72in Mower

This product is capable of amputating hands and feet and of throwing objects. Always follow all safety instructions to avoid serious personal injury.

Using this product for purposes other than its intended use could prove dangerous to you and bystanders.

• Read and understand the contents of this Operator’s Manual before starting the engine.

• Use your full attention while operating the machine. Do not engage in any activity that causes distractions; otherwise, injury or property damage may occur.

• Do not put your hands or feet near moving components of the machine.

• Do not operate the machine without all guards and other safety protective devices in place and working on the machine.

• Keep clear of any discharge opening. Keep bystanders and pets a safe distance away from the machine.

• Keep children out of the operating area. Never allow children to operate the machine.

• Park the machine on a level surface, lower the cutting units, disengage the drives, engage the parking brake (if provided), shut off the engine, and remove the key before leaving the operator's position for any reason.

Improperly using or maintaining this machine can result in injury. To reduce the potential for injury, comply with these safety instructions and always pay attention to the safety-alert symbol, which means Caution, Warning, or Danger—personal safety instruction. Failure to comply with these instructions may result in personal injury or death.

You can find additional safety information where needed throughout this Operator’s Manual.

1. Remove the cable tie securing the grass deflector to the top of the cutting unit and lower the deflector.

2. Place the left J-hook end of the spring around the cutting unit edge

3. Place the right J-hook end of the spring around the grass deflector (Figure 3).

   Important: You must be able to lower the grass deflector into position. Lift the deflector up to ensure that it lowers into the full down position.

   

   Figure 3

   1. Grass deflector
   2. Spring
   3. Place the right J-hook end of the spring around the deflector.
   4. Place the left J-hook end of the spring behind the cutting unit edge.
   5. Spring installed

Parts needed for this procedure:

1. On 1 side of the traction unit, loosen (but do not remove) the wheel nuts securing the wheel and tire assembly to the front wheel studs.

2. Jack up the machine until the front wheel is off the floor. Use jack stands or block the machine to prevent it from accidentally falling.

3. Remove the wheel nuts and slide the wheel and tire assembly off of the studs.

4. Remove the lift arms from the pallet.

5. Remove the pivot pin and cotter pin from each lift arm.

6. Mount a lift arm to the pivot bracket with a pivot pin and a cotter pin (Figure 4). Mount the lift arm with the bend positioned outward.

7. Hook the brake return spring to the tab on the lift arm (Figure 4).

   

   Figure 4

   1. Pivot pin
   2. Lift arm
   3. Pivot bracket
   4. Brake return spring
   5. Tab

8. Install the wheel and tire assembly. Torque the wheel nuts to 102 to 108 N∙m (75 to 80 ft-lb).

9. Repeat the procedure on the opposite side of the machine.

1. Remove the 2 thrust washers, clevis pin and hairpin cotter from each castor arm bracket on the cutting unit (Figure 5).

2. Move the cutting unit into position in front of the traction unit.

3. Press the lift switch forward to the FLOAT position. Push a lift arm down until the holes in the lift arm line up with the holes in the castor arm bracket (Figure 5).

   

   Figure 5

   1. Castor arm bracket
   2. Hairpin cotter
   3. Clevis pin
   4. Lift arm
   5. Thrust washer

4. Secure the lift arm to the castor arm with the 2 thrust washers, a clevis pin and a hairpin cotter.

   Position the thrust washers between the lift arm and the castor arm bracket (Figure 5) and insert end of cotter pin into the slot in the castor arm tab to retain cotter pin.

5. Repeat the procedure on the opposite lift arm.

6. Start the traction unit and raise the cutting unit.

1. Slide the male PTO shaft into the female PTO shaft, align the mounting holes in the gear case input shaft with the holes in the PTO shaft, and slide them together.

   

   Figure 6

   1. PTO shaft
   2. Bolts and locknuts
   3. Gear case
   4. Roll pin

2. Secure them with a roll pin.

3. Tighten the bolts and nuts.

Before operating the machine, it must be greased to ensure proper lubricating characteristics; refer to Lubrication. Failure to properly grease the machine will result in premature failure of critical parts.

A selection of Toro approved attachments and accessories is available for use with the machine to enhance and expand its capabilities. Contact your Authorized Service Dealer or Distributor or go to www.Toro.com for a list of all approved attachments and accessories.

To ensure optimum performance and continued safety certification of the machine, use only genuine Toro replacement parts and accessories. Replacement parts and accessories made by other manufacturers could be dangerous, and such use could void the product warranty.

