Toro 74206, 74208, 74202, 74203, 74204 Service Manual
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Spindle Repair Module 1
Z Master 200 Series
1. Stop the engine, remove the key, and
engage the parking brake.
Zerk
2. Remove covers from the cutting unit.
3. Using a floor jack raise the machine until
you can access the underside of the cutting unit.
4. Support the machine using a properly
rated jack stand.
5. Inspect the assembly before removing.
Look for the following:
A. Bent or damaged blade.
B. Missing or unused grease zerk.
C. String, wire, rope, etc. wrapped
around the spindle under the deck.
6. Remove the drive belt(s) from the pulley.
Consult the machine owner's manual for
this procedure.
7. Remove the nut and washer retaining the
spindle pulley. Then remove the pulley
from the shaft.
Nut
Hardened Washer
Pulley
Seal
Spindle
Housing
Bearing Cone
Bearing Cup
Large Spacer
Small Spacer
Machine “C” Spacer
8. Unbolt the spindle housing from the deck.
Place spindle assembly on a bench or in a
vise and remove the blade.
9. Remove the spindle shaft from the spindle
housing; it may need to be pressed out of
the housing.
Note: The lower bearing spacer will remain
on the spindle shaft.
10. Inspect the spindle shaft for the
following:
A. Elongated grease axis hole. Normally
this hole is perfectly round, if it is
deformed it is directly a result of
impact.
B. Damaged splines - If the splines are
twisted, it is a sign of impact. If they
are worn, it's an indication that the
assembly was running with the pulley
loose.
Bearing Cup
Spindle Shaft
Blade
Spring Washer
Snap Ring
Bearing Cone
Seal
Bearing Spacer
Grease Axis Hole
Blade Bolt
3Spindle Repair Module
Z Master 200 Series
C. Damaged shaft - When the shaft is
worn at the point where the upper
bearing is located in the assembly, it
is a result of the assembly running
loose.
There are two causes for this:
1. Improper torque on the pulley retention nut. This allows individual components of the assembly to move
and wear against other components.
2. Impacts cause the shaft to stretch,
which will lessen the clamp load and
cause the assembly to wear as if
the nut did not have proper torque.
Zerk
Nut
Hardened Washer
Pulley
Seal
11. Remove the seals, note the direction of the
seals, this will be important during reassembly. The upper seal faces inward,
and the lower seal faces outward. If the
lower seal is installed incorrectly, the lower
bearing spacer will crush the seal and
allow dirt into the assembly, causing bearing failure to occur.
12. Remove the bearings and the two small
diameter spacers from the housing. One of
the two spacers removed will look like a
"C" slip and the other will be a thicker
spacer with a hole in it. The open side on
the “C” shaped spacer, in addition to the
lubrication hole in the thicker spacer,
allows grease to pass from the spindle
shaft to the bearings.
Note: When removing the bearings, mark or
isolate the top bearing from the lower
bearing. This will allow the bearings to
be installed in their original operating
position. Failure to do this may cause
premature bearing failure when
reassembled.
Spindle
Housing
Bearing Cone
Bearing Cup
Large Spacer
Small Spacer
Machine “C” Spacer
Snap Ring
Bearing Cup
Bearing Cone
Seal
Bearing Spacer
Spindle Shaft
Grease Axis Hole
Blade
Inspect the bearings as follows:
A. Look for the presence of grease, par-
ticularly in the upper bearing. Dry or
cooked grease indicates a lack of
maintenance
B. Look for dirt in the grease. This indi-
cates a bad seal or worn lower bearing spacer. If the unit was recently
4 Spindle Repair Module
Spring Washer
Blade Bolt
Z Master 200 Series
rebuilt, look for proper installation of
the lower seal.
C. Clean the bearings and look for any
pitting or flaking on the rollers.
D. Roll the clean bearings in your hand
and feel for rough spots. If the bearing catches or the rollers get stuck in
the cage, replace the bearing.
Note: With this spindle design, both bearings
and bearing cups must be replaced as
a set. Even if only one of the two bearings is damaged.
13. If replacing the bearings, use a punch and
hammer to drive both of the bearing cups
out of the spindle housing. Also, remove
the large diameter spacer at this time.
Caution: Do not use old bearing cups with
new bearings. This may cause premature bearing wear and result in
failure.
Zerk
Nut
Hardened Washer
Pulley
Seal
Spindle
Housing
Bearing Cone
Bearing Cup
14. A large snap ring is still inside the spindle
housing. It locates the matched bearing
set in the bore of the spindle housing.
There is no need to remove and replace
this snap ring.
Assembly
15. Thoroughly clean and inspect the parts
prior to assembly:
A. Spindle shaft for bearing surface
damage or signs of impact. Also
check for damage to the threaded
areas for both the blade bolt and the
pulley retention nut.
B. Bottom bearing spacer for wear. If
the spacer is damaged the seal may
not be able to keep dirt out properly.
C. Bearings for wear. If reusing bear-
ings, you must examine them carefully for wear. Also, make sure to put
the same bearing and bearing saddle
together as they were. As noted
above, look for pitting on the rollers
of the bearings and replace the bearing set if any pitting is present.
Large Spacer
Machine “C” Spacer
Bearing Cup
Seal
Spindle Shaft
Blade
Spring Washer
Small Spacer
Snap Ring
Bearing Cone
Bearing Spacer
Grease Axis Hole
Blade Bolt
5Spindle Repair Module
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