STX-26 Stump Grinder

Before starting the machine each day, perform the Each Use/Daily procedures listed in .

1. Move the throttle lever midway between the SLOW and FAST positions (Figure 17).

   

   Figure 17

   1. Throttle lever
   2. Choke lever
   3. Key

2. Move the choke lever to the ON position (Figure 17).

   Note: A warm or hot engine may not require choking.

3. Turn the key to the ON position (Figure 17). When the engine starts, release the key.

   Important: Do not engage the starter for more than 10 seconds at a time. If the engine fails to start, allow a 30-second cooldown period between attempts. Failure to follow these instructions can burn out the starter motor.

4. Gradually move the choke lever to the OFF position (Figure 17). If the engine stalls or hesitates, engage the choke again until the engine warms up.

5. Move the throttle lever to the desired setting (Figure 17).

   Important: Running the engine at high speeds when the hydraulic system is cold (i.e., when the air temperature is at or below freezing) could damage the hydraulic system. When starting the engine in cold conditions, allow it to run in the middle throttle position for 2 to 5 minutes before moving the throttle to the FAST position.

   Note: If the outdoor temperature is below freezing, store the machine in a garage to keep it warmer and aid in starting.

Use the traction controls to move the machine. The farther you move the traction controls in any direction, the faster the machine moves in that direction. Release the traction controls to stop the machine.

The throttle control regulates the engine speed as measured in rpm (revolutions per minute). Place the throttle lever in the FAST position for best performance. You can, however, use the throttle position to operate at slower speeds.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Move the throttle lever to the SLOW position.

3. If the engine has been working hard or is hot, let it idle for a minute before turning the key switch to the OFF position.

   Note: This helps to cool the engine before you shut it off. In an emergency, you can shut off the engine immediately.

4. Turn the key switch to the OFF position and remove the key.

   Caution

   A child or untrained bystander could attempt to operate the machine and be injured.

   Remove the key from the switch when leaving the machine, even if just for a few seconds.

Note: Many variables, such as the type of tree, age, size, amount of moisture, and condition, affect the required amount of time and effort to grind a stump.

1. Start the engine, raise the grinder, set the throttle lever to the FAST position, and move the machine to the stump to be ground.

2. Use the grinder control lever and the traction control to position the grinder to the side of the front of the stump, about 2 cm (1 inch) below the surface (Figure 18).

3. Start the grinder and wait for it to get up to full speed.

4. Use the grinder control lever to swing the grinder slowly across the face of the stump, cutting away a swath of chips (Figure 18).

   Important: The grinder automatically slows down the speed at which it swings into the stump to maintain the optimum flywheel speed and not bog the engine down when cutting through the wood.

   

   Figure 18

5. Move the machine forward a few centimeters (inches) and repeat step 4(Figure 18).

6. Repeat steps 4 through 5 until you have ground off the entire face of the stump (Figure 18).

7. Back up the machine, position the grinder to the side of the front of the stump, and lower it to about 2 cm (1 inch) below the surface.

8. Repeat steps 4 through 7 until the stump is ground away.

9. If there are any large roots to be ground, position the grinder over each root and use the traction control and grinder control to move the grinder along the root, grinding it away.

10. Clean debris from the hydraulic lift, drives, mufflers, and engine after each use; refer to Removing Debris from the Machine.

• Clean the area of trash, branches, and rocks before operating to prevent equipment damage.

• Always use full throttle (maximum engine speed) when grinding.

• Cut the edges of the stump for more efficient grinding. Once your cutting swath is close to 1/4 of the wheel diameter, lower the grinder and begin cutting on the edge again.

  

  Figure 19

• Listen to the engine and watch the grinder wheel speed to maintain the speed of the wheel. Slow down the head sweep by feathering the joystick as cutting becomes difficult.

• As you grind from left to right, most of the debris goes to the left of the grinder wheel. When you grind from the right to left, the debris goes to the right.

• You may also grind a stump from the side to lessen turf damage.

Important: Do not tow or pull the machine without first opening the tow valves, or you will damage the hydraulic system.

1. Engage the parking brake and lower the grinder.

2. Shut off the engine and remove the key.

3. Remove the bottom shield.

4. Using a wrench, turn the tow valves on the hydraulic pumps twice counter-clockwise (Figure 20).

   

   Figure 20

   1. Tow valves

5. Install the bottom shield and tow the machine as required.

6. After repairing the machine, close the tow valves before operating it.

Important: Do not operate or drive the machine on roadways. Use care when loading or unloading the machine into a trailer or truck.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

3. Secure the machine to a trailer with chains or straps using the tie-down/lift loops at the front and rear of the machine (Figure 21 and Figure 22). Refer to your local ordinances for trailer and tie-down requirements.

   

   Figure 21

   1. Front tie-down loop
   

   Figure 22

   1. Rear tie-down loops

You can lift the machine using the tie-down/lift loops as lift points (Figure 21 and Figure 22).

