8.
The thrust bearing goes between the two races
(Fig. 90).
Put the thrust bearing and races into the housing.
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.
spool and sleeve assembly and slide carefully the as-
sembly into the housing.
Apply a light coating of clean hydraulic fluid to the
10.Remove
springs from the spool.
the spring retaining ring and centering
Reassembly
10.Clamp
thehousinginavise.Useonlyenoughclamp-
ing force to hold the housing securely.
Check all mating surfaces. Replace any parts with
scratches or burrs that could cause leakage. Wash all
metalpartsincleansolvent.Blowthemdrywithpressur-
ized air. Do not wipe parts dry with paper towels or cloth.
Lint in a hydraulic system will cause damage.
11.
Lubricate and install a new o-ring seal in the groove
in the housing.
12.Install
the wear plate and align screw holes in the
wear plate with threaded holes in the housing.
NOTE: Always use new seals and o--rings when
reassembling the steering control unit.
NOTE: The holes in the wear plate are symmetrical.
IMPORTANT: During reassembly, lubricate the new
seals with petroleum jelly. Also, lubricate machined
surfaces and bearings with clean hydraulic fluid.
13.Install
drive engages the pin.
the geroter drive, making sure the slot in the
14.Lubricate
andinstallnewo-ringinwearplategroove.
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
andinstallnewo-ringandsealringingero-
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 cap screws, in a crossing pattern, from 140 to 160
in-lb (16 to 18 N--m).
the end cap and seven cap screws. Tighten
D. Fitthequadsealintoitsseatthroughtheinputend
of the housing. Be sure the seal is not twisted.
E. Remove the sleeve and bearing race.
Lubricate and install the dust seal.
20.Remove
the steering control unit from the vise.
2.
3.
21.Install
the relief valve and plug. Tighten the plug to
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)
4.
5.
Fit the retaining ring over the centering springs.
Apply a light coating of clean hydraulic fluid to the
Dust Seal
spool and slide it into the sleeve. Be sure the centering
springs fit into the notches in the sleeve.
Quad Seal
6.
7.
Install the pin.
Figure 90
Apply a light coating of petroleum jelly to the inner
edge of the dust and quad seals.
Groundsmaster 4500--D/4700--D
Page 4 -- 105
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
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