3.
4.
Inspect camplate assembly:
3
A. Thefinishonthepistonshoesurfacesofthecam-
plate (11) should show no signs of scoring.
2
1
B. Inspect camplate (11) bushing surface for wear.
Also inspect surface for coating transfer from bush-
ing.
4
Inspect bushing (44) for contamination embedment
5
within coating of bushing surface coming in contact with
camplate (11).
Figure 60
4.
5.
5.
Inspect rotating kit (Fig. 60):
1.
2.
3.
Piston assemblies
Spider
Spider pivot
Piston block
Retainer
A. The pistons should move freely in the rotating kit
piston block bore. If they are sticky in the bore, ex-
amine the bore for scoring or contamination.
.500
(12.7
inch
mm)
B. Examine the O.D. of the pistons for finish condi-
tion. They should not show wear or deep scratches.
Inspect the shoes for a snug fit on the ball end of the
pistons and a flat smooth surface that comes in con-
tact with the camplate. Do not lap piston shoes.
Right Side
Left Side
C. Examine the spider for wear in the pivot area.
D. Examine the spider pivot to insure smoothness
and no signs of wear.
Front flange -- Drive shaft end of pump
Adjust to center piston
Install servo piston
in this direction
Reassembly
1.
lubricated with clean hydraulic oil before reassembly.
All parts should be cleaned and internal pump parts
Figure 61
5.
(1)
Install new sealwasher (4),washer (29),and jamnut
to servo piston bolt. Holding servo piston bolt with
2.
to dimension shown in Figure 59 with the numbered end
of bearing outward.
If necessary, press new bearing into pump housing
hexkeywrench,torquejamnutfrom150to160in--lb(17
to 18 N--m). Check the centering of servo piston assem-
bly (7). Install new cover plate gasket (33) and cover
plate (9) to open side of servo piston and retain with four
washers (31) and socket head screws (5). Torque
screws from 40 to 48 in--lb (4.5 to 5.4 N--m).
3.
servo piston cavity of pump housing (19).
Installthetwonewsealsub--assemblies(37)intothe
4.
Screw the cover plate (10) onto the servo piston as-
sembly (7). Install new cover plate gasket (33) in place
on pump housing. Install servo piston assembly (7) and
cover plate (10) into servo piston bore in right side of
housing (Fig. 61). Retain cover plate with four washers
6.
bushing (44) onto cradle with button head cap screw
(43).
(1.6
Press dowel bushings (40) into cradle and secure
Torque button head cap screw from 14 to 16 in--lb
to 1.8 N--m).
(31)
andsocketheadscrews (5).Torquescrews from40
to 48 in--lb (4.5 to 5.4 N--m). To obtain neutral, centering
the servo piston assembly is required. Measure in from
the left side and set servo piston .500” (12.7 mm) from
surface of housing servo bore as shown in Figure 61.
7.
Place cradle sub--assembly (41) into housing (19)
making sure dowel bushings (40) and cradle (41) are
completely seated into housing. Retain cradle sub--as-
sembly with two cap screws (42) after applying Loctite
#277
screws from 25 to 28 ft--lb (34 to 38 N--m).
(or equivalent) to the end of threads. Torque cap
NOTE: Re--adjustment may be required for neutral at
unit start--up.
Hydraulic System (Rev. A)
Page 4 -- 66
Groundsmaster 4500--D/4700--D
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| Document Type | Service Manual |
| Language | English |
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