Eaton Char-Lynn 5 Series Bedienungsanleitung

Power Steering

Repair Information

Square Housing

with Side Ports

Round Housing

with Side Ports

Round Housing

with End Ports

5 Series

Steering

Control Units

001

2EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003

Dust

Seal

Housing Quad

Seal**

Thrust

Bearing

Sleeve

Spool

Centering

Springs*

Bearing

Race (2)

O-ring

Seal**

O-ring

Seal**

Wear

Plate

Drive

Gerotor

Spacer

Manual Steering

Relief Valve

O-ring**

O-ring** Seal

Ring**

End

Cap

Screw

(7)

Plug

Check

Ball

Spring

Retaining

Ring*

Round Housing

and Square

Housing with

Side Ports

REPLACEMENT PART NO. DESCRIPTION

64456-00 Centering Spring Kit (contains parts with *)

64455-00 Seal Kit (contains parts with **)

*Round housing shown,

but applies to square

housing also.

Tools Required

• 10 mm Socket

• 7/8 in. Socket

• Torque Wrench

(18 Nm [160 lb-in]

Capacity)

• Small Blade Screwdriver

O-ring

Seal

O-ring

Seal

Wear

Plate Drive

Gerotor

Seal

Ring

Spacer

Manual Steering

Check/Relief Valve

O-ring

O-ring O-ring

End

Cap

Screw

(7)

Plug

Dust

Seal

Housing Quad

Seal

Thrust

Bearing

Bearing Race (2)

Spool and Sleeve

EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003 3

Round Housing

and Square

Housing with

Side Ports

Disassembly

Cleanliness is extremely

important when repairing

hydraulic Steering Control

Units (SCU). Work in a clean

area. Before disconnecting the

hydraulic lines, clean the port

area of the SCU. Before disas-

sembly, drain the oil, then plug

the ports and thoroughly clean

the exterior of the SCU.

During repairs, always protect

machined surfaces.

Disassembly

1. Remove the seven cap

screws and disassemble

the SCU as shown in

figure 1.

2. Remove the plug and

manual steering check

as shown in figure 1.

Note: The manual steering

check may be a check ball

or a check/relief valve.

Disassembly

3. Slide the spool and sleeve

from the housing, see

figure 2.

4. Remove the thrust bearing

and bearing races.

5. Remove the quad seal.

Disassembly

6. Using a small blade screw-

driver, carefully pry the

dust seal from the housing.

Important: Do not damage

the dust seal seat.

Figure 1

Figure 2

4EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003

Standard Torque

Centering Springs

and Spacers

Sleeve

Spool

Spring

Retaining

Ring

Disassembly cont.

7. Remove the pin that holds

the spool and sleeve

together, see figure 3.

8. Carefully slide the spool out

of the sleeve. The springs

and retaining ring will stay

with the spool as it’s

removed.

9. Remove the retaining ring

and springs.

Caution: The centering

springs are under tension;

remove the retaining ring

carefully.

Figure 3

Figure 4 Figure 5

Reassembly

Check all mating surfaces.

Replace any parts with

scratches or burrs that could

cause leakage. Wash all metal

parts in clean solvent. Blow

them dry with pressurized air.

Do not wipe parts dry with

paper towels or cloth as lint

in a hydraulic system will

cause damage.

Note: Always use new

seals when reassembling

hydraulic steering control

units. Refer to page 2 for

seal kit part numbers.

Important: During reassembly

lubricate the new seals with

a petroleum jelly such as

Vaseline®. Also lubricate

machined surfaces and bear-

ings with clean hydraulic fluid.

Reassembly

10. Install the quad seal:

•Put one of the bearing

races and sleeve into

the housing.

•Together, the housing and

bearing race create a

groove into which the

quad seal will be installed.

•Hold the bearing race tightly

against the input end of the

housing by pushing on the

gerotor end of the sleeve.

•Fit the quad seal into its

seat through the input end

of the housing. Be sure

the seal is not twisted.

•Remove the sleeve and

bearing race.

Reassembly

11. Lubricate and install the

dust seal (see Figure 4 for

correct seal orientation).

