FORM NO. 3323–395 Z–320 OUT FRONT Z Model No. 74191 – 895001 & Up Operator’s Manual IMPORTANT: Read this manual carefully. It contains information about your safety and the safety of others. Also become familiar with the controls and their proper use before you operate the product.
Introduction Thank you for purchasing a Toro product. All of us at Toro want you to be completely satisfied with your new product, so feel free to contact your local Authorized Service Dealer for help with service, genuine replacement parts, or other information you may require. Whenever you contact your Authorized Service Dealer or the factory, always know the model and serial numbers of your product.
Contents Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gasoline and Oil . . . . . . . . . . . . . . . . . . . . . . . . Recommended Gasoline . . . . . . . . . . . . . . . Stabilizer/Conditioner . . . . . . . . . . . . . . . . Filling the Fuel Tank . . . . . . . . . . . . . . . . . Check Engine Oil Level . . . . . . . . . . . . . . . Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Loose Parts . . . . . . . . . . . . . . . . . . . . . . . . .
Contents The enclosed Engine Owner’s Manual is supplied for information regarding The U.S. Environmental Protection Agency (EPA) and the California Emission Control Regulation of emission systems, maintenance and warranty. Keep this engine Owner’s Manual with your unit. Should this engine Owner’s Manual become damaged or illegible, replace immediately. Replacements may be ordered through the engine manufacturer.
Safety Safe Operation Practices for Ride-on (riding) Rotary Lawnmower Machines Preparation 1. While mowing, always wear substantial footwear and long trousers. Do not operate the equipment when barefoot or wearing open sandals. Training 2. Thoroughly inspect the area where the equipment is to be used and remove all objects which may be thrown by the machine. 3. WARNING – Petrol is highly flammable. 1. Read the instructions carefully.
Safety Operation 7. Watch out for traffic when crossing or near roadways. Do not operate the engine in a confined space where dangerous carbon monoxide fumes can collect. 8. Stop the blades rotating before crossing surfaces other than grass. 2. Mow only in daylight or in good artificial light. 9. 3. Before attempting to start the engine, disengage all blade attachment clutches and shift into neutral.
Safety 15. Stop the engine and disengage drive to attachment • before refuelling; • before removing the grass catcher; • before making height adjustment unless adjustment can be made from the operator’s position. 16. Reduce the throttle setting during engine run-out and, if the engine is provided with a shut-off valve, turn the fuel off at the conclusion of mowing. Maintenance and storage 1. Keep all nuts, bolts and screws tight to be sure the equipment is in safe working condition. 2.
Safety Slope Chart Read all safety instructions on pages 3–10.
Safety 7
Safety Symbols Glossary Safety alert triangle– symbol within triangle indicates a hazard Fire, open light & smoking prohibited Safety alert symbol Fire or open flame Explosion Read operator’s manual Consult technical manual for proper service procedures Keep children away from battery Shut off engine & remove key before preforming maintenance or repair work Do not dispose of lead battery in garbage Caustic liquids, chemical burns to fingers or hand Stay a safe distance from the machine Caution,
Safety Symbols Glossary Do not open or remove safety shields while engine is running Stored energy hazard, kickback or upward motion Thrown or flying objects, whole body exposure Dismemberment, rider backing Thrown or flying objects, whole body exposure Keep guards and safety sheilds in place Do not carry passengers Dismemberment, Out Front Z in forward motion Severing of toes & fingers, rotary mower blade Machine rollover, Out Front Z Hand & arm engagement, belt drive Machine rollover, do not u
Safety Symbols Glossary Fast Slow Brake system Parking brake Decreasing/Increasing Battery On/Run Oil Lubrication Point Off/stop Power take off (PTO) Engine start Engage Engine run Disengage Engine stop Elapsed Operating Hours Choke 10 Alarm
Gasoline and Oil Recommended Gasoline Use UNLEADED Regular Gasoline suitable for automotive use (85 pump octane minimum). Leaded regular gasoline may be used if unleaded regular is not available. IMPORTANT: Never use methanol, gasoline containing methanol, or gasohol containing more than 10% ethanol because the fuel system could be damaged. Do not mix oil with gasoline. POTENTIAL HAZARD • In certain conditions gasoline is extremely flammable and highly explosive.