The height-of-cut is adjustable from 25 to 127 mm (1 to 5 inches) in 13 mm (1/2 inch) increments. To adjust the height-of-cut, position the castor wheel axles in the upper or lower holes of the castor forks and add or remove an equal number of spacers from the castor forks.

1. Start the engine and raise the cutting unit off the floor so that the height-of-cut can be changed. Shut off the engine and remove the key after the cutting unit is raised.

2. Position the castor wheel axles in the same holes in all castor forks. Refer to Figure 7, Figure 8 and Figure 9 to determine the correct holes for the setting.

   

   Figure 7

   1. Tensioning cap
   2. Spacers
   3. Shims
   4. Axle mounting holes
   5. Castor Wheel
   

   Figure 8

   Note: When operating in 64 mm (2-1/2 inch) height of cut or higher, the axle bolt must be installed in the lower castor fork hole to prevent grass buildup between the wheel and the fork. When operating in height of cuts lower than 64 mm (2-1/2 inches) and grass buildup is detected, reverse the machines direction to pull any clippings away from the wheel/fork area.

Note: If you use the cutting unit at the 25 or 38 mm (1 or 1-1/2 inch) height-of-cut setting, reposition the cutting unit rollers in the top bracket holes.

1. Adjust the front rollers as follows:

   1. Remove the screw and nut securing the roller shaft to the cutting unit bracket (Figure 10).

      

      Figure 10

      1. Roller
      2. Roller shaft

   2. Slide the shaft out of the lower bracket holes, align the roller with the top holes, and install the shaft.

   3. Install the screw and nut to secure the assemblies.

2. Adjust the rear (internal) rollers as shown in Figure 11.

   

   Figure 11

   1. Internal rollers

Mount the skids in the lower position when operating in height of cuts higher than 64 mm (2-1/2 inches) and in the higher position when operating in height of cuts lower than 64 mm (2-1/2 inches).

Note: When the skids become worn, you can switch the skid to the opposite sides of the mower, flipping them over. This will allow you to use the skids longer before replacing them.

1. Disengage the PTO and engage the parking brake.

2. Shut off the engine, remove the key, and wait for all moving parts to stop before leaving the operating position.

3. Loosen the screw at the front of each skid (Figure 12).

4. Remove the flange-head bolts and nuts from each skid.

5. Move each skid to the desired position and secure them with the flange-head bolts and nuts (Figure 12).

   Note: Only use the top or center sets of holes to adjust the skids. The bottom holes are used when switching sides on a Guardian mower, at which time they become the top holes on the other side of the mower.

   

   Figure 12

   1. Screw
   2. Flange-head bolt
   3. Skid
   4. Nut

6. Torque the screw at the front of each skid to 9 to 11 N⋅m (80 to 100 in-lb).

Whenever you change the height-of-cut, adjust the height of the anti-scalp rollers.

1. After adjusting the height-of-cut, adjust the rollers by removing the flange nut, bushing, spacer, and bolt (Figure 13).

   

   Figure 13

   1. 38 mm (1-1/2 inches)
   2. 51 mm (2 inches)
   3. 63 mm (2-1/2 inches)
   4. 76 mm (3 inches)
   5. Bolt
   6. Bushing
   7. Anti-scalp roller
   8. Spacer
   9. Flange nut

2. Select a hole so that the anti-scalp roller is positioned to the nearest corresponding height of cut desired.

3. Install the flange nut, bushing, spacer, and bolt. Torque to 54 to 61 N∙m (40 to 45 ft-lb) (Figure 13).

You can adjust the mower discharge flow for different types of mowing conditions. Position the cam locks and baffle to give the best quality of cut.

1. Adjust the cam locks by swinging the lever up to loosen the cam lock (Figure 14).

2. Adjust the baffle and cam locks in the slots to the desired discharge flow.

3. Swing the lever back over to tighten the baffle and cam locks (Figure 14).

4. If the cam locks do not lock the baffle into place or it is too tight, loosen the lever and then rotate the cam lock. Adjust the cam lock until you achieve the desired locking pressure.

   

   Figure 14

   1. Unlock lever
   2. Rotate the cam lock to increase or decrease locking pressure
   3. Position the baffle
   4. Lock lever

The following figures are recommendations only. Adjustments will vary by grass type, moisture content, and height of grass.

Note: If the engine power draws down and the mower ground speed is the same, open up the baffle.

Position B

Use this position when bagging. Always align it with the blower opening.

Figure 16

Cutting unit pitch is the difference in height-of-cut from the front of the blade plane to the back of the blade plane. Use a blade pitch of 8 mm (5/16 inch). That is the back of the blade plane is 8 mm (5/16 inch) higher than the front.