Important: The fasteners on the covers of this machine are designed to remain on the cover after removal. Loosen all 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 a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

   Warning

   There is a belt under the cover that is moving when the machine is running and can catch fingers, hands, loose hair, and clothing, causing serious injury, amputation, or death.

   Always shut off the engine and wait for all moving parts to stop before removing the cover.

3. Loosen the bolt at the rear of the cover plate.

4. Loosen the 3 bolts securing the cover plate to the frame sequentially until the cover is loose (Figure 23).

   

   Figure 23

   1. Cover plate
   2. Bolts

5. Pull up the rear of the cover plate until it clears the engine and then pull it off over the bolt heads and off the machine.

6. To install the cover plate before operating the machine, slide the plate into place and secure it with the 3 bolts you loosened previously (Figure 23).

Important: The fasteners on the covers of this machine are designed to remain on the cover after removal. Loosen all 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 a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

3. Loosen the 2 bolts securing the bottom shield sequentially until the shield is free (Figure 24).

   

   Figure 24

   1. Bottom shield
   2. Bolts

4. Pull the shield back and out of the machine.

5. To install the shield before operating the machine, slide the bottom shield into the machine so that it rests on all 4 tabs and secure it with the 2 bolts you loosened previously (Figure 24).

   Note: You may need to lift up on the bottom shield to ensure that it rests on the front tabs.

Grease Type: General-purpose grease

1. Park the machine on a level surface and lower the grinder.

2. Shut off the engine and remove the key.

3. Clean the grease fittings with a rag.

4. Connect a grease gun to each fitting (Figure 25 and Figure 26).

5. Pump grease into the fittings until grease begins to ooze out of the bearings (approximately 3 pumps).

6. Wipe up any excess grease.

Figure 25

Figure 26

Make sure that the air gap between the center and side electrodes is correct before installing the spark plug(s). 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.

Type of Spark Plug: NGK^® BPR4ES or equivalent

Air Gap: 0.75 mm (0.03 inch)

Checking the Spark Plug(s)

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 34

Installing the Spark Plug(s)

Figure 35

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

3. Turn the fuel-shutoff valve to the closed position (Figure 36).

   

   Figure 36

   1. Fuel-shutoff valve

4. Squeeze the ends of the hose clamp on the engine side of the valve together and slide it up the fuel line away from the valve (Figure 36).

5. Pull the fuel line off the valve (Figure 36).

6. Open the fuel-shutoff valve and allow the fuel to drain into a fuel can or drain pan.

   Note: If desired, you can replace the fuel filter at this time; refer to Replacing the Fuel Filter.

7. Install the fuel line onto the fuel-shutoff valve. Slide the hose clamp close to the valve to secure the fuel line.

8. Wipe up any spilled fuel.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

   

   Figure 37

Always keep the battery clean and fully charged. Use a paper towel to clean the battery case. If the battery terminals are corroded, clean them with a solution of 4 parts water and 1 part baking soda. Apply a light coating of grease to the battery terminals to reduce corrosion.

Voltage: 12 V with 350 A (cold cranking) at -18°C (0ºF).

There are 4 fuses in the electrical system. They are under the control panel on the left side (Figure 40).

Figure 40

1. Fuse block

If the pump drive belt begins to squeal or is cracked, worn, or frayed, replace it. Contact your Authorized Service Dealer for a replacement belt.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

3. Raise the back of the machine and support it on jack stands.

4. Remove the bottom shield; refer to Removing the Bottom Shield.

5. Loosen the 2 pump bolts (Figure 47).

   

   Figure 47

   1. Pump
   2. Pump bolts
   3. Belt
   4. Idler-pulley spring

6. Twist the pump counterclockwise and allow it to drop down away from the pulley (Figure 47).

   Note: Ensure that the spider coupler drops down with the pump.

7. Using a spring puller (contact your Authorized Service Dealer) or stiff metal hook, pull the end of the idler pulley spring off the spring bolt to release tension on the belt (Figure 47).

8. Remove the belt.

9. Route a new belt around the pulleys.

10. Install the idler-pulley spring on the bolt.

11. Ensure that the spider coupler is in place on the pump and then insert it into the pulley, twisting it clockwise to seat it on the pump bolts.

12. Torque the pump bolts to 68 N∙m (50 ft-lb).

13. Install the bottom shield.

The factory adjusts the traction controls before shipping the machine. However, after many hours of use, you may need to adjust the traction-control alignment, the neutral position of the traction control, and the tracking of the traction control in the full forward position.

Important: To adjust the controls properly, complete each procedure in the order listed.

Hydraulic Tank Capacity: 23 L (6 US gallons)

Use only 1 of the following fluids in the hydraulic system:

• Toro Premium Transmission/Hydraulic Tractor Fluid (refer to your Authorized Service Dealer for more information)

• Toro Premium All Season Hydraulic Fluid (refer to your Authorized Service Dealer for more information)

• If either of the above Toro fluids are not available, you may use another Universal Tractor Hydraulic Fluid (UTHF), but they must be only conventional, petroleum-based products. The specifications must fall within the listed range for all the following material properties and the fluid should meet the listed industry standards. Check with your hydraulic fluid supplier to determine if the fluid meets these specifications.