Gasoline and Oil Stabilizer/Conditioner Filling the Fuel Tank Add the correct amount of gas stabilizer/conditioner to the gas. Using a stabilizer/conditioner in the machine: 1. Shut the engine off and set the parking brake. 2. Clean around the fuel tank cap and remove the cap. Add unleaded regular gasoline until the level is to the bottom of the filler neck. Do not fill the neck completely full, this space in the tank allows gasoline to expand. 3. Install fuel tank cap securely.
Assembly Loose Parts Note: Use the chart below to verify all parts have been shipped. DESCRIPTION QTY.
Assembly Install Castor Wheel Check Tire Pressure 1. Remove nut, washers, spacer and axle shaft from fork (Fig. 1). Check the air pressure in all tires: refer to Tire Pressure in Maintenance section on page 42. 2. Jack up rear of unit and install rear wheel into castor fork (Fig. 1). 3. Place wheel with spacer installed and washers between fork and slide bolt through bearings (Fig. 1). 4. Secure bolt with 1/2” locknut (Fig. 1). 5. Torque nut to 75 ft–lb (55 N⋅m). 6.
Assembly Activate the Battery 1 Bulk electrolyte with 1.260 specific gravity must be purchased from a local battery supply outlet. 1. Remove the battery from the machine. IMPORTANT: Be careful not to damage the long vent tube when removing the battery box. 2 3 m–1262 POTENTIAL HAZARD • Battery electrolyte contains sulfuric acid which is a deadly poison and it causes severe burns. Figure 2 1. Filler caps 2. Electrolyte 3.
Assembly 3. Leave the covers off and connect a 3 to 4 amp battery charger to the battery posts (Fig. 3). Charge the battery at a rate of 4 amperes or less for 4 hours (12 volts). Install Battery 1. Fill battery with electrolyte and charge, refer to BATTERY, page 50. 2. Position battery in tray with terminal posts toward the engine (Fig. 4). 3. Slide the red terminal boot onto the red battery cable. 4.
Assembly Install Recycler Baffles Recycler Operation 1. Tilt mower into the vertical position, refer to; Tilting the Mower, page 27. When operating the mower with Recycler baffles installed you must disengage the blower drive belt. 2. Remove cap screws, left and right bagger baffles locknuts, carriage bolts, and left and right discharge baffles from the mower (Fig. 7). 1. Stop the engine, remove the key and disconnect the spark plug wire(s) from the spark plug(s). 2.
Assembly Install Bagger and Discharge Baffles Bagger Operation When operating the mower with bagger baffles installed you must engage the blower drive belt. When changing between bagging and recycling, baffles must be removed and replaced 1. 2. Tilt mower into the vertical position, refer to; Tilting the Mower, page 27. Remove capscrews ,locknuts, carriage bolts and Recycler baffles from the mower (Fig. 5). Note: 3. 4. Save all hardware for use when installing Recycler baffles.
Operation Think Safety First Controls Please carefully read all the safety instructions on pages 3–8. Knowing this information could help you, your family, pets or bystanders avoid injury. Become familiar with all the controls before you start the engine and operate the machine (Fig. 1). 1 2 POTENTIAL HAZARD • Loud sounds can cause ear damage and loss of hearing. 3 WHAT CAN HAPPEN • Ear damage or hearing loss may occur. 5 HOW TO AVOID THE HAZARD • Wear ear protection when operating this machine.
Operation Parking Brake Always set the parking brake when you stop the machine or leave it unattended. Setting the Parking Brake 1. Move the motion control levers to neutral (Fig. 1). 2. Pull up on the parking brake lever to set the parking brake (Fig. 2). The parking brake lever should stay firmly in the “SET” position. Releasing the Parking Brake 1. Push in on the button and lower parking brake lever to “OFF” (Fig. 2). 1 2 3 m–3287 Figure 2 1. Parking brake–SET 2. Button 20 3.
Operation Starting and Stopping Engine 2 1 Starting 1. Sit down on the seat and set the parking brake; refer to Setting the Parking Brake, page 20. 2. Move the motion control levers to neutral. 3. Move the PTO (power take off) to “OFF” (Fig. 3). 4. Move the throttle control midway between “SLOW” and “FAST” positions before starting a cold engine. 5. Move the choke control to “ON” position before starting a cold engine. Note: 6.
