24in Stand-On Aerator

Located to the left of the ignition switch on the control console.

• The hour meter monitors and displays engine hours.

  

  Figure 9

  Hour Meter Display

  1. LCD Indicators/Information screen
  2. Hour display
  3. LED status light

  Hours are displayed when the key is off or when the machine is running. Hours are not displayed when the machine is aerating.

  Note: The LCD indicator appears in the parking brake setting when it meets the safe to start mode (parking brake engaged).

• The tine engagement display monitors and displays the electronic tine depth setting.

Figure 10

Tine Engagement Display

1. LCD Indicators/Information screen
2. Tine depth status bar
3. Tine depth setting indicator
4. LED status light

There are two ways to activate the display.

1. Tap the multi-function switch either up or down to display the tine engagement meter.

2. Step on the tine ground engagement foot switch.

A higher number on the status bar increases the length of the aeration plug and a lower number decreases it.

Note: If the plug length is not the desired length, you may need to adjust the machine to accommodate for your weight; refer to the Adjusting the Operator Weight Control Valve.

Located on the right side of the hour meter/tine engagement display.

The LED is multi-colored to indicate the system status and is located on the right side of the panel.

• Solid Green — indicates normal operating activity

• Blinking Red — indicates that a fault is active

• Solid Red — indicates that maintenance is required

The information screen uses the following icons:

Aerating Hours	Parking brake
Battery Voltage	Engine Oil Maintenance
Hour Meter	Transmission Oil Maintenance
Voltage Error	Valve Solenoid Error
Valve Solenoid Connection Error

When the key is switched from OFF to RUN position, the following screens display for 2 seconds. The LED status light changes from red to orange to green.

The first screen displays the firmware version.

Figure 11

The second screen displays the aeration hours to the tenth of an hour.

Figure 12

The third screen displays the battery voltage to the tenth of a volt.

Figure 13

The fourth screen displays the hours until the engine oil maintenance is required. If the service is not performed, the time is recorded as negative hours to indicate the number of hours past due for the service (up to -500 hours).

Figure 14

The final screen displayed is the hours until transmission oil maintenance is required. If the service is not performed, the time is recorded as negative hours to indicate the number of hours past due for the service (up to -500 hours).

Figure 15

The hour meter displays the number of engine hours until either the engine oil or transmission oil maintenance is due. The reminder flashes and the LED displays a steady red light.

An alert occurs when the hour counter reaches zero. If the service is not performed, the time is recorded as negative hours to indicate the number of hours past due for the service (up to -500 hours) (reference Figure 16 and Figure 17). The hour meter switches between the default screen and the active alert screen. If more than 1 alert is active, the display cycles between the alerts in the order that they occurred before cycling back to the default screen.

The alerts only display when the default screen has been active for 2 seconds; however if the key is moved to the START position, the alerts occur immediately. When the machine is aerating, the alert screen does not display but the LED status light remains a steady red.

There are two maintenance reminders:

1. Service Engine

   The engine-oil service reminder counts down from the initial break-in service interval of 5 engine hours and then counts down from 100 hours for each service interval thereafter.

   

   Figure 16

2. Service Transmission

   The transmission oil maintenance reminder counts down from the initial break-in service interval of 250 engine hours and then counts down from 500 hours for each service interval thereafter.

   

   Figure 17

You can reset maintenance reminders manually.

• You can enter the engine service reminder reset mode by cycling the key switch between the RUN position and the OFF position 4 times within 8 seconds with the parking brake engaged.

  When the Service Engine screen displays and flashes, you can reset the engine-oil maintenance reminder by pressing the down on the multi-function switch. Once the reminder resets, the screen exits the Service Engine screen and returns to the default screen.

  You can exit the Service Engine screen at any time by turning the key to either the OFF or the START position.

• You can enter the transmission-oil maintenance reminder reset mode by cycling the key switch from the RUN position to the OFF position and back to the RUN position, 6 times within 8 seconds, with the parking brake engaged.

  When the Service Transmission screen displays and flashes, you can reset the transmission-oil maintenance reminder by pressing down on the multi-function switch.

  You can exit the Service Engine screen at any time by turning the key to either the OFF or the START position.

The system is capable of displaying the following errors:

• Voltage Error

  This occurs when the Key-Run voltage is less than 12.3 or greater than 16, a voltage error flashes. The LED flashes a red light.

  

  Figure 18

• Valve Solenoid Open Error

  If either 1 of the 2 valve solenoids disconnect, the number 6 displays in the lower left corner of the screen. The LED flashes a red light.

