Stow STR46SP manual Drive System Theory of Operation

Page 32

Drive System Theory of Operation

The STR46SP Ride-On Power Trowel is equipped with a "Torque Converter"whichsuppliestorquetoboththeleftandrightgearboxes.

The function of the torque converter is to automatically deliver the correct amount of torque required by the trowel under all load conditions.This enables the trowel to deliver the necessary torque for float pan applications and the high rotor speeds required for burnishing concrete.

The torque converter used in the STR46 SERIES Ride-On Power Trowel is a variable pitch pulley type (Figure 22) connected by a drive belt.

Fig. 22 Torque Converter/Variable Pitch Pulley

Drive Pulley

The "Drive Pulley" uses centrifugal force (Figures 23 and 24) to create a belt squeeze force transmitted at the pulley faces. This condition functions as an automatic clutch and transmission.

 

 

TRI

 

 

 

N

FU

G

 

E

 

 

 

C

 

 

 

A

L

 

 

 

 

 

F

 

 

 

 

 

O

 

 

 

 

 

R

 

 

 

 

 

C

 

 

 

 

 

E

FIXED

FACE

VARIABLE

FACE

 

SQUEEZE

 

BELT

FORCE

DRIVE PULLEY

 

 

(TORQUE CONVERTER)

STR46SP — MAINTENANCE

Centrifugal force pushes the roller arms against the ramp plate, forcing the moveable face toward fixed face squeezing the belt. (see Figure 24 below)

CENTRIFUGAL FORCE

DISTANCE

DRIVE

LOW OUTPUT

SPEED

MOVEABLE FACE

MOVEABLE

PULLEY

 

 

IS CONTROLLED

FACE

 

 

 

 

BY A SPRING

TRAVELS

 

 

 

 

AND BELT TENSION

 

LOW ENGINE RPM

 

 

 

DRIVEN PULLEY

MOVABLE FACE IS

HIGH OUTPUT

CONTROLLED BY

DRIVE

SPEED

ROLLER WEIGHT ARMS

PULLEY

 

AND SPRINGS

HIGH ENGINE RPM

DRIVEN PULLEY

Fig. 24. Pulley Interaction

The"VariablePitchPulleys"haveonefixedface,andonemoveable face.The drive pulley ( torque converter, Figure 25) moveable face is controlled by roller weight arms and springs, which change position according to engine speed.The driven pulley moveable face is controlled by a spring and belt tension.

DRIVE PULLEY

RAMP

PLATE

BUSHING

SPRING

ROLLER ARM

WEIGHT

Fig. 25. Variable Pitch Pulley

A

B

C

DRIVE

 

 

 

PULLEY

DRIVEN

PULLEY

NEUTRAL LOW SPEED HIGH SPEED

Figure 23. Torque Converter (Centrifugal Force)

Figure 26. Pulley Conditions

 

 

STR46SP • RIDE-ON POWER TROWEL — OPERATION MANUAL — REV. #1 (08/01/06) — PAGE 32

 

 