Operation Stopping 1. Move the throttle lever to “SLOW” (Fig. 5). 2. Set the parking brake. 3. Turn the ignition key to “OFF” (Fig. 6). Note: 4. 5. If the engine has been working hard or is hot, let it idle for a minute before turning the ignition key “OFF.” This helps cool the engine before it is stopped. In an emergency, the engine may be stopped by turning the ignition key to “OFF.
Operation The Safety Interlock System 4. “SET” the parking brake, move power take off (PTO) to “OFF” and hold the motion control levers in neutral. Now start the engine. While the engine is running, move the motion control levers forward or reverse; the engine should stop. 5. Tilt the hopper up, “SET” the parking brake, move power take off (PTO) to “OFF” and hold the motion control levers in neutral. Now start the engine.
Operation Driving Forward or Backward 5 The throttle control regulates the engine speed as measured in rpm (revolutions per minute). Place the throttle control in the “FAST” position for best attachment performance. Always operate in the full throttle position when operating attachments. 4 5 2 2 1 1 3 3 5 4 5 Forward m–3288 1. Release the parking brake; refer to Setting the Parking Brake, page 20. 2. To go forward, slowly push the motion control levers forward (Fig. 9).
Operation Backward 1. Release the parking brake; refer to Setting the Parking Brake, page 20. 2. To go backward, slowly pull the motion control levers rearward (Fig. 9). To go straight, move both motion control levers the same distance (Fig. 9). Positioning the Seat The seat can move forward and backward. Position the seat where you have the best control of the machine and are most comfortable. 1. To adjust, remove the locknut and washer, and tip seat forward (Fig. 10).
Operation Adjusting Height-of-Cut Adjusting Rollers The height-of-cut is adjusted from 1” to 4-1/2” (25 to 115 mm) in 1/2” (13 mm) increments by relocating four clevis pins in different hole locations. The rollers are preset for heights-of-cut above 2” (51 mm) If the height-of-cut is set to the 1”or 1–1/2” (25 mm or 39 mm) the rollers must be adjusted to the upper hole location. 1. 2. 3. To adjust, remove hairpin cotter and clevis pin from mower hanger bracket (Fig. 17).
Operation Tilting the Mower The mower can be tilted up for ease of service or to shorten unit length for transport and storage. 1 To Raise Mower 1. Lift or push down on side of carrier frame to release weight on latch pin. 2. Pull out on latch pin to release and rotate into notch to hold in the open position (Fig. 14). Repeat on the other side. Lower rear of mower onto rollers. m–3375 3. Figure 15 1. Mower up Rotate latch pins into released position after deck has been lowered onto rear rollers.
Operation To Lower Mower Dumping the Hopper 1. Pull out latch pins and rotate into notch to hold in the open position (Fig. 14). 2. Standing in front of the mower, pull forward on front and lower mower (Fig. 15). 3. 4. Rotate latch pins into released position and lift on side of carrier frame until latch pin engages (Fig. 14). Repeat on the other side. The hopper is equipped with a “hopper full” sensor that checks for a full condition. When the alarm buzzer sounds the hopper needs to be emptied.
Operation Pushing the Machine by Hand IMPORTANT: Always push the machine by hand. Never tow the machine because hydraulic damage may occur. To Push the Machine 1. Disengage the power take off (PTO) and turn the ignition key to “OFF” to stop the engine. 2. Rotate pump by-pass valves counterclockwise 2 turns to push. This allows hydraulic fluid to by-pass the pump enabling the wheels to turn (Fig. 18).
Maintenance Service Interval Chart Service Operation Each Use 8 Hours Hydraulic fluid–check level Initial X Oil—check level 25 Hours 50 Hours 100 Hours 200 Hours X X Oil—change* X Initial X Oil Filter–change (200 hours or every other oil change) Hydraulic filter–change Initial Safety System—check X Hopper – clean X X X X X X X X X Screens – clean (as required) Mower Housing – clean Storage Service X X X X Cutting Blades – check X X Chassis—grease* X X Drive Shaft—greas
Maintenance POTENTIAL HAZARD • If you leave the key in the ignition switch, someone could start the engine. WHAT CAN HAPPEN • Accidental starting of the engine could seriously injure you or other bystanders. HOW TO AVOID THE HAZARD • Remove the key from the ignition switch and pull the wire(s) off the spark plug(s) before you do any maintenance. Also push the wire(s) aside so it does not accidentally contact the spark plug(s).
