Disassembly
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
remaining plugs from housing.
2.
housing (19). Remove valve plate (18) from backplate
(20)
(19).
Lift backplate (20) straight up off drive shaft (21) and
15.Discard
o--rings from all assemblies. Replace with new seals
upon reassembly.
the shaft seal (25), gaskets (32, 33, 34), and
or from rotating kit assembly (6), still in housing
Inspection
3.
From backplate (20), remove bypass valve (14), for-
ward relief valve (26), and reverse relief valve (16).
Note: Mark the valves in relationship to the cavity it was
removed, for reassembly purposes.
1.
Inspect backplate assembly:
A. Check the bearing (45) (press fit) in backplate
(20).
ting is at the dimension shown in Figure 43, bearing
removal is not required.
If needles remain in cage, move freely, and set-
4.
backplate (20).
Remove housing gasket (32) from housing (19) or
5.
With pump still in vise, remove the six socket head
B. Check roll pin (38) in backplate (20). If tight and
settothedimension shown inFigure 43,removal not
required.
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
6.
To remove rotating kit assembly (6) from housing,
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).
.090
(2.29
inch
mm)
.173 inch
(4.39 mm)
Figure 43
2.
(19).
at the dimension shown in Figure 44, bearing removal
is not required.
Check the bearing (39) (press fit) in pump housing
If needles remain in cage, move freely, and setting
7.
and servo piston follower (8) from camplate (11).
Remove camplate (11)from rotating kit assembly (6)
8.
Remove the four socket head screws (5) and wash-
ers (31) retaining each cover plate (9 & 10).
9.
(4).
Remove jam nut (1), washer (29), and seal washer
Hold the servo piston bolt with hex key and unscrew
Flange end of housing
Numbered end
cover plate (10) from bolt.
10.Remove
semblies (two sets) (37) from housing. Note: Disassem-
bly of servo piston assembly is not required.
servopistonassembly (7)andsealsub--as-
.070 inch
(1.78
mm)
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
(3),
thrust race (12), thrust bearing (13), second thrust
race (12), and second retaining ring (3) from drive shaft
(21).
Figure 44
Groundsmaster 4000--D
Page 4 -- 61
Hydraulic System (Rev. B)
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Groundsmaster 4000 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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