Shaft Seal Installation; Running-In - Toro Groundsmaster 580-D Service Manual

Check the shaft seal recess for scoring or damage that
could result in oil leakage around the outside diameter
of the shaft seal.
NOTE: Replacement shaft seals can be refitted with
Loctite hydraulic sealant to overcome slight damage to
this area.
3. Load Plates: The side faces which are against the
gears should be perfectly flat showing no signs of scor-
ing. Typically there are bright polished areas on this sur-
face caused by loading against the gear side faces. This
is often more noticeable on the low pressure side. The
load plates should be replaced if there is any general
scoring, fine scoring with a dull appearance, or tearing
of the surface material. Often there is an area where the
tips of the opposing gears have wiped an overlap with
a half moon shape. There must be no noticeable wear
step; it is critical that the load plate side face is complete-
ly flat to the gear side face. The load plate bearing liners
should not show any scoring or other damage. The gen-
eral outside area of the load plate should not show any
significant wear.
4. Gears: The gear faces should be examined for bruis-
ing or scoring. Operation with contaminated hydraulic
fluid will often show scoring between the root of the gear
and the journal that leaves a wear step. If a wear step
can be felt, along the root diameter, by drawing a sharp
pointed tool across the surface from the journal out-
wards toward the tip of the gear, then the gear is unser-
viceable and the motor should be replaced.
The gear teeth should be carefully examined for bruising
or pitting.
The journal bearing surfaces should be completely free
from scoring or bruising. The surface should appear
highly polished and smooth to the touch.
Examine the area where the shaft seal lips run on the dri-
veshaft, this shows up as a polished ring or rings. If a no-
ticeable groove can be felt or there is scoring, the shaft
is unserviceable and the motor should be replaced.
Reassembly
NOTE: Install new seals when reassembling the motor.
Use petroleum jelly to hold seals and O-rings in place
during assembly.
1. Install new load seals (7) on the load plate (4) you
marked "B". Install load plate (4) into body.
PTO System Repairs
2. Put body on work bench so gear openings face up.
3. Install gears into their original positions in the body.
NOTE: Install gear with driveshaft into the side of the
body you marked in step 1 under Disassembly.
4. Install new load seals (7) on the load plate (4) you
marked "F". Install load plate into mounting flange.
5. Install new O-ring seal (6) in mounting flange.
6. Install mounting flange over drive shaft and onto the
body.
7. Install washers (2) and nuts (1). Tighten nuts evenly
in a crossing pattern to a torque of 70 + ft--lb.
8. Install shaft seal.

Shaft Seal Installation

1. Apply grease to seal bore in mounting flange. NOTE:
If using Loctite hydraulic sealant to overcome slight
damage to the seal bore area, do not apply grease.
2. Pack lips of new shaft seal (3) with high melting point
grease.
3. Install Mylar sleeve from seal kit onto drive shaft,
checking to make sure that the sleeve covers all sharp
edges of the shaft.
4. Slide new shaft seal onto shaft down to flange housing
with the exposed spring side of the seal facing the motor.
5. Press the shaft seal in until it bottoms squarely in the
bore.
6. Put on protective eyewear, such as safety glasses or
a face shield, then install the retaining ring (6).
Running- -in
A motor which has been rebuilt with new load plates,
must be run-in before it is subjected to full load condi-
tions. Ideally this should be done on a test stand where
pressure can be gradually applied. If a test stand is not
available, install the motor on the machine and operate
the cutting deck at low speed with no load for at least one
minute. Gradually increase speed, running for one min-
ute at a time at each speed until you reach full engine
RPM. Stop the machine and check to make sure the mo-
tor is not running hotter than the others.
Rev. A
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Groundsmaster 580-D