1. Position the machine on a level surface on the shop floor.

2. Set the cutting unit to the desired height-of-cut.

3. Rotate 1 blade so that it points straight forward.

4. Use a short ruler to measure from the floor to the front tip of the blade. Rotate the blade tip to the rear and measure from the floor to the tip of the blade.

5. Subtract the front dimension from the rear dimension to calculate the blade pitch.

6. Adjust the shims, on the front or rear castor arms, to attain the required cutting unit pitch (Figure 18).

   

   Figure 18

   1. Tensioning cap
   2. Shims
   3. “C-shaped spacers
   4. Castor wheel
   5. Axle mounting holes

Due to differences in grass conditions and the counterbalance setting of the traction unit, it is advised that grass be cut and appearance checked before formal cutting is started.

1. Set the cutting unit to the desired height of cut; refer to Adjusting the Height of Cut.

2. Check and adjust front and rear tractor tire pressure to 138 kPa (20 psi).

3. Check and adjust all castor tire pressures to 345 kPa (50 psi).

4. Check for bent blades; refer to Checking for a Bent Blade.

5. Cut grass in a test area to determine if all cutting units are cutting at the same height.

6. If cutting unit adjustments are still needed, find a flat surface using a 2 m (6 ft) or longer straight edge.

7. To ease measuring blade plane, raise the height of cut to the highest position; refer to Adjusting the Height of Cut.

8. Lower the cutting unit onto the flat surface. Remove the covers from the top of the cutting units.

9. Rotate the blade on each spindle until the ends face forward and backward.

10. Measure from the floor to the front tip of the cutting edge.

11. Adjust the shims on the castor fork(s) to match the height of cut to the decal; refer to Front Castor Wheels.

The mower has a hinged grass deflector that disperses clippings to the side and down toward the turf.

The machine has grease fittings that you must lubricate regularly with No. 2 lithium grease.

Lubricate the following areas:

• Castor fork shaft bushings (4) (Figure 19).

  

  Figure 19

• Spindle shaft bearings (3) (located under the pulley) (Figure 20)

  

  Figure 20

• Idler arm shaft bearings (Figure 20)

• Lift arm pivots, front (2) (Figure 21)

  

  Figure 21

  1. Lift arm
  2. Clevis pin
  3. Hairpin cotter
  4. Pivot support

• Lift arm pivots, rear (2) (Figure 22)

  

  Figure 22

The gearbox in designed to operate on SAE 80–90 weight gear lube. Although the gearbox comes with lubricant from the factory, check the level before operating the cutting unit. The gearbox capacity is 283 ml (12 fl oz).

1. Park the machine and cutting unit on a level surface.

2. Remove the dipstick/fill plug from the top of the gearbox (Figure 23) and ensure that the lubricant is between the marks on the dipstick. If the lubricant level is low, add enough lubricant until the level is between the marks.

   

   Figure 23

   1. Dipstick/fill plug

Important: The fasteners on the covers of this machine are designed to remain on the cover after removal. Loosen all the fasteners on each cover a few turns so that the cover is loose but still attached, then go back and loosen them until the cover comes free. This prevents you from accidentally stripping the bolts free of the retainers.

1. Park the machine on level surface, lower the cutting unit to the floor, move the lift lever to the FLOAT position, shut off the engine, and engage the parking brake.

2. Remove the hairpin cotters and clevis pins securing the lift arms to the castor arm brackets (Figure 24).

   

   Figure 24

   1. Lift arm
   2. Clevis pin
   3. Hairpin cotter
   4. Castor arm bracket

3. Roll the cutting unit away from the traction unit, separating the male and female sections of the PTO shaft (Figure 25).

   

   Figure 25

   1. PTO shaft

   Danger

   If you start the engine and the PTO shaft is allowed to rotate, serious injury could result.

   Do not start the engine and engage the PTO lever when the PTO shaft is not connected to the gearbox on the cutting unit.

1. Position the machine on a level surface and shut the engine off.

2. Move the cutting unit into position in front of the traction unit.

3. Slide the male PTO shaft into the female PTO shaft (Figure 25).

4. Press the lift switch forward to the FLOAT position. Push a lift arm down until the holes in the lift arm line up with the holes in the castor arm bracket and you can insert the height-of-cut rod into the lift arm pads (Figure 26).

5. Secure the lift arm to the castor arm with 2 thrust washers, a clevis pin, and a hairpin cotter, position the thrust washers between the lift arm and the castor arm bracket (Figure 26), and insert end of cotter pin into the slot in the castor arm tab to retain cotter pin.