12. Install the centering

springs in the spool. It is

best to install the two flat

pieces first. Next, install

the curved pieces, three

at a time.

13. Fit the retaining ring over

the centering springs.

14. Apply a light coating of

clean hydraulic fluid to

the spool and slide it into

the sleeve. Be sure the

centering springs fit into

the notches in the sleeve.

15. Install the pin

(see Figure 3).

Reassembly

16. Apply a light coating of

petroleum jelly to the

inner edge of the dust

and quad seals.

17. Put the thrust bearing and

races into the housing.

The thrust bearing goes

between the two races

(see Figure 2).

18. Apply a light coating of

clean hydraulic fluid to

the spool and sleeve

assembly and slide it

into the housing.

Important: Do not dam-

age the dust or quad

seals.

19. Clamp the housing in a

vise as shown in Figure 5.

Use just enough clamping

force to hold the housing

securely.

Quad Seal

Dust Seal Thrust Bearing

and Race (2)

Round Housing

and Square

Housing with

Side Ports

EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003 5

Reassembly cont.

20. Lubricate and install a new

o-ring seal in the groove in

the housing.

21. Install the wear plate and

align the holes in the wear

plate with threaded holes

in the housing.

Note: The holes in

the wear plate are

symmetrical.

22. Install the drive, be sure

the slot in the drive

engages the pin.

23. Lubricate and install a new

o-ring seal in the groove in

the wear plate.

24. Install the gerotor and

align the screw holes.

25. Lubricate and install a new

o-ring seal in the groove in

the gerotor ring.

26. Lubricate and install a new

o-ring and seal ring in the

groove in the gerotor star.

27. Install the spacer.

28. Install end cap and seven

cap screws. Tighten cap

screws, in a crisscross

pattern, to 16 -18 Nm

[140 -160 lb-in].

29. Remove the SCU from

the vise.

30. Install the relief

valve/check or check ball

and plug. Use a new o-ring

and tighten the plug to

17 Nm [150 lb-in].

Round Housing

and Square

Housing with

Side Ports

6EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003

Round Housing

with End Ports

Housing

Dust

Seal

Quad

Seal**

Thrust

Bearing

Sleeve

O-ring

Seal**

Bearing Race (2)

Spool

Centering

Springs*

O-ring

Seal

Wear

Plate

Drive

Spacer

Spring

Retaining

Ring*

O-ring**

Seal

Ring**

End

Cap

Cap Screw

Gerotor

Manual

Steering

Check/Relief

Valve

Plug

O-ring

REPLACEMENT PART NO. DESCRIPTION

64456-000 Centering Spring Kit (contains parts with *)

64455-000 Seal Kit (contains parts with **)

Tools Required

•10 mm Socket

•7/8 in. Socket

•Torque Wrench

(18 Nm [160 lb-in]

Capacity)

•Small Blade Screwdriver

EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003 7

Housing

Dust

Seal

Quad

Seal

Thrust

Bearing

Bearing Race (2)

Spool and

Sleeve

Round Housing

with End Ports

Disassembly

Cleanliness is extremely

important when repairing

hydraulic Steering Control

Units (SCU). Work in a clean

area. Before disconnecting the

hydraulic lines, clean the port

area of the SCU. Before disas-

sembly, drain the oil, then plug

the ports and thoroughly clean

the exterior of the SCU.

During repairs, always protect

machined surfaces.

Disassembly

1. Remove the plug and inlet

relief as shown in figure 1.

Note: The manual steering

check is part of the inlet

relief valve. If inlet relief

valve is not present, the

manual steering check is

located in the housing.

2. Remove the four cap

screws and disassemble

the SCU as shown in

figure 1.

Disassembly

3. Slide the spool and

sleeve from the housing,

see figure 2.

4. Remove the thrust bearing

and bearing races.

5. Remove the seal.

Disassembly

6. Using a small blade

screwdriver, carefully pry

the dust seal from the

housing.

Important: Do not damage

the dust seal seat.

