Toro 74206, 74208, 74202, 74203, 74204 Service Manual

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Toro 74206, 74208, 74202, 74203, 74204 Service Manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Spindle Repair Module

1

Z Master 200 Series

1.Stop the engine, remove the key, and engage the parking brake.

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.

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.

Zerk

Nut

Hardened Washer

Pulley

Seal

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

Spring Washer

Blade Bolt

Spindle Repair Module

3

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.

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.

Inspect the bearings as follows:

A.Look for the presence of grease, particularly in the upper bearing. Dry or cooked grease indicates a lack of maintenance

B.Look for dirt in the grease. This indicates a bad seal or worn lower bearing spacer. If the unit was recently

Zerk

Nut

Hardened Washer

Pulley

Seal

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

Spring Washer

Blade Bolt

4

Spindle Repair Module

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.

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 bearings, 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.

Zerk

Nut

Hardened Washer

Pulley

Seal

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

Spring Washer

Blade Bolt

Spindle Repair Module

5

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