Maintenance 3. Carefully slide the foam element off the paper element (Fig. 19). 4. Unscrew the cover nut and remove the cover and paper element (Fig. 19). 1 Cleaning the Foam and Paper Elements 1. Foam Element 2 A. Wash the foam element in liquid soap and warm water. When the element is clean, rinse it thoroughly. m–1213 Figure 21 B. Dry the element by squeezing it in a clean cloth (do not wring). 1. Paper element C. Put one or two ounces of oil on the element (Fig. 20).
Maintenance Checking Oil Level Engine Oil Change oil: • After the first 5 operating hours. • After every 100 operating hours. Note: 1. Park the machine on a level surface, disengage the power take off (PTO) and turn the ignition key to “OFF” to stop the engine. Remove the key. 2. Clean around the oil dipstick (Fig. 22) so dirt cannot fall into the filler hole and damage the engine. 3. Unscrew the oil dipstick and wipe the metal end clean (Fig. 22). 4.
Maintenance Changing/Draining Oil Change Oil Filter 1. Start the engine and let it run five minutes. This warms the oil so it drains better. Replace the oil filter every 200 hours or every other oil change. 2. Park the machine so that the drain side is slightly lower than the opposite side to assure the oil drains completely. Then disengage the power take off (PTO), set the parking brake, and turn the ignition key to “OFF” to stop the engine. Remove the key.
Maintenance Checking the Spark Plug Spark Plug Check the spark plug(s) after every 200 operating hours. Make sure 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. 1. IMPORTANT: Never clean the spark plug(s).
Maintenance Greasing and Lubrication 2. Grease the fittings on drive shaft and universal joints (Fig. 28). The unit must be lubricated regularly. Refer to the Service Interval Chart on page 30. Grease Type: No. 2 general purpose lithium base or molybdenum base grease. How to Grease 1. Disengage the power take off (PTO) and turn the ignition key to “OFF” to stop the engine. Remove the key. 2. Clean the grease fittings with a rag. Make sure to scrape any paint off the front of the fitting(s).
Maintenance Gearbox Fluid 4. With deck raised, remove plug on the bottom side of the gearbox. Let fluid fully drain into a pan. (Fig. 32). 5. Reinstall the bottom plug into the gearbox (Fig. 32). 6. Remove the top plug to fill gearbox (Fig. 32). 7. Fill gearbox with 5–1/2 (129.6 ml) ounces of automatic transmission fluid (Dexron III or equivalent). 8. Reinstall the top plug into the gearbox (Fig. 32). 9. Repeat for remaining gearboxes. Change fluid: • After initial 100 operating hours.
Maintenance Checking Gearbox Fluid The gearbox fluid must be checked after every 100 operating hours. Check all three gearboxes. 1. Warm the fluid in gearbox. Run the mower deck for a few minutes. 2. Raise deck to upright position. 3. Remove plug on the side of the gearbox. The fluid level must be up to side hole in gearbox (Fig. 32). 4. If needed, fill automatic transmission fluid (Dexron III or equivalent) into top hole until it runs out the side hole in gearbox.
Maintenance 4. Insert a pin punch into the mounting tube and carefully drive out the bushings (Fig. 34). Clean the inside of the mounting tube. Servicing the Castor Wheels and Bearings 5. Grease the inside and outside of the new bushings. Use a hammer and flat plate to carefully drive the bushings into the mounting tube (Fig. 34). 6. Inspect the castor wheel fork for wear and replace if necessary (Fig. 33). The castor wheels rotate on a roller bearing supported by a spanner bushing.
Maintenance 5. To assemble, place one (1) bushing into the wheel hub. Grease the roller bearing and spanner bushing and slide them into the wheel hub. Place the second bushing into the wheel hub (Fig. 35). 6. Install the castor wheel into the castor fork and secure with the wheel bolt and locknut. Tighten the locknut until the spanner bushing bottoms against the inside of the castor forks (Fig. 35). 7.
