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
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
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
13
14
A-273-008
SECTION
LOW TORQUE
D-D
12
Anti-Cavitation Valves
(located under these two cap screws)
Low Torque
