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Section 5:  Maintenance 

TROUBLESHOOTING

Before performing any corrections, refer to the appropriate information in this Manual, or in the Engine Owner’s Manual, for the
correct safety precautions and operating or maintenance procedures.  Contact your local authorized Engine Service Dealer for
engine service.  Contact your local authorized equipment dealer or the factory for all other service problems.

PROBLEM POSSIBLE 

CAUSE 

CORRECTION

Engine does 

1. Spark plug wire disconnected.

1. Reconnect wire.

not start.

2. Engine Throttle Control Lever incorrectly set.

2. Put lever in START position.

3. Fuel tank empty.

3. Add fuel.

4. Choke control (if so equipped) in incorrect position.

4. See Engine Owner’s Manual.

5. Stale gasoline.

5. Drain fuel and add fresh fuel.

6. Dirty air filter(s).

6. Clean or replace filter(s).

7. Defective or incorrectly gapped spark plug.

7. Inspect spark plug.

8. Carburetor out of adjustment.

8. See Engine Service Dealer.

9. Misadjusted throttle control cable.

9. See Engine Service Dealer

10.Dirt or water in fuel tank.

10. See Engine Service Dealer.

Engine runs poorly.

1. Defective or incorrectly gapped spark plug.

1. Inspect spark plug (see Engine Owner’s Manual).

2. Dirty air filter(s).

2. Clean or replace (see Engine Owner’s Manual).

3. Carburetor out of adjustment.

3. See Engine Service Dealer.

4. Stale gasoline.

4. Replace with fresh gasoline.

5. Dirt or water in fuel tank.

5. See Engine Service Dealer.

6. Engine cooling system clogged.

6. Clean air cooling system (see Engine Owner’s Manual).

Engine overheats.

1. Engine cooling system clogged.

1. Clean air cooling area (see Engine Owner’s Manual).

2. Carburetor out of adjustment.

2. See Engine Service Dealer.

3. Oil level is low.

3. Check oil level (see Engine Owner’s Manual).

Engine does not 
shut off.

1. Misadjusted throttle control or ignition switch.

1. See Engine Owner’s Manual or Engine Service Dealer.

Wheels and Tines

1. Improper use of controls.

1. Review Sections 3 and 4.

will not turn.

2. Worn, broken, or misadjusted drive belt(s).

2. See “Checking Drive Belt Tension,” Section 5.

3. Internal transmission wear or damage.

3 Contact local dealer or the factory.

4. Bolt loose in transmission pulley.

4. Tighten bolt.

Tines turn, but 

1. Wheel Drive Pins not in WHEEL DRIVE.

1. See “Wheel Drive Pins” in Section 3.

wheels don’t.

2. Internal transmission wear or damage.

2. Contact local Dealer or the Factory.

Wheels Turn, but 

1. Tine holder mounting hardware missing.

1. Replace hardware.

Tines Don’t.

2. Internal transmission wear or damage.

2. Contact local Dealer or the Factory.

Poor tilling 

1. Worn tines.

1. See “Tines” (Section 5).

performance.

2. Improper Depth Regulator setting.

2. See “Tilling Tips & Techniques,” Section 4.

3. Incorrect throttle setting.

3. See Section 4.

4. Forward Drive Belt slipping.

4. See “Checking Forward Drive Belt Tension,” Section 5.

Summary of Contents for 644H-Bronco, 645A-Bronco

Page 1: ...er by the operator In the State of California the above is required by law Section 4442 of the California Public Resources Code Other states may have similar laws Federal laws apply on federal lands A spark arrester for the muffler is available by contacting the service department at Troy Bilt LLC P O Box 361131 Cleveland Ohio 44136 0019 IMPORTANT READ SAFETY RULES AND INSTRUCTIONS CAREFULLY TROY ...

Page 2: ...n seek help from the experts Choose from the options below Visit troy bilt com for many useful suggestions Click on Customer Support button and you will get the four options reproduced here Click on the appropriate button and help is immediately available If you prefer to reach a Customer Support Representative please call 1 800 520 5520 The engine manufacturer is responsible for all engine relate...

Page 3: ...dissipated 7 Never make adjustments when engine is running unless recommended by manufacturer Operation 1 Do not put hands or feet near or under rotating parts The tines begin to rotate once the engine starts and the Forward Clutch Bail or Reverse Clutch Control is engaged 2 Exercise extreme caution when on or crossing gravel drives walks or roads Stay alert for hidden hazards or traffic Do not ca...

