool into the valve body (3) until tool
completely exits the other side and the seventeen balls
(9) of the bearin assembly are restin a ainst the outer
race (8) in the valve body. Figure 44
9. Position the pressure side of the seal (5) in the bore of
the non-pressure side of the valve nut(1). Carefully drive
the seal into the bore until the retainin rin roove
within the bore is visible. Install the retainin rin (50)
makin certain it is completely seated in the roove.
After installin the retainin rin , ently tap the seal (5)
from the opposite side until it rests squarely a ainst the
snap rin (50). Note: The sea (5) can be driven into
the va ve body bore using a piece of round brass stock
with a diameter of 1.55 inches. Figure 45
10. Apply Loctite 932 or 567 to the tread of the valve nut (1)
Note: Due to the proximity of the spind e ba bearing,
use extreme care in app ying the Loctite to the va ve
nut threads and a ow adequate cure time. Makin
certain not to dama e the seal (5), install the valve nut
(1) over the input shaft end of the spindle assembly (3)
and into the valve body (7). Usin Bendix tool 106234,