4
EATON Char-Lynn
Power Steering, Steering Control Units 001, 5 Series C-STCU-TS002-E August 2003
Standard Torque
Centering Springs
and Spacers
Sleeve
Pin
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
