Disassembly
(3), thrust race (12), thrust bearing (13), second thrust
race (12), and second retaining ring (3) from drive shaft
(21).
Work in a clean area as cleanliness is extremely impor-
tant when repairing hydraulic pumps. Thoroughly clean
the outside of pump. After cleaning, remove port plugs
and drain oil from pump.
12.Remove the two cap screws (42) that secure cradle
sub--assemblyinside housing. Movethe cradle sub--as-
sembly back--and--forth to release dowel bushings (40)
and remove cradle sub--assembly from housing.
1.
Position the pump into a protected jaw vise, clamp-
ing onto the outer portion of the flange, with the cap
screws up. Mark the relationship of the working ports
(for reassembly identification) to the servo control as-
sembly with a scribe. Remove the four cap screws (15)
retaining backplate (20).
13.Remove button head cap screw (43) to remove
bushing (44) from cradle.
14.Remove
15.Discard
remaining plugs from housing.
the shaft seal (25), gaskets (32, 33, 34), and
2.
housing (19). Remove valve plate (18) from backplate
Lift backplate (20) straight up off drive shaft (21) and
o--rings from all assemblies. Replace with new seals
upon reassembly.
(20)
or from rotating kit assembly (6), still in housing
(19).
Inspection
3.
From backplate (20), remove bypass valve (14), for-
1.
Inspect backplate assembly:
wardreliefvalve (26) andreverse relief valve (16).Note:
Mark the valves in relationship to the cavity it was re-
moved, for reassembly purposes.
A. Check the bearing (45) (press fit) in backplate
(20).
If needles remain in cage, move freely, and set-
ting is at the dimension shown in Figure 58, bearing
removal is not required.
4.
backplate (20).
Remove housing gasket (32) from housing (19) or
B. Check roll pin (38) in backplate (20). If tight and
settothedimension shown inFigure 58,removal not
required.
5.
With pump still in vise, remove the six socket head
screws (17) retaining the servo control assembly (28).
Remove the control assembly and control housing gas-
ket (34) from the housing. Remove orifice plates (30),
noting location for reassembly. Remove nut (22), lock
washer (23), and control arm (27) from servo control in-
put shaft. Note position of control arm for reassembly.
Numbered end
.090
inch
.173 inch
(4.39 mm)
6.
To remove rotating kit assembly (6) from housing,
(2.29 mm)
first remove pump from vise holding the rotating kit as-
sembly in position. Lower pump so that the shaft end
(flange end) isup.Setthe rearofhousing onto tablewith
housing flat and rotating kit assembly at rest on table.
(Hole in table, for protruding shaft, is required.) Lift and
remove the housing (19) and drive shaft (21) from rotat-
ing kit assembly (6) and camplate assembly(11).
Figure 58
2.
Check the bearing (39) (press fit) in pump housing
If needles remain in cage, move freely, and setting
at the dimension shown in Figure 59, bearing removal
is not required.
(19).
7.
and servo piston follower (8) from camplate (11).
Remove camplate (11)from rotating kit assembly (6)
8.
ers (31) retaining each cover plate (9 & 10).
Remove the four socket head screws (5) and wash-
Flange end of housing
Numbered end
9.
(4).
Remove jam nut (1), washer (29), and seal washer
Hold the servo piston bolt with hex key and unscrew
.070
(1.78
inch
mm)
cover plate (10) from bolt.
10.Remove
servopistonassembly (7)andsealsub--as-
semblies (two sets) (37) from housing. Note: Disassem-
bly of servo piston assembly is not required.
11.
Remove retaining ring (2) from the front of pump
housing (19). Press the drive shaft (21), shaft seal (25),
and washer (24) from housing. Remove retaining ring
Figure 59
Hydraulic System (Rev. A)
Groundsmaster 4500--D/4700--D
Page 4 -- 65
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
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