Page 4: ...at care when backing up 17 Do not operate the tiller on a slope that is too steep for safety When on slopes slow down and make sure you have good footing Never permit the tiller to freewheel down slopes 18 Never allow bystanders near the unit 19 Only use attachments and acces sories that are approved by the manufac turer of the tiller 20 Use tiller attachments and acces sories when recommended 21 ...

Page 5: ...ngine Figure 1 Location of Safety and Operating Decals Model 644H shown TO AVOID SERIOUS INJURY READ THE OWNER S MANUAL KNOW LOCATIONS AND FUNCTIONS OF ALL CONTROLS KEEP ALL SAFETY DEVICES AND SHIELDS IN PLACE AND WORKING NEVER ALLOW CHILDREN OR UNINSTRUCTED ADULTS TO OPERATE TILLER SHUT OFF ENGINE AND DISCONNECT SPARK PLUG WIRE BEFORE MANUALLY UNCLOG GING TINES OR MAKING REPAIRS KEEP BYSTANDERS A...

Page 6: ...reful not to severely bend any of the control cables on the unit 3 Remove all unassembled parts and the separate hardware bag from the carton Check that you have the items listed below contact your local dealer or the factory if any items are missing or damaged NOTE Use the screw length template Fig 2 1 to identify screws Loose Parts List Qty Description 1 Handlebar Support see A Fig 2 2 page 7 1 ...

Page 7: ...ll not move loosen attaching screw J and nut IMPORTANT The support brackets must be assembled to the outside of the handlebar assembly 4 Tighten all handlebar mounting hardware securely STEP 3 Move Tiller Off Shipping Platform To move the tiller without the engine running put the wheels in their FREEWHEEL position as described below 1 Use a sturdy block to raise one wheel off the ground 2 Remove t...

Page 8: ...you must make an adjustment to the cable tension as described in Checking and Adjusting Forward Drive Belt Tension in Section 5 When the spring length is correct tighten the hex nut Z against the cable adjuster X STEP 5 Install Reverse Clutch Cable 1 Unwrap the reverse clutch cable the cable with a knob and a large hex nut attached to it from around its shipping position and route the cable CC Fig...

Page 9: ...mis sion Gear Oil Level in Section 5 STEP 7 Add Motor Oil to Engine The tiller is shipped without oil in the engine IMPORTANT Do not start the engine without first adding motor oil Severe engine damage will result if the engine is run without oil 1 Refer to the Engine Owner s Manual supplied with tiller for engine oil specifi cations and capacities 2 With the tiller on level ground pull the Depth ...

Page 10: ... the engine is running Always put both wheels in the WHEEL DRIVE position before starting the engine Failure to comply could cause loss of tiller control property damage or personal injury WARNING Do not place the tiller on its side when changing the wheel drive positions as doing so could result in gasoline leaking from the fuel tank Failure to follow this instruc tion could result in personal in...

Page 11: ...everse Clutch Control The Reverse Clutch Control F Figure 3 4 controls the engagement of reverse drive to the wheels and tines This powered reversing feature is used for maneuvering the tiller only never engage the tines in the ground while going in the reverse direction To Operate the Reverse Clutch Control 1 Operate only when the wheels are in the WHEEL DRIVE position see the WARNING statement a...

Page 12: ...i Reverse Stake This stake is located at the rear of the transmission under the tine hood see H Figure 3 7 Its purpose is to automati cally help prevent the counter rotating tines from letting the tiller back up in the direction of the operator if the tiller wheels had been inadvertently left in the FREEWHEEL position In this situation the Anti Reverse Stake will be forced down into the ground lif...

Page 13: ... operation 4 Check transmission gear oil level after first 2 hours of operation STARTING AND STOPPING THE ENGINE Pre Start Checklist Make the following checks and perform the following services before starting the engine 1 Read the Safety and Controls sections in this manual Read the separate Engine Owner s Manual provided by the engine manufacturer 2 Check that the wheels are in the WHEEL DRIVE p...

Page 14: ...WHEEL DRIVE position Never have the wheels in the FREEWHEEL position when the engine is running When the wheels are in FREEWHEEL they do not hold back the tiller and the tines could propel the tiller rapidly backward Before starting engine put Forward Clutch Bail all Models and Reverse Clutch Control in neutral disen gaged positions by releasing levers Never run engine indoors or in enclosed poorl...

