Toro Groundsmaster 580-D Service Manual page 200

4. Inspect drive shaft gear and idler gear (Fig. 39C):
A. Drive shaft spline should be free of twisted or bro-
ken teeth.
B. Gear shafts should be free of rough surfaces and
excessive wear at bushing points and sealing areas.
Scoring, rough surfaces or wear on gear shafts indi-
cates need for replacement.
C. Gear teeth should be free of excessive scoring
and wear. Any broken or nicked gear teeth must be
replaced.
D. Inspect gear face edge for sharpness. Sharp
edges of gears will mill into wear plates and, thus,
must be replaced.
Assembly
Note: When assembling the pump, check the marker
or scribe marks on each part to make sure that parts are
properly aligned during assembly (Fig. 39B).
1. Lubricate new sealing rings, pre--load seal and load
seal with a thin coat of petroleum jelly. Lubricate all other
internal parts freely with clean hydraulic oil.
2. Install new shaft seal in front body. Seal should be
pressed into place until it reaches the bottom of the bore.
Grease seal lip.
3. Place rear cover on a flat surface.
4. Install the sealing ring into the rear cover groove. Fol-
low by placing the rear wear plate on the cover. Make
sure to position the wear plate as shown in Figure 39A
with the bronze side toward the gear position. Lubricate
the exposed side of the rear wear plate with clean hy-
draulic oil.
5. Lubricate the drive shaft and idler gear with clean hy-
draulic oil and install the gears into the proper bearings
in the rear cover. Make sure to align the gears using
mark placed during disassembly.
6. Install locating dowels in rear cover.
7. Carefully install gear plate making sure to align
scribe marks on the gear plate and rear cover.
8. Lubricate bronze side of front wear plate with clean
hydraulic oil. Place the front wear plate on the drive shaft
and idler gear. Make sure to position the wear plate as
shown in Figure 39A with the bronze side toward the
gears.
9. Install new pre--load seal, load seal and sealing ring
to the front body.
Auxiliary (Lift/Counterbalance) System Repairs
SCRIBE MARK
1
1. Gear shaft spline
2. Gear shaft
IMPORTANT: To prevent shaft seal damage during
assembly, use seal protector or tape on drive shaft
splines.
10.Gently slide the front body onto the assembly. Make
sure to align scribe marks on the front body and gear
plate. Firm hand pressure should be sufficient to engage
the dowels.
11. Check to make sure that pump component surfaces
are flush. If gaps exist between components, check as-
sembly for a shifted seal or sealing ring. Correct before
proceeding.
12.Install cap screws and hand tighten to secure as-
sembly.
13.Place mounting flange of the pump into a vise and al-
ternately torque the screws from 360 to 380 in--lbs (40.7
to 42.9 N--m).
14.Remove pump from vise.
15.Place a small amount of clean hydraulic oil in the inlet
of the pump and rotate the drive shaft one revolution. If
any binding is noted, disassemble the pump and check
for assembly problems.
Page 4 - - 44.2
Rev. E
Figure 39B
3
2
4
Figure 39C
3. Gear teeth
4. Gear face edge
Groundsmaster 580--D