  

  Figure 19

  1. Number 6 displays

• Valve Solenoid Overcurrent Error

  If an overcurrent event occurs, the number 2 displays in the lower left corner of the screen. Check the valve solenoid and inspect it for damage and wear. The LED flashes a red light.

  

  Figure 20

  1. Number 2 displays

• Valve Solenoid Connection Error

  The system displays the Valve Solenoid Connection Error alert and the LED flashes red when the system detects an error. If the valve solenoids are connected incorrectly (i.e. the connector for the relief valve is connected to the other valve solenoid) the tines do not operate until the fault is corrected.

  

  Figure 21

Important: For best results, use only clean, fresh fuel (less than 30 days old).

• Do not use gasoline containing methanol.

• Do not store fuel either in the fuel tank or fuel containers over the winter unless you use a fuel stabilizer.

• Do not add oil to gasoline.

Use fuel stabilizer/conditioner in the machine at all times to keep the fuel fresh longer when used as directed by the fuel-stabilizer manufacturer.

Important: Do not use fuel additives containing methanol or ethanol.

Add the amount of fuel stabilizer/conditioner to fresh fuel as directed by the fuel-stabilizer manufacturer.

Fuel-tank capacity: 7 L (1.9 US gallons)

1. Clean around the fuel-tank cap.

2. Remove the cap from the tank.

3. Fill the fuel tank with fuel to within 6 to 13 mm (1/4 to 1/2 inch) from the top of the tank. Do not fill into the filler neck.

   Important: Do not fill the tank more than 6 mm (1/4 inch) from the top of the tank because the fuel must have room to expand.

4. Install the fuel-tank cap and wipe up any spilled fuel.

Note: The state parking brake interlock you are checking is shown in bold.

Engage the parking brake	The starter rotates

Note: The state parking brake interlock you are checking is shown in bold.

Disengage the parking brake	The starter should not rotate

1. Park the machine on a level surface and engage the parking brake.

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

3. Allow the engine to cool.

4. Disconnect the spark-plug wire from the spark plug and keep the wire away from the plug, to prevent accidental starting (Figure 29).

   

   Figure 29

   1. Spark-plug wire

Important: Do not lubricate the chains with penetrating oil or solvents. Use an oil or chain lubricant.

1. Shut off the engine, wait for all moving parts to stop, and remove the key. Engage the parking brake.

2. Lift the rear of the machine and support using jack stands or equivalent support.

   Caution

   Raising the machine for service or maintenance relying solely on mechanical or hydraulic jacks could be dangerous. The mechanical or hydraulic jacks may not be enough support or may malfunction allowing the machine to fall, which could cause injury.

   Do not rely solely on mechanical or hydraulic jacks for support. Use adequate jack stands or equivalent support.

3. Start the engine and move throttle control ahead to 1/2 throttle position. Disengage the parking brake.

   Warning

   The engine must be running and the drive wheels must be turning so that adjustments can be performed. Contact with moving parts or hot surfaces may cause personal injury.

   Keep your fingers, hands, and clothing clear of rotating components and hot surfaces.

4. With the engine running, slowly move the motion-control levers forward and lubricate all 4 chains.

5. Check the condition and tension of the chains; refer to Checking the Condition of the Chains.

Note: See the chart below for service intervals.

1. Shut off the engine, wait for all moving parts to stop, and remove the key. Engage the parking brake.

2. Lubricate the fittings with NLGI grade No. 2 multi-purpose grease.

   Refer to the following chart for fitting locations and lubrication schedule.

   Lubrication Chart

   Fitting Locations	Initial Pumps	Number of Places	Service Interval
   1. Front Wheel Caster Hubs	1	2	Yearly
   2. Tine Shaft Bearings	1	4	25 hours
   3. Belt Idler Pivot	1	1	Yearly

   

   Figure 30

   1. Front wheel caster hubs
   2. Tine shaft bearings
   3. Belt idler pivot

Important: Do not operate the engine without the air filter assembly; extreme engine damage may occur.

1. Release the latches on the cover for the air cleaner.

2. Remove the cover and clean it thoroughly ().

   Note: Be careful to prevent dirt and debris from falling into the base.

   

   Figure 31

   1. Air-filter base
   2. Paper air filter
   3. Foam pre-cleaner
   4. Cover
   5. Latch on the air-cleaner cover (2)

3. Remove the foam pre-cleaner, wash it with a mild detergent and water, and then blot it dry (Figure 31).

4. Remove and inspect the paper air filter (); discard it if it is excessively dirty.

   Important: Do not try to clean a paper filter.