Maintenance 4. Insert a pin punch into the push arm and carefully drive out the bushings (Fig. 37). Clean the inside of the push arm. 5. Use a hammer and flat plate to carefully drive new bushings into the end of push arm (Fig. 37). 6. Place push arm onto carrier frame pin and secure with 1-1/2” (38 mm) flat washer and retaining ring (Fig 36). 7. Grease the fitting on the push arm using No. 2 general purpose lithium base or molybdenum base grease.
Maintenance 4. Install screen from rear and raise over oil cooler. Secure with previously removed hardware (Fig. 38). 3 1 Fuel Filter Replace the fuel filter after every 200 operating hours or yearly, whichever occurs first. 3 Replacing the Fuel Filter ÑÑÑÑÑÑÑÑ ÑÑÑÑÑÑÑÑ ÑÑÑÑÑÑÑÑ Never install a dirty filter if it is removed from the fuel line. 1. Disengage the power take off (PTO), set the parking brake, and turn the ignition key to “OFF” to stop the engine. Remove the key. 2.
Maintenance Fuel Tank 4 Draining The Fuel Tank POTENTIAL HAZARD • In certain conditions gasoline is extremely flammable and highly explosive. WHAT CAN HAPPEN • A fire or explosion from gasoline can burn you, others, and cause property damage. HOW TO AVOID THE HAZARD • Drain gasoline from the fuel tank when the engine is cold. Do this outdoors in an open area. Wipe up any gasoline that spills. • Never drain gasoline near an open flame or where gasoline fumes may be ignited by a spark.
Maintenance 5. Install cap on filler neck. 1 2 1 3 m–3291 Figure 43 m–3292 Figure 42 1. Hydraulic reservoir cap 2. Screen 3. Fluid level-Full Replacing the Hydraulic Filter Change the hydraulic filter: • After the first 8 operating hours. • After every 200 operating hours. 1. Position machine on a level surface, stop the engine, and remove key from ignition switch. IMPORTANT: Do not substitute automotive oil filter or severe hydraulic system damage may result. 2. 3. 44 1.
Maintenance 1 3 POTENTIAL HAZARD • Hydraulic fluid escaping under pressure can penetrate skin and cause injury. 2 WHAT CAN HAPPEN • Fluid accidentally injected into the skin must be surgically removed within a few hours by a doctor familiar with this form of injury or gangrene may result. m–1256 Figure 44 1. Hydraulic filter 2. Gasket HOW TO AVOID THE HAZARD • Keep body and hands away from pin hole leaks or nozzles that eject high pressure hydraulic fluid.
Maintenance 4. Rotate control rod 1 turn, to lengthen rod, and tighten jam nuts (Fig. 45). IMPORTANT: Motion control lever must contact forward stop before pump contacts internal stop or pump damage may occur. 5. If motion control levers do not line up in neutral, identify control rod of handle closer to the seat. Rotate to lengthen this control rod a little. Tighten jam nuts.
Maintenance Replacing Power Take Off (PTO) Belts Check power take off (PTO) belts for wear after every 50 hours of operation. 4 3 2 1. Hold spring loaded idler against belts and pull spring down to remove from lower bolt mount (Fig. 47). 2. Lower idler to relax tension on PTO belts and remove belts from gear box pulley (Fig. 47). 3. Remove clutch stop mounting bolts and unplug clutch wire harness (Fig. 47). Remove belts over clutch. m–3727 1 Figure 46 1. Reference speed bolt 2. Eye bolt 4 3.
Maintenance 4. 5. Install new PTO belts over clutch and route around gearbox pulleys and above spring loaded idler (Fig. 48). Hold spring loaded idler against belts and pull spring down to install on lower bolt mount (Fig. 47). 6. Install clutch stop (Fig. 47). Tighten mounting bolts securely. 7. Plug clutch wire into wire harness. 1 2 3 Replacing the Traction Belt Check traction drive belt for wear after every 50 hours of operation. 1.
Maintenance Replacing the Blower Belt Fuse Squealing when the belt is rotating, blower slipping causing frequent clogging of chute and blower, frayed belt edges, burn marks and cracks are all signs of a worn blower belt. Replace the blower belt if any of these conditions are evident. Service Interval/Specification 1. Stop the engine, remove the key and disconnect the spark plug wire(s) from the spark plug(s). Fuse: 2.
