Eaton Char-Lynn User manual

T E

Power Steering

Steering Control Unit (SCU)

Parts and Repair Information

Square Housing

with Side Ports

Round Housing

with Side Ports

Round Housing

with End Ports

5 Series

Steering

Control Units

001

2 EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

Series 5

Steering

Control Unit

Table of Contents

Introduction

This manual provides service

information for Char-Lynn®

Series 5 Steering Control Units.

Step by step instructions for

complete disassembly, inspec-

tion and reassembly of the con-

trol unit are given.

The following recommendations

should be followed to insure

successful repairs.

• Most repairs require the

removal of the control unit

from the vehicle.

• Cleanliness is extremely

important.

• Clean the port areas thor-

oughly before disconnecting

the hydraulic lines.

• Plug the control unit ports and

cover open hydraulic lines

immediately after they have

been disconnected.

• Drain the oil and clean the

exterior of the control unit

before making repairs.

• Wash all metal parts in clean

solvent.

• Use filtered, moisturefree

compressed air to dry the

parts. Do not wipe them dry

with paper towels or cloth –

lint in a hydraulic system will

cause damage.

• Always use new seals when

reassembling hydraulic control

units.

• Lubricate new rubber seals

with a petroleum jelly before

installation.

•Torque all bolts over gasketed

joints, then repeat the

torquing sequence to make

up for gasket compression.

After all repairs are complete it

is essential to verify the accura-

cy of control unit repairs on an

authorized test stand.

Introduction ......................................................................................................................................................................................................2

General Information

Ordering Parts..........................................................................................................................................................................................3

Tools ........................................................................................................................................................................................................3

Round and Square Housing with Side Ports

Exploded View..........................................................................................................................................................................................4

Parts List ..................................................................................................................................................................................................5

Disassembly ............................................................................................................................................................................................6

Reassembly..............................................................................................................................................................................................7

Round Housing with End Ports

2-Piece Shaft Seal Assembly..........................................................................................................................................................................12

3EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

General

Information

Ordering Parts

How to Order

Replacement Parts Each order must include

the following:

1. Product Number

2. Date Code

3. Part Name

4. Part Number

5. Quantity of Parts

Refer to specific part listings

for your Char-Lynn® Steering

Control Unit when ordering

replacement parts. Listings are

available from Eaton. Sample

tag shows identification.

For additional literature contact

Eaton Hydraulics at:

14615 Lone Oak Road

Eden Prairie, MN 55344

http://hydraulics.eaton.com

Tools Required:

• 10 mm Socket (13 mm Socket

for End-Ported Units)

• 7/8 in. Socket

•Torque Wrench

(31 Nm [275 lb-in] Capacity)

• Small Blade Screwdriver

SpecialTools:

• Plunger and SleeveTool (two-

piece seal) No. 600801-001*

* Tools available—by special order—

through our service department.

Tools

Port Face

Eaton Corp. Hydraulics Div.

Eden Prairie, MN 55344

Customer part number

or base unit number if it

has a column or valve

assembled

Bar Code Label — Launch Date June, 1999

Month / Day / Year

Eaton Part Number

4 EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

Dust

Seal

Housing Quad

Seal**

Thrust

Bearing

Sleeve

Spool

Standard Torque

Centering Springs*

Bearing

Race (2)

O-ring

Seal**

O-ring

Seal**

Wear

Plate

Drive

Gerotor

Manual Steering

Relief Valve

O-ring**

O-ring** Seal

Ring**

End

Cap

Screw

(7)

Plug

Check

Ball

Spring

Retaining

Ring*

Low Torque

Centering Springs*

Round and

Square Housing

with Side Ports

ExplodedView

*Round housing shown,

but applies to square

housing also.

5EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

Round and

Square Housing

with Side Ports

Parts List

ITEM NO. PART NO. QTY. DESCRIPTION REFERENCE PAGE

1 See Table 2.0 7 Cap Screw, Hex Head 6

2 22994-000 1 Cap, End

4 See Table 2.0 1 Gerotor, Sub-assembly 6

5 22993-000 1 WearPlate

6 4994693-001 1 Drive

9 22853-000 1 Drive Pin

13 4997396-001 2 Bearing Race

14 4996933-001 1 Bearing, Needle Thrust

16 4997708-001 1 Dust Seal

REPLACEMENT PART NO. DESCRIPTION

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

990170-000 Centering Spring Kit - Low Torque (contains parts with **)

990252-000 Seal Kit - Standard Back Pressure (contains parts with **)

9900256-000 Seal Kit - High Back Pressure (contains parts with **)

9900321-000 Seal Kit - Viton, PM Gerotor(contains parts with **)

9900323-000 Seal Kit - Viton, Steel Gerotor(contains parts with **)

Table 1.0

Round and Square

Housing with Side Ports

ACTUAL DISPLAY REFERENCE NO. 4 GEROTOR REFERENCE NO. 29 CAP SCREW

cm3/r[in3/r]Part No. Width mm [in]Part No. Length mm [in]

31.5 [1.92] 4996815-001 7.45 [.290] 14543-003 35 [1.38]

39.5 [2.41] 4996815-002 9.3 [.366] 14543-003 35 [1.38]

50.8 [3.10] 4996815-003 8.3 [.326] 14543-003 35 [1.38]

63.1 [3.85] 4996815-004 10.2 [.400] 14543-003 35 [1.38]

73.8 [4.50] 4996815-005 12.1 [.476] 14543-002 40 [1.57]

100 [6.10] 4996815-006 16.3 [.642] 14543-004 45 [1.77]

120 [7.33] 4996815-007 19.5 [.768] 14543-004 45 [1.77]

Table 2.0

Gerotor

6 EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

O-ring

Seal

O-ring

Seal

Wear

Plate Drive

Gerotor

Seal

Ring

Manual Steering

Check/Relief Valve

O-ring

O-ring O-ring

End

Cap

Screw

(7)

Plug

Dust

Seal

Housing

Bearing Race (2)

Spool and Sleeve

Quad

Seal**

Thrust

Bearing

Round and

Square Housing

with Side Ports -

Disassembly

Cleanliness is extremely impor-

tant 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 disassembly, drain

the oil, then plug the ports and

thoroughly clean the exterior of

the SCU. During repairs, always

protect machined surfaces.

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.

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.

7. Remove the pin that holds

the spool and sleeve togeth-

er, 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 1

Figure 2

Port Face

Eaton Corp. Hydraulics Div.

Eden Prairie, MN 55344

A-273-008

SECTION

LOW TORQUE

D-D

Anti-CavitationValves

(located under these two cap screws)

Low Torque

7EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

Reassembly

Check all mating surfaces.

Replace any parts with scratch-

es 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 tow-

els 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 5 for seal kit

part numbers.

Important: During reassembly

lubricate the new seals with

a petroleum jelly such as

Vaseline®. Also lubricate

machined surfaces and bearings

with clean hydraulic fluid.

10. Install the quad seal

(see page 12 for 2-piece

seal installations):

• 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.

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 cen-

tering springs fit into the

notches in the sleeve.

15. Install the drive, be sure the

slot in the drive engages

the pin.

16. Install the pin

(see Figure 3).

17. Apply a light coating of

petroleum jelly to the

inner edge of the dust

and quad seals.

18. Put the thrust bearing and

races into the housing.

The thrust bearing goes

between the two races

(see Figure 2).

19. Apply a light coating of

clean hydraulic fluid to

the spool and sleeve assem-

bly and slide it

into the housing.

Important: Do not damage

the dust or quad seals..

20. Clamp the housing in a vise

as shown in Figure 5. Use

just enough clamping force

to hold the housing secure-

ly.

21. Lubricate and install a new

o-ring seal in the groove in

the housing.

22. 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.