Page 15: ...ure 4 5 After completing the turn slowly lower the tines into the soil to resume tilling Turning the Tiller Around Figure 4 3 Raise tines off ground and look behind when moving in reverse Figure 4 4 To begin turn lift handlebars until engine and tines are balanced over wheels Be sure tines are out of ground Figure 4 5 With tiller balanced over wheels and tines out of the ground push handlebars sid...

Page 16: ...large hard clumps of soil that can interfere with planting If time permits wait a day or two after heavy rains to allow the soil to dry before tilling Test soil by squeezing it into a ball If it compresses too easily it is too wet to till Avoid making footprints Whenever possible walk on the untilled side of the unit to avoid making foot prints in your freshly tilled or cultivated soil Footprints ...

Page 17: ...also leaves room for cultivating IMPORTANT When tilling on slopes be sure the correct oil level is maintained in the engine check every one half hour of operation The incline of the slope will cause the oil to slant away from its normal level and this can starve engine parts of required lubrication Keep the engine oil level at the full point at all times A Tilling up and down slopes To keep soil e...

Page 18: ... the vehicle s engine off and apply its parking brake When going up ramps stand in the normal operating position and push the tiller ahead of you Have a person at each side to turn the wheels WARNING Loading and unloading the tiller into or from a vehicle is potentially hazardous We don t recommend doing so unless absolutely necessary as this could result in person al injury or property damage How...

Page 19: ...essure in tires if pneumatic Service spark plug Check Anti Reverse Stake Change more frequently in dusty or dirty conditions Change after first 2 hours of break in operation Check after first 2 hours of break in operation See Engine Owner s Manual for service intervals and instructions WARNING Before inspecting cleaning or servicing the machine shut off engine wait for all moving parts to come to ...

Page 20: ...ing a viscosity of SAE 140 SAE 85W 140 or SAE 80W 90 If refilling an empty transmission use only GL 4 transmission gear oil having a viscosity of SAE 85W 140 or SAE 140 NOTE Do not use automatic transmission fluid or engine oil in the transmission 7 While checking frequently to avoid overfilling slowly add gear oil into the oil fill hole until it reaches the halfway point on the drive shaft 8 Secu...

Page 21: ...even spots or burrs from the tine shaft using fine sandpaper Then grease the tine shaft before rein stalling the tine assemblies Be sure all the cutting edges face so they will enter the soil first when the tiller is moving forward this means the cutting edge on the top of each tine faces toward the operator position Tighten hardware C Removing and Installing Individual Tines 1 Use two 9 16 box en...

Page 22: ...g A Figure 5 4 counterclock wise as viewed from the operator s position while holding the adjuster B steady to increase the length of the spring or turn clockwise as viewed from the operator s position to decrease the length of the spring NOTE If you have difficulty holding the adjuster steady by hand use a pliers or wrench on the adjuster While you turn the screw keep the Forward Clutch Cable Fig...

Page 23: ...possible Check belt tension after the first two hours of break in operation new belt Check belt tension after every 10 operating hours To Check Reverse Belt Tension 1 Be sure that the engine is stopped and the spark plug wire is disconnected and moved away from the spark plug 2 Remove the screw in the plastic belt cover and slide the cover which is attached to the forward clutch cable out of the w...

Page 24: ...y or dirty conditions Service the air cleaner as instructed in the separate Engine Owner s Manual SPARK PLUG SERVICE Inspect and clean or replace the spark plug after every 100 operating hours or annually Clean the plug and set the gap as described in the separate Engine Owner s Manual In some areas local law requires using resistor spark plugs to suppress ignition signals If the engine was origin...

Page 25: ...e Service Dealer 4 Stale gasoline 4 Replace with fresh gasoline 5 Dirt or water in fuel tank 5 See Engine Service Dealer 6 Engine cooling system clogged 6 Clean air cooling system see Engine Owner s Manual Engine overheats 1 Engine cooling system clogged 1 Clean air cooling area see Engine Owner s Manual 2 Carburetor out of adjustment 2 See Engine Service Dealer 3 Oil level is low 3 Check oil leve...

Page 26: ... commercial institutional industrial rental or demonstrator purposes the warranty COMMERCIAL on the tiller is limited in duration to 90 days from the date of purchase USE WARRANTY This warranty does not apply to parts that have been damaged by accident alteration misuse abuse neglect improper maintenance vandalism theft fire water or damage because of peril or other natural disaster HOW TO OBTAIN ...

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