4.
sembly (4) from motor housing.
Remove motor from vise and remove rotating as-
2. Ifnecessary,install new needle bearing (17) inhous-
ing (3) with numbered end of the bearing outward.
5.
caution not to mar the finish that makes contact with pis-
tons.
Remove the camplate insert (5) from housing. Use
3. Install retaining ring (9) on shaft. Install thrust race
(10), thrust bearing (13), and second thrust race (10).
Secure with second retaining ring (9).
6.
from housing and remove shaft seal (8) and washer
(18).
Remove retaining ring (6) from housing. Press shaft
4. Installshaftinhousing.Installwasher(18),newshaft
seal (8), and retaining ring (6).
5.
Install camplate insert (5) with the lettering side of in-
7.
thrust races (10) and thrust bearing (13).
Remove retaining rings (9) from shaft and remove
sert to the front of the housing. Use petroleum jelly to
hold in place during assembly.
8.
new items upon reassembly.
Discard the shaft seal and o--ring, and replace with
6. Install rotating assembly (4) into housing. Make sure
thatpistonshoes makecontactwiththecamplateinsert.
Inspection
7. Clamp motor assembly in a protected jaw vise with
the open end of the housing up.
1.
Check the condition of the needle bearing (16) in
backplate (2) and replace if necessary.
8. If roll pins were removed, install to dimension shown
in Figure 65 and with opening of roll pin oriented away
from bearing within 5 degrees of bearing center line.
2.
Inspectvalveplate(12)onthebronzesidenexttothe
piston block for wear. A smooth surface is required. Do
not lap valve plate bronze surface. Replace valve
plate if any wear exists.
9. To replace bearing (16) in backplate (2). Press bear-
ing down to the dimension shown (Fig. 65) protruding
from backplate with numbered end of bearing facing up
next to valve plate.
3.
withvalveplate.Thissurfaceshould besmooth andfree
Inspect the piston block surface that makes contact
of deep scratches. Do not lap piston block.
.173
in (4.39 mm)
Roll Pin (15)
.090
in (2.3 mm)
4.
The pistons should move freely in the piston block
Bearing
bore. If they are sticky in the bore, examine the bore for
scoring or contamination.
5.
Examine the O.D. of the pistons for finish condition.
They should not show wear or deep scratches. Inspect
the shoes for a snug fit on the ball end of the pistons and
aflatsmoothsurfacethatcomesincontactwiththecam-
plate. Do not lap piston shoes.
6.
Examine the spider for wear in the pivot area.
7.
no signs of wear.
Examine the spider pivot to insure smoothness and
Figure 65
small amount of petroleum jelly to the steel
side of valve plate (12) to hold in place for installation.
Place the valve plate in position onto the backplate (2),
with steel side against backplate, bronze colored side
against piston block.
10.Apply
8.
plate insert (5) should show no signs of scoring.
The polished finish on the shoe surface of the cam-
9.
Inspect the shaft for wear in the seal, bearing and
spline areas.
thrust bearing (13) and races (10) for wear.
Check the condition of the needle bearing (17) in
10.Inspect
11.Placing new o--ring (11) onto backplate, install back-
plate assembly (2) onto housing assembly. Make sure
valve plate stays in position.
11.
housing and replace if necessary.
12.Insert
cap screws and torque from 15 to 18 ft--Ib (20
to 24 N--m) in a criss--cross pattern.
Reassembly (Fig. 64)
1.
ternal parts with clean hydraulic oil before reassembly.
Clean all parts in suitable solvent and lubricate all in-
13.Fill case half full of new hydraulic oil.
Groundsmaster 4100--D
Page 4 -- 83
Hydraulic System
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