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 end cap and seven

cap screws.Tighten cap

screws, in a crisscross pat-

tern, to 16 -18 Nm

[140 -160 lb-in].

28. Remove the SCU from

the vise.

29. 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].

Quad Seal

Dust Seal Thrust Bearing

and Race (2)

Round and

Square Housing

with Side Ports -

Reassembly

Figure 4

Figure 5

Standard Torque

Centering Springs

and Spacers

Sleeve

Spool

Spring

Retaining

Ring

Low Torque

Centering Springs

and Spacers

Figure 3

8 EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

Housing

Dust

Seal

Quad

Seal**

Thrust

Bearing

Sleeve

O-ring

Seal**

Bearing Race (2)

Spool

Centering

Springs*

O-ring

Seal

Wear

Plate Drive

Spring

Retaining

Ring*

O-ring**

Seal

Ring**

End

Cap

Cap Screw

Gerotor

Manual

Steering

Check/Relief

Valve

Plug

O-ring

Timing

Groove

Timing

Groove

Timing

Groove

Round Housing

with End Ports

ExplodedView

9EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

Round Housing

with End Ports

Parts List

ITEM NO. PART NO. QTY. DESCRIPTION REFERENCE PAGE

1 See Table 4.0 4 Cap Screw, Hex Head 10

2 4993924-XXX 1 Cap, End (Non-load sense, non-STConly)

4 See Table 4.0 1 Gerotor, Sub-assembly 10

5 4993805-001 1 WearPlate

6 4994693-001 1 Drive

9 22853-000 1 Drive Pin

13 4997396-001 2 Bearing Race

14 4996933-001 1 Bearing, Needle Thrust

16 4997708-001 1 Dust Seal

REPLACEMENT PART NO. DESCRIPTION

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

990170-000 Centering Spring Kit - Low Torque (contains parts with **)

990252-000 Seal Kit - Standard Back Pressure (contains parts with **)

9900256-000 Seal Kit - High Back Pressure (contains parts with **)

9900321-000 Seal Kit - Viton, PM Gerotor(contains parts with **)

9900323-000 Seal Kit - Viton, Steel Gerotor(contains parts with **)

Table 3.0

Round Housing with

End Ports

ACTUAL DISPLAY REFERENCE NO. 4 GEROTOR REFERENCE NO. 29 CAP SCREW

cm3/r[in3/r]Part No. Width mm [in]Part No. Length mm [in]

31.5 [1.92] 4998582-001 7.4 [.290] 4994536-045 44.9 [1.77]

39.5 [2.41] 4998582-002 9.3 [.366] 4994536-050 50.0 [1.97]

50.8 [3.10] 4998582-003 8.3 [.326] 4994536-045 44.9 [1.77]

63.1 [3.85] 4998582-004 10.2 [.400] 4994536-050 50.0 [1.97]

73.8 [4.50] 4998582-005 12.1 [.476] 4994536-050 50.0 [1.97]

100 [6.10] 4998582-006 16.3 [.642] 4994536-055 55.1 [2.17]

120 [7.33] 4998582-007 19.5 [.768] 4994536-060 59.9 [2.36]

Table 4.0

Gerotor

10 EATON Char-Lynn Power Steering Control Unit Series 5 Parts and Repair C-STCU-TS002-E1 November 2006

Housing

Dust

Seal Bearing Race (2)

Spool and

Sleeve

Quad

Seal**

Thrust

Bearing

Round Housing

with End Ports -

Disassembly

Cleanliness is extremely impor-

tant 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 disassembly, 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.

3. Slide the spool and

sleeve from the housing,

see figure 2.

4. Remove the thrust bearing

and bearing races.

5. Remove the seal.sembly

6. Using a small blade

screwdriver, carefully pry the

dust seal from the housing.

Important: Do not damage

the dust seal seat.

7. Remove the pin that holds

the spool and sleeve togeth-

er, 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 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

Timing

Groove

Timing

Groove

Timing

Groove

Timing

Groove

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