Figure 1

Figure 2

O-ring

Seal

O-ring

Seal

Wear

Plate Drive

Spacer

O-ring O-ring

Seal

Ring

End

Cap

Cap Screw

Gerotor

Manual

Steering

Check/Relief

Valve

Plug

O-ring

Dust

Seal

8EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003

Standard Torque

Centering Springs

and Spacers

Sleeve

Spool

Spring

Retaining

Ring

Disassembly cont.

7. Remove the pin that holds

the spool and sleeve

together, see figure 3.

8. Carefully slide the spool out

of the sleeve. The springs

and retaining ring will stay

with the spool as it’s

removed.

9. Remove the retaining ring

and springs.

Caution: The centering

springs are under tension;

remove the retaining ring

carefully.

Figure 3

Figure 4 Figure 5

Reassembly

Check all mating surfaces.

Replace any parts with

scratches or burrs that could

cause leakage. Wash all metal

parts in clean solvent. Blow

them dry with pressurized air.

Do not wipe parts dry with

paper towels or cloth as lint

in a hydraulic system will

cause damage.

Note: Always use new seals

when reassembling hydraulic

steering control units. Refer

to seal kit part numbers on

page 6.

Important: During reassembly

lubricate the new seals with a

petroleum jelly such as

Vaseline®. Also lubricate

machined surfaces and bear-

ings with clean hydraulic fluid.

Reassembly

10. Install the quad seal:

•Put one of the bearing

races and sleeve into

the housing.

•Together, the housing and

bearing race create a

groove into which the quad

seal will be installed.

•Hold the bearing race tightly

against the input end of the

housing by pushing on the

gerotor end of the sleeve.

•Fit the quad seal into its

seat through the input end

of the housing. Be sure the

seal is not twisted.

•Remove the sleeve and

bearing race.

Reassembly

11. Lubricate and install the

dust seal (see Figure 4 for

correct seal orientation).

12. Install the centering

springs in the spool. It is

best to install the two flat

pieces first. Next, install

the curved pieces, three

at a time.

13. Fit the retaining ring over

the centering springs.

14. Apply a light coating of

clean hydraulic fluid to the

spool and slide it into the

sleeve. Be sure the center-

ing springs fit into the

notches in the sleeve.

15. Install the pin

(see Figure 3).

Reassembly

16. Apply a light coating of

petroleum jelly to the

inner edge of the dust

and quad seals.

17. Put the thrust bearing and

races into the housing.

The thrust bearing goes

between the two races

(see Figure 2).

18. Apply a light coating of

clean hydraulic fluid to

the spool and sleeve

assembly and slide it

into the housing.

Important: Do not dam-

age the dust or quad

seals.

19. Clamp the housing in a

vise as shown in Figure 5.

Use just enough clamping

force to hold the housing

securely.

Quad Seal

Dust Seal Thrust Bearing

and Race (2)

Round Housing

with End Ports

EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003 9

Reassembly cont.

20. Install manual steering

check ball and pin into

housing, if no relief valve

is present.

21. Lubricate and install a new

o-ring seal in the groove in

the housing.

22. Install the wear plate and

align the timing groove

on plate with the timing

groove on the housing.

Note: The holes in

the wear plate are

not symmetrical.

Reassembly cont.

23. Install the drive, be sure

the slot in the drive

engages the pin.

24. Lubricate and install a new

o-ring seal in the groove in

the wear plate.

25. Install the gerotor and

align the timing groove

with the timing groove in

the wear plate.

26. Lubricate and install a new

o-ring seal in the groove in

the gerotor ring.

Reassembly cont.

27. Lubricate and install a new

o-ring and seal ring in the

groove in the gerotor star.

28. Install the spacer.

29. Install end cap and four

cap screws. Align timing

groove on endcap with

timing groove on gerotor.

Tighten cap screws, in

a crisscross pattern, to

16 -18 Nm [250 lb-in].

Reassembly cont.

30. Install the relief

valve/check if present.

Use a new o-ring and

tighten the plug to 17 Nm

[150 lb-in].

31. Remove the SCU from

the vise.

32. Check SCU and confirm all

timing grooves are in line.

Note: If timing grooves

are not aligned properly,

SCU will not function.

Round Housing

with End Ports

10 EATON Char-Lynn Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003

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