Eaton Char-Lynn, 5 Series User Manual
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
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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, inspection and reassembly of the control 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 thoroughly 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 accuracy 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
Exploded View..........................................................................................................................................................................................8
Parts List..................................................................................................................................................................................................9
Disassembly ..........................................................................................................................................................................................10
Reassembly............................................................................................................................................................................................11
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
• T orque Wrench
(31 Nm [275 lb-in] Capacity)
• Small Blade Screwdriver
Special T ools:
• Plunger and Sleeve Tool (twopiece seal) No. 600801-0 01*
* 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
Round and
Square Housing
with Side Ports
Exploded View
*Round housing shown,
but applies to square
housing also.
Low Torque
Centering Springs*
Dust
Seal
Standard Torque
Centering Springs*
Sleeve
Housing
Manual Steering
Relief Valve
Wear
Plate
O-ring
Seal**
Quad
Seal**
O-ring**
O-ring**
Plug
Drive
Thrust
Bearing
Check
Ball
Bearing
Race (2)
O-ring**
Plug
Pin
Spool
Spring
Retaining
Ring*
Gerotor
O-ring**
Seal
Ring**
O-ring
Seal**
Cap
Screw
(7)
End
Cap
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 Wear Plate
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
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