  Note: Toro will not assume responsibility for damage caused by improper substitutions, so use only products from reputable manufacturers who will stand behind their recommendations.

  Material Properties
  Viscosity, ASTM D445	cSt at 40°C: 55 to 62
  	cSt at 100°C: 9.1 to 9.8
  Viscosity index, ASTM D2270	140 to 152
  Pour Point, ASTM D97	-37 to -43°C (-35 to -46°F)
  Industry Standards
  API GL-4, AGCO Powerfluid 821 XL, Ford New Holland FNHA-2-C-201.00, Kubota UDT, John Deere J20C, Vickers 35VQ25 and Volvo WB-101/BM

  Note: Many hydraulic fluids are almost colorless, making it difficult to spot leaks. A red dye additive for the hydraulic system fluid is available in 20 ml (0.67 fl oz) bottles. One bottle is sufficient for 15 to 22 L (4 to 6 US gallons) of hydraulic fluid. Order Part No. 44-2500 from your Authorized Service Dealer.

Refer to Hydraulic Fluid Specifications.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

3. Look into the glass bubble on the right side of the machine. If you cannot see hydraulic fluid in the bubble, continue this procedure to add fluid.

   

   Figure 55

   1. Hydraulic-fluid check bubble

4. Remove the cover plate; refer to Removing the Cover Plate.

5. Clean the area around the filler neck of the hydraulic tank and remove the cap and filter from the filler neck using a socket (Figure 56).

   

   Figure 56

   1. Filler-neck cap
   2. Hydraulic-fluid filter

6. If the level is low, add fluid until it is visible in the glass bubble.

7. Install the cap and filter on the filler neck and torque bolt on top to 13 to 15.5 N∙m (110 to 140 in-lb).

8. Install the cover plate; refer to Removing the Cover Plate.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

3. Remove the top cover.

4. Remove and discard the old filter (Figure 57).

   

   Figure 57

   1. Filler cap
   2. Hydraulic filter

5. Install the replacement hydraulic filter and filler cap (Figure 57) and torque the bolt on top to 13 to 15.5 N∙m (110 to 140 in-lb).

6. Clean up any spilled fluid.

7. Install the top cover.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine and remove the key.

3. Allow the machine to cool completely.

4. Remove the top cover.

5. Remove the hydraulic-tank filler cap and filter (Figure 56).

6. Place a drain pan capable of holding 37.8 L (10 US gallons) under the hydraulic tank.

7. Pinch the hose clamp and slide the clamp and hose off the fitting on the hydraulic tank, allowing the hydraulic fluid to drain from the hose and tank into the pan.

   

   Figure 58

   1. Hose
   2. Hydraulic-tank fitting
   3. Hose clamp

8. When finished, install the hose onto the fitting and secure it with the hose clamp.

   Note: Dispose of the used oil at a certified recycling center.

9. Fill the hydraulic tank with hydraulic fluid; refer to Hydraulic Fluid Specifications.

10. Install the hydraulic filter and filler cap (Figure 56) and torque the bolt on top to 13 to 15.5 N∙m (110 to 140 in-lb).

11. Start the engine and let it run for a few minutes.

12. Shut off the engine.

13. Check the hydraulic-fluid level and top it off if necessary; refer to Checking the Hydraulic-Fluid Level.

14. Clean up any spilled fluid.

15. Install the top cover.

Due to the high amount of wear placed on the teeth, you need to rotate and replace them periodically (Figure 59).

Figure 59

1. Sharp tooth
2. Worn tooth

Each tooth is indexed with 3 positions so you can rotate it twice, exposing a new sharp edge before replacing the tooth. To rotate a tooth, loosen the nut securing the tooth (Figure 60). Push the tooth forward and rotate it one third of a turn, bringing an unused edge to the outside. Torque the nut securing the tooth to 68 N∙m (50 ft-lb).

To replace a tooth, remove the nut securing the tooth to remove it, then install a new tooth, spacer, and nut in the same position (Figure 60). Torque the nut securing the tooth to 68 N∙m (50 ft-lb).

Figure 60

1. Nut
2. Tooth holder
3. Tooth

To replace the tooth pockets, refer to the Installation Instructions for the tooth kit.

Important: Operating the engine with blocked screens, dirty or plugged cooling fins, and/or cooling shrouds removed will result in engine damage from overheating.

1. Park the machine on a level surface, engage the parking brake (if applicable), and lower the grinder.

2. Shut off the engine, remove the key, and wait for the engine to cool.

3. Wipe away debris from the air cleaner.

4. Clean any debris buildup on the engine and muffler with a brush or blower.

   Important: It is preferable to blow dirt out, rather than washing it out. If you use water, keep it away from electrical items and hydraulic valves. Do not use a high-pressure washer. High-pressure washing can damage the electrical system and hydraulic valves or deplete grease.

5. Clean debris from the oil cooler.