6. Repeat the procedure on the opposite lift arm.

7. Start the traction unit and raise the cutting unit.

   

   Figure 26

   1. Castor arm bracket
   2. Hairpin cotter
   3. Clevis pin
   4. Lift arm
   5. Thrust washer

The castor arms have bushings pressed into the top and bottom of the tube, and after many hours of operation, the bushings will wear.

To check the bushings, move the castor fork back and forth and from side to side. If the castor spindle is loose inside the bushings, the bushings are worn; replace them.

1. Raise the cutting unit so that the wheels are off of the floor. Block the cutting unit so that it cannot accidentally fall.

2. Remove the tensioning cap, spacer(s), and thrust washer from the top of the castor spindle.

3. Pull the castor spindle out of the mounting tube. Allow the thrust washer and spacer(s) to remain on the bottom of the spindle.

4. Insert a pin punch into the top or bottom of the mounting tube and drive the bushing out of the tube (Figure 27). Also, drive the other bushing out of the tube. Clean the inside of the tubes to remove dirt.

   

   Figure 27

   1. Castor arm tube
   2. Bushings

5. Apply grease to the inside and outside of the new bushings. Use a hammer and flat plate to drive the bushings into the mounting tube.

6. Inspect the castor spindle for wear and replace it if damaged.

7. Push the castor spindle through the bushings and mounting tube, slide the thrust washer and spacer(s) onto the spindle, and install the tensioning cap on the castor spindle.

1. Remove the locknut from the bolt holding the castor wheel assembly between the castor fork (Figure 28). Grasp the castor wheel and slide the bolt out of the fork or pivot arm.

   

   Figure 28

   1. Castor wheel
   2. Castor fork
   3. Bearing (2)
   4. Bearing spacer

2. Remove the bearing from the wheel hub and allow the bearing spacer to fall out (Figure 28). Remove the bearing from the opposite side of the wheel hub.

3. Check the bearings, spacer, and inside of the wheel hub for wear. Replace any damaged parts.

4. To assemble the castor wheel, push the bearing into the wheel hub. When installing the bearings, press on the outer race of the bearing.

5. Slide the bearing spacer into the wheel hub. Push the other bearing into the open end of the wheel hub to captivate the bearing spacer inside the wheel hub.

6. Install the castor wheel assembly between the castor fork and secure it in place with the bolt and locknut.

The blade drive belt, tensioned by the spring loaded idler pulley, is very durable. However, after many hours of use, the belt will show signs of wear. Signs of a worn belt are squealing when belt is rotating, blades slipping when cutting grass, frayed edges, burn marks, and cracks. Replace the belt if any of these conditions occur.

1. Lower the cutting unit to the shop floor. Remove the belt covers from the top of the cutting unit and set the covers aside.

2. Using a torque wrench or similar tool, move the idler pulley (Figure 33) away from the drive belt to release the belt tension and allow the belt to be slipped off the gearbox pulley (Figure 34).

   

   Figure 33

   1. Idler pulley
   

   Figure 34

   1. Gearbox

3. Remove the old belt from around the spindle pulleys and idler pulley.

4. Route the new belt around the spindle pulleys and idler pulley assembly as shown in Figure 35.

   

   Figure 35

   1. Belt routing

5. Install the belt covers.

1. Remove the locknut, bolt, spring and spacer holding the deflector to the pivot brackets (Figure 36). Remove the damaged or worn grass deflector.

2. Place the spacer and spring onto grass deflector. Place the L-end of the spring behind the cutting unit edge.

   Note: Ensure that the L-end of the spring is installed behind the cutting unit edge before installing the bolt as shown in Figure 36.

3. Install the bolt and nut. Place the J-hook end of the spring around the grass deflector (Figure 36).

   Important: You must be able to lower the grass deflector into position. Lift the deflector up to test that it lowers into the full down position.

   

   Figure 36

   1. Bolt
   2. Spacer
   3. Locknut
   4. Spring
   5. Spring installed
   6. Grass deflector
   7. L-end of spring, place behind the cutting unit edge before installing bolt
   8. J-hook end of the spring

Remove the grass buildup under the cutting unit daily.

1. Disengage the PTO, release the traction pedal to the neutral position, and engage the parking brake.

2. Move the throttle lever to the SLOW position, shut off the engine, remove the key, and wait for all moving parts to stop before leaving the operator’s position.

3. Raise the cutting unit to the TRANSPORT position.

4. Use a jack to raise the front of the machine and support it with jack stands.

5. Thoroughly clean the underside of the cutting unit with water.