9.
tering springs and spring retaining ring will stay with the
spool as it is removed.
Carefully slide the spool out of the sleeve. The cen-
7. Apply a light coating of petroleum jelly to the inner
edge of the dust and quad seals.
8.
Put the thrust bearing and races into the housing.
The thrust bearing goes between the two races
(Fig. 49B).
CAUTION
IMPORTANT: Do not damage the dust or quad seals
when installing the spool and sleeve assembly.
The centering springs are under tension. Re-
move the retaining ring carefully.
9.
Apply a light coating of clean hydraulic fluid to the
spool and sleeve assembly and slide carefully the as-
sembly into the housing.
10.Remove
springs from the spool.
the spring retaining ring and centering
10.Clamp
ing force to hold the housing securely.
thehousinginavise.Useonlyenoughclamp-
Reassembly (Fig. 49A)
Check all mating surfaces. Replace any parts with
scratches or burrs that could cause leakage. Wash all
metalpartsinclean solvent.Blow themdry withpressur-
ized air. Do not wipe parts dry with paper towels or cloth.
Lint in a hydraulic system will cause damage.
11.
in the housing.
Lubricate and install a new o-ring seal in the groove
12.Install
wear plate with threaded holes in the housing.
the wear plate and align screw holes in the
NOTE: Always use new seals and o--rings when
reassembling the steering control unit.
NOTE: The holes in the wear plate are symmetrical.
13.Install
drive engages the pin.
the geroter drive, making sure the slot in the
IMPORTANT: During reassembly, lubricate the new
seals with petroleum jelly. Also, lubricate machined
surfaces and bearings with clean hydraulic fluid.
14.Lubricate
and install new o-ring inwear plate groove.
1.
Install the quad seal:
15.Install
the gerotor and align the screw holes.
A. Put one of the bearing races and sleeve into the
housing.
16.Lubricate
groove.
and install new o-ring in gerotor ring
and install new o-ring and sealring ingero-
B. Together, the housing and bearing race create a
groove into which the quad seal will be installed.
17.Lubricate
tor star groove.
C. Hold the bearing race tightly against the input end
of the housing by pushing on the gerotor end of the
sleeve.
18.Install
the spacer.
19.Install the end cap and seven cap screws. Tighten
the cap screws, in a crossing pattern, from 140 to 160
in-lb (16 to 18 N--m).
D. Fitthequadsealintoitsseatthroughtheinputend
of the housing. Be sure the seal is not twisted.
20.Remove
the steering control unit from the vise.
E. Remove the sleeve and bearing race.
Lubricate and install the dust seal.
21.Install
the relief valve and plug. Tighten the plug to
2.
3.
150
in-lb (17 N--m).
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.
Thrust Bearing
and Race (2)
Dust Seal
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 centering
springs fit into the notches in the sleeve.
Quad Seal
6.
Install the pin.
Figure 49B
Steering System Repairs
Page 4 -- 54.2 Rev. E
Groundsmaster 580--D
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| Document Type | Service Manual |
| Language | English |
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