Maintenance Battery Check the electrolyte level in the battery every 8 hours. 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 four parts water and one part baking soda. Apply a light coating of grease to the battery terminals to prevent corrosion. IMPORTANT: Do not overfill the battery because electrolyte (sulfuric acid) can cause severe corrosion and damage to the chassis. 4.
Maintenance Cleaning Hopper Screens For best clipping collection, maximum air flow through the hopper is required. To provide maximum air flow, the hopper screens must be kept clean. 1. To clean the hopper screens dump the hopper to remove grass clippings. 2. With the door open, remove the knobs at the upper front of the hopper and slide the screens out the rear of the hopper (Fig. 53). 3. 4.
Maintenance Cutting Blades To ensure a superior quality of cut, keep the blades sharp. For convenient sharpening and replacement, you may want to keep extra blades on hand. POTENTIAL HAZARD • A blade that is worn or damaged could break apart and pieces could be thrown at bystanders or at you as you use the mower. Inspecting the Blades 1. Inspect the cutting edges (Fig 55). If the edges are not sharp or have nicks, remove and sharpen the blades. Refer to Sharpening the Blades on page 54. 2.
Maintenance Checking for Bent Blades 1. 2. Rotate the blades until the ends face forward and backward (Fig. 56). Measure from a level surface to the cutting edge of the blades (Fig. 56). Note this dimension. Rotate the opposite ends of the blades forward. Measure from a level surface to the cutting edge of the blades at the same position as in step 1 above. The difference between the dimensions obtained in steps 1 and 2 must not exceed 1/8” (3 mm).
Maintenance Sharpening the Blades 1. 1 Use a file to sharpen the cutting edge at both ends of the blade (Fig. 59). Maintain the original angle. The blade retains its balance if the same amount of material is removed from both cutting edges. m–3372 Figure 57 1 1. Cutting edge 1. Install the blade onto the blade retainer and secure with retainer bolt, spacer and washer (Fig. 53).
Maintenance Correcting Cutting Unit Mismatch If one cutter blade cuts lower than the other, correct as follows: 1. Stop the engine, remove the key and disconnect the spark plug wire(s) from the spark plug(s). 2. Adjust the tire pressure in all tires to specifications and check that the blades are not bent. Refer to Checking for Bent Blades on page 53. 3. Set the height-of-cut to the 2-1/2” position. Refer to Adjusting the Height-Of-Cut in the Operation section.
Maintenance Setting the Side-to-Side Leveling 1. Check the tire pressure on both deck and traction unit. 2. Position the blades side-to-side (Fig.63 ). Measure at “A” and “B” locations (Fig. 63) from a level surface to the cutting edge of blade tips (Fig.64). 3. The difference between measurements “A” and “B” should be no more than 1/4” (6 mm). m–3372 Figure 63 Figure 64 56 m–3372 4.
)/..*)2/1 ('1++*1 02,/.'- "&& )/..*)2/1 02,/.
58 Maintenance Hydraulic Diagram
Maintenance Cleaning and Storage 12. Check the tire pressure; refer to Tire Pressure, page 42. 1. 13. Charge the battery; refer to Battery page 50. 2. Disengage the power take off (PTO), set the parking brake and turn the ignition key to “OFF” to stop the engine. Remove the key. Remove grass clippings, dirt, and grime from the external parts of the entire machine, especially the engine. Clean dirt and chaff from the outside of the engine’s cylinder head fins and blower housing. 3.
Troubleshooting PROBLEM Starter does not crank Engine g will not start,, starts hard,, or f il to fails t keep k running. i Engine g loses power. p 60 POSSIBLE CAUSES CORRECTIVE ACTION 1. Power take off (PTO) is ENGAGED. 1. Move power take off (PTO) to DISENGAGED. 2. Parking brake is not on. 2. Set parking brake. 3. Motion control levers are not in neutral. 3. Move motion control levers into neutral. 4. Battery is dead. 4. Charge the battery. 5.
Troubleshooting PROBLEM Engine g overheats. Abnormal vibration. Machine does not drive. POSSIBLE CAUSES CORRECTIVE ACTION 1. Engine load is excessive. 1. Reduce ground speed. 2. Oil level in crankcase is low. 2. Add oil to crankcase. 3. Cooling fins and air passages under engine blower housing are plugged. 3. Remove obstruction from cooling fins and air passages. 1. Engine mounting bolts are loose. 1. Tighten engine mounting bolts. 2.