5. Wipe dirt away from the base and the cover with a moist rag.

   Note: Be careful to prevent dirt and debris from entering the air duct leading to the carburetor.

6. Install the foam pre-cleaner onto the paper air filter (Figure 31).

   Note: Use a new paper air filter if you discarded the old one.

7. Install the air filter assembly to the air-filter base (Figure 31).

8. Align the arrow decal on the air-cleaner cover and the arrow decal on the base (Figure 32).

   

   Figure 32

   1. Alignment-arrow decal (normal ambient air position shown)

9. Secure the air-filter cover to the base with the latches.

Type for all Engines: NGK BR6HS, Champion RTL86C, or equivalent

Air Gap: 0.76 mm (0.030 inch)

Ensure that the air gap between the center and side electrodes is correct before installing the spark plug.

Use a spark plug wrench for removing and installing the spark plug(s) and a gapping tool/feeler gauge to check and adjust the air gap. Install a new spark plug(s) if necessary.

Checking the Spark Plug

Important: Do not clean the spark plug(s). Always replace the spark plug(s) when it has a black coating, worn electrodes, an oily film, or cracks.

If you see light brown or gray on the insulator, the engine is operating properly. A black coating on the insulator usually means the air cleaner is dirty.

Set the gap to 0.75 mm (0.03 inch).

Figure 38

Installing the Spark Plug

Tighten the spark plug(s) to 22 N∙m (16 ft-lb).

Figure 39

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

2. Allow the muffler to cool.

3. Check the spark arrester for breaks in the screen or welds.

   Note: Replace the spark arrester if it is worn or damaged.

4. If you see that the screen is plugged, perform the following:

   1. Remove the spark arrester.

   2. Shake loose the particles from the arrester and clean screen with a wire brush.

      Note: Soak the arrester screen in solvent if necessary.

   3. Install spark arrester onto exhaust outlet.

1. Check the weak battery for terminal corrosion and clean it prior to jump starting. Clean and tighten connections as necessary.

   Caution

   Corrosion or loose connections can cause unwanted electrical voltage spikes at anytime during the jump-starting procedure.

   Do not attempt to jump start with loose or corroded battery terminals or damage to the engine may occur.

   Danger

   Jump starting a weak battery that is cracked, frozen, has low electrolyte level, or an open/shorted battery cell, can cause an explosion resulting in serious personal injury.

   Do not jump start a weak battery if these conditions exist.

2. Ensure that the booster is a good and fully charged lead acid battery at 12.6 V or greater. Use properly sized jumper cables (4 to 6 AWG) with short lengths to reduce voltage drop between systems. Ensure that the cables are color coded or labeled for the correct polarity.

   Caution

   Connecting the jumper cables incorrectly (wrong polarity) can immediately damage the electrical system.

   Be certain of the battery terminal polarity and jumper cable polarity when hooking up the batteries.

   Warning

   Batteries contain acid and produce explosive gases.

   • Shield your eyes and face from the batteries at all times.

   • Do not lean over the batteries.

   Note: Ensure that the vent caps are tight and level. Place a damp cloth, if available, over any vent caps on both batteries. Ensure that the vehicles do not touch and that both electrical systems are off and at the same rated system voltage. These instructions are for negative ground systems only.

3. Connect the positive (+) cable to the positive (+) terminal of the discharged battery that is wired to the starter or solenoid as shown in .

   

   Figure 40

   1. Positive (+) cable on discharged battery
   2. Positive (+) cable on booster battery
   3. Negative (–) cable on the booster battery
   4. Negative (–) cable on the engine block
   5. Booster battery
   6. Discharged battery
   7. Engine block

4. Connect the other end of the positive cable to the positive terminal of the booster battery.

5. Connect the black negative (–) cable to the other terminal (negative) of the booster battery.

6. Make the final connection on the engine block of the stalled vehicle (not to the negative post) away from the battery. Stand back.

7. Start the vehicle and remove the cables in the reverse order of connection (the engine block (black) connection is the first to disconnect).

Allowing batteries to stand for an extended period of time without recharging them results in reduced performance and service life. To preserve optimum battery performance and life, charge batteries in storage when the open circuit voltage drops to 12.4 V.

Note: To prevent damage due to freezing, the battery should be fully charged before putting away for winter storage.

Note: The machine is shipped with a filled, lead-acid battery.

