Tennant ATLV 4300 Service Manual page 166

Power Steering
2 Series
Steering Control Units
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.
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 pressur-
ized 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 parts list 6-323
for seal kit part numbers, replacement parts, and
ordering information.
Important: During reassembly lubricate the new seals
with a petroleum jelly such as Vaseline
machined surfaces and bearings with clean hydraulic
fluid.
4
Centering
Springs and
Spacers
Spring
Retaining
Ring
® . Also lubricate
Sleeve
Pin
Spool
Figure 3
9 Remove the retaining ring and springs.
Caution: The centering springs are under tension. Remove
the retaining ring carefully.
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.