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Contents
STR46SP Page Silicosis Warning STR46SP -TABLE of Contents STR46SP Parts Ordering Procedures Wilmington Ave Carson, CASTR46SP Training Checklist Machine layout, location of components, checking of engineSTR46SP Daily PRE-OPERATION Checklist Daily PRE-OPERATION ChecklistSTR46SP Safety Message Alert Symbols You can be Injured if you do not follow these directionsAlways wear approved respiratory protection Always wear approved eye and hearing protectionDo not operate or service this Fatigue, illness or taking medicineLifting the Ride-On Trowel STR46SP Rules for Safe OperationAlways keep the work area well organized Towing Safety Precautions Secure portable power cables in cable tray with tie wrapsBattery Always keep the battery charged. IfAlways know the location of the nearest first aid kit Maintenance SafetyEmergencies STR46SP Operation and Safety Decals Machine Safety DecalsSTR46SP Specifications Trowel TBDSTR46SP Specifications Engine STR46 Engine SpecificationsSTR46SP General Information STR46SP Controls and Indicators STR46SP Controls and Indicators STR46SP Basic Engine Kohler 27 HP EngineMuffler Used to reduce noise and emissions Oil Filler Cap Remove to add engine oilTrowel Pre-Set Up Instructions Control Handle AssemblySeat Assembly Battery SetupGearbox Oil Level STR46SP Initial START-UPEngine Oil Level Always check engine oil Before Each USE STR46SP Operation Fuel Gauge Important Information Before You StartSteering Left and Right Control LeversMaintenance Daily 8-10 HoursWeekly 30-40 Hours Monthly 100-125 HoursReinstall the air cleaner cover and secure the latches STR46SP MaintenanceAir Cleaner Daily Air Cleaner Components to Check Disassembly and Reassembly Standard TypeMake sure the cooling shrouds are reinstalled Make sure the correct depth air STR46SP Maintenance Have a 3/4 X 1 X 3-1/4 inch wooden block available Checking The Drive BeltRemoving the Drive Belt Wooden Block Reinstall the spare belt carrier and the drive belt guardInstalling the Drive Belt Using Replacement Drive Belt Spare Drive Belt Replacement Drive System Theory of Operation Torque Converter/Variable Pitch Pulley Drive PulleyHow It Works Figure Condition a z Engine Idling ClutchBlade Pitch Matching Blade Pitch for Both Sets of BladesTrowel Arm adjustment Procedure Stabilizer Ring RemovalTrowel Arm Removal Remove the trowel arm from the spider plateTrowel Blade Removal Spider Plate Hex Head Bolt Zerk FittingTrowel Arm Adjustment Checking Trowel Arm StraightnessTrowel Arm Adjustment Setup Re-AssemblyInstalling Pans Onto Finisher Blades Decommissioning Trowel/ComponentsSTR46SP -TROUBLESHOOTING Engine Power Engine LacksEngine Overheats Engine Will NotSTR46SP -TROUBLESHOOTING Trowel TroubleshootingSTR46SP -TROUBLESHOOTING Trowel STR46SP Notes STR46SP Explanation of Code in Remarks Column NO. ColumnPart NO. Column QTY. Column21495 282911903 11904STR46SP Nameplate and Decals Nameplate and DecalsDECAL, Spring Safety DECAL, Powder CoatedDECAL, Stow DECAL, AL Pitch RHSTR46SP Pivot ASSY. RIGHT/LEFT Pivot ASSY. RIGHT/LEFTWASHER, LOCK, 3/8 MED Rocker Block with BushingPIVOT, Double Rocker ARM, Pivot RightSTR46SP Steering Handles ASSY. RIGHT/LEFT Steering Handles ASSY. RIGHT/LEFTGRIP, Handle LT HANDLE, TubeHANDLE, STEERING, Lower SPACER, ROD ENDSTR46SP Steering Assist Control ASSY. RIGHT/LEFT Steering Assist Control ASSY. RIGHT/LEFTSteering Assist Assembly LEVER, Steering ControlSTR46SP Gearbox ASSY. Right Housing only SHAFT, Gearbox Input W/FANWASHER, FLAT, 1/4 SAE SHROUD, GB FIN COVER, RightSTR46SP Gearbox ASSY. Left SHROUD, GB FIN COVER, Left Left Hand WormFAN, Left CCW LEFT-SIDE FAN CoverSTR46SP Single Pitch Handle ASSY. RIGHT/LEFT Single Pitch Handle ASSY. RIGHT/LEFTCable Assembly Crank KnobSpacer Crank LeverSTR46SP Drive Assy Drive AssyGASKET, CV Joint Boot BOOT, CV JointPLATE, Bearing Mount KEY, Woodruff #9STR46SP ENGINE/MUFFLER/BELT Assy ENGINE/MUFFLER/BELT AssyNUT, Flange Muffler GASKET, Exhaust ManifoldSTUD, Exhaust SCREW, HEX FlangeSTR46SP AIR CLEANER/OIL FILTER/OILCOOLER Assy AIR CLEANER/OIL FILTER/COOLER AssyKNOB, AIR Cleaner Cover COVER, AIR CleanerCOVER, Inner AIR Cleaner ELEMENT, PRE-CLEANERSTR46SP -V-BELT COVER/OUTER Muffler Shield Assy Belt COVER/OUTER Muffler Shield AssyGUARD, Belt SHIELD, Muffler OuterGUARD, Belt Rear STR46SP Spider ASSY. Right Spider ASSY. RightScrew ASSEMBLY, ARM Retaining SCREW, Trowel AdjustmentAccessory Item PLATE, Wear Thrust CollarSTR46SP Spider ASSY. Left Spider ASSY, LeftSpider ASSY. Left SPRING, Left Trowel ARM LeverLEVER, Trowel ARM Left Side ARM, Trowel L.SSTR46SP -YOKE Assy Yoke AssyYoke PIN, YokeSTR46SP -THROTTLE CABLE/FOOT Pedals Assy Throttle CABLE/FOOT Pedals AssyCABLE, Control RT SPRING, Throttle ReturnROD END, 10 32 Female RH RISER, Left FootSTR46SP Control Panel Assy Control Panel AssySWITCH, Light Toggle BOOT, Toggle SwitchIgnition SWITCH, W/KEY HARNESS, Wire EngineSTR46SP Fuel Assy Fuel AssyTANK, Fuel Five Gallon Fuel CAP/GAUGEBUSHING, Rubber Fuel VALVE, Screened DapcoSTR46SP Battery Assy Battery AssyBOX, Battery GR UI Bracket Battery BOXWing NUT, Plated WASHER,LOCK, 1/4 MediumSTR46SP Seat Frame Assy Seat Frame AssyWIRE, Relay Ground CONNECTOR, RelaySWITCH, Kill COLE- HER #90036 TERMINAL, WireTerms and Conditions of Sale Stow Construction Equipment STR46SP Notes Heres HOW to GET Help Your Local Dealer is
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