Note: You do not adjust air pressure for the semi-pneumatic caster tires.

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

2. Check the air pressure of the drive tires.

3. Adjust the air pressure in the drive tires to 152 to 165 kPa (22 to 24 psi).

Torque the wheel hub bolts (Figure 41) to 37 to 45 N∙m (27 to 33 ft-lb).

Note: Do not use anti-seize compound on the wheel hub.

Figure 41

1. Lug nut
2. Hub bolt

Torque the wheel lug nuts (Figure 41) to 115 to 142 N∙m (85 to 105 ft-lb).

1. Shut off the engine, engage the parking brake, wait for all moving parts to stop, and remove the key.

2. Check the chains on both sides of the machine for proper tension. The chains should be able to move up and down 1/4 to 1/2 inch (6 to 12 mm).

3. If chains pop or snap refer to Adjusting the Drive Wheel Chain Tension and Adjusting the Tine Drive Chain.

1. Shut off the engine, engage the parking brake, wait for all moving parts to stop, and remove the key.

2. Inspect sprockets for wear and replace as required.

Torque the nuts (Figure 43) on the transmission output tapered shafts to 285 to 353 N∙m (210 to 260 ft-lb).

Figure 43

1. Nut (transmission-output shaft)

1. Refer to Preparing for Maintenance.

2. Push the control levers all the way forward to the front reference bar; If either of the control levers contact the reference bar do the following:

   1. Allow the control levers to return to neutral and loosen the 2 jam nuts on the hex adjustment linkage (Figure 44).

      Note: One jam nut is a right-hand thread and the other is left-hand.

      

      Figure 44

      1. Hex adjustment linkage jam nut

   2. Turn the hex adjustment linkage until there is 1/8 to 1/4 inch (3 to 6 mm) gap between the control lever and the front reference bar.

   3. Tighten the jam nuts (Figure 44).

3. Allow the control levers to return to neutral. Turn the left hex adjustment link until the motion control levers are approximately even with each other.

4. Repeat steps 2 and 3 for the other motion control linkage.

If the machine travels or pulls to one side when the motion control levers are in the full forward position, adjust the tracking.

1. Push both control levers forward the same distance.

2. Check if the machine pulls to one side; If it does, stop the machine and set the parking brake.

3. Loosen the lock nuts on the right motion control linkage (as viewed from the rear of the machine. Push the right control lever forward and rotate the adjustment rod until there is 1/8 to 1/4 inch (3 to 6 mm) gap between the right control lever and the front reference bar.

4. Place the front reference/speed control bar in the maximum forward position; refer to Adjusting the Front Reference/Speed Control Bar.

5. Rotate the adjustment rod on the left side of the machine (Figure 45).

   

   Figure 45

   1. Adjustment rod

6. Looking down towards the adjustment rod — rotate it counterclockwise, in 1/4 turn increments, to increase speed or clockwise to decrease speed.

7. Drive the machine and check the full forward tracking.

8. Repeat steps 5 through 7 until desired tracking is obtained.

Torque the 4 transmission bolts to 56-69 N-m (41-51 ft-lb); refer to Figure 46.

Note: Do Not use anti-seize compound on the wheel hub.

Figure 46

1. Transmission bolts

If the parking brake does not hold securely, an adjustment is required.

1. Refer to Preparing for Maintenance.

2. Check the air pressure in the drive tires. If needed, adjust to the recommended inflation; refer to Checking the Drive Tire Air Pressure.

3. Disengage the parking brake.

4. Loosen the cable clamp on the brake cables under the console (Figure 47).

5. Adjust both cable conduits downward approximately 1/8 to 1/4 inch (3 to 6 mm).

   

   Figure 47

   1. Cable clamp

6. Tighten the cable clamp and engage the parking brake.

7. Check the parking brake; repeat steps 4 through 6 if necessary.

1. Shut off the engine, engage the parking brake, wait for all moving parts to stop, and remove the key.

2. Check the auxiliary pump drive belt condition and tension; the belt should be snug. Refer to Adjusting the Auxiliary Pump Drive Belt.

