Simplicity AGCO Allis 2000 Series, Service & Repair Manual

Page: 310 / 312

20 Power Steering Unit Service
Reassembly
20 - 6
Centering
Springs and
Spacers
Spring
Retaining
Ring
Spool
Pin
Sleeve
IMPORTANT: During reassembly lubricate the new
seals with a petroleum jelly like Vaseline. Also
lubricate machined surfaces and bearings with
clean hydraulic fluid.
1. Install the quad seal; do the following steps.
• 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.
2. Lubricate and install the dust seal, see figure 8 for
correct seal orientation.
3. 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.
4. Fit the retaining ring over the centering springs.
5. Apply a light coating of clean hydraulic fluid to the
spool and slide it into the sleeve. Be sure the center-
ing springs fit into the notches in the sleeve.
6. Install the pin, see figure 7.
7. Apply a light coating of petroleum jelly to the inner
edge of the dust and quad seals.
Figure 7. Disassembling Spool and Sleeve
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.
Lint in a hydraulic system will cause damage.
NOTE: Always use new seals when reassembling
hydraulic steering control units. Refer to parts list for seal
kit part numbers, replacement parts, and ordering infor-
mation.
CAUTION
The centering springs are under tension; remove
the retaining ring carefully.
7. Remove the pin that holds the spool and sleeve
together, see figure 7.
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.
Not
for
Reproduction