3. Check the condition of the transmission drive belt.

1. Shut off the engine, engage the parking brake, wait for all moving parts to stop, and remove the key.

2. Remove the top thumbscrew, loosen the side thumbscrew, and remove the left hydraulic compartment cover (Figure 48).

   

   Figure 48

   1. Thumbscrews
   2. Hydraulic compartment cover (left)

3. Loosen the 2 flange locknuts (3/8 inch) securing the auxiliary pump to the mounting bracket (Figure 49).

   

   Figure 49

   1. Auxiliary pump drive belt
   2. Auxiliary pump
   3. Flange locknuts

4. Slide the pump outward (Figure 49) in slots and torque the flange locknuts to 37 to 45 N∙m (27 to 33 ft lb).

   When properly adjusted, the belt should have 1/2 inch (1.3 cm) of deflection with 3 pounds of force on the belt midway between the auxiliary pump and engine pulley.

5. Align the hole and slot in the left hydraulic compartment cover with the supports of the machine and secure the cover with the 2 thumbscrews (Figure 48).

Note: No adjustments are required for belt tension.

1. Shut off the engine, engage the parking brake, wait for all moving parts to stop, and remove the key.

2. Install the new belt.

3. Ensure that the idler arm and pulley can move freely.

Hydraulic fluid type: AW-32 hydro fluid

Note: The machine is shipped with hydraulic fluid in the reservoir.

1. Run the machine for approximately 15 minutes to purge any extra air out of the hydraulic system.

2. Completely raise and lower the tines 3 times to purge the air.

3. Shut off the engine, remove the key and allow the machine to cool.

4. Remove the cap and check the hydraulic-fluid level in the reservoir.

   Note: The hydraulic-fluid level should cover the word FULL COLD that is embossed into the baffle of the reservoir (Figure 50).

   

   Figure 50

   1. Cap
   2. Auxiliary hydraulic reservoir
   3. Hot fluid level (baffle)
   4. Cold fluid level (baffle)

5. If necessary, add the specified hydraulic fluid to the reservoir until the fluid covers the FULL COLD fluid level on the baffle (Figure 50).

   Note: If the fluid is at ambient-air temperature, about 24°C (75° F), fill only to the FULL COLD level.

6. Install the hydraulic reservoir cap (Figure 50) and tighten it until snug.

   Note: Do not overtighten the reservoir cap.

Transmission fluid type: Toro® Hypr-Oil™ 500 or Mobil® 1 15W-50 synthetic motor oil.

Important: Use the specified fluid. Other fluids could cause system damage.

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

2. Allow the machine to cool.

3. Remove the cap from the expansion tank and check the transmission-fluid level in the tank (Figure 53).

   Note: The transmission fluid level should cover the FULL COLD fill line molded into the side of the tank.

   

   Figure 53

   1. Cap
   2. Filler neck (expansion tank)
   3. FULL COLD line

4. If necessary, add the specified transmission fluid until the fluid level is at the FULL COLD fill line of the expansion tank (Figure 53).

5. Install the expansion tank cap and tighten it until snug.

   Important: Do not overtighten the expansion tank cap.

Important: Do not change the hydraulic fluid (except for what can be drained when changing filter and removing the drain plugs), unless it is felt the oil has been contaminated or been extremely hot.Changing the oil unnecessarily could damage hydraulic system by introducing contaminants into the system.

The operator weight adjustment valve is located at the left side of the control console (Figure 55).

Figure 55

1. Operator weight adjustment control

Use the operator weight adjustment valve to help compensate for the weight of the operator so that the machine achieves the correct aerating pressure, plug length, and to help maximize lateral machine stability; refer to the following procedures:

• Assembling the Weight Control Knob

• Adjusting the Operator Weight Control Valve

• Removing the Weight Control Knob

Important: Adjust the operator weight adjustment valve if the weight of each operator differs.

1. Ensure that the setscrew in the weight control knob is rotated counterclockwise enough so that the knob slips over the shaft of the weight control valve (Figure 56).

   

   Figure 56

   1. Weight control valve
   2. Jam nut
   3. Knob

2. Ensure that the jam nut on the shaft of the weight control valve is tightened (Figure 56); refer to step 6 in Adjusting the Operator Weight Control Valve.

3. Assemble the knob onto the shaft of the weight control valve (Figure 56).

4. Tighten the setscrew of the knob by hand.

Note: Adjust the system pressure so that the drive tires lightly touch the ground.

Important: Keep the drive tires on the ground at all times to maximize lateral machine stability.

1. Raise the tines, drive the aerator to a hard, flat turf surface, and stop the aerator, but leave the engine running.

2. Have the operator stand on the operator’s platform.

3. Loosen the jam nut for the weight control valve, refer to Figure 56 in Assembling the Weight Control Knob.

4. Press the tine ground engagement foot switch to lower the tines.

   • If the machine raises and the ground tires are no longer touching, rotate the operator weight adjustment control counterclockwise to lower the machine until the tires touch the ground.

   • If the tines are not touching the ground, rotate the operator weight adjustment control clockwise until the tines lower and touch the ground (but not raise the machine).

   Important: Keep the drive tires on the ground at all times to maximize lateral machine stability.

5. Release the tine ground engagement foot switch to raise the tines.

6. While holding the position of the knob for the weight control valve, tighten the jam nut.

   Note: If you are having difficulty maintain the valve adjustment while tightening the jam nut, use a hex key in the shaft of the weight control valve.

   

   Figure 57

   1. Set screw (knob)
   2. Hex socket (shaft—weight control valve)

1. Loosen the setscrew in the knob for the weight control valve; refer to Figure 57 in Adjusting the Operator Weight Control Valve.

2. Lift the knob straight from the shaft.

   Note: Do not twist the knob while removing it. If you need help maintaining the position of the control-valve shaft, use a hex key in the hex socket of the shaft to hold the align; refer to Figure 57 in Adjusting the Operator Weight Control Valve.

3. If the setscrew of the knob raised a burr on the shaft of the weight control valve, carefully remove the burr.

4. Store the knob for future adjustments.

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

2. Raise the machine and support it with jack stands with a 460 kg (1,015 lb) capacity.

   Caution

   Raising the machine for service or maintenance relying solely on mechanical or hydraulic jacks could be dangerous. The mechanical or hydraulic jacks may not be enough support or may malfunction allowing the machine to fall, which could cause injury.

   Do not rely solely on mechanical or hydraulic jacks for support. Use adequate jack stands or equivalent support.

3. Remove the 2 thumbscrews (3/8 x 1 inch) and 2 washers (3/8 inch) that secure the rear-cover panel to the chassis, and remove the panel (Figure 58).

   

   Figure 58

   1. Chassis hole
   2. Rear panel
   3. Washer (3/8 inch)
   4. Thumbscrew (3/8 x 1 inch)

4. Remove rocks and other debris from the tines.

5. Inspect the tines for wear and damage.

   Note: Replace any tines that are worn or damaged.

6. Align the holes in the rear-cover panel to the holes in the chassis (Figure 58).

7. Secure the cover panel to the chassis with the 2 thumbscrews and 2 washers (Figure 58) that you removed in step 3, and torque the bolts to 37 to 45 N∙m (27 to 33 in-lb)

1. Shut off the engine, engage the parking brake, wait for all moving parts to stop, and remove the key.

2. Lift the rear of the machine and support using jack stands or equivalent support.

3. Check the chains on each side of the idler sprocket, at both sides of the machine, for proper tension.).

   The chains should move up and down 6 to 12 mm (1/4 to 1/2 inch).

4. To adjust the chain tension, loosen the idler bolt and threaded spacer, and push up on the sprocket to tighten the chain (Figure 59).

   Important: Do not overtighten the chain. Significant chain wear can occur and will shorten the life of an overtightened chain.

   

   Figure 59

   1. Idler bolt
   2. Idler sprocket
   3. Threaded spacer

5. Check the chain tension and tighten the idler bolt.

Check the gap between the spring bracket and the end of the spring as shown in Figure 60. The gap should measure 1.38 inch (35 mm). The adjustment is made by turning the bolt at the front of each spring (clockwise will shorten the gap, counter-clockwise will lengthen the gap).

Figure 60

1. 1.38 inch (35 mm)

Important: The springs must be replaced it the gap is less than 1.13 inches (29 mm). Always replace both return-to-up springs. This prevents uneven loading and possible damage to the machine.

1. Stop engine, wait for all moving parts to stop, and remove key. Engage parking brake.

2. Visually inspect machine for any loose hardware or any other possible problem. Tighten hardware or correct the problem before operating.

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

2. Clean all debris from screen at the top of the engine, around engine shrouding, and exhaust system area.

3. Wipe up any excessive grease or oil around the engine and exhaust system area.

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

2. Remove cooling shrouds from engine.

3. Clean cooling fins of the engine.

   Note: Also clean dust, dirt, and oil from external surfaces of engine, which can cause improper cooling.

4. Install the cooling shrouds into the engine.

   Important: Operating the engine without cooling shrouds causes engine damage due to overheating. Do not operate the machine without the cooling shrouds.

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

2. Clean off any oil, debris, or grass buildup on the machine and aerator deck.

3. Clean off any debris or grass under the chain guards, around the fuel tank, and around the engine and exhaust area.